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Gold Diagnostic Leach Test

By understanding the nature of gold deportment with a Gold Diagnostic Leach the likely processing method can be gained early on in flowsheet development. The test can also be applied to process feed streams to troubleshoot reasons for low gold recoveries in an operating environment.

The test works by selectively leaching gold carrier minerals one group at a time and then using a cyanidation leach to recover the gold liberated from those phases.

GSL offers the following gold diagnostic attacks:

Treatment Step Minerals Likely to be Destroyed
NaCN Wash Precipitated Gold
NaCN Free, Liberated, Exposed Gold
Na2CO3 Gypsum and Arsenates
HCl Pyrrhotite, Calcite, Dolomite, Galena, Goethite, Calcium carbonate
HCl/SnCl2 Calcine, Haematite, Ferrites
H2SO4 Uraninite, Sphalerite, Labile Copper Sulphides, Labile Base Metal Sulphides, Labile Pyrite
FeCl3 Sphalerite, Galena, Labile Sulphides, Tetrahedrite, Sulphide Concentrates
HNO3 Pyrite, Arsenopyrite, Marcasite
Oxalic Acid Washes Oxide Coatings