ban loi bauxit nhân cơ

M U

TP ON CNG NGHIP THAN - KHONG SN VIT NAM================ o ================

BO CO THM DBAUXIT TI KHU VC NHN C, TNH K NNG(Tr lng tnh n ngy 30/04/2011)

H Ni, nm 2011TP ON CNG NGHIP THAN - KHONG SN VIT NAM================ o ================

Tc gi:

KS. Nguyn Xun Ba, KS. L Ngc Giu,KS. on Sinh Huy, KS. V Qu Hip, KS. Thch Qu, KS. o Trung Tn,KS. Phan Thanh, KS. Trn Thip,KS. Nguyn Thanh Tng, KS. Nguyn Nng Thnh,CN. on Minh Nhn, CN. L Th Cm Th,KS. Hong Mnh H, TC. V Duy Quyn,KS. Lu Vn Tm, KS. Nguyn Vn Quang, KS. V Vn Thy, KS. Nguyn Vit Tho, KS. L Vn Thng, KS. Trng Nhn o, KS. Bi Minh Tun

Ch bin:KS.Phm Th Thch

BO CO THM DBAUXIT TI KHU VC NHN C, TNH K NNG(Tr lng tnh n ngy 30/04/2011)

n v u tn v t vn

TP ON CNG NGHIP THAN - KHONG SN VIT NAMCNG TY C PHN A CHT V KHONG SN - VINACOMIN

P.TNG GIM CGIM C

H Ni, nm 2011MC LCMC LC3M U8CHNG 1. KHI QUT V KHU VC THM D101.1. V tr khu thm d101.2. c im a hnh101.3. c im kh hu111.4. c im thy vn111.5. c im giao thng111.6. c im kinh t nhn vn121.7. Lch s nghin cu a cht v khong sn121.7.1. Cng tc nghin cu a cht khu vc121.7.2. Cng tc nghin cu iu tra bauxit131.7.3. nh gi cng tc a cht tin hnh trn din tch thm d14CHNG 2. C IM CU TO A CHT M162.1. c im a cht - khong sn khu vc k Nng162.1.1. a tng162.1.1.1. Gi Mezozoi - h Jura - thng gia - h tng La Ng (J2ln)162.1.1.2. Gi Kainozoi - h Neogen - thng Pliocen - h T - thng Plistocen sm - h tng Tc Trng (N2-Q1tt)162.1.1.3. Gi Kainozoi - h T - thng Pleistocen gia - h tng Xun Lc (Q12xl)172.1.1.4. Gi Kainozoi h T khng phn chia (aQ)172.1.2. Magma xm nhp182.1.2.1. Phc h C N (K2cn)182.1.2.2. Cc ai mch khng phn chia182.1.3. Kin to182.1.4. a mo192.1.5. Khong sn192.1.5.1. Bauxit192.1.5.2. Vng212.1.5.3. Kaolin212.1.5.4. p lt212.1.5.5. Nc khong222.2. c im cu to a cht m222.2.1. a tng222.2.1.1. Gi Kainozoi - h Neogen - thng Pliocen - h T - thng Plistocen sm - h tng Tc Trng (N2-Q1tt)222.2.1.2. Gi Kainozoi h T khng phn chia (aQ)232.2.2. c im v phong ha252.2.2.1. i bazan rn v ( gc)252.2.2.2. i saprolit252.2.2.3. i litoma262.2.2.4. i laterit bauxit262.2.2.5. Lp th nhng272.2.3. c im a mo292.2.3.1. Nhm cc b mt san bng292.2.3.2. Nhm cc b mt sn v vch292.2.4. Cc dng a hnh312.2.4.1. Dng bc mn312.2.4.2. Dng thung lng312.2.4.3. Dng trng lc312.2.4.4. Dng nhn sinh312.3. c im cc thn qung cng nghip332.3.1. c im chung cc thn qung cng nghip332.3.2. c im cc thn qung cng nghip khu Kin Thnh402.3.3. c im cc thn qung cng nghip khu k Sin422.3.4. c im cc thn qung cng nghip khu Nhn C45CHNG 3. CNG TC THM D V VN BO V MI TRNG493.1. Cng tc trc a493.1.1. Nhim v, khi lng v thit b o v493.1.2. Cng tc k thut503.1.2.1. Ti liu gc503.1.2.2. Thnh lp li gii tch II513.1.2.3. Lp ng sn kinh v523.1.2.4. a cng trnh t thit k ra thc a523.1.2.5. Phng tuyn thm d523.1.2.6. o thu cng trnh a cht t thc a vo bn 533.1.2.7. o v mt ct a hnh533.1.3. Cng tc kim tra v nghim thu ti liu533.2. Cng tc lp bn a cht533.2.1. Cng tc lp bn a cht t l 1:5.000533.2.2. Cng tc lp bn a cht t l 1:2.000543.3. Cng tc thm d a cht553.3.1. C s phn chia nhm m, la chn mng li v cng trnh thm d553.3.2. Cng trnh ging thm d563.3.3. Cng trnh khoan thm d573.3.4. Cng trnh ging kim tra khoan613.4. Cng tc ly, gia cng v phn tch mu653.4.1. Ly mu653.4.1.1. Mu rnh ging653.4.1.2. Mu li khoan653.4.1.3. Mu th trng653.4.1.4. Mu xc nh m tn d tinh qung663.4.1.5. Mu c l ht663.4.1.6. Mu nhm tinh qung bauxit663.4.1.7. Mu nhit vi sai v mu Rnghen663.4.1.8. Mu phn tch khong vt bng knh hin vi in t673.4.1.9. Mu cng ngh673.4.2. Gia cng mu683.4.2.1. Mu tinh qung bauxit683.4.2.2. Mu qung nguyn khai bauxit683.4.2.3. Mu c l ht qung683.4.2.4. Mu lt mng v khong vt hin vi in t683.4.3. Phn tch mu743.4.3.1. Mu ho c bn tinh qung743.4.3.2. Mu ho ton din nguyn khai743.4.3.3. Mu ho ton phn tinh qung743.4.3.4. Mu nhit vi sai v mu Rnghen743.4.3.5. Mu lt mng thch hc743.4.3.6. Phn tch plasma743.4.3.7. Hp th nguyn t753.4.3.8. Phn tch khong vt bng knh hin vi in t753.4.3.9. Mu tng cacbon hu c (CHC)753.4.3.10. Mu th trng nh v m753.4.3.11. Mu phn tch m tn d tinh qung753.4.3.12. Mu c l ht qung753.4.3.13. Mu cng ngh753.4.4. Kim tra cng tc mu763.4.4.1. Kim tra cng tc ly mu763.4.3.2. Kim tra cng tc gia cng mu763.4.4.3. Kim tra cng tc phn tch mu ha c bn tinh qung763.5. nh gi chung v cht lng thi cng, tin cy ca cc ti liu793.6. Cc vn bo v mi trng v ti nguyn khong sn80CHNG 4. C IM CHT LNG V TNH CHT CNG NGH QUNG BAUXIT844.1. c dim cht lng qung bauxit nguyn khai844.1.1. c im t nhin ca qung bauxit nguyn khai844.1.2. Thnh phn khong vt qung bauxit nguyn khai844.1.3. Thnh phn ha hc qung bauxit nguyn khai874.1.4. Thnh phn ph v c hi trong qung bauxit nguyn khai884.1.5. Thnh phn nguyn t c ch i km qung bauxit nguyn khai894.1.6. Tnh cht ho l qung bauxit nguyn khai894.1.6.1. pH, Eh trong qung bauxit nguyn khai894.1.6.2. Thnh phn ha c bn theo ht qung bauxit nguyn khai904.1.6.3. Th trng, m t nhin ca qung bauxit nguyn khai934.2. c im cht lng tinh qung bauxit934.2.1. Thnh phn ha hc v thu hi tinh qung bauxit934.2.1.1. Thnh phn ha c bn v thu hi theo mu n934.2.1.2. Thnh phn ha c bn v thu hi theo khi tr lng984.2.2. Thnh phn tp cht ca tinh qung984.2.3. Thnh phn cc nguyn t c ch i km tinh qung984.2.4. m tn d tinh qung994.3. Tnh cht cng ngh qung bauxit994.3.1. Tnh kh tuyn994.3.1.1. Nghin cu thnh phn ht994.3.1.2. Nghin cu ch tuyn ra1034.3.2. Kt qu sn xut th nghim alumin t qung bauxit1094.3.2.1. Mu nghin cu1094.3.2.2. Cng ngh sn xut alumin cng nghip v cc cng on ch yu110CHNG 5. C IM A CHT THY VN - A CHT CNG TRNH V IU KIN K THUT KHAI THC M1145.1. Khi lng cng tc thi cng1145.1.1. o v CTV-CCT t l 1:50001145.1.2. Quan trc n gin CTV - CCT, ging1165.1.3. Mc nc th nghim1165.1.4. Bm nc th nghim1175.1.5. nc th nghim trong ging1185.1.6. Nn sp ct t trong ging1195.1.7. Ly mu nc phn tch thnh phn ha hc v vi sinh1205.1.8. Ly mu t phn tch thnh phn ht v tnh cht c l1215.1.9. Quan trc ng thi nc mt v nc di t (ND)1225.1.10. Thu thp ti liu kh tng thy vn1235.1.11. Chnh l ti liu, vit bo co1235.1.12 i chiu khi lng cng tc thi cng v d kin trong n1315.2. c im CTV - CCT v iu kin khai thc m1325.2.1. c im CTV1325.2.1.1. c im nc mt1325.2.1.2. c im ca nc di t1355.2.2. c im CCT1435.2.2.1. Cc hin tng a cht ng lc cng trnh1435.2.2.2. C l ca cc lp t 1455.2.3. iu kin khai thc m1485.2.3.1. nh gi nh hng ca iu kin t nhin n qu trnh khai thc1485.2.3.2. Tnh gc dc b moong khai thc1495.3. Kt lun151CHNG 6. CNG TC TNH TR LNG1536.1. Ch tiu tnh tr lng1536.2. La chn phng php tnh tr lng1536.2.1. Phng php tnh tr lng1536.2.2. Cng thc tnh tr lng1536.2.3. Xc nh cc thng s tnh tr lng1546.2.3.1. Chiu dy qung1546.2.3.2. Hm lng trung bnh cng trnh khi tnh tr lng1546.2.3.3. thu hi tinh qung cp hat +1mm1556.2.3.4. Th trng trung bnh1556.2.3.5. Tnh din tch1566.2.4. Khoanh ni thn qung bauxit laterit1566.2.5. Khoanh ni thn qung bauxit cng nghip (ranh gii tnh tr lng)1566.2.6. Nguyn tc phn khi tr lng1576.2.7. Nguyn tc xp cp tr lng1576.2.7.1. Cc khi tr lng cp 1211576.2.7.2. Cc khi tr lng cp 1221586.2.7.3. Cc khi ti nguyn cp 3331586.2.8. Kt qu tnh tr lng158CHNG 7. HIU QU CNG TC THM D1747.1. C s tnh chi ph thm d1747.2. Chi ph cho cng tc thm d1747.3. Hiu qu cng tc thm d1757.3.1. Mc s dng vn thm d1757.3.2. Gi thnh thm d175KT LUN184DANH MC TI LIU THAM KHO185DANH MC BN V KM THEO BO CO186DANH MC PH LC KM THEO BO CO187

