US 12,065,714 B2
Method for carbon-catalysed thiosulfate leaching of gold-bearing materials
Oscar German Olvera Olmedo, Vancouver (CA); and Daniel Feliks Raphael Domanski, Vancouver (CA)
Assigned to Barrick Gold Corporation, Toronto (CA)
Filed by Barrick Gold Corporation, Toronto (CA)
Filed on Mar. 16, 2023, as Appl. No. 18/122,279.
Application 18/122,279 is a continuation of application No. 16/748,523, filed on Jan. 21, 2020, granted, now 11,639,540.
Claims priority of provisional application 62/819,005, filed on Mar. 15, 2019.
Claims priority of provisional application 62/794,887, filed on Jan. 21, 2019.
Prior Publication US 2023/0313336 A1, Oct. 5, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. C22B 11/00 (2006.01); C22B 3/42 (2006.01)
CPC C22B 11/04 (2013.01) [C22B 3/42 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A process, comprising:
a) providing a particulate carbon-based material comprising one or more of activated carbon, activated charcoal, coke, hard carbon derived from at least one of coconut shells and elemental carbon, a calcined resin, and mixtures thereof;
b) providing a precious metal-bearing material;
c) contacting the precious metal-bearing material with the particulate carbon-based material, thiosulfate, an anion exchange resin, and an oxidant to form a slurry comprising a slurried precious metal-bearing material, wherein a weight ratio of the precious metal-bearing material to particulate carbon-based material is more than 125:1; and
d) leaching a precious metal from the slurried precious metal-bearing material to form a leached precious metal-bearing material, wherein the anion exchange resin has a greater affinity for the leached precious metal than the particulate carbon-based material.