developments in the processing of refractory & complex gold ores

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INSOLUBLE OR SLOW LEACHING GOLD MINERALS • Roasting of flotation concentrate followed by cyanidation. • Alkaline chlorination leaching of flotation concentrate followed by cyanidation. • Low pressure cyanidation of flotation concentrate. 8
Oxidised or Low Sulphide Ores PREG-ROBBING ORES • Maximization of gold recovery by gravity plus intensive cyanidation of concentrate. • Application of CIL with high carbon concentration. • Addition of kerosene or other substance to blanket the pregrobbing material followed by CIL or RIL (not subject to fouling). • Chlorination to deactivate the carbonaceous material. • Roasting to burn off the carbonaceous material. Ores with Gold Locked in Sulphides • Roasting of whole ore or flotation concentrate to burn off the carbonaceous material and oxidize the gold bearing sulphide . • Pressure oxidation to deactivate the carbonaceous material and oxidize the gold bearing sulphide. • Rejection of carbonaceous material in flotation circuit if included. 9
Page 1 and 2: DEVELOPMENTS IN THE PROCESSING OF R
Page 3 and 4: • Ores containing gold locked in
Page 5 and 6: Note: covellite solubility is simil
Page 7: LOCKED GOLD Iron/Arsenic Sulphides
Page 11 and 12: CYANIDE AND OXYGEN CONSUMING ORES R
Page 13 and 14: ROASTING OF FLOTATION CONCENTRATES
Page 15 and 16: BIO-OX OF FLOTATION CONCENTRATE For
Page 17 and 18: GRAVITY RECOVERY MAXIMIZATION, KERO
Page 19 and 20: SEQUENTIAL HEAP LEACHING For Cyanid
Page 21 and 22: PROCESS DEVELOPMENT 21
Page 23 and 24: ALBION PROCESS FLOWSHEET Run of Min
Page 25 and 26: GEOCOAT PROCESS • Developed by Ge
Page 27 and 28: GEOCOAT FACILITY, AGNES GOLD, SOUTH
Page 29 and 30: FOSTERVILLE CARBON MOVEMENT FLOWSHE
Page 31 and 32: BARRICK THIOSULPHATE LEACHING PROCE
Page 33 and 34: THIOSULPHATE DEMONSTRATION PLANT LA
Page 35 and 36: NEOMET PROCESS (CONT.) • Gold is
Page 37 and 38: NEOMET MINPLANT Ref: Neomet Paper,
Page 39 and 40: PRO FLOWSHEET Ref: Process Research
Page 41 and 42: GEDABEK RESIN-IN-SOLUTION PLANT Ref
Page 43 and 44: REFERENCES • Dunn, R., “Challen

developments in the processing of refractory & complex gold ores

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