developments in the processing of refractory & complex gold ores

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TREATMENT PROCESSES 6
LOCKED GOLD Iron/Arsenic Sulphides - pretreatment processes include: • Roasting of whole ore or flotation concentrate. • Low pressure intensive oxidation. • Acid or alkaline pressure oxidation of whole ore or flotation concentrate. • Bio-oxidation of flotation concentrate. • Fine or ultrafine grinding of flotation concentrate followed by direct cyanidation or one of the above pretreatment processes. • Heap bio-oxidation of whole ore or flotation concentrate. Copper Sulphides – flotation followed by smelting, roasting or hydromet treatment of concentrate. Non-Sulphide Gangue Minerals – fine grinding of whole ore followed by direct cyanidation. 7
Page 1 and 2: DEVELOPMENTS IN THE PROCESSING OF R
Page 3 and 4: • Ores containing gold locked in
Page 5: Note: covellite solubility is simil
Page 9 and 10: Oxidised or Low Sulphide Ores PREG-
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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