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, as well as 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.


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 with an extremely 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.
Currently, significant research is being done on new applications such as cancer treatments.


Our story 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, residues recovery and environmental compliance. Our different processing plants are located in various areas in South Africa.

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.

Our HEAD OFFICE is 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.




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 has a joint venture company with Harmony Gold. He has served on the Minerals and Petroleum Board of South Africa since February 2015. He is also the founding member of Refilwe Monageng Trading Enterprises, a global industrial company that is a strategic partner to the Commonwealth Enterprise and Investment Council.

Refilwe recently participated in the 2017 Commonwealth Study Conference (CSC) of which HRH The Princess Royal, Princess Anne is 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 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 and 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.


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.


The company’s footprint includes several sites in 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



Our company is in the business of recovering and refining gold and silver, as well as the six platinum group metals: platinum, palladium, rhodium, rutheniuim, iridium and osmium.

Gold sponge drying under infra-red lamps

Our Gold has a minimum purity of 99.5% plus and is sold in sponge form, but can also be supplied as intermediate salts, granules or bars. 


Silver concentrates from mines, metallurgical facilities and consumer and industrial wastes are processed to produce 99,99% silver.
This is subsequently sold to our group company Silverchem to manufacture value added products for a wide range of applications.


Our Platinum has a purity of 99.95% plus and is usually sold in sponge form, but can also be supplied as granules or bars. A range of platinum based compounds can also be supplied, including colloidal platinum. Assay certificates for each batch are available.


Our Palladium is sold with a minimum purity of 99.95% and is available in sponge form, but can also be supplied as granules, bars or intermediate salts. Gauteng Refinery's palladium feedstocks are sourced from a number of sources including process residues, electronic scrap, auto catalysts and scrap printed circuit boards. A range of palladium based compounds such as palladium chloride can be supplied.


Filtering gold bearing slurries


Osmium extraction process using glass reactor vessels

We process, refine and supply Rhodium at 99.9% purity being available in sponge and powder. Assay certificates for each batch are available.


Gauteng Refinery's Ruthenium is sold with a minimum purity of 99.9% plus. It is available in sponge form, but can also be supplied as intermediate salts.


Iridium is sold with a minimum purity of 99.9% plus and is available in sponge form, but can also be supplied as intermediate salts.


Gauteng Refinery is a leading global supplier of Osmium. It has a minimum purity of 99.8% and again assay certificates are available for each batch.


Please contact us for any product queries. You can also learn more about the detailed characteristics of these metals by downloading the document on "Quick Facts for Precious Metals and PGMs" here

Work at the Mintek based processing labs



One of the primary aspects of the business is toll refining. This is the processing, recovery and refining of materials (e.g. concentrates, residues, jewellery scrap, auto catalysts, electronic scrap) that contain gold, silver and the six platinum group metals: platinum, palladium, rhodium, ruthenium, iridium and osmium. This is in general performed on behalf of the owner with recovered and refined metal(s) being returned in a form of their choice.

Gauteng Refinery has no set terms and conditions with agreements being structured to suit individual clients.

A view of Gauteng Refinery’s Mintek site

Each batch of material from a customer is processed individually and retains its identity throughout the process, thus maintaining the integrity of the metal accounting principles, as well as ensuring an accurate and precise metal balance across each batch of material processed.

The company has access to facilities provided by an international service provider that will facilitate the financing of the refining metal inventory and pipeline. This includes a comprehensive range of customised financial services and tools to help Gauteng Refinery protect its margins and manage volatility. Additionally, because Gauteng Refinery has access to an FX pricing platform that can price gold at any time and/or hedge; and with an efficient mechanism for USD/ZAR conversion; the company can provide a more rapid processing and payment pipeline. This mitigates the costs and risks of metal price and exchange rate fluctuations.

Gauteng Refinery’s client base includes corporate organisations such as Anglo American, De Beers, Pan African Resources and Rand Refinery.

Feedstock for toll refining is sourced in a manner which ensures conformance with the Organisation for Economic Co-operation and Development’s (OECD) Due Diligence Guidance for minerals from conflict affected and high risk areas, as well as the requirements of the Responsible Jewellery Council (RJC) and the London Bullion Market Association’s (LBMA) Responsible Gold Guidance.


The term Urban Mining refers to the recovery of precious metals from the processing of and value recovery from materials that originate and have become disposable from the technical era. These include inter alia electronic waste, spent autocatalysts, used X-rays and photographic film.

20 to 50 million metric tons of e-waste are disposed of worldwide every year. In the United States of America, e‑waste is still the fastest growing municipal waste stream. Americans dump cell phones containing over $60 million in gold and silver every year.

