About / CV

Jeffrey Halim
Resource Geology · Mine Development · Mineral Investment
01 / PROFESSIONAL SUMMARY
I am a resource geologist and mine-development professional with more than seven years of experience across nickel and copper-gold projects in Indonesia. My work has taken me from field exploration/operation and resource modelling to mine planning, project delivery, due diligence, financial modelling, and mineral-asset evaluation. I work comfortably across Indonesian, English, and Mandarin-speaking professional teams, connecting technical knowledge with the executives who need to act on it.
02 / PROFESSIONAL EXPERIENCE
Huayou International Mining (Hong Kong) Ltd.
Project Manager
2024-2026
Project locations: Aceh, Sulawesi, Maluku
- Managed a mining-services unit (IUJP), completing four projects within one year while coordinating on commercial delivery, technical scope, and project execution.
- Directed an approximately 80-person programme across three nickel IUPs, completing the drilling programme around two weeks ahead of target and delivering three resource reports aligned with SNI 4726:2019.
- Directed an approximately 60-person exploration programme, completing drilling around two weeks ahead of target and supporting a resource estimate aligned with KCMI 2017.
- Coordinated contractor scopes, drilling equipment, budgets, schedules, sampling controls, and other requirements.
Resource Geology Superintendent (Business Development)
2024-2026
Base locations: Jakarta
- Leads a five-person bilingual team evaluating nickel and copper-gold opportunities through desktop review, field verification, resource assessment, mine-development analysis, and investment evaluation.
- Manages technical priorities across approximately 20–30 prospects, integrating geological, geochemical, drilling, topographic, satellite, regulatory, and operational information.
- Supported more than 15 technical-commercial due-diligence evaluations and developed integrated technical-financial models for five mining concessions and development cases.
- Contributed to the technical evaluation supporting two completed nickel-mine acquisitions.
- Reviews resource-estimation methods, feasibility studies, RKAB production plans, mine schedules, operating costs, smelter-feed requirements, regulatory constraints, sensitivities, and DCF valuation.
PT. Merdeka Mining Servis (Merdeka Copper Gold)
Ore Study Geologist (Resource Modeling)
2023-2024
Project locations: Wetar, Maluku
- Maintained and updated JORC-aligned resource models for a producing VHMS copper-gold-iron deposit using exploration, density, grade-control, and production data.
- Prepared model-to-production grade-tonnage reconciliation, together with three-month rolling and annual production forecasts.
- Integrated geological, statistical, and operational density studies from three technical groups to improve resource-model reliability and planning confidence.
- Identified key drivers of model-to-production variance through drill-hole spacing and spatial analysis.
- Developed structural-geology, geotechnical, and hydrogeological interpretations to support slope-risk mitigation under complex operating-pit conditions.
- Applied QA/QC and documentation controls to drilling, sampling, density measurements, geological databases, geological samples, and resource model inputs.
PT. Bintang Raya Inti Bumi
Wellsite/Exploration Geologist
2023
Project locations: Dompu, West Nusa Tenggara
- Supported copper-gold exploration drilling through geological logging, sampling, physical sample control, database validation, and field QA/QC as contractor for PT Sumbawa Timur Mining (Vale Base Metal).
- Supported approximately 2,500 metres of drilling per month across five drill rigs, with productivity reaching approximately 25 metres per rig per day.
- Coordinated with contractors and consultants acquiring geophysical, hydrological, and geothermal information using newly introduced field technologies.
- Maintained field-safety and data-quality KPI throughout the shift, with operations completed without a lost-time injury.
PT Huayue Nickel Cobalt
Project Manager
2022-2023
Project locations: Konawe, Sulawesi
- Coordinated major mining, construction, and infrastructure workstreams within a nickel-cobalt hydrometallurgical development.
- Managed technical and operational interfaces across approximately 3,000 personnel, including around 2,200 Indonesian and 800 Chinese workers.
- Coordinated material movement, 15 major installation units, and supporting infrastructure across the project area.