M UCh trng lp d n bauxit - alumin khu vc Nhn C, tnh k Nng c Th tng Chnh ph thng qua ti Quyt nh s 167/2007/Q-TTg ngy 01 thng 11 nm 2007 v vic ph duyt quy hoch bauxit vi cng sut nh my alumin Nhn C l 600.000 tn/nm. Vic khai thc bauxit ti k Nng c Chnh ph giao cho Tp on Cng nghip Than - Khong sn lm ch u t.Thc hin ch trng ca Th tng Chnh ph, Tp on Cng nghip Than - Khong sn Vit Nam giao cho Lin on Bn a cht Min Trung tin hnh lp n thm d m bauxit khu vc Nhn C, tnh k Nng. Thng 11/2008 Tp on Cng nghip Than - Khong sn trnh B Ti nguyn v Mi trng ph duyt n thm d v c B Ti nguyn v Mi trng cp php thm d M bauxit khu vc Nhn C, tnh k Nng theo giy php s 407/GP-BTNMT ngy 16 thng 3 nm 2009.Tp on Cng nghip Than - Khong sn giao cho Cng ty C phn a cht v Khong sn - Vinacomin t chc trin khai thm d m bauxit khu vc Nhn C, tnh k Nng theo hp ng kinh t s 87/2007/HKT/TKV-GEOSIMCO ngy 26 thng 02 nm 2007.Mc tiu nhim v cng tc thm d.1. Xc nh cu trc m, nghin cu c im a cht cc thn qung bauxit v c im qung cng nghip.2. Xc nh c im a cht thy vn - a cht cng trnh (CTV - CCT) v iu kin khai thc m.3. Nghin cu kh nng tuyn ra, c im cng ngh, cc ch tiu kinh t ho tch alumin t qung bauxit.4. Mc tiu tr lng cp 121+122 l 150 triu tn tinh qung bauxit.Cng tc thi cng thc a c Cng ty C phn a cht v Khong sn - Vinacomin trin khai v hon thnh vo thng 8 nm 2009. Cng tc tng hp ti liu lp bo co ch tiu tm thi tnh tr lng c thc hin t thng 9 nm 2009 n thng 10 nm 2010.Cc phng php v khi lng thc hin bao gm:- Cng tc trc a trn din tch thm d l 286,4 km2.- o v bn a cht - khong sn t l 1:5.000 trn din tch 229,7 km2; o v bn a cht - khong sn t l 1:2.000 trn din tch 56,7 km2.- o v bn CTV - CCT t l 1:5.000 trn din tch 286,4 km2.- Thi cng 5.266 cng trnh thm d, trong c 3.987 cng trnh khoan khi lng l 22.286,90m v 1.599 cng trnh ging vi khi lng l 9.170,3m, ly v gia cng 21.179 mu qung tinh, 1.144 mu qung nguyn khai, 93 mu c l qung. Phn tch 18.956 mu ha c bn tinh qung, 1.144 mu ha c bn qung nguyn khai, 558 mu ha theo thnh phn cp ht, 661 mu ha ton phn tinh qung, 98 mu ha ton phn qung nguyn khai Ly, nghin cu cng ngh tuyn v sn xut alumin theo cng ngh Bayer: 1 mu.Kt qu thm d khoanh nh c 66 thn qung bauxit laterit vi tng tr lng v ti nguyn qung bauxit cp 121+122+333 t: 351.221,27 nghn tn qung nguyn khai, tng ng 127.924,28 nghn tn tinh qung. Tr lng cp 121+122 t 238.883,49 nghn tn qung nguyn khai, tng ng 86.588,68 nghn tn tinh qung, so vi mc tiu n t 57,73%. Cht lng qung tinh p ng yu cu sn xut alumin theo cng ngh Bayer. Bo co c thnh lp theo quy nh ban hnh ti quyt nh s 14/2006/Q-BTNMT ca B Ti nguyn v Mi trng ngy 08 thng 09 nm 2006 Ban hnh Quy nh v trnh t, th tc trnh duyt, thm nh, xt v ph duyt tr lng khong sn trong bo co thm d khong sn.Tham gia lp bo co gm tp th cn b k thut, qun l thuc Cng ty CP a cht v Khong sn v cc nh khoa hc a cht trong nc. Tng kt bo co cng tc a cht gm: KS. Phm Th Thch, KS. on Sinh Huy, KS. Thch Qu, KS. Trn Thip, KS. Phan Thanh, KS. Nguyn Thanh Tng, KS. o Trung Tn, KS. Nguyn Nng Thnh, KS. Nguyn Xun Ba, KS. L Ngc Giu, CN. on Minh Nhn, CN. L Th Cm Th. Tng kt bo co cng tc trc a gm: KS. Hong Mnh H, TC. V Duy Quyn. Tng kt bo co cng tc CTV-CCT gm: KS. Lu Vn Tm, KS. Nguyn Vn Quang, KS. V Vn Thy, KS. Nguyn Vit Tho, KS. L Vn Thng, KS. Trng Nhn o, KS. Bi Minh Tun. Ch bin bo co l KS. Phm Th Thch.Trong qu trnh thi cng thc a v lp bo co tng kt, tp th tc gi nhn c s ch o kp thi v quan tm gip ca Lnh o Tp on Cng nghip Than - Khong sn Vit Nam, Cc a cht v Khong sn Vit Nam, Vn phng Hi ng nh gi Tr lng Khong sn, Cng ty C phn Alumin Nhn C v cc bn b ng nghip, c bit trong thi gian thi cng cn b v cng nhn Cng ty C phn a cht v Khong sn nhn c s ng h tch cc ca Lnh o UBND tnh k Nng, S Cng nghip, S Ti nguyn v Mi trng tnh k Nng v nhn dn a phng khu vc thm d.Tp th tc gi xin by t lng bit n chn thnh n cc tp th, c nhn ng gp nhiu cng sc gip chng ti hon thnh cc nhim v trong qu trnh thi cng v lp bo co thm d ny.CHNG 1. KHI QUT V KHU VC THM D1.1. V tr khu thm dM bauxit khu vc Nhn C c din tch c php thm d l 286,4 km2, gm cc n v hnh chnh: th trn Kin c, x Kin Thnh, x k Sin, x o Ngha, x k Wer, x Qung Tn thuc huyn k RLp v x k RMoan th x Gia Ngha; tnh k Nng. Trung tm m cch th x Gia Ngha 18 km v pha ty nam, cch thnh ph Bun M Thut 130km v pha nam v cch thnh ph H Ch Minh 200km theo ng b, thuc t Bn a hnh Xun Ph (C-48-11-B), B p (C-48-12-A) v Gia Ngha (D-48-96-C) h ta VN 2000, t l 1:50.000. Din tch thm d c khp gc bi cc im ranh gii nh sau: Bng 1-1im gcTa VN-2000

