Overview
Stage | Preliminary Economic Assessment |
Mine Type | Open Pit & Underground |
Commodities |
|
Mining Method |
- Truck & Shovel / Loader
- Mechanized Cut & Fill
- Undefined backfill
|
Mine Life | 11.2 years (as of Jan 1, 2023) |
Colomac Project is on Fast-track to Feasibility Study.
Permitting requires a minimum of 2 years of environmental baseline studies to be completed as part of the Environmental Assessment. 2-years of environmental baseline work to commence, with input from First Nation groups. |
Source:
p. 1
On February 6, 2024, STLLR Gold Inc. and Nighthawk Gold Corp. completed at-market merger by way of a court-approved plan of arrangement. In connection with the Transaction, Moneta Gold Inc. changed its name to "STLLR Gold Inc.".
Under the terms of the Arrangement, STLLR acquired all of the issued outstanding common shares of Nighthawk. As a result of the Arrangement, Nighthawk has become a wholly-owned subsidiary of STLLR.
Contractors
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Deposit Type
- Banded iron formation hosted
- Vein / narrow vein
Summary:
The Colomac property lies within the Indin Lake Supracrustal Belt, a 300 km long (2,000 km2 ), NNE-trending, elongate area of Archean volcanic and sedimentary rocks belonging to the Yellowknife Supergroup (Frith, 1986). The belt lies within the southwestern Slave Structural Province, 30 km east of the boundary with the Bear Province (Morgan, 1992).
Two main gold deposit models are relevant to most of the mineral deposits and showings on the Property: 1) greenstone-hosted quartz-carbonate vein (“GQCV”) deposits; and 2) BIF-hosted deposits. Both types are lithology-based subtypes of orogenic gold deposits. Additionally, the Andy Lake and the Treasure Island area were interpreted as an intrusion-related gold system (“IRGS”) and volcanogenic-related gold mineralization, respectively, although the latter still needs to be demonstrated. Until then, Treasure Island is classified within the GQCV model.
The Hewitt Lake Group is conformably overlain by the Leta Arm Group, which consists of NNE-trending belts 1 to 4 km thick and 5 to 30 km long. It comprises a heterogeneous sequence of submarine to subaerial, tholeiitic, and calc-alkaline, mafic to felsic volcanic rocks intruded by synvolcanic gabbro to quartz diorite intrusions. It has a greater proportion of intermediate to felsic volcanic and volcaniclastic rocks than the Hewitt Lake Group and hosts numerous gold deposits, including the Colomac deposits, as well as polymetallic and base metal prospects.
Mining Methods
- Truck & Shovel / Loader
- Mechanized Cut & Fill
- Undefined backfill
Summary:
Open pit and underground mine designs, mine production schedules have been developed for the Colomac Main, Grizzly Bear, Goldcrest, 24/27, Kim, Cass, Damoti, and Treasure Island deposits at a scoping level of engineering.
The open pit operations are designed for approximately 13 years, and the underground operations are designed to take place concurrently. Conventional drill/blast/load/haul open pit mining methods are suited for the project location and local site requirements. Mechanized cut-and-fill (MCF) underground mining methods are suited for the deposit geometries and targeted selectivity and production rates.
For Colomac Main, the ultimate pit limits are split up into phases or pushbacks to target higher economic margin material earlier in the mine life. The Goldcrest, Grizzly Bear, 24/27, Cass, Kim and Damoti open pits are each planned to be mined as one phase. Geotechnical investigations have not been completed for the deposits, so benches and ramps have not been designed, and pit contents are bounded by the optimization shells. Open pit shells have 45° overall slopes at Colomac and 50° overall slopes in all other deposits. Open pit contents are based on a diluted and recovered 5 m SMU block size (6 m block size for Damoti).
Underground stope inventories are determined using the stope shape optimizer algorithm targeting material above 2.5 g/t Au, and with stope shape sizes of 10 m long x 10 m high x 4 m thick, appropriate for MCF met ........
Source:
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Flow Sheet:
Summary:
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Source:
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Reserves at February 9, 2023:
The open pit cut-off grades vary from 0.45 to 0.57 g/t Au.
The underground cut-off grades vary from 1.02 to 1.66 g/t Au.
Category | OreType | Tonnage | Commodity | Grade | Contained Metal |
Indicated
|
In-Situ (OP)
|
59,945 kt
|
Gold
|
1.45 g/t
|
2,804,000 oz
|
Indicated
|
In-Situ (UG)
|
10,486 kt
|
Gold
|
1.73 g/t
|
583,000 oz
|
Indicated
|
Total
|
70,432 kt
|
Gold
|
1.5 g/t
|
3,387,000 oz
|
Inferred
|
In-Situ (OP)
|
11,070 kt
|
Gold
|
2.33 g/t
|
830,000 oz
|
Inferred
|
In-Situ (UG)
|
13,364 kt
|
Gold
|
2.03 g/t
|
872,000 oz
|
Inferred
|
Total
|
24,434 kt
|
Gold
|
2.17 g/t
|
1,702,000 oz
|
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