Overview
Status | Inactive / Suspended |
Mine Type | Underground |
Commodities |
|
Mining Method |
- Sub-level open stoping (SLOS)
- Avoca
- Sub-level Retreat
- Longitudinal retreat
- Cemented backfill
|
Mine Life | 13 years (as of Jan 1, 2017) |
The Halfmile-Stratmat integrated project is comprised of the Halfmile mine and the advanced exploration stage Stratmat project.
On Aug. 19, 2022, Trevali Mining Corporation announced that the Company had received an Initial Order for creditor protection from the British Columbia Supreme Court under the Companies' Creditors Arrangement Act (the "CCAA").
On June 30, 2023, Trevali Mining Corporation announced that the Supreme Court granted an order in the Company's ongoing CCAA proceedings pursuant to which FTI Consulting Canada Inc., the Court appointed "Monitor", has been granted enhanced powers in the CCAA Proceedings with respect to the Company's business and affairs.
The Monitor's powers to manage the Company, the Company's remaining employees have ceased their employment with the Company.
Please note that all data presented below is sourced from 2017 technical report prepared by SRK Consulting (Canada) Inc. |
Source:
p. 2
The Halfmile-Stratmat integrated project is 100% held by Trevali Mining (Maritimes) Ltd., a 100% owned subsidiary of Trevali Mining Corporation.
On June 30, 2023, Trevali Mining Corporation announced that the Supreme Court of British Columbia granted an order in the Company's ongoing Companies' Creditors Arrangement Act proceedings (the "CCAAProceedings") pursuant to which FTI Consulting Canada Inc., the Court appointed "Monitor", has been granted enhanced powers in the CCAA Proceedings with respect to the Company's business and affairs.
Contractors
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Summary:
The Halfmile and Stratmat projectss are volcanic massive sulphide (VMS) deposits typical of the Bathurst Mining Camp (BMC). The BMC hosts 45 volcanic-sediment hosted massive sulphide deposits and 95 occurrences, including the world-class Brunswick 12 Mine. BMC deposits formed in a sediment-covered back-arc continental rift during periods when the basin was stratified with a lower anoxic water column. The basin was subsequently intensely deformed and metamorphosed during multiple collisional events related to east-dipping subduction of the basin.
The VMS deposits typically form lenses of polymetallic massive sulphide. Most deposits are zoned vertically and laterally from a high temperature, vent-proximal, copper-polonium bismuth-rich veined and brecciated core to vent-distal zinc-lead-silver-rich hydrothermal sediments. The vent complex is commonly underlain by a highly deformed sulphide stringer zone that extends hundreds of metres beneath deposits and consists of veins and impregnations of sulphides, silicates, and carbonates that cut chloritized and sericitized volcanic and sedimentary rocks.
The Stratmat claims are underlain by a magnetic northeast-southwest trending sequence of predominantly felsic volcanic rocks and lesser sedimentary rocks which are host to all massive sulphide deposits on the property. Provincial Government regional mapping projects have classified the rocks as belonging to the Flat Landing Brook formation of the Middle Ordovician ........

Mining Methods
- Sub-level open stoping (SLOS)
- Avoca
- Sub-level Retreat
- Longitudinal retreat
- Cemented backfill
Summary:
At Stratmat, RoM material will be mined by underground mining, too, similar to Halfmile underground mining except there is no PPCF/MCF mining method employed. RoM materials will be directly hauled by 45-tonne capacity underground trucks to Stratmat DMS plant for waste separation.
There will be two independent ramp systems to access Stratmat underground mineralization. The Main ramp system will be used to access the S1 (Shallow and Deep), S0, and S5 zones (main production system); and the Main zone ramp will be used to access the Main zone underground mineralization (supplement production system).
Backfill will be first sourced from development waste rock, supplemented by back trucked Stratmat DMS plant separated waste.
Ventilation is designed at 189 cms (400,000 cfm) for a production rate of 1,400 t/d for the main production system, providing an estimated 14% contingency. Intake will be through the Main ramp and a 3.6 m diameter of raisebored FAR, exhaust will be through a 4.5 m diameter of raisebored RAR.
Ventilation is designed at 42 cms (90,000 cfm) for the supplement production system. Intake will be through the Main zone ramp, exhaust will be through a 2.4 m diameter of raisebored RAR.
Underground dewatering strategy is similar to the Halfmile underground dewatering system.
Due to the complex geometry and variability in strike and dip, the development of a tool box of mining methods is recommended in o ........

