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At Peacocke & Simpson, we place emphasis on gravity recovery. In addition to being more environmentally friendly and sustainable, gravity recovery is also more economical than applying costly chemistry to the mineral recovery process. As such, Peacocke & Simpson is committed to the environment and to helping our valued clients achieve higher yields at less cost.

chemical recovery

When chemical recovery is necessary, we pride ourselves in having state of the art equipment and expertise to conduct leaching, flotation and other chemical testing and process testing procedures to the highest quality. This is either done independently, in comparison with gravity recovery, or as a peripheral or downstream process with gravity recovery, depending on the needs of each individual client.


We are proudly associated with ​FLSmidth (Knelson Technologies) – acknowledged world leader in enhanced gravity recovery equipment – and provide valuable R&D services to the company, in addition to being the trusted testwork partner of APT (Appropriate Process Technologies), ConSep and Rocklabs.


Peacocke & Simpson is committed to the continuous enhancement of mineral processing solutions and the development of the mining industry not only in Africa, but throughout the world.

Thanks to P&S for a job well done on the Singida metallurgical testwork program. Shanta can now move forward on the BFS with a great deal of confidence, knowing that the gravity and leach test work have been completed in both a comprehensive and professional manner.

Wally Channon, Technical Manager, Shanta Gold

I always contact Pete (of Peacocke & Simpson) when I encounter a problem with gravity or intensive leach because (1) he has a lot of experience and strong technical ability, (2) he is always able to point us in the right direction, (3) he genuinely cares about the equipment, its operability and maintenance, and (4) he is the best equipment service provider of any that I have encountered.

Karen Tempel, Chief Metallurgist, Newmont Mining Corporation

Peacocke & Simpson provide outstanding technical input into identifying opportunities for optimizing gold recoveries in our business. Their ability to understand the challenges in developing world environments and to provide workable solutions was outstanding.

Mike Marriott, CEO, DRD Gold

At Buzwagi Mine, we have been impressed by the quality of service and dedication demonstrated by our gravity equipment vendors. They have been totally committed to getting the gravity equipment commissioned in a timely manner. Successful commissioning of the Knelson Concentrators and ACACIA Reactor has ensured our first gold production is on schedule.

Julie Shuttleworth, Process Manager, Barrick Gold

The KC 48 Concentrator installed on one of our operations has resulted in a three fold increase in gravity gold recovery, which has translated to a 3% increase in overall plant recovery. We are so happy with the performance of the KC 48, and plans for the purchase of another unit for our second biggest operation are at an advanced stage.

Ken Mekani, Group Metallurgical Manager, Metallon Gold

Mr Pete Simpson was assigned by Consep for the final stage of our Acacia Reactor CS250 installation and commissioning. With him by our side, everything went smooth and easy, not only does he know his thing but he has a great facility to transmit his knowledge. After the commissioning, he was available to give us advice, always with a smile. We sure will use the services of P&S in the future, they already did our EGRG tests in 2014 which led to this Knelson/Acacia installation… Many thanks Pete!

Claude PelletierGeneral Manager, Guiro Gold Mine, Burkina Faso

Meet the team

portrait of Barney Moyo



Barnabas Moyo brings more than 25 years of experience in minerals testing and minerals processing to our team. An associate chartered engineer and member of the Institution of Mining & Metallurgy, Barnabas ensures the satisfaction of all Peacocke & Simpson clients, both pre-existing and potential.

Barnabas also focuses on the research and development of minerals processing design, and in that capacity develops testwork programs suited to the individual needs of our clients. Barnabas generates testwork reports, analyses and other data in order to help make the crucial decisions that ultimately lead to our clients' successes in the mining industry.

portrait of Stanley Makonde



Excellence is in the details, and in Stanley Makonde Peacocke & Simpson has a key player who pays careful attention to every fundamental element of any project that comes our way. Stanley, who has more than 25 years of practical experience in mineral testing, mineral processing and administration, is our manager of logistics, estimation and installation, in addition to playing a key role in driving mineral testing and process testing sales for anything from gold plants to asbestos mines.

Stan provides estimates for clients on plant and equipment costs, procures necessary hardware for our sites, supervises site development and oversees logistics on incoming samples, in order to ensure that each and every client's specific needs are met.

portrait of Patrick Chiropa



With a team of 15 lab technicians working alongside him, Patrick Chiropa is an essential member of the Peacocke & Simpson roster. Patrick and his team are a busy lot, working on up to 20 testwork programs at a time, and delivering results in record time-frames.

Patrick also coordinates test phases and results, and communicates with clients on the progress of their projects.

Patrick also has over 25 years of experience in the mineral testing and process testing industry, and holds a Diploma of Minerals Processing as well as a Diploma in Mineral Resources Management.

portrait of Pete Simpson



For more than 30 years, Peter Simpson has applied his expertise as a chartered engineer to find solutions for the mining and metallurgy industry. His practical approach to minerals processing allows him to thoroughly scrutinize projects in order to best meet the budgets and needs of Peacocke & Simpson clients, in addition to gaining him the respect of his peers and associates, the world over.

Peter's accomplishments include the development of an interactive model that allows a client to predict platinum flotation plant performance by selecting various permutations and combinations of reagent types and dosages from 56 separate bench tests.

Peter is a also a long-standing member of the Institution of Mining & Metallurgy

protrait of Kevin Peacocke



With a lifetime of experience in minerals processing, Kevin Peacocke is a leading authority in mining and metallurgy.

His focus at Peacocke & Simpson is research and development, where his creativity, enthusiasm and intellect drive new projects for our clients and the industry as a whole.

Several years ago, Kevin conceived and developed the gravity/heap leach hybrid mineral testing process. This solution is now used globally in the extraction of gold and other minerals from ore.

A chartered engineer, Kevin holds a B.Sc. from the University of Witwatersrand in South Africa and a Rand Assayer's Certificate of Competency from the South African Institute of Assayers and Analysts.

Kevin is a also a long-standing member of the Institution of Mining & Metallurgy.

Testwork programs completed
Gravity circuits commissioned
Days typical turnaround
Years combined experience

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