Recycling one million laptops saves the energy equivalent of the electricity used by 3,657 homes in the USA every year. It takes 245 kgs of fossil fuel, 22 kgs of chemicals, and 1,5 tonnes of water to manufacture one computer and monitor.

It is estimated that around 80 000 tons of electronic waste is generated in South Africa per year. For every million cell phones that are recycled, 16 tons of copper, 350 kg of silver, 195 kg of gold and 15 kg of palladium can be recovered, yet only 12.5% of all electronic waste is currently recycled.

Several initiatives have been introduced via the Urban Mining Business Unit which involve the recycling of suitable waste streams arising from e-waste, X-rays and spent autocatalysts. All of this has historically been exported for treatment and recycling companies in Europe, the Far East and USA.

The benefits of processing the listed waste streams in South Africa instead have been brought to the attention of relevant government institutions to support the growth of local businesses including waste collectors and to assist local job creation.

Various other waste streams are also treated and recycled including mine residues, tailings and spent catalysts. Gauteng Refinery has long standing associations with many recycling companies and mining houses.

Used computer parts ready for recycling


Our group of companies has over 30 hard earned years of experience in managing by-products, residues and wastes, with the associated environmental and other benefits.

A key part of this has been innovative partnering with Mining and Metallurgical operations for:

Site Clean Ups
Based on an upfront resource map and work plan, materials are extracted from infrastructure, equipment, smelt houses, bag houses, precipitators and other for subsequent precious metals recovery and refining.

On or off site recovery from materials such as dusts, fines, carbon fines, wood chips and slags.

Waste Materials

  • Solid wastes such as crucibles, refractories
  • Liquid wastes such as mine runoff, tailings dam return water, effluents

Gauteng Refinery has proprietary technology to remove contained precious metals down to single figure part per million, whilst also treating effluents fit for discharge in compliance with all legislative, sustainable and moral requirements.

  • Airborne emissions

As with all of the company’s activities, the above is done in close conjunction with Mine Management and Operations Personnel based on full transparency, trust and technical competency.

Gauteng Refinery has rigorous environmental compliance standards. Scrubbers are used to clean emissions


Our customers receive a complete service from Gauteng Refinery. We have developed a step by step refining process to provide you with a best in class service and maximum metal return. From the initial material analysis, we will guide and advise you every step of the way. Strategic alliances with other refineries allow us to source and supply specific precious metals’ compounds that are not produced internally.


With a proud history extending as far back as 1934, Mintek is a leading provider of minerals processing and metallurgical engineering products and services to industries worldwide.

Gauteng Refinery’s site at Mintek was acquired from Harmony Gold and for more than 20 years has been recovering and refining gold and platinum group metals.

The company’s relationship with Mintek began in 2015 and due to this partnership, the company enjoys access to shared resources and facilities through several formal collaboration agreements.

It is a strategic alliance that has benefited both parties and continues to contribute to the success of excellence in product delivery.

Mintek’s submerged arc furnace

Responsible Jewellery Council

The Responsible Jewellery Council (RJC) is an international not for profit, standards-setting and certification organisation for the entire gold supply chain. RJC members commit to and are independently audited against the RJC’s Code of Practice and Chain of Custody Certification for precious metals. Gauteng Refinery is a member of the Responsible Jewellery Council and is working towards conformance and accreditation with the RJC’s CoP, CoC and the principles of the Responsible Gold Guidance.

Proudly South African

The Proudly South African Campaign encourages the South African Nation to make personal and organisational contributions to economic growth and prosperity in South Africa, thereby increasing employment opportunities and reinforcing national pride. Gauteng Refinery is a Proudly South African member.


The eWaste Association of South Africa (eWASA) was established in 2008 to manage the establishment of a sustainable environmentally sound e-waste management system for the country. Since then the non-profit organisation has been working with e-waste handlers to manage e-waste effectively.

Gauteng Refinery has an active interest and concern in e-waste with there being opportunities to establish local businesses focussing on collection and recycling of e-waste to support environmental awareness and responsibility. Large quantities of e-waste are still exported for processing in Europe and the USA, which could easily be processed locally and support local job creation.


The company recognises the vital importance of meeting all customer requirements in a highly competitive market place. We are proud to have sound and long standing relationships with many of our clients and to have had these close associations which are built on trust and dependability.


Our commitment to honesty and integrity has resulted in a company that is held in high regard with not only our clients and business partners, but by our competitors, government and the precious metals industry in general.

It is our policy to only purchase precious metals from legitimate and ethical sources. The metals which we accept have not been associated with corruption, crime, armed conflict, misrepresentation of tax and royalty payments or human rights’ abuse. We will continue to operate our company with honesty and the highest of moral standards in all aspects of our business.

