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Canada
Halfmile Mine (Halfmile-Stratmat Operation)

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 Location:
68 km NW from Miramichi, New Brunswick, Canada

  Project Contacts:
1900 – 999 West Hastings Street
Vancouver
British Columbia, Canada
V6C 2W2
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Fax+1-604-608-9863
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageRestarting
Mine TypeUnderground
Commodities
  • Zinc
  • Lead
  • Copper
  • Silver
  • Gold
Mining Method
  • Mechanized Cut & Fill
  • Post Pillar Cut & Fill
  • Sub-level stoping
  • Avoca
  • Sub-level Retreat
  • Longitudinal retreat
  • Cemented backfill
Mine Life2032
AeroVision Mag-Drone magnetometer surveys were conducted on the Halfmile Lake Central and California Lake Mineral Claims as part of the required exploration work commitments to maintain the claims in good standing. The analysis and interpretation of the results aimed at providing a better understanding of the structural geology and stratigraphy are still in progress and will continue in 2022.


Owners

Source: p. 8
CompanyInterestOwnership
Trevali Mining Corp. 100 % Indirect
Ownership Tree
The Halfmile Project is 100% held by Trevali Mining (Maritimes) Ltd., a 100% owned subsidiary of Trevali Mining Corporation.

Contractors

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Deposit Type

  • VMS


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 Halfmile project is underlain 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 Tetagouche group and Nepisiguit Falls formation. ........


Mining Methods

  • Mechanized Cut & Fill
  • Post Pillar Cut & Fill
  • Sub-level stoping
  • Avoca
  • Sub-level Retreat
  • Longitudinal retreat
  • Cemented backfill


Summary:

At Halfmile, all run-of-mine (RoM) material will be mined by underground mining method. Sublevel open stoping (SLOS) and Sublevel Retreat (SLR) will be the main mining methods planned, supplemented by post pillar cut and fill (PPCF) and mechanized cut and fill (MCF) mining for Upper zone where mineralization dip angle is approximately at 39 degrees. All mining methods will employ either cemented or unconsolidated waste rock as backfill. The mine plan includes 92% of RoM tonnes from SLOS/SLR with down holes (up holes for sill pillar recovery) on 20 m sublevels and cemented or unconsolidated waste rock fill, and 8% of RoM tonnes from PPCF/MCF with unconsolidated waste rock and cemented waste rock (sill level stopes only). There is no permanent sill or rib pillar considered for the SLOS/SLR mining. Limited sill pillars were planned only for the two trial mining opened mining fronts.

Access to the underground mine will be by an existing portal and ramp system developed previously to a depth of 170 m below surface. The ramp will be extended down to the mine bottom approximately 1,020 m below surface at a maximum gradient of -15% with dimensions of 5.0 m width by 5.0 m height, the same as the existing ramp.

Stope sequencing will generally be top-down block by block, and bottom-up within the mining block. On a mining level scale, both transverse primary-secondary stope sequence and longitudinal retreat mining will be employed, dependent on mineralization thickn ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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Combined production numbers are reported under Halfmile-Stratmat Operation

Operational Metrics:

Metrics
Daily ore mining rate 2,600 t *
Ore tonnes mined, LOM 9,376 kt *
Tonnes milled, LOM 9,376 kt *
Annual mining rate 910,000 t of ore *
* According to 2017 study.

Reserves at December 31, 2021:
Mineral Resource estimate is reported based on zinc equivalent cut off grade of 5% ZnEq.

CategoryTonnage CommodityGradeContained Metal
Measured 0.4 Mt Zinc 5.92 % 54 M lbs
Measured 0.4 Mt Lead 1.99 % 18 M lbs
Measured 0.4 Mt Copper 0.46 % 4 M lbs
Measured 0.4 Mt Silver 40 g/t 520 koz
Measured 0.4 Mt Gold 0.6 g/t 10 koz
Indicated 7.4 Mt Zinc 7 % 1,146 M lbs
Indicated 7.4 Mt Lead 2.37 % 389 M lbs
Indicated 7.4 Mt Copper 0.16 % 26 M lbs
Indicated 7.4 Mt Silver 35 g/t 8,450 koz
Indicated 7.4 Mt Gold 0.29 g/t 70 koz
Measured & Indicated 7.8 Mt Zinc 6.94 % 1,199 M lbs
Measured & Indicated 7.8 Mt Lead 2.35 % 407 M lbs
Measured & Indicated 7.8 Mt Copper 0.18 % 31 M lbs
Measured & Indicated 7.8 Mt Silver 36 g/t 8,980 koz
Measured & Indicated 7.8 Mt Gold 0.3 g/t 80 koz
Inferred 6.5 Mt Zinc 5.62 % 806 M lbs
Inferred 6.5 Mt Lead 1.51 % 216 M lbs
Inferred 6.5 Mt Copper 0.15 % 21 M lbs
Inferred 6.5 Mt Silver 23 g/t 4,720 koz
Inferred 6.5 Mt Gold 0.1 g/t 20 koz

Operating Costs:

Units2017
UG mining costs ($/t mined) CAD 38.2 *
* According to 2017 study.

2017 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Pre-Production capital costs $M CAD  ......  Subscription required
Sustaining CapEx $M CAD  ......  Subscription required
Subscription required - Subscription is required.


Proposed Heavy Mobile Equipment as of October 26, 2017:
HME TypeModelSizeQuantityLeased or
Contractor
ANFO Loader ....................... Subscription required
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....................... Subscription required ....................... Subscription required Leased
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 27, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 27, 2022
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Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Annual Information Form 2018
Management Discussion & Analysis 2018
Press Release 2018
Management Discussion & Analysis 2017
Preliminary Economic Assessment 2017
Management Discussion & Analysis 2016
Management Discussion & Analysis 2015
Technical Report 2010
Subscription required - Subscription is required.

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