The Kell Process

The economic, sustainable and greener
way to beneficiate metals

KELL Process PROVIDES Higher OVERALL recoveries of precious and base metals,
Lower OPERATING AND CAPITAL cosTs and quicker processing time
while Reducing the industry’s environmental impact


The Kell Process is an unprecedented opportunity to engage in transfomational innovation in metals recovery.


The Kell process addresses key obstacles to sustainable processing of ores and concentrates by:

Increased Productivity and Efficiency

+ Two weeks' processing time from concentrate to metal
+ Higher overall recoveries of precious and base metals
+ Modular plant design

Reduced environmental impact

+ >30% reduction in greenhouse gas emissions + 50% reduction in energy  
+ Minimisation of fresh water usage
+ Removal of global concentrate shipping

+ Dry stacking of tailings

+ Elimination of cyanide in refractory gold recovery

Creating long term sustainability

+ Reduced operating costs
+ Less energy requirements
+ Reduced emissions
+ Higher recovery from mineral reserves

delivering community value and employment

+ Host Nation benefit of in-country refining
+ Creation of local skilled jobs
+ Stimulation of local economy

+Healthier working environment

higher safety standards

+ Cyanide and Mercury free gold recovery
+ Sulfur & Arsenic are safely stabilised

The Kell Process is the benchmark in efficient, low-energy metals recovery with low environmental impact - towards a sustainable carbon-neutral, toxic-free mining operation.


Kell Technology

The Kell Process has been developed for extraction of platinum group metals (PGM), gold, silver and base metals from PGM sulfide flotation concentrates without smelting. The hydrometallurgical process has been successfully demonstrated on several different PGM and polymetallic concentrates, including those from the UG2, Merensky and Platreef in South Africa, Great Dyke in Zimbabwe and several concentrates from North and South America. It has been shown to provide high recoveries (95 to 99%) and selective extraction efficiencies for the key base metals and precious metals, i.e. Pt, Pd, Rh, Au, Ni, Co, Cu.

The KellGold variation is applied to refractory gold, Cu/Au and preg-robbing gold concentrates - enabling production of refined metals at the mine site without the use of cyanide.

The Kell Process is a leap forward in PGM, polymetallic, gold, lithium and base metal concentrate processing technology, by bringing enhanced economic outcomes - including much lower power consumption, efficient processing to metals in a matter of days and a range of environmental benefits.


The Benefits

  • No requirement to smelt concentrates - minimizing CO2 and SO2 emissions
  • Can be located next to the flotation concentrator for on-site beneficiation of minerals
  • Reduced costs with increased recovery and revenue compared to smelting contracts
  • Reduced energy requirements, electricity and water consumption
  • The Kell Process can process a range of sulfidic concentrates
  • Final metal products tailored to users marketing requirements
  • Reduced carbon emissions and carbon tax liability
  • Environmentally responsible by reducing global transport and shipping of concentrates to smelters
  • Socially responsible by facilitating more skilled employment at the mine sites
  • Allows for dry stacking of tailings and minimisation of fresh water usage
  • Zero toxic waste

The clean

•Reduced greenhouse gas emissions when compared with smelting
•Cyanide-Free gold recovery
•Sulfur & arsenic are safely stabilised as inert
compounds and not released as noxious emissions
•Much lower power consumption
•Reduced water consumption


In the Media



Keith Liddell explains the Kell Process to Mining Weekly Online and why the technology will change the way the mining industry thinks about processing.

Mine Africa
June 2018

The Hon. Winston Chitando, Minister of Mines and Mining Development for the Republic of Zimbabwe led a delegation of senior government officials and business leaders from the Chamber of Mines to Toronto to make the case for Zimbabwe's attractiveness as a mining investment destination.

May 2017

Invention set to solve some platinum woes. This new technology to produce platinum group metals (PGMs) will be rolled out in SA and Zimbabwe, answering a demand for greater beneficiation of these precious and industrial metals and unshackling junior miners from the major companies.

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