Overview
| Status | Care and Maintenance |
| Mine Type | Underground |
| Commodities |
|
| Mining Method |
- Overhand Cut & Fill
- Longhole stoping
- Avoca
- Longitudinal retreat
- Room-and-pillar
- Cemented backfill
|
Holt Mine Complex consists of three mines: The Holt Mine and Mill and the Holloway Mine, and the Taylor Mine located approximately 68 km by road west of the Holt Mill.
Operations were suspended at the Holt Complex effective April 2, 2020 as part of the Company’s COVID-19 response and while the Company conducted a strategic review of these assets. In July 2020, the Company announced that the suspension of operations at Holt Complex would be extended until further notice. As a result, there was no production, sales, operating costs or capital expenditures from Holt Complex in Q3 2021 or YTD 2021. Care and maintenance costs in YTD 2021 related to Holt Complex totalled $3.7 million ($0.8 million in Q3 2021). In addition, the Company recorded an asset impairment of $6.5 million related to the disposal of equipment at the Holt Complex in Q1 2021. |
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
- Carbonate replacement
- Vein / narrow vein
- Volcanic hosted
Summary:
At Holt-Holloway, the deposit is a mafic volcanic hosted where the gold mineralization is quite unlike the classical Superior province auriferous quartz vein systems resulting from deformed, extensional fracture arrays. Rather, it is associated with disseminated sulphides in altered rock, sometimes described as replacement mineralization. Mineralization typically consists of moderately to steeply dipping tabular zones of disseminated pyrite (generally less than 5 per cent per volume) and gold in intensely altered tholeiitic basalt, with variably developed microveinlet stockworks. The ore is gold rich (Au:Ag is greater than 5) and contains concentrations of arsenic. The mineralized zones occur in a variety of geological settings reflecting a variety of controls on the localization of the mineralization: along low-strain lithological contacts (Lightning, Blacktop and Lightning Deep zones at Holloway), along brittle and/or ductile faults (McDermott, Worvest and Mattawasaga zones), and as shallowly dipping discordant zones (Tousignant, South Zone and Zone 4) of which the South Zone (Holt) is spatially
coincident with an array of shallowly dipping syenitic dykes.
Mineralized zones are coincident with zones of intense albite-ankerite alteration of the host basalt, which, in turn, are partly fringed by sericite alteration haloes at Holloway and fringed by broader zones of calcite alteration. Disseminated specular hematite can be present within or outboard of mineral ........
Mining Methods
- Overhand Cut & Fill
- Longhole stoping
- Avoca
- Longitudinal retreat
- Room-and-pillar
- Cemented backfill
Summary:
The primary stoping method at the Holt Mine is mechanised long hole drilling and blasting within the mining blocks with rail transport to the shaft ore passes. The spacing between sublevels for long hole stoping varies between 20 m and 17 m, depending on the dip of the ore. Mechanized long hole stoping is planned to be used in all zones at the Holt mine. “Drift and pillar” stoping may be needed in some areas where the ore is too shallow and not amenable to long hole methods. Drilling is performed with tophammer drills, with hole sizes ranging from 64 mm to 76 mm in diameter.
The Tousignant Zone is planned to be mined with modified room and pillar.
Zone 4 is accessed by mechanised equipment via ramps and sublevels connected to two main rail haulage levels 925 and 1075. Zone 4 is divided into two mining blocks: the upper mining block represents the stopes reporting to the 925 haulage level and the lower mining block represents the stopes reporting to the 1075 haulage level. The use of both haulage levels provides increased flexibility to the overall Holt mine plan.
The mine extraction sequence for Zone 4 is using a primary-secondary stoping arrangement with cemented rock fill being used in the primary stopes. Strike length is set at 15 m for the primary stopes and 20 m for the secondary stopes. Sublevels in Zone 4 are spaced 17 m apart due to the shallow dipping nature of the ore within the zone. The current mine plan includes stopes being mined ........
Source:
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Flow Sheet:
Summary:
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Production:
| Commodity | Units | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|
Gold
|
koz
| ...... | ...... | 127 | 117 | 129 | 107 |
All production numbers are expressed as metal in doré.
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Operational Metrics:
| Metrics | 2020 | 2019 | 2018 | 2017 | 2016 |
|
Tonnes milled
| ...... | 853,528 t | 860,023 t | 754,990 t | 820,055 t |
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Reserves at December 31, 2020:
Mineral Resources for Holt Complex were estimated at the following cut-off grades: Holt Mine: 2.8 g/t, with the exceptions noted below; Holt Near-Surface Zones: 2.5 g/t (Tousignant, Cascade, North Mattawasaga Pit); Holloway Mine: 2.8 g/t, with the exception of the Deep Thunder (2.7g/t) and Canamax (2.5 g/t); Taylor Mine: 2.6 g/t; Hislop Property: 2.2 g/t.
| Category | Tonnage | Commodity | Grade | Contained Metal |
|
Measured & Indicated
|
11,690 kt
|
Gold
|
4.5 g/t
|
1,699 koz
|
|
Inferred
|
9,097 kt
|
Gold
|
4.5 g/t
|
1,310 koz
|
Mine Management:
| Job Title | Name | Profile | Ref. Date |
|
.......................
|
.......................
|
|
Sep 6, 2022
|
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Staff:
| Total Workforce | Year |
|
|
2019
|
Corporate Filings & Presentations:
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