Overview
| Stage | Preliminary Economic Assessment |
| Mine Type | Open Pit |
| Commodities |
|
| Mining Method |
|
| Mine Life | 8 years (as of Jan 1, 2020) |
Source:
The Mother Lode Project is 100% controlled by Corvus Gold Nevada Inc. (“CGNI”), a wholly owned subsidiary of Corvus Gold Inc.
Jan. 18, 2022 (GLOBE NEWSWIRE) -- AngloGold Ashanti Limited (“AngloGold Ashanti”) (JSE: ANG, NYSE: AU) and Corvus Gold Inc. (“Corvus” or the “Company”) (TSX: KOR, NASDAQ: KOR) are pleased to announce the successful completion of the previously announced plan of arrangement under the Business Corporations Act (British Columbia) (the “Arrangement”) between Corvus, 1323606 B.C. Unlimited Liability Company (the “Purchaser”) and AngloGold Ashanti Holdings plc (the “Guarantor”). The Purchaser is an indirect wholly owned subsidiary of AngloGold Ashanti and the Guarantor is a direct wholly owned subsidiary of AngloGold Ashanti.
Contractors
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Deposit Type
- Carlin-type
- Sediment-hosted
- Volcanic hosted
Summary:
Deposit Type
Mineralization at MLP most closely resembles Carlin-type sediment-hosted gold systems of northern Nevada. The Mother Lode deposit model includes structurally and stratigraphically-controlled disseminated sulphide and oxide mineralization hosted in primarily in Tertiary sedimentary rocks and rhyolite porphyry dikes. Paleozoic sedimentary rocks comprise a smaller volume host in proximity to dikes and the basal Tertiary unconformity. Tertiary volcanic rocks and debris flow breccias are also mineralized at Mother Lode. Alteration types associated with gold mineralization include passive decalcification and illite-pyrite alteration. Unique features of Mother Lode-style mineralization compared to typical Carlin-type deposits include: the association with fluorine, the significant volume of mineralization that is rhyolite porphyry dike-hosted, elevated tellurium and bismuth, and the generally passive, innocuous, very low-silica nature of the mineralization. Carlin-type gold deposits are generally known to form at depths of >2 kilometers, at temperatures between 180-240oC. Mineralization at Mother lode may have formed at depths of 500-1000 meters or less, and at temperatures <240oC (Weiss, 1996).
Mineralization
Mother Lode is characterized as a sediment, intrusive, and locally volcanic-hosted disseminated gold deposit. Mineralization most closely resembles Carlin-type sediment-hosted gold deposits of north-central Nevada. The Mother Lode deposit f ........
Summary:
The proposed mining method is conventional open pit mining. Mineralized material and waste would be drilled and blasted, then loaded into 227-t payload haul trucks with 34 m3 bucket capacity shovels. The loading and haulage fleet would be supported by track dozers, motor graders, and water trucks. Waste would be hauled to the Waste Rock Management Facility (WRMF) located on Corvus controlled lands. Mill sulphide resources would be hauled to the mill stockpile while run-of-mine oxide (ROM) resources would be hauled and placed directly on the heap leach pad.
The proposed mining operation is owner operated equipment.
Overall pit slope angles of 55° were used in the LG runs. Dilution was not accounted for in the optimization for this preliminary design exercise.
The mine production schedule focused on providing the 8,200 tpd of sulphide mill feed. Adjustments to the grade streaming schedule waste forecast were made to smooth the overall mine equipment demand. Approximately 5.1 M tonnes of sulphide material mined and stockpiled at Corvus’s North Bullfrog Project (NBP) were included in the mill feed schedule to balance the mill throughput. Costs for shipping this material from the NBP to the MLP were included in the financial evaluation.
The mining schedule begins in period -1 and continues through period 7. Mill mineralized material would be stockpiled based in the mining periods where the mine output is greater than the 8,200 tpd mill ........
Source:
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Flow Sheet:
Summary:
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Reserves at October 7, 2020:
Cut-off grades for mill processing were 0.06 g/t for oxide gold mineralization and 0.40 g/t for sulphide gold mineralization.
| Category | OreType | Tonnage | Commodity | Grade | Contained Metal |
|
Measured
|
Heap leach
|
17,018 kt
|
Gold
|
0.39 g/t
|
211 koz
|
|
Measured
|
Sulphide
|
7,311 kt
|
Gold
|
1.19 g/t
|
280 koz
|
|
Measured
|
Total
|
24,329 kt
|
Gold
|
0.63 g/t
|
491 koz
|
|
Measured
|
Heap leach
|
17,018 kt
|
Silver
|
0.98 g/t
|
534 koz
|
|
Measured
|
Sulphide
|
7,311 kt
|
Silver
|
0.76 g/t
|
179 koz
|
|
Measured
|
Total
|
24,329 kt
|
Silver
|
0.91 g/t
|
713 koz
|
|
Indicated
|
Heap leach
|
22,242 kt
|
Gold
|
0.47 g/t
|
339 koz
|
|
Indicated
|
Sulphide
|
13,668 kt
|
Gold
|
1.64 g/t
|
722 koz
|
|
Indicated
|
Total
|
35,910 kt
|
Gold
|
0.92 g/t
|
1,061 koz
|
|
Indicated
|
Heap leach
|
22,242 kt
|
Silver
|
0.8 g/t
|
573 koz
|
|
Indicated
|
Sulphide
|
13,668 kt
|
Silver
|
0.51 g/t
|
223 koz
|
|
Indicated
|
Total
|
35,910 kt
|
Silver
|
0.69 g/t
|
796 koz
|
|
Measured & Indicated
|
Heap leach
|
39,260 kt
|
Gold
|
0.44 g/t
|
550 koz
|
|
Measured & Indicated
|
Sulphide
|
20,980 kt
|
Gold
|
1.49 g/t
|
1,002 koz
|
|
Measured & Indicated
|
Total
|
60,240 kt
|
Gold
|
0.8 g/t
|
1,552 koz
|
|
Measured & Indicated
|
Heap leach
|
39,260 kt
|
Silver
|
0.88 g/t
|
1,107 koz
|
|
Measured & Indicated
|
Sulphide
|
20,980 kt
|
Silver
|
0.6 g/t
|
402 koz
|
|
Measured & Indicated
|
Total
|
60,240 kt
|
Silver
|
0.78 g/t
|
1,509 koz
|
|
Inferred
|
Heap leach
|
6,978 kt
|
Gold
|
0.4 g/t
|
90 koz
|
|
Inferred
|
Sulphide
|
2,883 kt
|
Gold
|
0.9 g/t
|
83 koz
|
|
Inferred
|
Total
|
9,862 kt
|
Gold
|
0.55 g/t
|
173 koz
|
|
Inferred
|
Heap leach
|
6,978 kt
|
Silver
|
1.05 g/t
|
235 koz
|
|
Inferred
|
Sulphide
|
2,883 kt
|
Silver
|
1.77 g/t
|
164 koz
|
|
Inferred
|
Total
|
9,862 kt
|
Silver
|
1.26 g/t
|
399 koz
|
Corporate Filings & Presentations:
| Document | Year |
|
...................................
|
2020
|
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