1. Recovery of gold from thiourea, thiocyanate or thiosulfate solutions by reduction - Precipitation with a stabilized form of sodium borohydride;Awadalla;Randol, Squaw Valley,1990
2. Gold refining by solvent extraction- the Minataur™ Process;Feather;J. S. Afr. Inst. Min. Metall.,1997
3. Gallagher, N.P., 1987. Interaction of gold cyanide, thiocyanate, thiosulfate and thiourea complexes with carbon matrices. M.Sc. Thesis, University of Nevada, Reno.
4. Affinity of activated carbon towards some gold (I) complexes;Gallagher;Hydrometallurgy,1990
5. Gefvert, D.L., 1994. Solvent extraction of precious metals with hydroxyquinoline and stripping with acidified thiourea. U.S. Patent 5,284,633.