Sulphide Oxidation Typical Albion Process leach test results Low - - PowerPoint PPT Presentation
Sulphide Oxidation Typical Albion Process leach test results Low Oxidation High Oxidation 100 90 80 70 Gold Recovery (%) 60 50 40 30 20 10 0 0 10 20 30 40 50 60 70 80 90 100 Sulphide Oxidation (%) 21 Commercial
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10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100
Gold Recovery (%) Sulphide Oxidation (%)
Low Oxidation High Oxidation
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Albion Leach Slurry Cooling Cyanide Leach Limestone Oxygen NaCN Cyanide Destruct Underflow Thickening Tailings Elution GOLD DORE Loaded Carbon Bulk Pyrite Con Ultrafine grind Barren Carbon
Albion Process Plant
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base of reactor
limestone ring
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neutral pH nature of slurry (304/316 and duplex steels LDX 2101)
mass transfer through combination of agitation power and sparger pressure
modular tanks
tanks that the elements can be shipped in sea containers
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10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100 Gold Recovery (%) Sulphide Oxidation (%)
Feed Type Concentrate Treatment rate 219,000 tpa Gold grade 20.0 g/t Sulphide sulphur grade 40.0% w/w Principle gold bearing mineral Pyrite Albion Process Design Basis Sulphide sulphur oxidation requirement* 70% Sulphide sulphur oxidation rate* 61,320 tpa CIL Process Gold recovery 90.0% Gold production 126,752 oz/y Project Input Costs Power 100 US$MWh Limestone 50 US$/t Oxygen 45 US$/t Weighted average labour cost 50,000 US$/person
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Area Base 70% SOx 600 tpd (US$) ALBION PLANT 38,200,000 $ OXYGEN PLANT 24,500,000 $
TOTAL COST 62,700,000 $
NB:
Oxygen plant is outside Albion Process and Xstrata Technology scope of supply Oxygen plant costs are order of magnitude costs
Fully Installed Albion Process Plant Mechanical equipment Structural Steel Electrical distribution and plant substations Piping, valves, launders Instrumentation and control Concrete, ring beams and bunding Buildings and Architectural Civil Works (assuming level site) EPCM Labour EPCM Expenses Commissioning Labour Commissioning Expenses Insurances Temporary Works First fills and Reagents Spares Contingency Unit Operations IsaMill Fine Grind Leaching Neutral Slurry Thickening Slurry Cooling
Capex costs converted to operating cost (discount rate 12.5%
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NB: Oxygen plant is outside Albion Process and Xstrata Technology scope of supply Oxygen plant costs are order of magnitude costs that will require validation from vendors
Category US$/t con US$/oz Au Dist'n Power (IsaMill) 6 10 7% Power (Rest of plant) 2 3 2% Limestone 45 77 50% Oxygen 29 50 32% Labour 6 10 6% Maintenance supplies & consumables 3 5 3% Total 90 155 100%
Power (IsaMill) 7% Power (Rest
2% Limestone 50% Oxygen 32% Labour 6% Maintenance supplies & consumables 3% Gold price US$/oz 1,000 750 500 Gold equivalent opex oz/y 19,669 26,226 39,339 g/t Au 2.8 3.7 5.6 SOx units % w/w sulphide 28.0 28.0 28.0 g/t Au per % SOx 0.10 0.13 0.20
Opex ~19.7M US$/y ~320 US$/t SOx
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Limestone: US$50 /t Power: US¢10/kWh Oxygen: US$45/t Limestone: US$40/t Power: US¢8/kWh Oxygen: US$35/t Limestone: US$30/t Power: US¢6/kWh Oxygen: US$27/t
Direct Opex Costs 261 US$/t SOx Amorised Capex Costs
185 US$/t SOx
TOTAL
445 US$/t SOx
215 US$/oz Au Discount Rate 12.5% Project Life 10 years Direct Opex Costs 205 US$/t SOx Amorised Capex Costs
185 US$/t SOx
TOTAL
390 US$/t SOx
189 US$/oz Au Discount Rate 12.5% Project Life 10 years Direct Opex Costs 321 US$/t SOx Amorised Capex Costs
185 US$/t SOx
TOTAL
505 US$/t SOx
245 US$/oz Au Discount Rate 12.5% Project Life 10 years