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Canada
Stratmat Project (Halfmile-Stratmat Operation)

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

  Project Contacts:
1900 – 999 West Hastings Street
Vancouver
British Columbia, Canada
V6C 2W2
Phone  ...  Subscription required
Fax+1-604-608-9863
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Overview

StagePreliminary Economic Assessment
Mine TypeUnderground
Commodities
  • Zinc
  • Lead
  • Copper
  • Silver
  • Gold
Mining Method
  • Sub-level open stoping (SLOS)
  • Avoca
  • Sub-level Retreat
  • Longitudinal retreat
  • Cemented backfill
Mine Life10 years (as of Jan 1, 2017)


Owners

Source: p. 7, 8
CompanyInterestOwnership
Trevali Mining Corp. 100 % Indirect
The Stratmat 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 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 ........


Crushing and Grinding
Flow Sheet: Source

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.


Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Projected Production:

CommodityUnitsLOM
Zinc lbs 0
Lead lbs  ......  Subscription required
Copper lbs  ......  Subscription required
Silver oz  ......  Subscription required
Gold oz  ......  Subscription required

Operational Metrics:

Metrics
Daily milling capacity 3,000 t *
Daily ore mining rate 1,400 t *
Ore tonnes mined, LOM 3,635 kt *
Tonnes milled, LOM 3,635 kt *
Annual milling capacity 1.12 Mt *
Annual ore mining rate 490,000 t *
* According to 2017 study.

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

CategoryTonnage CommodityGradeContained 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:

Units2017
UG mining costs ($/t mined) CAD 33.4 *
* 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
Closure costs $M CAD  ......  Subscription required
Total 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 ....................... Subscription required
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Subscription required - Subscription is required.


Corporate Filings & Presentations:

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

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