- Conserved low-grade limonite through improved material management, contributing to an estimated 10% realised cost reduction against budget.
- Managed delivery of approximately 30 kilometres of buried slurry pipeline, completed three months ahead of schedule through coordinated engineering, contractor, logistics, and field execution.
- Reduced the monthly workplace incident rate by more than 50% within one year through work-permit systems, contractor controls, inspections, risk management, and coordinated safety responsibilities.
- Coordinated feasibility, environmental, engineering, mine-design, geotechnical, hydrological, infrastructure, regulatory, community, and government interfaces across the mining and construction programme.
Mine Geology & Engineering Superintendent
2021-2023
Base locations: Morowali/Konawe/North Kolaka, Sulawesi
- Led a cross-functional team of up to 20 engineers across five nickel-cobalt mining and development projects.
- Coordinated integrated feasibility studies covering exploration, pit design, haul roads, pipelines, smelter infrastructure, geometallurgy, tailings facilities, barging facility, and environmental and social considerations.
- Supported mine and downstream-development studies based on nickel-ore supply of at least 10 Mtpa, approximately 60,000 tonnes per year of refined nickel capacity, and a 20-year planning horizon.
- Improved ore recovery and dilution control through reconciliation against estimated ore blocks and coordination between geology and mine-planning teams.
- Reduced mining costs by approximately 20% through capital synergy and coordinated utilisation of the heavy-equipment fleet across operating requirements.
- Developed the technical basis for a tailings-storage facility with an approximate capacity of 20 million tonnes, incorporating material characteristics, geotechnical feasibility, environmental constraints, and surrounding impacts.
Geologist and Mandarin Translator
2020-2021
Base locations: Morowali/Konawe, Sulawesi
- Prepared drilling plans, geological models, and resource estimates for a nickel exploration target.
- Led approximately 20 personnel in a two-shift, 24/7 sample-preparation and analytical laboratory, improving sample throughput, quality control, and reporting reliability.
- Introduced CAD and GIS collaborative data-management workflows for exploration, mine production, infrastructure, and construction planning.
- Developed SOPs, QA/QC controls, and personnel training for sample preparation, XRF analysis, laboratory safety, equipment, and maintenance.
- Bridged Indonesian and Chinese teams across technical interpretation, reporting, project planning, contractor coordination, and operational discussions.
PT. Lapi ITB
Exploration Geologist
2019-2020
Project locations: Buru Island, Maluku
- Supported geological investigations across the Wapsalit, Ulumbu, and Mataloko geothermal prospects, covering areas of approximately 80–100 hectares per prospect.
- Completed two months of field mapping at Wapsalit and supported community mapping around approximately three villages potentially affected by future development.
- Conducted geological, alteration, structural, and geochemical mapping, together with systematic field sampling and documentation.
- Coordinated technical findings with project geologists, clients, laboratory teams, and subject-matter specialists.
03 / EDUCATION
Institut Teknologi Bandung
Ir. — Engineering Profession Program (Mine Engineering)
2025-2026
Study location: Bandung, West Java
- Cumulative GPA: 4.00/4.00 (24 Credits)
- Verified professional engineering practice based on professional experience in mine economics and the integration of technical and commercial decision-making.
BSc. — Geological Engineering
2015-2020
Study location: Bandung, West Java
- Cumulative GPA: 3.47/4.00 (161 Credits)
- Focused study: mineral exploration, geochemistry, petrography, and renewable energy.
