Pre-Feasibility and feasibility studies:

We conduct pre-feasibility and feasibility studies for extensions to existing open pit operations and we evaluate the feasibility of new and/or proposed open pit operations.

We integrate with Mining House Project Teams during any planning stage, whether it is scoping, pre-feasibility or feasibility studies.

Mine Optimization:

We provide open pit optimization services (using industry trusted software packages), as part of our mine design and scheduling services. We use our open pit mine optimization capabilities to assess whether projects should progress to a pre-feasibility study.

We furthermore do mining trade off studies to determine the most financially viable open pit mining method and production schedule for any ore body. We also optimize stockpile schedules to minimize re-handling and logistical challenges.

Mine Design and Scheduling:

We provide Mine Design services within a Project Team environment, in the sense of Mining Engineering and Mine Design. Our services include long term mine design and scheduling, short term mine design and scheduling and reserve reconciliation.

In addition, we optimize blending schedules in long term and short term applications. Our deliverables include the provision of all data in three dimensions together with specific bench plans indicating the mining and pushback sequence required to achieve the set production targets.

ABGM also offer skills development services for design and scheduling applications to assist mines with their sustainable skills development programs within the Mineral Resource Management (MRM) framework.

Resource to Reserve:

We provide a thorough Resource to Reserve solution with a high degree of intellectual analysis. Geotechnical consulting services and Geotechnical modelling (rock fragmentation optimization and slope optimization).




West End Office Park

Building C

3rd Floor

246 Hall Street 

Die Hoewes Ext 286


Gauteng, South Africa

AB Global Mining



Tel: +27 12 644 1199/81

Fax: +27 12 644 1185


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Devendra Vyas

Devendra Vyas

Managing Director and Principal Mining Engineer | B.E. (Mining Engineering), MSAIMM, MECSA

Mr. Vyas is a mining engineer with approximately 18 years’ experience in geological modelling, mining engineering, strategic mine planning, due diligence, strategic business planning, and project management.

He is the principal shareholder of the ABGM Group (South Africa and India). He commenced his career with Hindustan Zinc Limited (India) as Engineer-Mines and later joined Datamine International Ltd. (India), Ararat Gold Recovery Company (Armenia), Konkola Copper Mines Plc (Zambia), Datamine South Africa, CAE Mining Africa, and UK.

Mr. Vyas is a Competent/Qualified Person for Mineral Resources in several commodities, particularly base, and precious metals.

Ettienne Oosthuizen

Ettienne Oosthuizen

Operations Manager and Principal Mining Engineer | B.Tech Mining Engineering, MSAIMM

Mr Oosthuizen has over 18 years of experience, the first 10 years being spent working for AngloGold Ashanti’s deepest underground gold operation at Mponeng Mine.

He joined ABGM South Africa in 2011 to further his expertise in the mining engineering industry and has since been involved in various underground and open pit projects and specialising in hard rock metal and coal opencast and underground projects.  He is actively involved in the technical management of projects with regards to mine optimisation and tactical planning at various operations in South Africa and abroad.

His expertise includes project management, mine consulting, pre-feasibility studies; financial modelling, mine design and LOM planning/scheduling and open pit optimisation. He has extensive knowledge in planning software platforms for mine planning, design and scheduling including NPVS/Whittle and Datamine Studio platforms.

William Gillespie

William Gillespie

Principal Mining Engineer | Nat. Diploma Mining – EUR Eng – CEng – FIM

Mr. Gillespie has over 50 years of comprehensive mining operational and planning experience. He commenced his career with British Coal in Scottish Division and later went to the Zambian Copper belt where he held senior positions, both technical and operational, in surface and underground copper/cobalt mines. Bill moved to South Africa with McAlpine Mining & Civils as Manager Mining involved in owner and contract mining of Opencast Coal and Base Metals progressing to Managing Director McAlpine SA.

Subsequent to the sale of McAlpine mining interests to Gencor, Bill joined Trans Natal as Senior Manager Inland Coal operations and marketing. Gencor seconded Bill to their Australian business unit as Manager Coal Development. He subsequently became General Manager Billiton, Australasia region responsible for exploration, acquisitions and business development after Gencor’s reverse takeover of Billiton.

André van der Merwe

André van der Merwe

General Manager | Grad. Dip. Eng. (Mining), BSc (Hons) Geophysics, Pr. Sci. Nat. FGSSA

Mr. van der Merwe has 30+ years of hands on experience in the minerals industry with insightful knowledge in the disciplines of geology, geophysics, exploration, mining, project management, project development and mineral economics.

He has completed many Competent/Qualified Person technical reports, due diligence reviews and mineral asset valuations covering a wide range of mineralisation styles. He also has been Technical Consultant/Advisor/Owner’s Engineer for successful listings on FTSE, AIM, TSX, ASX and JSE, as well as institutional and private fundraisings. André has managed Prefeasibility and Bankable Feasibility Studies on several mining projects.

