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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:
2300 - 1177 West Hastings Street
Vancouver
British Columbia, Canada
V6E 2K3
Phone  ...  Subscription required
Fax604-408-7499
EmailEmail
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Overview

StagePreliminary Economic Assessment
Mine TypeUnderground
Commodities
  • Zinc
  • Lead
  • Copper
  • Silver
  • Gold
Mining Method
  • Sub-level stoping
  • Avoca
  • Sub-level Retreat
  • Longitudinal retreat
  • Cemented backfill
Processing
  • Flotation
  • Dense media separation
Mine Life8 years (as of Jan 1, 2017)


Owners

Source: p. 16
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.

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 sulphide minerals consist of disseminated and massive pyrite-sphalerite-galena and chalcopyrite. The sulphide minerals are fine- to medium-grained, and are coarser than those typically found in deposits of the BMC.

Disseminated mineralization, commonly of economic grade, occurs in the phyllitic sedimentary rocks as well as in the talc layers which locally grade into massive sulphide. A layer of massive pyrite-chalcopyrite, typically less than 1 m thick, occurs locally on the stratigraphic footwall side of the economic mineralization.

Stratigraphic relationships are based on observations of drill and rock exposures. The copper-rich layer may be in contact with, or grade into pyrite-poor massive sphalerite galena ore that locally is up to a few meters thick (grades average 5 to 15% lead and 15 to 35% zinc). Gangue minerals include muscovite, talc, chlorite, quartz, and carbonates. Many of the copper-rich and lead-zinc-rich massive sulphide layers are separated by talcose or phyllitic zones that commonly carry disseminated sulphide mineralization. Calcite is the most common carbonate, but ferroan dolomite and siderite also are present.


Mining Methods

  • Sub-level stoping
  • Avoca
  • Sub-level Retreat
  • Longitudinal retreat
  • Cemented backfill


Summary:

Due to the complex geometry and variability in strike and dip, the development of a tool box of mining methods is recommended in order to maximize extraction of the Stratmat project.

The most of the S1 Deep zone will tend to use transverse Sublevel open stoping (SLOS) supplemented with longitudinal Sublevel Retreat (SLR) open stope mining method when mineralization width is less than 8–12 m. All other zones will be mining using SLR. A small portion of mineralization can be mined using Uppers such as relatively isolated stope and extremity of strike length. A sub-level spacing of 20 m has been selected for these zones. Backfill for the transverse stopes would be cemented rock fill (CRF) for primary stopes and RF and/or CRF for secondary stopes. Backfill for the longitudinal retreat stopes would be a mix of CRF with RF.

A modified Avoca method could also be utilized in some areas of the Main zone and S1 Shallow zone, instead of the more typical SLR. Modified Avoca is an alternative of longitudinal retreat mining method, which has been successfully implemented in Trevali’s Caribou and Santander operations.


Crushing and Grinding


Processing

  • Flotation
  • Dense media separation

Flow Sheet: Subscription required

Summary:

The PEA is based on the construction of a new concentrator at the Stratmat site to process both the Stratmat mineralization and the Halfmile mineralization which will be trucked to the Stratmat site. The new concentrator will have a capacity of 3,000 t/d and employ conventional differential flotation technology to produce three saleable metal concentrates of zinc, lead, and copper. For both the metallurgical performance and the operating costs of a new concentrator, reference has been made to the current operations of Trevali at the nearby Caribou Mine.

The RoM production will initially be subjected to primary and secondary crushing at the Stratmat mine site to reduce the rock size to a suitable feed for a dense media separation plant (DMS). This operation will reject barren material from the +3 mm size from the mill feed effectively increasing the mill head grade and reducing the overall operating costs of the concentrator. A Barely Autogenous Grinding (BAG) mill will be us ........


Combined production numbers are reported under Halfmile-Stratmat Operation

Operational Metrics:

Metrics
Daily milling capacity  ......  Subscription required
Daily ore mining rate  ......  Subscription required
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Tonnes milled, LOM  ......  Subscription required
Annual milling capacity  ......  Subscription required
Annual mining rate  ......  Subscription required
* According to 2017 study.

Reserves at December 31, 2019:

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
Subscription required - Subscription is required.

Proposed Heavy Mobile Equipment as of October 26, 2017:
HME TypeModelSizeQuantityLeased or
Contractor
Concrete sprayer 1
....................... Subscription required 1
....................... Subscription required 1
....................... Subscription required 2
....................... Subscription required 1 Leased
....................... Subscription required 2
....................... Subscription required ....................... Subscription required 1
....................... Subscription required 2
....................... Subscription required ....................... Subscription required 1
....................... Subscription required ....................... Subscription required 4
....................... Subscription required 2
....................... Subscription required 1
....................... Subscription required 1
....................... Subscription required 1
....................... Subscription required 2
....................... Subscription required ....................... Subscription required 3
....................... Subscription required ....................... Subscription required 1
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 5, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
Preliminary Economic Assessment 2017
Management Discussion & Analysis 2015
Technical Report 2015
Preliminary Economic Assessment 2010
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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