- Communities: Red Cross Volunteer Corp (Chairman), ITB Buddhism Community (Dept. Head), KMPA-Ganesha (Staff)
04 / CREDENTIALS & DEVELOPMENT
Technical Training
- 2025 – MGEI – Porphyry-Epithermal Deposits: Decoding Discovery From Field Data to Ore Models, Surabaya
- 2025 – MGEI – Ni Laterite Deposits Theoretical and Practical Training, Jakarta
- 2025 – Minerco – Nickel Mining Economics, Jakarta
- 2025 – Pitindo – Geological Modelling and Resource Estimation Study Case Nickel, Jakarta
- 2024 – Halo Robotics – Basic Safety and Best Practice on Mining Area Drone Surveying, Jakarta
- 2024 – IAGI/Seequent – Leapfrog Geo Fundamentals, Jakarta
- 2024 – Steve Garwin – Practical Implementation of Anaconda Mapping for Detailed Exploration, Banyuwangi
- 2024 – James Gwee – How to Communicate Effectively
- 2021 – BKTI-PII – Data Mining: Concept and Implementation
- 2020 – KOMINFO – Digital Skills Scholarship Training
- 2020 – APTIKOM – Python for Maching Learning
- 2020 – DataCamp – Python Programming
- 2020 – BMD Street Consulting – Mining Integrated Management System (Based on ISO 9001, ISO 14001 and SMKP/ISO 45001)
Professional Certifications
- FMVA® — Financial Modeling & Valuation Analyst, 2026
- Competent Person BNSP — Expert in Mineral Resource Modelling and Estimation, 2025
- POM — Mid-Level Operational Supervisor, 2023
- POP — First-Level Operational Supervisor, 2022
Languages
- Indonesian (Native)
- English (Advanced Professional Proficiency)
- Mandarin (Professional Working Proficiency)
Leadership Training
- XL Future Leaders Global Thinking Programme (2019)
- Djarum Beasiswa Plus Leadership Programme (2018)
05 / PROFESSIONAL CONTRIBUTION
Professional Memberships
- Member, Australasian Institute of Mining and Metallurgy (MAusIMM)
- Member, Indonesian Mining Professionals Association (PERHAPI)
- Committee Member, Indonesian Society of Economic Geologists (MGEI-IAGI)
- Member, Indonesian Association of Geologists (IAGI)
Teaching & Mentoring
- 2026 – Thesis Supervision – Kelvin Andika Putra (ITB) – CHARACTERISTICS OF NICKEL LATERITE DEPOSITS, THREE-DIMENSIONAL GEOLOGICAL MODELING, AND ESTIMATION OF COBALT DISTRIBUTION USING THE ORDINARY KRIGING APPROACH AT THE LOLEBA SITE, SOUTH WASILE, EAST HALMAHERA, NORTH MALUKU.
- 2026 – Thesis Supervision – Christian Levi Gunawan (ITB) – GEOLOGICAL STUDY AND MACHINE LEARNING APPLICATION (UNSUPERVISED MACHINE LEARNING) FOR CLUSTERING NICKEL LATERITE PROFILE IN EAST HALMAHERA, NORTH MALUKU.
- 2025 – Workshop – ITB Geological Engineering Student Association – Career Road Map in The Mining Industry
- 2025 – Workshop – Indonesia Mining Student Network – Geopath: Navigating your Career in The Mining Industry
- 2021 – Webinar – SM-IAGI Pertamina University – Nickel Processing Technology (Development of Precious Mineral in Indonesian Technology)
- 2020 – Webinar – Geosoftware Community – Python Data Science Basic Programming Tutorial
- 2020 – Webinar – Geosoftware Community – ArcGIS Pro Desktop Software Tutorial
Publications & Innovation
- Effective Digital Supply Chain (Spatial Analysis) — PT. Esri Indonesia
06 / VISION & MISSION
Vision
To contribute to national mineral development where geological uncertainty is managed. I envision projects where technical evidence, economic reliability , regulatory compliance, and social responsibility lead to reliable and sustainable decisions.
Mission
- Make uncertainty visible through spatial analysis, resource modelling, better reconciliation, and transparent data systems so that teams can manage risk responsibly.
- Connect resource confidence with mine planning, project delivery, downstream requirements, economics, and mineral-investment decisions.
- Build collaborative multidisciplinary teams capable of addressing technical challenges, volatile project situation, and integrative/inclusive thinking.
- Share applied knowledge through professional practice, mentoring, training, and technical writing to support the development of people and the mining industry.