Global Mineral Research

Hydrometallurgy involves the chemical separation of the metals of interest usually by a leach process, followed by purification and concentration of the resulting solution and then recovery of the metals. GMR is experienced with all common leach techniques including heap, pressure, atmospheric, tank/vat, and bioleach. We are also experienced in SART (sulphidization, acidification, recycle, and thickening) for precipitating copper and regenerating cyanide from the leach stream of the gold cyanidation process, as well as various other techniques for purification and concentration of the solution, and final metal recovery by electrowinning and precipitation.


GMR has recently worked on a project involving alkaline sulphide leach – selectively leaching arsenic from copper concentrate to reduce penalties from smelters.