XY

N201.329.410772.495

N211.329.410800.920

N221.321.420800.920

N231.321.420792.420

N241.307.430776.355

N251.307.430765.420

N261.318.420765.420

Din tch khp gc l 510 km2, din tch ny b gii hn bi cc khu vc cm v tm cm hot ng khong sn vi tng din tch l 223,6 km2. Din tch thm d cn li l 286,4 km2.1.2. c im a hnhTheo phn vng a l - a cht, vng cha bauxit k Nng ni chung v m Nhn C ni ring thuc cao nguyn MNng b phn ct tng i mnh, to cc vng an xen gia thung lng, cao nguyn v ni cao. a hnh phn ln c dng i, nh hnh vm, sn thoi, cao trung bnh 400m n 700m. Pha ty khu vc thm d c a hnh thp dn, nghing v pha Bnh Phc. Pha nam l min ng trng c nhiu m h. Cc thn qung bauxit thng phn b dc theo ng phn thy, c hnh dng ko di do s phn ct bc mn ca a hnh. Phn ln din tch khu m thuc t nng nghip nn thm thc vt ch yu l cy cng nghip v cy nng nghip. Din tch vn trng cy lu nin n nh ca dn a phng trong m kh ln.1.3. c im kh huVng k Nng c kh hu nhit i, chia lm 2 ma r rt; ma ma t thng 5 n thng 10, ma kh t thng 11 n thng 4 nm sau. Lng ma trung bnh hng nm t 1.500mm n 2.900mm. Ma kh lng ma khng ng k ch bng khong 20% lng ma trong nm. Nhit trung bnh nm l 23,4oC; thng t nng nht, nhit ln n 39,4oC; thng 12 l thng lnh nht, c khi nhit xung n 7,4oC. Ma kh c nhit trung bnh 18 22oC, dao ng nhit gia ngy v m l 5 - 6oC; hng gi ng bc vi tc 2 - 4m/s, thng 11 v thng 12 tc gi ln n 4m/s. Trong ma ma, lng ma t trn 2.000mm, nhit trung bnh 24 - 28oC, mc dao ng nhit gia ngy v m n 10 - 11oC; gi hng ty nam vi tc 2,5 - 3,0m/s.1.4. c im thy vnTrong din tch thm d, h thng thy vn kh pht trin, nhng ch yu l cc sui nh bc 2, bc 3. Chng chy theo hng chnh Bc - Nam, ng Nam v hp thnh thng lu sng ng Nai. ng k l sui k Nng, k Mil, a Mong, k Yao, k Rtih, k Drung, a Anh Krong, k sin, k Rken, k Keh, k Dsung, k Mua, k Ker, k Rsung, k Rh, k Bukso. Lu lng ca sui k Nng o c ln nht vo thng 7 ti trm TQ36 l 72,49m3/s. Lu lng ca sui k Yao o c nh nht vo thng 4 ti trm TQ23 l 0,22m3/s.Trong khu vc cn c rt nhiu h nh h k Sin (31,9ha), h Cu T (34,7ha), h k Mum (15,3ha), h k Nia (23,7ha), h Snh C (19,3ha), h Tt (29,4ha), h Sui Hai (9,61ha). Cc h ny a s l h nhn to do con ngi chn p ly nc ti tiu.1.5. c im giao thngMng li giao thng ch yu ca tnh k Nng l Quc l 14, on qua tnh k Nng di 155km, c ri nha ton b rt thun li cho giao thng. Quc l ny c mt on chy ngang qua khu vc thm d di 24,7km ni lin tnh k Nng vi cc tnh trong khu vc Ty Nguyn v Thnh ph H Ch Minh. Quc l 14C, on chy qua tnh k Nng di 98km c ri nha, i li thun tin. Quc l 28, on qua tnh k Nng di 58km ni lin t Gia Ngha n Di Linh c ri nha.Ngoi Quc l 14, trong din tch thm d cn c cc ng nh Tnh l 5 (di 30km trong khu vc thm d), Hng l 6 ni lin x o Ngha vi x Nhn C (di 11,7km trong khu vc thm d) v nhiu ng vn chuyn nng sn, xe t c th i li c.Nhn chung mng li giao thng ng b trong tnh k Nng cng nh trong khu vc thm d kh thun tin.1.6. c im kinh t nhn vnTnh k Nng l tnh mi c thnh lp nm 2004, gm 6 huyn:C Jut, k Mil, Krng N, k Song, k Glong, Tuy c v k RLp v th x Gia Ngha. Din tch ton tnh l 6.514km2, dn s tnh k Nng l 489.442 ngi (theo kt qu iu tra ngy 01/04/2009), mt trung bnh 61 ngi/km2, vi cng ng dn c gm 29 dn tc. Trong , dn tc Kinh chim 65,5%, MNng chim 9,7%; cn li cc dn tc khc chim t l nh. S ngi trong tui lao ng l 194.000 ngi, chim 48,5% dn s; trong , s lao ng k thut qua o to chim t l rt nh, khong 13,2%, cn li l lao ng ph thng.Trn a bn tnh k Nng c 1.343 c s sn xut cng nghip, tiu th cng nghip. hnh thnh mt s c s cng nghip ch bin nng - lm sn (6 c s vi 10 nh my sn xut ng, bt sn, tr, thc n gia sc, cn bng v ch bin g). c 11 c s khai thc v ch bin khong sn, vt liu xy dng; 1 nh my in v ang xy dng 3 nh my in khc, cc tuyn ng dy 110KV, 220KV c ni cc trm h th. Cc khu cng nghip v cm cng nghip: Tn Thng (11ha), Nhn C (220ha), k Ha (30ha) ang c xy dng v pht trin. C s h tng x hi nh bnh vin, trng hc cng cc c s tiu th cng nghip ca tnh ang pht trin.1.7. Lch s nghin cu a cht v khong sn1.7.1. Cng tc nghin cu a cht khu vcTrc nm 1975, cc nh a cht Php c cc cng trnh nghin cu a cht bao trm ln khu vc thm d, c th l: E.Saurin (1937, 1964) vi Bn a cht t l 1:500.000, t Si Gn; J. Fromaget (1952) vi t Bn a cht ng Dng, t l 1:2.000.000; H. Fontaine (1971) vi t Bn a cht Vit Nam - Lo - Cam Pu Chia, t l 1:2.000.000. Trong cc cng trnh ny, cc tc gi trn xc nh kh ng n tui ca bazan trong khu vc, nhng cha cp n gi tr cng nghip ca bauxit.Sau nm 1975, on 500 thuc Tng cc a cht, trong cc cng trnh chnh l bn a cht t l 1:500.000 (1976 - 1980), chnh l bn a cht Min Nam Vit Nam (1983), nh gi bauxit trong vng c tr lng ln, cht lng tng i tt.Nm 1989, khu vc nghin cu c o v a cht t l 1:200.000 trong nhm t Bn Kh - ng Nai do Nguyn c Thng lm ch bin.Trong nhng nm 1985 - 1991, khu vc nghin cu nm trong phm vi c tin hnh kho st a cht, a mo, v phong ho, t l 1:50.000, cc vng: Qung Sn, 1-5, k Song, Tuy c, Gia Ngha, Bc Gia Ngha, Nhn C, o Ngha v nghin cu kh chi tit cc thnh to bazan N2 - Q1 lin quan vic to v bauxit laterit.Ngoi ra, cn cc cng tc nghin cu v cc vn khc nh: a cht thu vn (Trn Hng Ph, 1978-1983), a mo (L c An, 1980-1982), v phong ho (Nguyn Thnh Vn, 1980-1982) t l 1:500.000, tin hnh trn ton Min Nam Vit Nam, phn chia cc phc h cha nc, cc thnh h v phong ho c trng lin quan vi cc khong sn quan trng nh bauxit, kaolin... v phn chia cc n v cu trc hnh thi cp I. l nhng cng trnh cung cp nhng thng tin c gi tr nh hng cho cng tc iu tra khong sn.1.7.2. Cng tc nghin cu iu tra bauxitNm 1963, J. Smith l ngi u tin nghin cu v bauxit Nam Vit Nam. ng tin hnh mt s hnh trnh cao nguyn MNng v pht hin cc mu bauxit cch Qung Sn 7 km v pha ng vi hm lng trung bnh Al2O3: 45%, SiO2: 2,5%. iu ny c BRGM (Php) cng khng nh s tn ti ca bauxit trn cao nguyn MNng (1964).Nm 1969, U Ban sng M Kng d bo c th tn ti cc thnh to cha bauxit Plei Ku, k Lk v phn bc cao nguyn MNng thuc phn Ty Nguyn, Vit Nam.Nm 1974, Berange, trn c s phn tch ti liu hin c ti Nha a cht Si Gn, kin ngh tip tc nghin cu, tm kim bauxit Nam Vit Nam.Nm 1979, mt trong nhng kt qu quan trng ca cng trnh chnh bin Bn a cht 1:500.000 (ca Nguyn Xun Bao, L Thc Xinh) bc u khoanh nh din pht trin v phong ho laterit, vch ra c tin tm kim bauxit v nhn mnh trin vng to ln ca bauxit Nam Vit Nam.Trong thi gian t 1979 n 1992, c bit l sau nm 1982, Tng cc a cht phi hp vi cc chuyn gia khi SEV y mnh cng tc nghin cu, tm kim v thm d trn cc vng d bo c trin vng pht hin bauxit laterit. l cc cng trnh: - Tm kim nh gi bauxit laterit Nam Vit Nam (Lxov Iu.M, 1986).- Tm kim nh gi bauxit m rng khu Nhn C, Gia Ngha, k Nng, k Lk (Trn Hiu Sinh, 1988).- Thm d t m m bauxit 1-5 (Sibistov B.V, Phm nh Hin, 1990).- Tm kim nh gi m bauxit laterit o Ngha v Bc Gia Ngha, tnh k Lk, t l 1:10.000 (Phm nh Hin v n.n.k, 1992).Cc cng trnh trn nghin cu kh chi tit v khoanh c din phn b cc thnh to bazan N2 - Q1 lin quan to v bauxit laterit; xc nh cc thn qung bauxit v d tnh tr lng qung nguyn khai, tinh qung ti cc m tm kim, thm d.Ngoi cc cng trnh trn, trong giai on ny cn c nhiu nghin cu chuyn lin quan n bauxit khu vc k Nng v Nam Vit Nam nh: nghin cu thnh phn vt cht, quy lut phn b, phn vng v d bo bauxit laterit Nam Vit Nam (L Vn Tro, V Ngc Hi, Phm Gia Mn); nghin cu thnh phn vt cht qung bauxit (Phm Vn An, Nguyn Th Gio, Trn Khnh Hng); nghin cu v phong ho v bauxit (ng Trung Thun, Nguyn Ngc Trng, Nguyn Thnh Vn, Nguyn Tin Tn, Trn Quang Tnh).1.7.3. nh gi cng tc a cht tin hnh trn din tch thm dTrn din tch thm d ca m bauxit Nhn C tng tri qua hai giai on iu tra a cht - khong sn c ngha:Giai on 1, t nm 1984 n 1988: Trong giai on ny tin hnh cng tc Tm kim nh gi bauxit m rng khu Nhn C - Gia Ngha, vng k Nng - k Lk. Cng trnh thi cng l ho v ging, c b tr trn cc nh cao ca i hay sng i. Mt cng trnh 1 2 cng trnh/km2. Hu ht cc cng trnh u tp trung ven ng quc l, tnh l. Vic khoanh ranh gii thn qung bauxit ch yu c d on trn nn a hnh 1:50.000 h UTM. Cc tc gi d bo tr lng cp C2+P1 cho tng m, nhng trn bn cha bao qut tng th, phn chia r rng ranh gii cc m. xy ra s trng lp, chng ln v b st.Giai on 2, t nm 1988 n 1991: Tin hnh cng tc Tm kim nh gi m bauxit laterit o Ngha v Bc Gia Ngha, tnh k Lk. Cng trnh thi cng l ho v ging, c b tr theo mng li 800 x 800m. C s a hnh l Bn a hnh xy dng bng phng php nh hng khng, t l 1:10.000, cc cng trnh c o ta . Cc tc gi d bo tr lng cp C2 + P1. nh gi chung v cc cng tc tin hnh:Cng tc nh gi qung bauxit trn din tch thm d cha c tin hnh ng b, cht ch, mt s cng trnh trong qu trnh thi cng b tr cha hp l. Cc phng php thi cng v mt cng trnh cha nh gi trit tr lng qung bauxit cp C2 + P1; c din tch tnh ton trng lp, nhiu din tch b st khng tnh d bo.

