PT. VALE INDONESIA Tbk SOROWAKO OFFICE Sorowako 91984, South Sulawesi, Indonesia Phone : (62) 021 5249100, 5249200 : (62) 0411 318545, 320700 Fax : (62) 021 5249560, 5249570

CERTICATE

This is to certify that :

ADI SATRIO WICAKSONOPractical WorkBadge No. 321. 08. 2015Participant of Practical Student Program

He worked as participant of practical student program who assigned to Study Slope Stability at Anoa disposal in Mine Engineering of Short Term Planning Section within Mining Department PT Vale Indonesia Tbk (PT VALE Tbk) Sorowako, South Sulawesi for two months (13th August 2015 up to 4th October 2015 ).

He shown a good cooperation, right personality towards the role and responsibility, quick learner, able to work under tight deadline and pressure, able to work well independently or in a team, concern to result and detail process, good communication skill, and having pleasant personality.

We thank for his cooperation in our Department, so we recommend him to any of prospective company and hope He will success in his future career.

Sorowako, 30th September 2015 Person In Charge ( Manager Short Term Planning )

Andi Nur Taslim B/N: 6702

STATEMENT LETTER PRACTICAL WORK

This is certify that;

Name : Adi Satrio Wicaksono

Place / Date of birth : Sorong / June 9th, 1994

University / Academ: Universitas Muslim Indonesia

Faculty / Departmen: Teknologi Industri / Teknik Pertambangan

Report title : Slope Stability Studies In Planning Anoa Disposal

Job & location : Short Term Planning Classification : Practical Work

Reason of termination : Finished

Period of service : 13th August 2015 up to 4th October 2015 Remark: Good Manner

During this service in our departement this person has proved his self to be capable cooperatif and willing to work hard. Sorowako, 30th September 2015 Person In Charge ( Manager Short Term Planning ) Andi Nur Taslim B/N: 6702

A list of work activities

1Design a disposal territory manually or using Vulcan software (Mine design software)

2Determine the secure level of the slope using software Geostudio 2007

3Calculate the volume of a disposal area

4Determine a safety limit for dumping area at disposal.

JAKARTA OFFICE : BAPINDO PLAZA II, 22nd Floor Jl. Jenderal Sudirman Kav. 54-55 Jakarta 12190, Indonesia PO. BOX 2799, Jakarta 10001 Phone : (62) 021 5249000 Fax : (62) 021 5249030 (Sharaholder Services), (62) 021 5249020

MAKASSAR OFFICE : 281 Jl. Somba Opu Makassar 90001 PO.BOX 1143, Indonesia Phone : (62) 0411 873731 873732 Fax : (62) 0411 - 856157, (62) 021 - 5249520