Selinsing Gold Mine started commercial production in September 2010 and in 2019 fully replaced gold inventory with sulphide gold resources and reserves for the next six years life of mine with upside potential. The Selinsing Gold Mine has produced 285,413 ounces for $383.4 million in revenue and cash cost of $473 up to September 30, 2018. The plant capacity is 1.0 million tpa.
Production Data
| Selinsing Gold Mine Production | Year ended June 30 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | |
| Ore mined (thousand tonnes) | 662.3 | 740.9 | 501.9 | 882.2 | 494.1 | 421.8 | 423.0 | 193.6 | 298.8 | 166.9 |
| Ore processed (thousand tonnes) | 272.1 | 352.0 | 364.7 | 938.5 | 1,019.0 | 954.2 | 992.1 | 847.4 | 891.9 | 934.8 |
| Average ore head grade (g/t Au) | 3.08 | 4.31 | 4.24 | 2.07 | 1.31 | 1.45 | 0.88 | 0.8 | 1.03 | 0.8 |
| Process recovery rate | 58.70% | 92.90% | 93.70% | 87.00% | 75.87% | 82.40% | 67.4% | 58.80% | 72.00% | 69.50% |
| Gold production(1) (ounces) | 13,793 | 44,438 | 44,585 | 52,982 | 35,983 | 36,473 | 18,155 | 12,845 | 22,854 | 15,763 |
| Gold sold (ounces) | 13,793 | 40,438 | 36,938 | 57,905 | 37,670 | 36,500 | 23,150 | 12,700 | 14,750 | 16,505 |
| Financial results | ||||||||||
| Gold sales (US$’000) | 16,316 | 56,627 | 61,709 | 91,277 | 48,583 | 44,838 | 23,595 | 15,719 | 19,250 | 20,993 |
| Per ounce data | ||||||||||
| Cash cost per ounce (US$/ounce) | 216 | 242 | 306 | 400 | 613 | 587 | 606 | 936 | 753 | 713 |
| Average spot gold price, US$/ounce | 1,089 | 1,372 | 1,673 | 1,573 | 1,296 | 1,224 | 1,168 | 1,238 | 1,305 | 1,262 |
| Average realized gold price(2), US$/ounce | 1,183 | 1,400 | 1,671 | 1,576 | 1,290 | 1,228 | 1,157 | 1,238 | 1,305 | 1,260 |
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Oxide Production and Plant Process
Run of mine (ROM) ore is delivered to the crushing circuit where it is crushed, screened added to the crushed stockpile (COS)Crushed ore is conveyed to the primary ball mill for grinding. Primary mill discharge is is split between the gravity circuit and the secondary ball mill. The Knelson concentrator recovers gold as a gravity concentrate which is then fed to the Acacia Reactor. Intensive cyanide leaching recovers gold into solution which is then directed to the electrowinning cells. Gravity tailings and intensive leach tailings are returned to the milling circuit. Secondary mill discharge is pumped to the primary mill discharge hopper and pumped back to the classification cyclones. The leach circuit features a total of nine leach / carbon in leach (CIL) tanks. The gold is leached from the ground slurry and adsorbed by the activated carbon. Loaded carbon is harvested from the second leach tank and pumped to the acid wash tank. Hydrochloric acid is used to remove any carbonate minerals and the carbon then flows into the elution column where a hot caustic and cyanide solution is added at pressure to initiate the elution of the gold from the loaded carbon. High tenor gold solution then circulates to the electrowinning cells where gold is deposited. The electrowinning cells are cleaned on a regular basis and the resultant gold dust smelted into bars and shipped to the gold refinery.
Oxide Plant Process Diagram
