Abstract: Methods for recovering gold from a refractory gold ore and concentrate are described. The method can include leaching the refractory gold ore and concentrate with the alkaline reagent under ambient or near-ambient conditions and a subsequent gold complexation. The method can optionally include separating a gold-containing leachate from a gold-unlocked solid residue obtained during the leaching step and performing a subsequent complexation on the gold-unlocked solid residue and optionally gold complexation on the gold-containing leachate. These methods can increase the gold recovery compared to conventional methods.
Abstract: A process for recovering a precious metal from ore includes adding process water containing thiocyanates to ore particles to obtain a pulp. The pulp having a basic pH is contacted with an oxidizing gas containing ozone; and the pulp is contacted with cyanide. Contacting the pulp with cyanide can include adding cyanide subsequently to contacting the pulp with the oxidizing gas containing ozone.
Type:
Grant
Filed:
November 3, 2014
Date of Patent:
August 2, 2016
Assignee:
COREM
Inventors:
Benoit Levasseur, Eric Proulx, Caroline Olsen