Overview
Stage | Permitting |
Mine Type | Underground |
Commodities |
|
Mining Method |
- Room-and-pillar
- Continuous
|
Mine Life | 10.3 years (as of Jan 1, 2023) |
The Copperwood project is fully-permitted copper project.
Highland initiated pre-construction activities including site clearing and grubbing focused on wetland and stream areas, the development of stream relocation infrastructure, improvements to existing site roads, and the initiation of key environmental mitigation projects. |
Latest News | Michigan Strategic Fund Approves $50 Million Grant for Highland Copper's Copperwood Project March 26, 2024 |
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The Copperwood project is Highland’s 100%-owned. The Copperwood Project consists of four metallic and non-metallic mineral leases. Each lease was executed by Copperwood Resources Inc., formerly known as Orvana Resources US Corp., a wholly owned subsidiary of Highland.
Contractors
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Summary:
The Copperwood Project is situated on the flank of the 2,200 km long Mesoproterozoic mid-continent rift system of North America and is hosted in the Nonesuch Formation; a package of lacustrine and fluvial sediments, which form part of the Oronto Group post-rifting basin fill. Mineralization is hosted within two sedimentary sequences termed the Lower Copper Bearing Sequence (“LCBS”) and Upper Copper Bearing Sequence (“UCBS”) at the base of the Nonesuch Formation.
Deposit Types
The mineralization at Copperwood has been interpreted as a sediment-hosted stratiform copper deposit of the reduced facies class.
Sediment-hosted stratiform copper deposits consist of copper and copper-iron sulphide minerals hosted by siliciclastic or dolomitic rocks in which a relatively thin copper-bearing zone is mostly conformable with stratification of the host sedimentary rocks. Copper in chalcocite occurs as disseminations and seams along bedding planes. Chalcocite is the only observed copper sulphide bearing mineral present at Copperwood.
Mineralization
The Copperwood and Satellite Deposits are situated on the limbs of the Presque Isle Syncline within the Nonesuch Formation. The Nonesuch Formation contains two mineralized sequences, one located at the base (LCBS), and another located stratigraphically higher (UCBS), separated by poorly mineralized sediments from 0.5 to 6.0 m thick.
The LCBS is composed of the Domino, Red Massive and the Gra ........
Mining Methods
- Room-and-pillar
- Continuous
Summary:
The proposed mining method for the Copperwood Project is room-and-pillar given the relatively sub-horizontal orebody that varies in thickness from 1.6 m to 3.7 m. Based on the orebody thickness, two (2) approaches were selected to carry out the development of the room and pillar: conventional drill and blast, and continuous mining. The drill and blast approach is utilized whenever the orebody thickness is below 3.0 m, whereas the continuous miner will be used in the areas where the orebody thickness is 3.0 m or greater.
The mining method consists of the extraction of a series of entries and crosscuts in the ore leaving pillars in place to support the back.
The mine is comprised of two (2) sectors: the Eastern part and the Western part. The Western part contains higher grades and a thicker mineralized zone. For these reasons, mining will begin in the western part which is subdivided into five (5) extraction panels. The East part is subdivided into four (4) extraction panels: panels 20 to 23. The mining direction will generally follow the dip of the orebody, but in some areas the dip is too steep to follow. In the areas where the dip is too steep, the mining will be done at an angle in the dip direction.
Mining the UCBS as a full column with the LCBS was evaluated but was not retained. It was deemed less economical than the option of mining only the LCBS unit. This Feasibility Study focuses on the LCBS unit to generate better operating margins. ........
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Flow Sheet:
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Pipelines and Water Supply
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Reserves at May 25, 2022:
Mineral Reserves are estimated at a cut-off grade of 1% Cu.
Mineral Resources are reported using a Cut-off grade of 0.9% copper.
Category | Tonnage | Commodity | Grade | Contained Metal |
Proven
|
18.2 Mt
|
Silver
|
4.47 g/t
|
2.61 M oz
|
Probable
|
7.5 Mt
|
Silver
|
2.56 g/t
|
0.62 M oz
|
Proven & Probable
|
25.7 Mt
|
Silver
|
3.91 g/t
|
3.23 M oz
|
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