S v tr giao thng Nhn C

CHNG 2. C IM CU TO A CHT M2.1. c im a cht - khong sn khu vc k NngKhu vc k Nng c din tch khong 5.500km2. Ti y cng tc o v lp bn a cht chun Quc gia mi dng t l 1:200.000. Theo kt qu o v Bn a cht t l 1:200.000 nhm t Bn Kh - ng Nai, khu vc k Nng l mt b phn ca i Lt, thuc ra Ty Bc. Chim phn ln din tch l trong khu vc l cc thnh to phun tro bazan h tng Tc Trng, chng ph trm ln cc thnh to h tng La Ng, phc h magma C N. Bn thn chng li b cc thnh to h tng Xun Lc, thnh to b ri h T ph trm ln mt vi din tch nh. (Bn v s 5)2.1.1. a tng2.1.1.1. Gi Mezozoi - h Jura - thng gia - h tng La Ng (J2ln) Cc thnh to h tng La Ng l cc c nht trong vng, phn ln b phun tro bazan bao ph, chng l ra vi din tch ng k cc khu vc C KNia, Dak Buk Sor, Nam , Nam Nung, c Xuyn, Qung Sn, k RMang, phn pha Bc, ng v ng Nam th x Gia Ngha. Ngoi ra cn l ri rc di dng ca s nhng ni tng ph bazan b bc mn. Thnh phn h tng gm cc phn chuyn tip ln nhau: Di cng l bt kt mu xm en dng phn di v st kt mu en, xen cc lp mng ct kt, ct bt kt, bt kt mu xm en, c cha di tch thc vt. Phn gia gm bt kt phn lp mng, xen phin st v lp mng st kt mu en c vy mica dng sc di. Trong bt kt c cha vn thc vt. Phn trn ct kt ht va n mn mu xm, xen bt kt mu xm, ct bt kt mu vng, v lp mng st kt mu en v ct kt mu xm. Mt khc chng b xm nhp phc h C N- tui Krta mun xuyn ct qua gy bin cht tip xc vi mc khc nhau. nhng ni gn khi xm nhp kch thc ln thng gp bin cht cao tng sng hornblend, v xa hn thng gp bin cht thp nh sericit ho, sng ho. H tng La Ng c nh tui Jura gia. Chiu dy h tng t 700 - 800m.2.1.1.2. Gi Kainozoi - h Neogen - thng Pliocen - h T - thng Plistocen sm - h tng Tc Trng (N2-Q1tt) phun tro bazan h tng Tc Trng (N2-Q1tt), bao gm phn ln trng bazan k Nng v cc din ph nh v ri rc to nn a hnh dng vm ph cao khong 700m tr ln. Thnh phn ch yu l bazan olivin kim, bazan olivin-augit, bazan olivin - augit - plagioclas, bazan olivin - plagioclase, nhn chung cc bazan thuc h tng thng c dng vi ht hoc n tinh, mu sc t xm, xm en n en. c cu to khi t st hoc l hng, hnh nhn. Kin trc ph bin l porphyr vi nn dolerit, gian phin. Phn di ph bin l bazan olivin, bazan olivin - augit, bazan olivin - augit - plagioclas, phn trn b phong ho hon ton thnh t mu . B dy 70-80m Phn gia l bazan 2 pyroxen, bazan olivin - augit - plagioclas, plagioclabazan, bazan olivin. Chiu dy 90-140m. Trn cng l bazan plagioclas, bazan olivin - augit-plagioclas, bazan olivin - augit, phn trn phong ha thnh t c cha kt vn laterit, nhiu ni c cha bauxit laterit. Gm cc i t di ln: i bazan phong ho d dang, nt n dng cu, c chiu dy t 4-5m. Tip theo l i st, st loang l (litoma) c cc kt vn laterit, dy khong 25-30m. Chuyn ln trn l i st c cha laterit bauxit, vi chiu dy t 5-15m. V trn cng l lp th nhng, chiu dy khong 1-2m. Bazan h tng Tc Trng ph trc tip trn b mt bo mn ca h tng La Ng, vi s ngn cch bng mt b mt phong ho mng. Da vo quan h a cht h tng Tc Trng c xp vo Pliocen - Pleistocen.2.1.1.3. Gi Kainozoi - h T - thng Pleistocen gia - h tng Xun Lc (Q12xl)H tng Xun Lc gm cc bazan l ra tp trung khu vc k Mil, v Bun Choah, gn b cht ch vi cu trc ni la di dng vm ph nm khng khp ln trn b mt bo mn cc thnh to h tng La Ng v bazan h tng Tc Trng c trc. Ngoi cc phun tro di dng dng chy, cn mt khi lng cc vn tuf ni la. Cc thnh to ny gm hai phn: di cng l tro ni la mu xm nu n en, i ni c tuf xen vi cc lp bazan olivin - augit, bazan olivin - augit - plagioclas, cu to l hng; phn trn l bazan olivin, bazan dolerit, plagiobazan v bazan olivin mu en, lc xm, t hn l dm tuf, bom v x ni la. Bazan ny khi phong ho thng to nn lp v laterit st cng chc; b dy 100-120m.Bazan h tng Xun Lc y ph trc tip trn bazan h tng Tc Trng v b ph bi cc bi tch Holocen; do h tng Xun Lc c xp vo Pleistocen trung.2.1.1.4. Gi Kainozoi h T khng phn chia (aQ)Din phn b cc thnh to h T khng phn chia thng tp trung trong lu vc cc sui v m ly trong khu vc.Cc trm tch sng thng Holocen, ph thng trung - thng (aQ22-3): Phn b di dng cc tch t b ri ven phn cao sng Eakrng to thnh thm bc I, c cao t 6-10m. Thnh phn gm st ct, st bt mu loang l v kt vn laterit. Chiu dy 5-6m.Cc trm tch sng - m ly thng Holocen, ph thng trung - thng (abQ22-3): Phn b dc cc thung lng sng EaKrng v cc sui ln, m ly trong vng. Thnh phn l ct, bt, st, i ch c than bn, st than. Chiu dy 2-3m.Cc trm tch sng thng Holocen, ph thng thng (aQ23): Thng to nn cc bi ct ven lng hoc bi bi, pht trin dc theo cc sui trong vng. Vi thnh phn kh a dng gm cui cc loi: Cui thch anh, ct kt, granit, phun tro,... Chiu dy t 1-2m.2.1.2. Magma xm nhp2.1.2.1. Phc h C N (K2cn) Cc thnh to xm nhp phc h C N ch l ra k Song v mt vi khi nh phn b ri rc, c din tch 170km2, gm hai pha xm nhp chnh.Pha 1 (K2cn1): Chim hu ht khi k Song, bao gm granit biotit giu thch anh c muscovit, granit hai mica ht va n th sng mu, cu to khi, kin trc porphyr. Thnh phn khong vt gm: plagioclas 15-25%, felspat kali 35-45%, thch anh 30-40%, biotit 3-6%, muscovit 0-3%. Khong vt ph c zircon, apatit, granat, turmalin, Kin trc t hnh, na t hnh, porphyr. Pha 2 (K2cn2): L ra thnh khi nh pha ng bc vi din tch khong 9-10 km2 v cc khi nh nm ra pha ty khi k Song. Vi thnh phn khi gm granit hai mica, granit alaskit, granit granophyr. sng mu ht nh, cu to khi, kin trc porphyr. Thnh phn khong vt gm: plagioclas 17-24%, felspat kali 41-52%, thch anh 36-40%, biotit 2-3%, muscovit 2-5%. Khong vt ph c zircon, apatit, sphen, granat, turmalin v fluorit.Cc thuc phc h C N xuyn ct v gy bin cht sng ho mnh m cc thnh to h tng La Ng ra tip xc, c lin quan n cc biu hin khong sn vng...2.1.2.2. Cc ai mch khng phn chiaGm cc ai mch thch anh (q), pegmatit (p), lamprophyr (l)... Chng c dng mch hoc thu knh nh c kch thc 1-5m, phn b ri rc hoc tp trung dc theo cc t gy xuyn theo hoc ct lp t h tng La Ng, trong chng thng c khong ho sulfur i km.2.1.3. Kin toTrong khu vc c 2 h thng t gy chnh nh sau:- H thng t gy phng ng bc - ty namt gy Qung Tn - c Mnh: Nm khu vc ty bc vng, ko di t Qung Tn n c Mnh, di trn 60km v cn tip tc pht trin ra ngoi din tch c hai pha. t gy c mt trt nghing v ty bc gc dc 80-850. Phn ln t gy b che khut di tng ph bazan. Cnh ty bc ca t gy l cnh st v cnh ng nam l cnh nng.t gy k H - Qung Sn: Nm khu vc ng nam ca vng, ko di trn 64km v cn tip tc pht trin ra ngoi c hai pha, chia ct gy dch chuyn dng trt bng phi trong cc trm tch h tng La Ng. t gy c mt trt nghing v ty bc gc dc 75-800. Cc t gy ko theo dng bc thang m rng i dp v hng trm mt.- H thng t gy phng ty bc - ng namt gy k Nng - k Mil: Ko di trn 45km c mt trt dc 75-800, nghing v ty nam vi cnh ty nam st v cnh ng bc nng. Chnh iu ny lm cho a hnh c tnh cht dng phn bc t ty nam n ng bc.2.1.4. a moKhu vc k Nng c cu trc b mt a hnh dng cao nguyn nghing dn v pha nam, ty nam. cao tuyt i tng dn t pha ty nam 500m ln ng bc 950-1000m. Mng li sui chng cht, chia cao nguyn thnh nhng khu vc ni i st vi cao tng i ca nh 40 -180m. Trn bnh chng c dng "a mip" sn nhn chung khng i xng, thng li; ch dc ti 10-12o. Thung lng sui thng c dng ch "V", phn ct 1,5- 2,8km/km2. Vi c im a hnh trn, c th phn chia thnh nhng n v a mo sau:- Cc b mt a hnh dng vm ph: Phn b bao trm khu vc ty nam pht trin trn cc cao nguyn bazan c tui khc nhau cao t 500-1000m. B mt a hnh b bin i t nhiu do qu trnh ngoi sinh thng to ra cc b mt rng, sn thoi, sui dng to tia thot nc d dng. - Cc b mt a hnh xm thc bc mn: Phn b khu vc pha ng v ng nam vng nghin cu, pht trin trn cc loi khc nhau k c bazan. B mt a hnh c dng i, ni thp ko di. Thng to nn dng dng chy, l cc sui, khe rnh. - Cc b mt a hnh bc mn tch t: L a hnh tng i bng phng, cao khong 250-300m. Vi dng a hnh ln sng thoi, sn dc 5-100. Phn b dc sn theo cc sui ln.- a hnh tch t: Pht trin dc theo cc thung lng sui, to cc thm bc I-II, rng hng trm mt, cao vi mt. Thnh phn l ct, cui si, st. 2.1.5. Khong sn2.1.5.1. BauxitNm 1986, trong "Bo co tm kim nh gi bauxit laterit Nam Vit Nam", tc gi Lxov Iu.M v Nguyn Thanh Chu nh gi tr lng cc m trn cp C2 + P1 l 1.412.838 nghn tn tinh qung. Nm 1990, qu trnh tng hp kt qu t cng tc thm d M bauxit 1-5, tm kim m rng M Qung Sn v tm kim nh gi bauxit khu Nhn C, Gia Ngha, Bc Gia Ngha, o Ngha; Sibistov B.V, Phm nh Hin, Trng Hu Sinh, Nguyn Tng Tri v.v... a ra tng tr lng tinh qung bauxit cc m trn cp C2 + P1 l 461.000 nghn tn.n nay, khu vc k Nng c 7 m bauxit c kho st v nh gi tr lng: 1-5, Qung Sn, Nhn C, o Ngha, Gia Ngha, Tuy c v k Song. Tt c qung cc m ny u l dng bauxit laterit phong ho t bazan h tng Tc Trng.