Flow Sheet:
Halfmile Stratmat Concentrator includes crushing and DMS circuits.
In the current Preliminary Economic Assessment for the Halfmile-Stratmat Massive Sulphide Zinc-Lead-Silver Integrated Project has been assumed that primary crushing, secondary crushing and screening will be contracted out. The crushed product will be fed to a covered stockpile with a live content of 4,000 tonnes and the DMS plant will be fed using two apron feeders in a tunnel under the stockpile at 175 tonnes per hour. The dense media process is expected to reject 22% of the mass of RoM material in a reject which will be suitable for producing backfill with the addition of the required amount of cement. As only the +3 mm fraction of the RoM material can be upgraded, the -3 mm fraction will be screened out on a wet screen, thickened and the thickener underflow pumped to the ball mill discharge pump box or to a lagoon if the DMS plant is operating and the main plant is down. DMS upgraded material will be conveyed to a second stockpile with a live content of 3,000 tonnes.
Design feed tonnage to the grinding circuit is 145 tonnes per hour. The BAG mill will operate in closed circuit with a vibrating screen recycling the +5 mm fraction back to the BAG mill. Screen undersize will flow to a secondary ball mill which will operate in closed circuit with 15-inch diameter cyclones and will grind the material to a P80 of 72 microns.
Flow Sheet:
Summary:

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Projected Production:
Commodity | Units | LOM |
Zinc
|
lbs
| 0 |
Lead
|
lbs
| ......  |
Copper
|
lbs
| ......  |
Silver
|
oz
| ......  |
Gold
|
oz
| ......  |
Operational Metrics:
Metrics | |
Daily ore mining rate
| 1,400 t * |
Daily milling capacity
| 3,000 t * |
Annual ore mining rate
| 490,000 t * |
Annual milling capacity
| 1.12 Mt * |
Waste tonnes, LOM
| 1,581 kt * |
Ore tonnes mined, LOM
| 3,635 kt * |
Tonnes milled, LOM
| 3,635 kt * |
* According to 2017 study.
Reserves at May 20, 2015:
The Stratmat Underground Project Mineral Resource estimate is reported based on zinc equivalent cut off grade of 5% ZnEq.
Category | Tonnage | Commodity | Grade | Contained Metal |
Indicated
|
4.7 Mt
|
Zinc
|
5.3 %
|
550 M lbs
|
Indicated
|
4.7 Mt
|
Lead
|
2.1 %
|
214 M lbs
|
Indicated
|
4.7 Mt
|
Copper
|
0.4 %
|
43 M lbs
|
Indicated
|
4.7 Mt
|
Silver
|
49 g/t
|
7,300 koz
|
Indicated
|
4.7 Mt
|
Gold
|
0.6 g/t
|
90 koz
|
Inferred
|
2.4 Mt
|
Zinc
|
4.8 %
|
252 M lbs
|
Inferred
|
2.4 Mt
|
Lead
|
2.1 %
|
110 M lbs
|
Inferred
|
2.4 Mt
|
Copper
|
0.7 %
|
37 M lbs
|
Inferred
|
2.4 Mt
|
Silver
|
39 g/t
|
3,000 koz
|
Inferred
|
2.4 Mt
|
Gold
|
0.4 g/t
|
30 koz
|
Operating Costs:
| Units | 2017 |
UG mining costs ($/t mined)
|
CAD
| 33.4 * |
* According to 2017 study.
2017 Study Costs and Valuation Metrics :
Metrics | Units | LOM Total |
Pre-Production capital costs
|
$M CAD
|
......
|
Sustaining CapEx
|
$M CAD
|
......
|
Closure costs
|
$M CAD
|
......
|
Total CapEx
|
$M CAD
|
......
|
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Source:

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Mine Management:
Job Title | Name | Phone | Email | Profile | Ref. Date |
.......................
|
.......................
|
.......................
|
.......................
|
|
Aug 28, 2023
|
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Corporate Filings & Presentations:
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