Gauteng Refinery is part of a group of companies which has been active for over 30 years in precious metals beneficiation throughout Africa.
It is in the business of recovering and refining gold and silver, and the platinum group metals: platinum, palladium, rhodium, ruthenium, iridium and osmium.


We are a technology driven, proudly African organisation maximising the African continent’s precious metals supply chain from source to end user in a responsible and sustainable manner.


Our mission is in unlocking opportunity in the precious metals value chain.


We believe that in order to operate in a sustainable and responsible manner, we must live our values every day. They are defined as follows:


Because of our firm belief in reliability, we are confident that all our stakeholders can be assured of a relationship built on mutual trust and respect. We know our products and services lend credence to this fact.


We perform without any hidden agendas or conditions. We make available all relevant information required for collaboration, cooperation and collective decision making.

Technical Excellence

We provide technical excellence through our qualified team of engineers and chemists who are focused on providing quality and innovative products. We also ensure best practice in all our processes (engineering, refining, recoveries, environmental).


The metal is used to produce very hard alloys for fountain pen tips, instrument pivots, gramophone needles and electrical contacts.
Osmium is the heaviest metal known to man, harder than diamond and it has a very high melting point of 3,033 degrees centigrade.
In addition to osmium, we also synthesise osmium tetroxide (OsO4), which is predominantly used in electron microscopy as a stain to add contrast to digitally scanned images.
There is also currently significant research on new applications such as cancer treatments.


The story of our history introduces the types of services and products we offer and the evolution of our technical experience and expertise. It is through the history of a company older than 30 years that trust and transparency have developed, have become of paramount importance and are maintained to this day.

Our services include refining of precious metals and precious group metals, toll refining, urban mining initiatives, and residues recovery and environmental compliance. These are undertaken at our different processing plants which are located in various areas in South Africa.

Our HEAD OFFICE is based in the beautiful grounds of a national heritage site in Founders Hill, Modderfontein, Johannesburg, South Africa

Main operations site in Johannesburg

GAUTENG REFINERY specialises in the recovery and refining of precious metals. Our precious metals refinery offers a comprehensive range of refining techniques to recover gold and silver and all six platinum group metals. All metals we supply are purified to 99.9% plus purity; and sold either as sponge, granules, bars or intermediate salts, depending on customer requirements.

Through our group company, SILVERCHEM we manufacture a wide range of value added silver products. These include, but are not limited to, silver nitrate, silver sulphate, silver coat and anodes.
In addition, Silverchem markets various platinum and palladium salts on behalf of Gauteng Refinery.


The company’s footprint includes several sites in the Gauteng and Mpumalanga provinces of South Africa and has an increasing presence in a number of African countries.
Noteworthy is the fact that Gauteng Refinery sells its products and services throughout the World.

The Jaw Crusher at our Evander operations


Gauteng Refinery defines its stakeholders as clients, government, regulatory bodies, investors, industry players, employees, suppliers and communities.

The company actively engages all of the aforementioned during the course of its daily business and believes that relationship building and management are key to fuelling the sustainable future of the company and its activities.

We are committed to protecting the interests of stakeholders through communicating our business practices and policies and by operating with trust, transparency and in a responsible and sustainable manner.




Rob Heather – Managing Director and Founder
Rob has a B.Sc. Chemical Engineering and Master of Business Administration from the University of Cape Town.

His group of companies has been active since 1985.

Rob started his career as a plant metallurgist at Anglo American Corporation and throughout his career has gained extensive knowledge and experience in metallurgy and precious metals beneficiation.

Lindani Mthwa is the Co-Founder and Executive Chairperson of Siyanda Resources, a resources investment company.

The Public Investment Corporation, a registered financial services provider, is wholly owned by the South African Government and owns a 30% share in Siyanda Resources.

Siyanda Resources operating as Siyanda Refining Services (Pty) Ltd became an equity partner of Gauteng Refinery in 2015 and has a 20% ownership in the business.

Piers du Plessis – Director
Piers spent over 20 years at Anglo Platinum in metallurgical operations and process design, is a member of the South African Institute of Mining and Metallurgy (SAIMM) and a member of the Mine Metallurgical Managers’ Association of South Africa (MMMA).

Refilwe Monageng is an Executive Director of White Rivers Exploration (WRE), which is a joint venture company with Harmony Gold. Refilwe has served on the Minerals and Petroleum Board of South Africa since February 2015.

He recently participated in the 2017 Commonwealth Study Conference (CSC) of which HRH The Princess Royal, Princess Anne, President and Patron. CSCLeaders assembles exceptional leaders from across the Commonwealth to tackle challenges, build global relationships and develop the cultural intelligence needed by the leaders of tomorrow

Refilwe is also an investor in Gauteng Refinery.

Peter Moravec – Financial Manager
Peter joined the Group in 2014. He previously held similar financial positions mainly in the mining sector.

Peter has a B.Compt and completed his Articles at the beginning of his career.

He has also taken on the responsibility of Contracts Manager with the mines.

Geoff Skelton – Technical
Geoff is a Chemical Engineer with 30 years’ experience in senior management and process design in the platinum refining industry. Geoff has a B.Sc (Hons) in Chemical Engineering from Exeter University and is a leading authority on Platinum Group Metals Extractive Metallurgy.

Geoff provides input on all technical aspects of refining processes for PGMs, gold and silver. He has a wide knowledge of processing practices for many other metallic elements including rare earths, uranium, selenium, tellurium amongst others.

Chris Horsley – Sourcing Manager
Chris is an extractive metallurgist by profession and spent the first 15 years of his career working for Anglo American running metallurgical facilities.

In 1996 Chris transferred to Rand Refinery where he held various senior management positions in operations, marketing and sourcing and was part of the Executive Team for a number of years.

Chris was also part of the responsible gold team at the World Gold Council who compiled the Conflict Free Gold Standard.

Carl Homveld – Business Unit Manager/ Sales and Marketing Manager
During his first year of employment at Armscor he received a bursary to study chemistry which soon became his passion.

During this time he held various executive management positions including Managing Director at a German multinational where he worked for 21 years.