- M bauxit 1-5: Thuc x Qung Sn, huyn k Glong, tnh k Nng. M c thm d t m vo nhng nm 1987 - 1990. Tng khi lng thi cng: 1401 ging/9973m, ly v phn tch mu rnh cng trnh 9.444 mu. Din tch cha qung 30,72km2, chiu dy qung trung bnh 4,6 m, thu hi tinh qung 43,3%. Tr lng tinh qung l: 97,345 triu tn (1990).- M bauxit Qung Sn: Thuc x Qung Sn, cch m bauxit 1-5 chng 2 km v pha ng. Din tch cha qung 28km2, chiu dy trung bnh 3,3 m; thu hi tinh qung 41%. Tr lng tinh qung 60,6 triu tn (1990).- M bauxit Nhn C: Thuc x Nhn C, huyn k R'Lp, tnh k Nng; cch th x Gia Ngha chng 7km v pha ty. Din tch cha qung 17,2km2, chiu dy trung bnh 2,8m; thu hi tinh qung trung bnh 41%. Tr lng tinh qung l 31,9 triu tn (nm 1990).- M bauxit Gia Ngha: Thuc x Trng Xun, huyn k GLong, tnh k Nng; cch th x Gia Ngha chng 4km v pha ng bc. Din tch cha qung 22,5km2, chiu dy trung bnh 2,7m; thu hi 41%. Tr lng tinh qung 39,9 triu tn (nm 1990).- M bauxit Bc Gia Ngha: Thuc x k Song, huyn k Song; cch th x Gia Ngha chng 40km v pha ty bc. Din tch cha qung l 44,6km2, chiu dy trung bnh 5,2m; thu hi 41%. Tr lng tinh qung 60 triu tn (nm 1990).- M bauxit k Song: Thuc x k Song, huyn k Song, cch m Bc Gia Ngha chng 3km v pha ty bc. Din tch cha qung 29,3km2, chiu dy trung bnh 3,1m; thu hi 41%. Tr lng qung tinh 59,5 triu tn (1990).- M bauxit Tuy c: Thuc x k Buk S, huyn k R'Lp, cch th trn Kin c 35km v pha ty bc. Din tch cha qung 32,2km2, chiu dy trung bnh 3,3m; thu hi 41%. Tr lng qung tinh 68,3 triu tn (1990).- M bauxit o Ngha: Thuc x o Ngha, huyn k R'Lp, cch th trn Kin c chng 6km v pha nam. Din tch cha qung 90,9km2, chiu dy trung bnh 4,4m; thu hi 41%. Tr lng qung tinh 40 triu tn (1990).Qua nghin cu ti liu, chng ti thy rng: vic nh gi tr lng ca Lxov Iu.M v Nguyn Thanh Chu (1986) c tin cy cao hn. Cc tc gi nh gi tr lng ca tng m c da trn nhng cng trnh c th phn trung tm v ngoi suy ra ra xung quanh. Tc gi Sibistov B.V, Phm nh Hin v nhng ngi khc (1990) da trn kt qu thm d M 1-5 so snh vi kt qu tm kim trc y v suy ra tr lng cc m cn li, cha c thm d. Vic suy din ny cn mang tnh ch quan.2.1.5.2. Vng- im qung vng gc k Ha: Nm trn a phn x Qung Sn, huyn k GLong. C ta : 107004'47'' kinh ng; 12013'30'' v bc. im qung bao gm tp hp cc mch, thu knh thch anh sulphur - vng, c b dy 0,8-1m, chiu di t 50-140m, th nm 250o50o. Khong vt qung pyrit, chalcopyrit v vng. Hm lng Au: 1,2-1,8g/t. Cng tc nghin cu mc kho st s b.- Vng sa khong k Mong: Dc theo sui k Mong vng tn ti trong cc trm tch b ri thuc thm bc I, bi bi v trm tch lng. Vng, tp trung lp cui si ht th, chiu dy thay i 0,1-1m. Trong mu i trng sa gp vng t 10-25 ht. Ht vng c kch thc 0,1-5mm, dng tm, que. Dn v ang khai thc ri rc.2.1.5.3. Kaolin Kaolin k Ha: Thuc x k Ha, huyn k GLong, tnh k Nng, cch th x Gia Ngha khong 15 km. n "nh gi trin vng kaolin v cc khong sn khc vng k Ha, Khim c, tnh k Nng, ang c on a cht 506 Lin on a cht Trung Trung B thi cng. Kaolin l sn phm phong ho ca phin giu felspat thuc h tngLa Ng. Tng sn phm st kaolin, c chiu dy t 3 >4 m. St kaolin ht 0,002mm chim > 37,8 %; ch s do 14 %; gii hn chy trung bnh 39 %. Thnh phn ho hc ca kaolin gm (%): SiO2: 61,266,96; Al2O3: 19,9124,69; TiO2: 0,06; Fe2O3: 1,61,68; MgO: 0,61,61; CaO: 0,421,75; Na2O: 0,16; K2O: 3,55 3,73; SO3 < 0,01.2.1.5.4. p ltBazan tr k Nia: Nm trn a phn thn 9, x k Nia, huyn k GLong, c ta HN - 72: X = 1.324.264m; Y = 772.241m. y l loi c cu to hnh lng tr, c gi tr trong mt s lnh vc xy dng v trang tr theo dng khi t nhin, hin ang c th trng trong v ngoi nc quan tm. Gn y, Lin on a cht Trung Trung B kho st im ny. bazan hnh lng tr l ra trn din tch 500 x 300m2. ng knh cc tr ph bin t 0,4-0,6m; i khi t n 0,8m; chiu di >5m. Bazan olivin mu en, p, cu to khi c xt, kin trc ban trng. Thnh phn gm: plagioclas 70%; pyroxen 25%; olivin t ht nh; qung 5%. c tnh c l : dung trng 2,84g/cm3, t trng 2,91g/cm3, rng 2,08%; ht nc 0,56%; cng nn 1240kg/cm2; cng khng nn 1180kg/cm2; h s mm ho 0,95. bng sn phm c th t >70- 80%.Ti nguyn d bo cp P2 = 13km2 x 2890 tr/km2 =37.570 tr bazan.2.1.5.5. Nc khongim nc khong cacbonic, thuc x k Mol, huyn k Mil. Ti l khoan s 809 ca on a cht 701, su 128 m gp nc khong nng. Nc c p lc phun cao trn mt t trn 18 m, lu lng 25 l/s; bo ho kh CO2. Tr lng nc khong d bo 840 m3/ ngy, kh CO2 l 9,5 t/ngy.2.2. c im cu to a cht m2.2.1. a tngKt qu o v lp bn a cht khu m cho thy, khu vc thm d phn b ch yu l thnh to phun tro bazan h tng Tc Trng (N2-Q1tt), chim din tch t hn l cc trm tch b ri h t phn b dc theo thung lng sui k RRung, k Buk So, k Drung, k Tih, k Zih, k RKeh, k Anh Kng, k Nng.2.2.1.1. Gi Kainozoi - h Neogen - thng Pliocen - h T - thng Plistocen sm - h tng Tc Trng (N2-Q1tt) phun tro bazan h tng Tc Trng (N2 - Q1tt) chim phn ln trong tng din tch thm d khu Nhn C. Chng to nn a hnh dng vm ph c cao tuyt i t 540 - 740m. bazan gc ch l lng sui v cc trng a hnh thp, bazan ca h tng ny b phong ha mnh to lp v phong ha dy c cha qung bauxit laterit phn b trn nh v sn i. Thnh phn thch hc theo kt qu phn tch 62 mu cho thy c 2 loi bazan: bazan olivin cu to khi c xt xen bazan l hng. bazan olivin mu xm en; ht mn; cu to khi c xt; kin trc ni ban nn vi ofit. Kt qu phn tch 52 mu thch hc chi tit cho thnh phn khong vt nh sau: cc khong vt ban tinh chim 5-37% trong : olivin 3-20%; pyroxen 0-12%; plagioclas 0-14%, cc khong vt nn chim 63-95% trong : plagioclas 12-54%; pyroxen 20-37%; qung v thy tinh 0-12%; olivin 0-20%. bazan l hng mu xm en, xm sm c cu to l hng, kin trc khm ofit, vi ofit, gian phin. Kt qu phn tch 10 mu thch hc chi tit cho thnh phn khong vt gm: Plagioclas 39-54%; pyroxen 21-40%; olivin it-10%; qung v thy tinh 7-32%Thnh phn ha hc ca bazan theo kt qu phn tch mu ha sili ct trong : SiO2 46-54,24%; TiO2 1,48-2,00%; Al2O3 14,16-15,92%; Fe2O3 1,73-6,48%; FeO 4,41-10,76%; MnO 0,07-0,21%; MgO 4,25-8,50%; CaO 7,24-13,81; Na2O 1,65-3,32%; K2O 0,25-1,56%; P2O5 0,11-0,32%; MKN 0-6,43%; SO3 0-0,26%; tng kim Na2O + K2O 2,32-4,74%.Kt qu trn cho thy bazan trong vng c trng cho kiu bazan kim.Hm lng cc nguyn t theo kt qu phn tch mu quang ph bn nh lng nh sau: Ca 0,1-3%; Ba vt-0,05%; Fe 5-7%; V 0,02%; Mn 0,03-0,07%; Ti 0,2-1%; Co 0,001-0,002%; Ni 0,005-0,01%; Cr 0,01-0,02%; Mo 0,0002-0,0005%; Sn 0,0003-0,0005%; Cu 0,005-0,01%; Ag vt-0,00002%; Pb 0,0005-0,015%; Zn 0,003-0,01%; Ga 0,001- 0,002%; Nb vt-0,001%; Zr 0,0005-0,007%; Na 0,5-2%; Y vt-0,005%; Yb vt-0,0001%; Sc vt-0,0005%.2.2.1.2. Gi Kainozoi h T khng phn chia (aQ)* Trm tch aluvi sng tng thm bc II (aQ1 2-3)Trm tch aluvi thm II l ra thung lng sui ln nh ak Tih, k RKeh. Khu vc ny c nng v b bc mn xm thc mnh trn v phong ha bazan, chiu cao tng i 7-10m. Mt ct trm tch t trn xung ti thung lng sng ak Tih.+ Mt ct im kho st NC.3681- Lp ph bt st b ri mu nu dy 2m, b mt sn tng i bng, thc vt ch yu l cy bi rm.- Lp cui si dm sn dy 2-2,5m. Thnh phn cui, si v dm sn laterit bauxit ng knh 1-3cm, mi trn trung bnh, cui thch anh mi trn kh tt ng knh 0,5-2,0cm; T l cui, si, dm, sn chim khong 20-25%.- Lp v phong ha bazan c thnh phn bt st mu nu pht tm ln mnh dm bazan phong ha.+ Mt ct im kho st NC.3843- Lp bt st b ri mu nu dy 0,7m.- Lp cui si, dm sn dy 1,2m. Cui si c thnh phn laterit bauxit, bazan, t thch anh; kch thc 2-3cm n 6-7cm; mi trn trung bnh.+ Mt ct ti im kho st NC.20644- Lp ct bt mu xm vng dy 1,5m, gn kt yu, b ri.- Lp cui sn si ln bt dy 1,5-2,5m. Cui sn si thnh phn thch anh, bazan, laterit; chn lc v mi trn tt; gn kt yu.+ Mt ct ti im kho st NC.20693- Lp bt st mu nu vng cha sn si laterit v t mnh thch anh, b ri, dy 1m.- Lp cui, sn, si ln bt nu . Cui, sn, si c thnh phn l laterit bauxit, bazan v thch anh, t tectit. Cui, si kch thc 1-2cm, trn cnh chim 30%. Cui si kch thc 0,2-0,7cm, trn cnh chim 30%. Chiu dy lp 3m.