The shareholders, management and staff of Gauteng Refinery will not tolerate nor profit from:

  • Child labour or any form of forced labour
  • Human rights’ violations and abuses
  • Torture, cruel, inhumane and degrading treatment
  • War crimes, genocide

Gauteng Refinery has implemented the above-mentioned policy and appointed a Compliance Officer, who is responsible for overseeing our policy, management systems and due diligence process regarding the purchase of precious metals.

We will require all business partners and suppliers to confirm their commitment and compliance to Gauteng Refinery (Pty) Ltd.’s Responsible Precious Metals Policy.

This Full Policy is available for download here


Gauteng Refinery recognises the imperative to operate according to the principles of zero harm to its people, customers and the environment. It is committed to establishing and maintaining the highest practicable standard of occupational Health and Safety for all personnel. The company has in place a Health and Safety Policy to which all employees must comply and which all employees have signed.. The Full Policy is available for download here.

As part of the company’s obligations, it has in place Health and Safety representatives as well as a Health and Safety committee.

Gauteng Refinery has comprehensive and interactive Health and Safety training programmes which ensure that its employees have a clear understanding of its health and safety practices and procedures. The training programmes include specific external training and are currently being expanded to include occupational health training and routine scheduled medical surveillance and medical counselling.


The company adheres to legislation and ensures compliance with regulations applicable to the industry. We are environmentally conscious and strive to minimise all waste streams. Our Urban Mining initiative promotes recycling of various waste materials in the mining, chemical, automotive and e-waste industries.


GAUTENG REFINERY  has been independently verified in accordance with the Code of Good Practice, issued in terms of section 9(1) of Broad-Based Black Economic Empowerment act 53 of 2003 (Gazetted 11 October 2013).


Gauteng Refinery has established strict policies, procedures and processes to ensure that it conforms to particular standards, frameworks and guidelines. All material at Gauteng Refinery is of known provenance. Systems have been established and implemented to enable an independent third party to verify all stages of processing in order to provide assurance on the veracity and origin of all material.

The company has a code of practice which complies with the regulations and all the requirements of the South African Diamond and Precious Metals Regulator (SADPMR), as well as all the relevant Acts of Parliament in the precious metals arena.

Gauteng Refinery has fulfilled its obligations in terms of the Mining Charter in respect of the broad-based black economic empowerment requirements and achieved its status as a Level 3 Contributor in 2015. Our Verification Certificate can be downloaded here.

We are a member of the Responsible Jewellery Council (RJC) and are working towards conformance and accreditation with its Code of Practice, Chain of Custody and the principles of the Responsible Gold Guidance.

Whilst the company is not a member of the London Bullion Market Association (LBMA), it does conform to the LBMA’s principles contained in the Responsible Gold Guidance.

Similarly, although not a member, Gauteng Refinery adheres to the World Gold Council's Conflict-Free Gold Standard.


We not only respect the stakeholders who have a vested interest in our business, but also those who are affected by where we operate and what we do. As such we consider communities an important part of our stakeholder pool. We undertake a number of corporate social responsibility endeavours focused on historically disadvantaged South Africans.

Our commitment to these initiatives includes:

  • to strive towards compliance with the provisions of the South African Government’s Broad Based Black Economic Empowerment ambitions
  • to commit to investing in education and the development of youth
  • to improve the quality of life of people in the rural communities through fostering awareness of the environment
  • to promote ecological rehabilitation, sound environmental awareness and resource utilisation.

The Zonketina Athletes
The company sponsors soccer and netball teams comprising young, entrepreneurial athletes. Seen here are members of the soccer team. The intention of this contribution is to assist in the upliftment of the youth, as well as providing them with resources and opportunities not easily accessible in the rural area where they live. The team members say that playing sport and belonging to a team gives them motivation and direction.

Internship and learnership programme
Gauteng Refinery offers internship programmes for a limited number of interns approved to conduct their P1 and P2, practical components of their Diploma or Degree.
Similarly, the company also offers learnership programmes which encompass practical, on the job exposure in developing the required skills in the Refinery.
The application processes for these programmes can be downloaded here.

Michele Beaumont – Human Resources Manager
Michele has a National Diploma in Personnel Management, Management Development Programmes, Stellenbosch and Wits Business Schools, an MBA, University of Southern Queensland and is a qualified coach. She has 20 years’ management experience in the corporate environment and joined the company in 2015.
Her areas of responsibility include human resources, recruitment, transformation, business process optimisation, policy construction and refinery operations.


We welcome your feedback and encourage you to contact us if you have any suggestions or enquiries.

Tel: +27 (0) 11 608 1577/ 64/ 74
Fax: +27 (0) 86 542 5247
Email: info@gautengrefinery.co.za

Head Office
Physical Address:
27 High Street
Founders Hill

Postal Address:
PO Box 588