Process for leaching metal sulfides with reagents having thiocarbonyl functional groups

A method for extracting metal comprising:

• extracting at least one metal from a metal sulfide comprising the step of using formamidine disulfide (FDS) for the extracting, wherein the at least one metal includes cadmium.

A method for extracting metal comprising:

• extracting at least one metal from a metal sulfide comprising the step of using formamidine disulfide (FDS) for the extracting, wherein the at least one metal includes nickel.

A method of recovering at least one base metal ion, the method comprising:

• contacting a material comprising at least one base metal sulfide with formamidine disulfide (FDS);
• and
• extracting the at least one base metal ion from the material.