- Lp bazan phong ha d dang to lp bt mu nu , nu vng dng bc v hnh cu, phn nhn cn ti l bazan cu to khi c xt, mu xm. thung lng sui k RKeh, khu o Ngha ch quan st c lp cui si a thnh phn gm laterit bauxit, bazan, thch anh mi trn trung bnh xen ln bt st mu nu , vng, gn kt yu (.51239-51240; .51113-.51116, ).V tui cc trm tch thm ny c xc nh trn c s so snh cao, s c mt ca cui trm tch, bazan v t thch anh.* Trm tch aluvi sng tng thm bc I (aQ1 2-3)Cc trm tch aluvi cu to nn thm I cao 5-6m, phn b hn ch cc khu vc thung lng sui k RKeh, sui k Tih, sui K Nng.Trm tch aluvi thm bc 1 ti thung lng sui k Tih (NC.3927-NC.3928): Thm cao 3-4m so vi lng sui, rng 100m; b mt hi nghing thoi v lng sui. Thnh phn gm st bt b ri mu sm, nu en. thung lng k RKeh, khu vc o Ngha, din phn b khong 2km2. Thm c cao t 5,0 - 6,0m, ko di khong 500m. Thm I c bo tn tt. Mt ct trm tch aluvi thm I t trn xung nh sau:- Lp ph mu nu xen ln r cy v r tranh dy 0,5m.- Lp bt st mau xam vang n xam pht nu dy 3,5m.- Lp cui si trn cnh a thnh phn, gm cui, cat, bt kt, set kt, cui soi bazan ln it cui thach anh....gn kt cht, dy 0,8m.* Trm tch aluvi sng tng bi bi cao (aQ2 1-2) Trm tch aluvi tng bi bi cao phn b thnh nhng di nh hp dc theo thung lng sui k Tih, k Drung, k Yao, k RKeh, k Anh Kng, k Rsung, k Nng. Thnh to c chiu rng vi chc mt n 100-200m, chiu di 50m n 200-300m; chiu cao tng i so vi lng sui t 1m n 2m. Thnh phn ch yu l bt st mu xm, xm nu ln sn si laterit, bazan.Mt ct trm tch ti thung lng k RKer, khu vc x o Ngha t trn xung nh sau:- Lp ct st ln si b ri b dy 1,0-2,0m.- Lp cui, tng, ct, bt dy 0,5-1,0m.* Trm tch aluvi sng tng lng v bi bi thp (aQ2 2-3)Trm tch phn b theo cc sng sui, dng chy thng xuyn, cao tng i 0,0-1,2m, chiu dy trm tch 0,5-1,2m. Thnh phn trm tch l ct, sn, cui, tng a thnh phn. Chiu dy trm tch thng khng n nh, ma ma ngp nc, snh ly, ma kh th to nn cc doi, g nh cao, thc vt pht trin ch yu l c di. cc sui nhnh pht trin ch yu tch t aluvi tng lng, tng bi bi thp phn b hn ch hn. Lng hin i sui cp I, II, c cu to bi vt liu mn, xen ln ct, tng bazan.* Trm tch deluvi h t khng phn chia (dQ)Cc trm tch deluvi l ra ba din tch nh hp pha bc v pha nam khu Nhn C. Chng phn b cc sn dng lm, vng cung, ni tip gip vi thung lng v nhng ni sn c dc nh. Thnh phn vt cht ch yu l cc sn phm deluvi v mt phn l proluvi. Thnh to deluvi c chiu dy khng ng u. nhng vng qu trnh ra tri chim u th th vt liu kh mn gm bt st, xen ln bn di la cac tang ln ln cui, soi laterit. Mt ct trm tch deluvi quan st ti ging T2-GKT35 (pha bc khu m bauxit Nhn C) t trn xung nh sau:- Lp ph mu vng nht dy 0,3m thnh phn bt st ln r cy.- Lp laterit st mu nu dng si nh kch thc 0,3-1cm ln bt st, dy 0,8m. - Lp laterit st mu nu dng kt vn gn kt kh rn chc, dy 1,4m.- Lp laterit st mu nu , dng ht trn cnh, kch thc 0,3-1,5cm ln st mu nu xm, nu en, chiu dy 2m.- Lp st mu nu , xm tm, mm do, dy 0,8m.2.2.2. c im v phong haDi tc dng ca kh hu nng m nhit i, vi lng ma ko di nhiu thng trong nm. Cng vi iu kin a hnh thun li, cc bazan phn b phn a hnh bc cao t 550m tr ln b phong ha mnh m, c chiu dy trung bnh 4-5m, c ch t trn 15m. Trong v phong ha cha tng sn phm laterit bauxit kh tt vi b dy thay i trung bnh t 1-2m n 10m vi c tnh dy phn nh v gim dn sn i. y l i tng thm d.V phong ho laterit trong vng l cc sn phm c hnh thnh t qu trnh phong ha ti ch bazan h tng Tc Trng. V phong ha c tnh phn i ng, c th chia ra 5 i, bao gm: i bazan rn v, i saprolit (bazan phong ha yu), i litoma (st loang l), i laterit cha bauxit v i th nhng.Mt ct thng ng ca v phong ha trong khu m c phn i kh r nh sau (t di ln trn):2.2.2.1. i bazan rn v ( gc)i bazan rn v c mu xanh, xm xanh, xm en. Thnh phn khong vt ca bazan gm plagioclas, pyroxen, olivine Theo cc khe nt trong khi bazan, tc dng ca nc v cc oxyt thnh to mt s khong vt kaolinit, halozit, i khi l cc khong vt st. Chng to thnh nhng lp mng mng mu en dng r st, d bp vn. Mt vi ni gp cc khong vt opal, silic, khong vt carbonat, thch anh; chng lp y nhng khe nt v nhng l hng. 2.2.2.2. i saproliti saprolit c mu xanh, xm vng, cu to v ng tm gm cc khi st cc nhn bazan cn ti mt phn plagioclas v mt phn thy tinh ni la c thay th bng polit (ch yu l st), c nhng l hng c lp y bng hydroxit st v nh hnh. Trong st, plagioclas c thay th bng kaolinit v gtit. Nhng khe nt v l hng c thay th bng oxyt silic ngm nc b bao quanh bi gtit v kaolinit. i saprolit cn gi c rt r cu trc tn d ca bazan, t nhn bazan ra ngoi ra hm lng oxyt silic gim r rt, cc nguyn t kim th v kim b a ra, hm lng oxyt nhm, st v titan tng. Cc khong vt biu sinh hin din trong i ny ch yu l cc khong vt st, haluazit, nutahulazit, kaolinit; t hn l gtit, limonit v ilmenit. Chiu dy i saprolit 4-5m, l ra nhng khu vc b bc mn nh ti khu vc Ty Nam m.2.2.2.3. i litomai ny l sn phm phong ha trit t bazan, thnh phn ch yu gm st c mu sc t mu xm sng n tm xanh, nu, nu , lm m trng. Cc khong vt th sinh bao gm: kaolinit, haluazit, gipxit, hematit. i ch cn c th phn bit c nhng hnh v ng tm ca bazan. i khi cn thy st li c nhn bazan bin i yu, nhng thng cc nhn v ng tm c thnh phn kaolinit - gtit - gipxit. phn ngoi, lng kaolinit, haloizit v gtit tng. Nn st cn c cc di tch ca kin trc bazan, trong cn phn bit c nhng vi th plagioclas c thay th gipxit v kaolinit. phn trn ca i c cc l hng, do ra la v chng c ph bng lp v mng ng tm gm gtit cha bauxit. Chiu dy i c ch n vi chc mt. 2.2.2.4. i laterit bauxiti laterit cha bauxit gm alit v bauxit, phn b nh v mt phn sn. i ny thng c mu nu . i laterit bauxit c ni l hn ln trn mt t, nhng phn ln chng b ph bi lp th nhng.i ny gm cc loi bauxit cu to kt vn, kt hch cng, gi cu, t hn l bauxit kt tng giu st nm xen ln trong st, bt mn. T l v kch thc cc kt hch cng tng dn t di ln trn. T di ln, hm lng kaolinit gim dn v gipxit, gtit tng. Trong din tch thm d i laterit nm su t 0-12m, c chiu dy t 1-10m trung bnh 2,8m. Cc thn qung bauxit u thuc i ny. Hm lng trung bnh ha c bn bauxit laterit nguyn khai trong khu m: Al2O3 40,77%; SiO2 8,02%; TiO2 3,69%; Fe2O3 23,28%. (Ph lc 6 quyn s 1, tp ph lc 6-1)Trong mt ct ca i, s bin i theo quy lut chung v thnh phn v cu to ca bauxit nh sau (t di ln trn):- Bauxit dng mnh x: dng bauxit ny c dng r cy, giun, san h x v kt vn. Thnh phn khong vt ch yu l gipxit st, cc mnh v bauxit cha nhiu gipxit t nhng khi nt dng cu nm trong khi st oxyt nhm mm b. Di knh hin vi, bauxit dng mnh vn c kin trc khng ng nht to nhng tp hp gipxit v gtit nm xen k nhau mt cch khng ng u. nhiu mnh cn thy kin trc bazan dng b gi hnh. Kch thc ca cc mnh vn v kt vn t 0,5cm n 2-3cm. phn trn ca tng, kch thc cc mnh ln hn (5-10cm) v ph bin cc di tch ca bauxit b gi hnh cng nh cu to dng khi nt dng cu ng tm (bauxit gi cu).Hm lng theo th tch ca cc mnh v kt vn tng t di ln vi % n >30%. Do thnh phn ha cng thay i tng ng t loi alit chuyn dn sang bauxit.- Bauxit dng l hng rng xp kh ph bin, cc l hng thng mo m, nhiu khi c lp y bng cc ht gtit v gipxit dng tinh th mn. mt s l hng v trong nn xut hin c kaolinit dng vy mn to thnh tp hp m mo m.- Bauxit kt vn c mt ch yu cc chn sn dc. Vt liu gn kt l st dnh bao gm gipxit, gtit v kaolinit, trong kaolinit chim phn nhiu hn c gipxit phn tn trong khi t dng ht gi hnh, theo tinh th th sinh tham gia lp y cc l trng v khe nt. Gtit phn tn u trong nn st. Chiu dy ca lp bauxit dng mnh - kt vn t 1m n 2m.- Bauxit dng kt tng l loi kt tng ca hydroxyt st v nhm. Loi ny pht trin phn trn cng ca i laterit cha bauxit nhng khng ng u, ch yu cc nh i. Nhn chung bauxit dng cng kt tng cha nhiu st hn so vi bauxit gi cu nm pha di. Chiu dy t 0m n 2-3m. Bauxit dng kt tng gm tp hp bauxit gi cu ngun gc phong ha. Cc khi cu ny c gn kt yu t vi nhau bng vt cht st c ln cc vn bauxit giu st gi cu. Kch thc ca cc gi cu l t 5-10cm n 0,5m. - Bauxit gi cu c nhiu loi hnh vi mu sc v cng khc nhau, t loi xp vi mu vng n xm sng v loi cng chc mu nu vng giu nhm v cha hydroxyt st. Thng s tp trung nhm hoc st din ra theo quy lut trong ni b cu to v ng tm. Oxyt st phn ln c lng ng trn b mt cc khi v dng cu. Nhiu khi nhn ca bauxit ny mi giai on mm b c mu vng hoc , i khi n cn cha kaolinit (NC. 20580). Nn gm mnh bauxit gi hnh, laterit v vt cht st cha st do s ph hy mnh nhng khu vc ca gi cu cha kaolinit v t gipxit ht nh v mn xm tn trong . 2.2.2.5. Lp th nhngi laterit cha bauxit c ni l hn ln trn mt t, nhng phn ln chng b ph bi lp th nhng. Lp ny thng l st, bt mn, xp mu nu ln t ct sn, mnh bauxit, chiu dy lp t 0-6,5m.

