Overview
Status | Care and Maintenance |
Mine Type | Underground |
Commodities |
|
Mining Method |
- Longitudinal retreat
- Open stoping
- Undefined backfill
|
Production Start | ... |
Holt Mine Complex consists of three past-producing mines mines: The Holt Mine and Mill and the Holloway Mine, and the Taylor Mine located approximately 68 km byroad west of the Holt Mill.
The Holt mill, which is currently on care and maintenance, has a capacity of 3,000 tpd and a fully permitted tailings storage facility. The Company plans to evaluate the potential to integrate a number of satellite deposits with the existing infrastructure in the region. |
Source:
p. 1
St Andrew Goldfields Ltd. is a wholly-owned subsidiary of Kirkland Lake Gold Ltd.
Kirkland Lake Gold Ltd owns the Holt Complex, which includes three wholly owned mines, the Taylor mine (“Taylor”), Holt mine (“Holt”) and Holloway mine (“Holloway”), as well as a central milling facility, the Holtmill.
February 8, 2022 – Agnico Eagle Mines Limited and Kirkland Lake Gold Ltd. are pleased to announce the successful completion of the previously announced merger of equals transaction (the “Merger”).
The combined company will continue as Agnico Eagle Mines Limited.
Contractors
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Deposit Type
- Volcanic hosted
- Carbonate replacement
Summary:
Regional Geology
The Holloway and Holt mines lie within the Southern Abitibi Greenstone Belt (SAGB) of the Superior Province in north-eastern Ontario. The 40 km long, mostly contiguous HoltHolloway property package is a grouping of strategically located claims straddling the Porcupine-Destor Fault Zone (“PDF”) midway along its 260 km length.
Local Geology
The deformation history of the area is defined by five events. The earliest episode of regional D1 deformation (compression and extension) predated the Porcupine angular unconformity at 2,690 Ma. The D2 event (compression and extension) post-dated the Porcupine assemblage and resulted in localized folding and thrusting and early southside up, dip-slip, ductile deformation on regional deformation zones. Broadly synchronous with the syntectonic opening of the Timiskaming basins in dilatational jogs was D3 folding that resulted in significant left lateral slip movement along the PDF. The D4 folding event created synclines within the Timiskaming assemblage rocks and rightlateral strike-slip displacement along the PDF. The D4-D5 event represents the final stage of transpressional deformation along the PDF. Gold mineralization in the HoltHolloway area is interpreted to be early D3 in age. Lightning Zone replacement mineralization is cut by an inter-mineral dike with an age of 2672 ± 1.9Ma, which is overprinted by a later auriferous quartz-carbonate veining event. The bulk of the gold in the Timm ........
Mining Methods
- Longitudinal retreat
- Open stoping
- Undefined backfill
Summary:
Design Criteria
Mining activities at the Holloway mine are planned to be concentrated in two zones: Smoke Deep, which is located between the Lightning Zone to the west and the Blacktop Zone to the east, and the Lightning/Middle Zone which is the main portion of the mine developed by previous owners.
Smoke Deep
The Smoke Deep Zone extends vertically from 765 m to 865 m and is mostly open at depth and to the east. The zone is accessed via a 1.4 km long ramp from the 730 level at the Lightning Zone. The zone consists of steeply dipping ore and is amenable to long hole stoping mining method.
Ore is transported in the zone via an internal ore pass reporting to a chute on the 845 level. Ore is then transferred by 26 and 30 tonne trucks to the main ore pass on the 730 level in the Lightning Zone. In areas mined below the 845 level, the ore will need to be trucked up to the 845 level and then on to the 730 ore pass. Hauling of waste to the 730 level at the Lightning Zone is minimized by scheduling stopes so that waste can be used as backfill. Smoke Deep is serviced by a single vent raise. It extends from the 845 level to the 505 Blacktop access drift. Fresh air is forced down the main access ramp and up the internal Smoke Deep ramp system. Auxiliary fans feed individual levels from the ramp and the air is exhausted to the 505 level via the internal ventilation raise. Exhaust air splits on the 505 level with approximately half returnin ........
Flow Sheet:
Source:
Ore mined at the Holloway Mine will be processed at the Company's Holt Mill.
Surface ore storage is a total of 4,900 t in three silos, the Holt headframe bin (900 t) and two other separate storage bins (1,000 t and 3,000 t). Ore can be delivered to the mill from the Holt Mine by conveyor or from a separate surface dump that enters a 100 tonne hopper, and then can be fed to either of the two storage bins.
The grinding circuit consists of a 5 m diameter by 6.1 m long Allis Chalmers ball mill, converted to a SAG mill, a 4 m diameter by 5.5 m long Allis Chalmers ball mill and a 3.6 m diameter by 4.9 m long tertiary ball mill, all operating in series and in closed circuit. The grinding circuit is controlled by a Wonderware system and Modicom programmable logic.
Flow Sheet:
Summary:
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Source:
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Production:
All production numbers are expressed as metal in doré.
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Operational Metrics:
Metrics | 2016 |
Tonnes milled
| 204,776 t |
Reserves at December 31, 2018:
Category | Tonnage | Commodity | Grade | Contained Metal |
Proven & Probable
|
257 kt
|
Gold
|
4.3 g/t
|
36 koz
|
Measured & Indicated
|
1,955 kt
|
Gold
|
4 g/t
|
251 koz
|
Inferred
|
5,309 kt
|
Gold
|
4.1 g/t
|
706 koz
|
Commodity Production Costs:
| Commodity | Units | 2019 | 2017 |
Cash costs (sold)
|
Gold
|
USD
|
|
1,592 / oz
|
Total cash costs (sold)
|
Gold
|
USD
|
|
|
All-in sustaining costs (sold)
|
Gold
|
USD
|
......
|
1,611 / oz
|
Corporate Filings & Presentations:
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