He has extensive experience across the metal, ore and gemstone categories and has worked for mining organisations across Africa, the Americas, Eastern Europe and Australia.

Pieter Groenewald

Pieter Groenewald

Head - Geotechnical Services| MSAIMM, MSANIRE

Mr. Groenwald has 24 years of professional experience in various Rock Engineering and geotechnical-related projects. He has practiced as a rock engineering specialist for various Mining Companies (Goldfields, AngloGold Ashanti, Harmony Gold, Kalgold, Lanxess, and Tharisa) as well as Consulting Companies (Middindi, Nostrada, and Rhimak).

He served as a researcher on several projects for the CSIR (Seismicity on Platinum Mines – Pillar Failures; Trigger response for fall of ground predictions on Platinum Mines; Stress-induced fracturing around panels on deep level mining (Lead and Lag Project).

His specialist skills include consulting to the mining industry in rock engineering, geotechnical and mining disciplines; solving mine design and rock engineering problems using experience, numerical models and mathematical equations.

Colin Little

Colin Little

Head- Mining Services | NHD Mine Eng | BTech Mine Eng | Prince2 Foundation | MMC

Mr. Little has over 17 years Mine Engineering experience from Mine Planning, Mine Production, Supervision, Project Management both Open Pit and Underground and has served in various roles at major consultancy and mining houses worldwide.

Core Skills include - local and international operational and consulting experience in open pit and underground (both mechanised and conventional), doing Project management, mineral resource management, production planning, mine designing, operational and capital cost estimates, cost modelling, mine closure and consulting by use of an extensive OEM database and Cost Engineering models.

Phil Gilbert

Phil Gilbert

Senior Project Manager | NHD-Mine Surveying, MDP-Mine Management

Mr. Gilbert is qualified in business management and mine surveying with extensive experience in the mineral extraction industry particularly in contract management and mineral resource management.

A pragmatic, analytical and logical person with good interpersonal skills with a sound understanding of the financial and technical constraints involved in large mining operations.  His varied skillset and experience promotes and enables communication across disciplinary and departmental boundaries; and has proven project management skills in areas such as tender preparation, mining operations, systems testing, and system implementation.

More recently Philip has been consulting to various mining contractors in South Africa and Australia. Philip recently worked as Principal Mining Consultant for MineRP in Brisbane.

Richard Gawthorpe

Richard Gawthorpe

Principal Mining Engineer | B.Sc. Mining Engineering, SAIMM

Mr. Gawthorpe has over 30 years of experience including open pit optimisation, design, and long/medium-term scheduling, resource to reserve conversion, due diligence, and technical reviews. He has been the key role player in mine planning, mine engineering, and as a consultant on many multi-disciplinary teams.

He has served as principal planning and mining engineer for Anglo-American, mine planner and mining investment analyst for Goldfields.

As a consultant, Mr. Gawthorpe has not only consulted on international projects for a diverse range of clients and mining projects but has also served as General Manager of a consulting practice.

Jevan Jooste

Jevan Jooste

Senior Mine Planner | 2nd Year B.Tech Mining Engineering

Mr. Jooste has over 10 years of mine planning experience including open pit and underground mine design, block cutting, sequencing, and production scheduling. He has delivered several feasibility projects on time such as Gamsberg open-pit zinc, Prieska copper-zinc, Thaba open-pit chrome.

Ondrej Zeeman

Ondrej Zeeman

Senior Mine Planner | 2nd Year Mining Engineering

Mr. Zeeman has over 10 years of mine planning experience including open pit and underground mine design, block cutting, sequencing, and production scheduling.

He is the key role player for the tactical mine planning at Harmony Gold’s Kalgold open-pit mining operation.

Pieter Potgieter

Pieter Potgieter

Mine Planner | NDMIN

Mr. Potgieter is a Mining Engineer specialising in Mine Planning, Block Model manipulation and Data Modelling.

He proficient in Excel, Hazard Trackers used in compliance with the DMR and Datamine solutions. Previous experience includes Mine Planning at Ukwazi, Junior Design Engineer at Sound Mining and assisted Mine Planning at Pilanesberg Platinum Mines (PPM).

Tendai Mapeta

Tendai Mapeta

Geologist and Mine Planner | B.Sc. Geology Engineering

Ms. Mapeta is a geologist with over 5 years of experience. Her expertise includes open pit mine design, block cutting, and draughting. She has also been instrumental in various geological modelling and technical reporting projects.

Candice Willemse

Candice Willemse

HR Manager and Project Secretary

Ms. Willemse is the office manager and is responsible for assisting the directors of the company with the smooth functioning of the company. She is also responsible for human resource management and project administration