Anh 2-1: Bauxit dang x, manh va gia cuAnh chup tai thn 9 - ak Nia (NC.20580)

nh 2-2: Mt ct v phong ha bauxit ti cu k Tt2.2.3. c im a moM bauxit khu vc Nhn C c cu trc c trng ca a hnh cao nguyn bazan, nghing v pha Nam - ng Nam. cao tuyt i tng dn t pha ty nam (430m) ln ng bc (740m). Mng li sui pht trin theo hng chnh l bc nam v ty bc - ng nam; kh pht trin cc khe rnh ngn, dc, c phng vung gc vi h thng sui chnh. Cc h thng sui ny chia cao nguyn thnh nhng dng a hnh phc tp, cao tng i ca nh 40-150m. Trn bnh chng c dng hnh a mip, sn nhn chung khng i xng, dc 10-15o. Thung lng sui thng c dng ch "v", phn ct ngang ln, phn ct su nh. Vi nhng c im a hnh trn, c th phn chia khu m thnh nhng n v a mo sau:2.2.3.1. Nhm cc b mt san bng* Cc b mt a hnh dng vm ph b san bngPhn b bao trm khu vc Kin c vi cao 650-750m. a hnh c hnh thnh trn cc thnh to bazan h tng Tc Trng (N2 - Q1tt). B mt a hnh b bin i t nhiu do qu trnh ngoi sinh, thng to ra cc b mt rng v nm ngang, sn tng i dc, sui dng ta tia, thot nc d dng. * Cc b mt a hnh xm thc bc mnKiu a hnh ny phn b khu vc pha Bc v Ty Bc vng nghin cu. a hnh pht trin trn thnh to bazan h tng Tc Trng. B mt a hnh c dng i, ni, ko di, ng phn thy hp to nn mng li dng chy c mt kh cao l cc sui, khe rnh.* Cc b mt a hnh bc mn tch tL dng a hnh tng i bng phng hoc ln sng thoi, sn dc 5-10o; phn b dc sn cc sui ln, pht trin hn ch mt s cc thung lng sui, to cc bi bi v thm bc I, bc II, rng hng trm mt, cao vi mt n chc mt, thnh phn bao gm: sn, cui, si, st, laterit...Hin nay, cc bi bi thp lun ngp nc vo ma ma, to nn thung lng i ni snh ly, chng ti xp b mt ny cng vi tch t lng hin i vo tui Holoxen mun (aQ23).2.2.3.2. Nhm cc b mt sn v vch* Sn bc mn ra triChim phn ln din tch nghin cu, c dng hi li, dc trung bnh 15-20o. Cc thn qung phn b a hnh sn thng c b dy ln, pht trin ph bin pha ng Nam vng .* Sn xm thc Lin quan n s nng mnh ca cc dy ni, khi tng dc theo cc t gy, to iu kin cho cc dng chy thng xuyn xm thc. sn, vch xm thc kh ph bin, dc theo cc thung lng k Tih, k RKeh. Sn c thnh to trn c s ph hy b mt san bng v sn xm thc c dc 15- 25o. Trn b mt sn pht trin v phong ha vn th to cc khe rnh c dng ch V, y dc, i ni tch t nhiu khi tng. Cc khe rnh khng nhng ct su vo b mt sn, m ct c vo b mt san bng c trong vng. Hot ng xm thc xy ra lu di cc thung lng, m rng trc din ngang dng ch U (on sui h Cu T, ng vo o Ngha, k Sin)* Sn trng lcPhn b rt hn ch din tch nghin cu, mt s di i bazan, nm tip gip cc thung lng, pht trin qu trnh trng lc gm, l, trt l, sn trng lc c dc t 20-40o hoc to vch ng (vch sui, thc du lch Gia Ngha, ng Nam k Sin. Cc im kho st NC.35410, NC.20566, )Qu trnh a mo ng lc hin ti l xm thc km l mnh, ni c a hnh chuyn bc t ngt, pht trin dc theo chiu di. chnh cao ca sn kh ln, t 40m n 200m, dc theo sn c nhiu din tch nh pha ng k Nia. Do hot ng canh tc khai ph trng cy ci trn sn to nn cc li trt nh thng c dc t 35-45o.Nhn chung cc b mt sn trong vng c mt qu trnh pht trin lu di tui t Pleistocen cho n nay, hin nay qu trnh hot ng vn xy ra mnh m.

nh 2-3: a hnh dng i kiu yn nga cha bauxit lateritnh chp ti im kho st NC. 205662.2.4. Cc dng a hnh2.2.4.1. Dng bc mnDng a hnh ny c mt nhiu ni trong vng nghin cu. l tng hp qu trnh phong ha, vn chuyn vt liu ra tri cc sn do dng chy trn mt, c nhiu yn nga nm ri rc trong vng, nht l trung tm khu m, ni qu trnh bc mn xy ra mnh, c nhiu i dng bt p.Trong din tch khu m pht trin y cc dng thung lng xm thc, ng vi cc thi k pht trin khc nhau ca sng sui. thung lng dng ch V, ph bin trong ton vng ch yu nhng sui cp I, II. y l nhng thung lng hp, cha nc hoc kh cn, ph thuc vo lng ma hng nm. Thung lng dng ch u cng kh ph bin, ch yu sui cp III, cc thung lng ny thng hoc hi cong, lng c tch ng trm tch bi bi v dc thung lng thng c cc thm bc I thng gp dng nghing thoi hoc gn nm ngang. Thung lng c bi bi vi b mt nm ngang rng, un khc quanh co, nhiu ni c hin tng gn nh m ly ha2.2.4.2. Dng thung lngDng thung lng kh ph bin trong khu m, l nhng bn thu nc cc cao khc nhau, ni tch t nc ca cc sui cp I, rnh xm thc.Cc mng xi, rnh xi pht trin rng ri, trn ton vng, c bit tp trung nhiu cc sn xm thc. Kch thc ca chng khc nhau ph thuc vo thi gian hot ng v tnh cht ca nn. Hot ng ca mng xi l vn chuyn cc sn phm ca phong ha c hc xung chn sn, hnh thnh cc nn khong vt. Thnh to ny phn b ch yu dc thung lng sui k RKeh (khu o Ngha).Dng chy thng xuyn thng ng vi cc sng sui cp III, IV bao gm:- Mng ta tia c c trng bi s phn nhnh ta tia ca cc thung lng t mt vng nht nh. Chng phn b pha Bc v ng Bc khu m.- Mng cnh cy rt ph bin trong vng. H thng sng sui ging nh mt thn cy phn nhnh. thn cy tng ng vi sui cp III, cn cc nhnh ng vi cp I, II l dng ph vo sui ny.2.2.4.3. Dng trng lcTrong din tch khu m, cao nguyn bazan b chia ct to a hnh dng i. Cc sn i thng c dc 5-200. Vt liu ph hy c hc gm st bt, sn si laterit t nh i v sn c a xung chn sn to cc vt gu sn tch. Cc vt gu ny thng hp phn b ph bin lng sui k RKeh. Ngoi ra trn cc sn c nhng on dc trn 300, qu trnh trng lc xy ra mnh m.2.2.4.4. Dng nhn sinh cc thung lng sng sui ln, trn cc b mt pedimen, sn i bazan, con ngi tin hnh hng lot cng trnh xy dng ng x, p , p, sn xut nng nghip lm thay i b mt nguyn sinh ca a hnh.

nh 2-4: Dng a hnh bc mn nh chp ti k Sinnh 2-5: Dng a hnh thung lng, nh chp ti k Sin2.3. c im cc thn qung cng nghip2.3.1. c im chung cc thn qung cng nghipCc thn qung bauxit phn b trn cc nh i, sn thoi u khp trong phm vi m. Mc cao phn b ca cc thn qung gim dn t phn Ty Bc (680 740m), ng Bc (650 700m) xung phn trung tm m (600 650m) v thp nht phn Ty Ty Nam m (550 650m). Kch thc v hnh dng ca cc thn qung cng rt khc nhau: t vi trm nghn m2 n hn 10km2. Cc thn qung pht trin ch yu theo phng ty bc ng nam, bc nam v mt t theo phng ng bc ty nam. Chng ko di t 2km n 13 14km; rng t vi trm mt n >1.000m. Chiu dy ca thn qung thay i t: 1,0 10m, trung bnh 2,8m v ph thuc vo yu t a hnh - a mo.Hm lng cc thnh phn trong qung bauxit nguyn khai thay i kh ln: Al2O3 t 19,93-51,74% trung bnh 40,77%; h s bin thin l 10,40%; SiO2 t 1,74-23,00% trung bnh 8,02%; h s bin thin 46,76%. (Ph lc 6 - quyn s 1, tp ph lc 6-1).Thnh phn vt cht trong cc thn qung gm cc mnh, tng, kt hch, kt vn nm trong st mm b; t l v kch thc ca chng gim theo chiu su. Theo hnh thi v cu trc c th phn chia ra 2 loi qung bauxit chnh trong khu m: bauxit dng b ri l ph bin v bauxit dng kt tng. Cc c im v thnh phn vt cht, kch thc, mu sc, din phn b, hm lng cc hp phn ca cc loi qung bauxit nu trn m Nhn C cng c nhiu nt tng ng nh qung cc m khc ca trng qung k Nng. Hnh thi thn qung trong m bauxit ti khu vc Nhn C, tnh k Nng c xem nh l hnh dng, kch thc v s thay i ca chng trong khng gian, khi nh gi hnh thi thn qung chng ti da vo 2 yu t chnh l: modul ng vin thn qung v h s bin i chiu dy thn qung ca than qung cng nghip trong ton m, trong .- Cng thc xc nh modun ng vin thn qung ()Mc phc tp

n gin < 1,4

Tng i phc tp 1,4 - 1,6

Phc tp 1,6 - 1,8

Rt phc tp> 1,8

Trong :Ltd: Chu vi thn qung o c trn bnh ;btd: chiu di thn khong o c trn bnh ;Std: din tch thn khong xc nh c trn bnh ;Mc phc tp v hnh dng c phn theo gi tr nh sau - Cng thc xc nh h s bin i chiu dy thn qung (Vm)Mc n nhVm %

n nh< 40

Tng i n nh40 - 60

Khng n nh60 - 100

Rt khng n nh> 100

Trong :: qun phng saimi: chiu dy thn qung ti cc im cng trnh thm d

: chiu dy trung bnh ton thn qungn: s lng im tham gia tnh ton.

