Our People

Our Management

Technical Team

Technical Associate

STJ Budi Santoso has a total of 26 years of national and international work experience in exploration, project development and operation for both principal technical and senior management levels in several major mining companies such as Western Mining Company, Cyprus Amax, Phelps Dodge Corp, Freeport-McMoRan, BHP Billiton and J Resources.
STJ Budi holds a Master of Economic Geology from the University of Tasmania. He is an exploration geologist with strong field and sound technical background with a proven track record of discoveries and resources expansion in a wide range of commodities, mostly in major deposit types of gold, copper and cobalt.
STJ Budi is a member of AusIMM, SEG, Lindgren Awards Committee of SEG, IAGI (CPI-IAGI), Joint Committee (Kombers) KCMI IAGI-PERHAPI and trusted to be the Chairman of MGEI in the second period from 2021 until 2024.

STJ Budi Santoso

Bowo Kusnanto has over 25 years of experience in the resources sector including 15 years in exploration managerial roles of various both ASX and BEI listed companies; such as Freeport Mc Moran, Zinifex, Perilya, Oxiana/MMG, Tiger Realm Minerals, J Resources and Asiamet Resources. Kusnanto holds a bachelor's in geology from UPN, he is an exploration geologist with a solid technical background in a wide range of project stages from greenfield, brownfield and operating mines with proven track records for every project and position he held either in Indonesia or overseas. Bowo is a competent person for the exploration reporting of gold, copper and its associated minerals.

Bowo Kusnanto

Gyaista Sampurno has over 25 year’s experience in the resources sector including 5 years as Chief and Principal Geologist of J Resources. Sampurno is a strong field-oriented and technology-literate exploration geologist with a solid overseas assignment background. He graduated from ITB in 1996 and since then had been taking field technical roles in Genex, Greenfield and Brownfield exploration for deposit types of LSE, HSE, Porphyry and IOCG mostly with Newmont and J Resources Nusantara.

Gyaista Sampurno

David Iswanto is a field-oriented with rounded experience Geologist in Generative and Greenfields to Brownfields detailed Exploration work equipped with strong understanding of various gold, copper and base-metal deposit including Porphyry, High Sulphidation Epithermal, Intermediate Sulphidation Epithermal, Low Sulphidation Epithermal, Sediment Hosted, Skarn, Orogenic, mostly for gold, copper and other base-metal deposits. He has significant track record as part of Discovery Team at several prospects and significant contribution on incremental resources in several operation Gold Mines in Indonesia.

David Iswanto

Arief is a strong field-oriented senior geologist with 12 years of experience in mastering geological understanding, conceptualizing and executing exploration for complex deposits within greenfield, brownfield and advanced exploration programs. He is a part of the successful technical team at Pani Project, Doup, Bolangitang and the generative exploration program in J Resources.

Arief Eko Prihandoyo

Ahmad is a strong field-oriented senior exploration geologist with 12 year-round experience in exploration with strength in QAQC, generative exploration and technical due diligence for multi-commodity mostly for Nickel laterite, Bauxite and Coal.

Ahmad Hidayat

Muhaemin B Sutami is an experienced mineral resource specialist with more than 15 years experience. He is a member of AusIMM and also a Competent Person Indonesia CPI-IAGI qualified resource estimation of primary gold of epithermal and intrusion related deposits. He also possesses broad commodity experience including precious metals, nickel laterite, bauxite, base metals and iron ore. He has extensive experience of mineral projects in Indonesia throughout resource estimation, mine geology, project feasibility study and been working in some companies in Indonesia e.g. Antam and J Resources.

Muhaemin B Sutami

Tomy is a senior metallurgist with more than 16 years of experience in gold and nickel commodities.

Tomy Taladin, ST, MBA (PMP)

Saut is a senior mine and resource geologist with experiencing from greenfield to brownfield geologist exploration and project development with extensive in mine geology and mineral resource experience over the past 24 years with a solid background in mineral resources, mine production and project development in a small and large Au-Ag epithermal low sulphidation and Au orogenic, Au high nugget narrow vein deposits, Cu-Au porphyry deposits, Cu-Zn base metal deposits, iron ore deposits. He is familiar with Mineral Resource Estimation (Linear and Non-Linear Estimation) for Underground and Open Pit mining using Vulcan, Isatis and Supervisor mining software including estimation evaluations/review and audits, desktop study and due diligence. He has strong international assignments and has worked with Newmont, Oxiana, SRK, Quantitative Group, Evolution Mining and MMG. He is a competent person; CP (Geo) AusIMM for Mineral Resource Technical reporting for annual mineral resource report to ASX (Australia Stock Exchange).

Saut Simbolon, M.Sc.

Patar Simbolon is a senior mine engineer with more than 15 years of experience in the surface (open cut/open pit/quarry) mining operation and consulting. His strong background is in coal and metal covering mine planning, drill and blast, mining fleet and its operation, production reporting, project cost and people management. Patar is familiar with mining software packages such as Mincom Minescape, Minex, Surpac, Whittle, Datamine, XPAC, Talpac, Micromine and AutoCAD. He is certified as a Competent Person Indonesia (CPI) under the KCMI Code 2017 for Reserve Estimate Sign-off for Gold (and other related minerals) commodities.

Patar Simbolon, B.Eng.

Kartika Dwi Handayani is an experienced senior coal geologist with more than 25 years experience covering various roles both technical and managerial in major national and multinational mining companies and mining services companies. Her experience includes detailed technical exploration work in greenfields, brownfields, resource estimation, mine operation, exploration project management and complex technical due diligence. She is resource geologist, member of AusIMM and is a competent person under JORC code for coal Resource estimation reporting and sign-off.