17

Bng thng k cc thng s thn qungmodul ng vin v h s bin i chiu dy thn qung theo cc than qung cng nghipBng:2-1STTKhu vcThn qungThng s thn qungc im hnh thi thn qung

Chiu dy qung (m)Qun phng sai theo chiu dy qungChu vi thn qung (km)Chiu di thn qung (km)Din tch thn qung (km2)H s bin i chiu dy thn qung (%)Mc n nh chiu dy thn qungModun ng vin thn qungMc phc tp thn qung

1Kin ThnhTQ6b3,831,218,671,61,1931,59n nh1,97Rt phc tp

2Kin ThnhTQ6c3,011,281,780,60,1942,52Tng i n nh1,09n gin

3Kin ThnhTQ6d3,261,4112,442,91,4943,25Tng i n nh1,94Rt phc tp

4Kin ThnhTQ7a3,301,696,272,10,5551,21Tng i n nh1,45Tng i phc tp

5Kin ThnhTQ7b2,571,075,061,20,4641,63Tng i n nh1,72Phc tp

6Kin ThnhTQ7c3,511,4719,123,52,1941,88Tng i n nh2,44Rt phc tp

7Kin ThnhTQ8b4,091,4768,755,69,2235,94n nh4,86Rt phc tp

Trung bnh khu Kin Thnh3,3741,15Tng i n nh2,21Rt phc tp

8k SinTQ372,611,025,941,60,6739,08n nh1,59Tng i phc tp

9k SinTQ39a4,131,4861,768,58,6135,84n nh3,37Rt phc tp

10k SinTQ403,831,516,521,70,9139,43n nh1,58Tng i phc tp

11k SinTQ41a4,221,3923,354,73,5732,94n nh2,26Rt phc tp

12k SinTQ41b3,551,454,961,90,5740,85Tng i n nh1,25n gin

Trung bnh khu k Sin3,6737,63n nh2,01Rt phc tp

13Nhn CTQ22,890,9417,492,62,0132,53n nh2,71Rt phc tp

14Nhn CTQ3a2,661,0213,903,41,1938,35n nh1,97Rt phc tp

15Nhn CTQ3b2,370,693,241,30,2629,11n nh1,20n gin

16Nhn CTQ4a2,300,871,600,60,0937,83n nh1,19n gin

17Nhn CTQ4b2,590,825,551,80,4731,66n nh1,47Tng i phc tp

18Nhn CTQ5a2,991,145,501,80,3938,13n nh1,48Tng i phc tp

19Nhn CTQ5b1,790,561,590,50,1731,28n nh1,07n gin

20Nhn CTQ5c2,080,704,701,30,4033,65n nh1,58Tng i phc tp

21Nhn CTQ6a4,011,779,773,10,7444,14Tng i n nh1,58Tng i phc tp

22Nhn CTQ8c3,231,2917,605,51,9239,94n nh1,63Phc tp

23Nhn CTQ8d3,171,4228,304,73,1344,79Tng i n nh2,76Rt phc tp

24Nhn CTQ8e3,111,504,681,50,3048,23Tng i n nh1,50Tng i phc tp

25Nhn CTQ10a2,201,042,601,00,1547,27Tng i n nh1,25n gin

26Nhn CTQ10b2,480,9415,554,91,1437,90n nh1,64Phc tp

27Nhn CTQ113,260,914,761,70,4227,91n nh1,34n gin

28Nhn CTQ122,161,125,561,70,3851,85Tng i n nh1,57Tng i phc tp

29Nhn CTQ132,121,1312,233,00,9053,30Tng i n nh1,97Rt phc tp

30Nhn CTQ14a2,621,1111,342,80,9842,37Tng i n nh1,92Rt phc tp

31Nhn CTQ14b2,960,663,611,00,3622,30n nh1,45Tng i phc tp


33Nhn CTQ26b1,740,873,961,20,3850,00Tng i n nh1,43Tng i phc tp

34Nhn CTQ26c2,410,462,821,10,3019,09n nh1,15n gin

35Nhn CTQ27a3,641,355,091,20,4237,09n nh1,76Phc tp

36Nhn CTQ27b3,321,738,942,90,5752,11Tng i n nh1,56Tng i phc tp

37Nhn CTQ27c3,360,712,050,70,1621,13n nh1,22n gin

38Nhn CTQ27d2,211,445,891,80,4465,16Khng n nh1,56Tng i phc tp

39Nhn CTQ27e2,741,084,771,80,4339,42n nh1,29n gin

40Nhn CTQ27f3,121,494,141,40,5447,76Tng i n nh1,28n gin

41Nhn CTQ27g1,450,612,150,90,1442,07Tng i n nh1,14n gin

42Nhn CTQ27h1,720,572,630,90,2333,14n nh1,26n gin


44Nhn CTQ28b2,701,061,510,50,1439,26n nh1,09n gin

45Nhn CTQ28c1,780,672,360,80,1637,64n nh1,30n gin

46Nhn CTQ304,131,6947,035,05,5840,92Tng i n nh3,97Rt phc tp

47Nhn CTQ32a4,141,643,051,10,3239,61n nh1,22n gin

48Nhn CTQ32b3,731,5321,404,83,1541,02Tng i n nh2,08Rt phc tp

49Nhn CTQ32c3,962,862,321,00,2872,22Khng n nh1,03n gin

50Nhn CTQ333,491,479,263,41,3342,12Tng i n nh1,34n gin

51Nhn CTQ343,030,977,832,00,9832,01n nh1,69Phc tp

52Nhn CTQ352,641,103,190,90,2441,67Tng i n nh1,49Tng i phc tp


54Nhn CTQ36b3,711,2717,553,62,0634,23n nh2,22Rt phc tp

55Nhn CTQ44a2,421,136,041,50,5646,69Tng i n nh1,73Phc tp

56Nhn CTQ44b2,531,254,461,20,2849,41Tng i n nh1,68Phc tp

57Nhn CTQ44c2,490,883,301,00,2335,34n nh1,46Tng i phc tp

58Nhn CTQ44d1,840,842,730,90,1345,65Tng i n nh1,43Tng i phc tp

59Nhn CTQ45a2,661,279,592,60,7747,74Tng i n nh1,78Phc tp

60Nhn CTQ45b2,961,0518,303,81,5735,47n nh2,29Rt phc tp

61Nhn CTQ45c2,541,272,670,90,1950,00Tng i n nh1,32n gin

62Nhn CTQ45d2,571,048,731,80,6740,47Tng i n nh2,13Rt phc tp

63Nhn CTQ45e2,880,281,810,60,129,72n nh1,25n gin


65Nhn CTQ48b3,071,084,261,10,3635,18n nh1,61Phc tp

66Nhn CTQ48c2,430,892,801,20,2036,63n nh1,15n gin

Trung bnh khu Nhn C2,7539,56n nh1,62Phc tp

2.3.2. c im cc thn qung cng nghip khu Kin ThnhKhu Kin Thnh nm pha Bc, Ty Bc m bauxit tai khu vc Nhn C bao gm cc thn qung cng nghip sau: TQ6b, TQ6c, TQ6d, TQ7a, TQ7b, TQ7c, TQ8b. Cc thn qung bauxit cng nghip khu Kin Thnh c dng a mo l t hp cc nh v sn thoi lin tc, c phng ko di chung theo phng bc nam hay ty bc - ng nam, b phn ct bi nhng khe sui ngn to ra hnh thi dng a mip vi quy m ln nh khc nhau, cao phn b qung 600-697m. Cc thn qung cng nghip y c chiu di t 0,6-5,6km, chiu rng thay i 0,4-1,5km, qua thng s v modun ng vin cc thn qung cng nghip khu Kin Thnh = 1,09 - 4,86 (bng 2-1) iu cho ta thy cc thn qung cng nghip y c hnh thi t n gin n rt phc tp, din tch trn bnh cc thn qung cng nghip cng rt khc nhau t 0,19 9,22km2. Cc i lateri bauxit trong khu Kin Thnh c khng ch bi 1.845 cng trnh khoan v ging, trong c 1.703 cng trnh nm trong cc thn qung cng nghip, chim 92,3%. Chiu dy trung bnh cc thn qung cng nghip t 2,57-4,09m; trung bnh 3,37m; h s bin i chiu dy cc thn qung t 31,59-51,21%; mc bin i chiu dy cc thn qung t n nh n tng i n nh. H s bin i chiu dy cc thn qung cng nghip trung bnh khu Kin Thnh 41,15% l tng i n nh (bng 2-1). Qung c chiu dy ln thng tp trung phn nh dng vm thoi, phn ra chiu dy gim. Cc cng trnh c chiu dy cng nghip ln tp trung trung tm thn qung. thu hi tinh qung +1mm cc thn qung cng nghip y t 35,21-41,61%; trung bnh 37,38%. (bng 2-3; ph lc 10 quyn 5, tp ph lc 10-3)Cht lng cc thn qung cng nghip tng i ng u trong ton khu Kin Thnh. Hm lng Al2O3, SiO2, Fe2O3, TiO2 v MKN bin i n nh. Hu ht cc cng trnh khng t ch tiu cng nghip u nm phn ra thn qung v cc v tr a hnh dc. Qung bauxit cht lng tt phn b trn cc chm i, nh phn thy, v tr a hnh dng vm thoi, cng ra ven ra cht lng c xu hng gim dn. Theo chiu su t trn xung c s gim dn hm lng Al2O3, v SiO2 tng dn. Trong cc thn qung cng nghip c hm lng Al2O3 tinh qung t 50,58-52,03% trung bnh l 51,12%; hm lng SiO2 tinh qung t 2,83-3,64% trung bnh l 3,35% (bng 2-3, ph lc 10- quyn 4, tp ph lc 10-3). Hm lng cc tp cht c hi thp: P2O5 0,17%, SO3 0,08%, tng cacbon hu c (CHC) 0,12%, Cr2O3 0,06% (bng 2-3, ph lc 6 - quyn 1). Nguyn t him c ngha l V vi hm lng 206(g/tn), nguyn t Ga c hm lng 38,53(g/tn), nguyn t Sc c hm lng l 27,65(g/tn), ngoi ra cc nguyn t khc cn li tn ti di dng vt (bng 2-4, ph lc 6 - quyn 1).

Bng thng k cc thng s cht lng qung nguyn khai trong khu Kin ThnhBng 2-2N = 315 muSiO2 (%)Al2O3 (%)Fe2O3 (%)FeO (%)TiO2 (%)MKN (%)

Gi tr nh nht1,822,7627,8314,650,2416,28

Gi tr ln nht20,825,3451,7440,841,9026,21

Gi tr trung bnh7,763,9141,2922,560,8222,19

lch tiu chun3,740,513,843,490,332,01

H s bin thin48,2013,049,3015,4740,249,06

Bng thng k cc thng s cht lng tinh qung trong cc thn qung cng nghip khu Kin ThnhBng 2-3STTTn thn qungPh (m)Qung (m) thu hi tinh qung (+1mm)Hm lng cc thnh phn c bn (%)Modun silic

SiO2Al2O3Fe2O3FeO TiO2 MKN

1TQ6b0,663,8337,733,4551,3114,130,662,3426,7216,58

2TQ6c1,043,0141,613,5652,0313,370,502,3027,0916,31

3TQ6d0,913,2637,143,4951,0614,540,672,3426,6716,75

4TQ7a1,233,3035,673,2651,3414,480,702,3826,6119,07

5TQ7b1,772,5738,723,6450,8914,470,582,3826,5715,66

6TQ7c0,973,5135,213,2250,6415,050,672,3726,6318,01

7TQ8b1,374,0935,592,8350,5815,680,692,3126,6620,39

Gi tr nh nht0,662,5735,212,8350,5813,370,502,3026,5715,66

Gi tr ln nht1,774,0941,613,6452,0315,680,702,3827,0920,39

Gi tr trung bnh1,143,3737,383,3551,1214,530,642,3526,7117,54

Bng thng k cc nguyn t i km trong cc thn qung khu Kin Thnh Bng s 2-4N=17 muAu (g/t)Ag (g/t)Se (g/t)Te (g/t)Hf (g/t)Ga (g/t)Rb (g/t)V (g/t)Cs (g/t)Sc (g/t)

Gi tr nh nht34317423

Gi tr ln nht45626138

Gi tr trung bnh

ban loi bauxit nhân cơ

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