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Canada
Strange Lake Project

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 Location:
236 km NE from Schefferville, Quebec, Canada

  Project Contacts:
1200 Avenue McGill College, suite 1100
Montreal
Quebec, Canada
H3B 4G7
WebsiteWeb
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Overview

StagePreliminary Economic Assessment
Mine TypeOpen Pit
Commodities
  • Total Rare Earth Oxides
Mining Method
  • Truck & Shovel / Loader
Processing
  • Flotation
Mine Life30 years (as of Jan 1, 2014)
In 2018 Micon was retained to work in close coordination with Torngat personnel to produce a new block model for the Strange Lake Project and, in December 2019, Micon completed its NI 43-101 Preliminary Economic Assessment (PEA) for Torngat.

Torngat is planning to proceed with a pre-feasibility level study (PFS), including a full-scale pilot work, which may identify opportunities to optimize processing parameters and could result in improvements to the current economic model.

Micon and M.Plan continue to assist and advise Torngat on an as needed basis.


Owners

 
CompanyInterestOwnership
Torngat Metals Ltd. 100 % Direct

Deposit Type

  • Magmatic


Summary:

The Strange Lake deposit is part of a post-tectonic, peralkaline granite complex which has intruded along the contact between older gneisses and monzonites of the Churchill Province of the Canadian Shield.

The granite complex is sub-circular and comprises a series of compositionally and petrographically distinct granites, which can be differentiated based on petrography (one feldspar versus two) and relative concentrations of the REE and HFSE, which generally exhibit unique ranges that are characteristic of each granite. These granites are in sharp contact with the surrounding country rocks and the apparent contact between the granite complex and country rocks is outward dipping at 20º to 30º. A structural zone comprising stockwork fluorite-hematite veining and hematite-fluorite breccia occurs discontinuously along the contact between the SLAC and country rocks. The least fractionated granite is a fine-grained, massive hypersolvus granite and it exhibits the lowest concentrations of REE and HFSE in the complex; it occurs in the geometric centre of the complex. This granite is surrounded by a medium-grained, massive subsolvus granite that exhibits a distinct enrichment in REE and HFSE. Within the subsolvus granite, pegmatite and aplite sheets and dikes occur, and these are the main host to REE and HFSE mineralization and represent the latest, most fractionated phase of magmatism in the complex.

Mineralization of interest at Strange Lake occurs within peralkaline granite-hosted pegmatites and aplites and, to a lesser degree, within the host granites, particularly in intrapegmatitic granites.

Pegmatites and minor aplite (fine-grained pegmatite) comprise gangue with feldspar (potassic>sodic), glassy to white quartz, arfvedsonite, gittinsite, fluorite and various minor accessory minerals including titanite, allanite, pyrochlore and gadolinite, which are readily identifiable in core. Gittinsite and amphibole appear to have generally formed contemporaneously and both exhibit euhedral to subhedral morphologies. Feldspar exhibits a variable paragenetic relationship relative to arfvedsonite and gittinsite, but is commonly somewhat later in complex pegmatites and earlier in simpler, late pegmatites. Quartz is late and interstitial and fluorite, which is commonly dark purple to black, is commonly later than quartz. Arfvedsonite is typically strongly replaced by either coarse bottle green aegirine or red-brown earthy hematite and may be strongly leached to form vugs that are sometimes quartz-hematite lined. Gittinsite is typically altered to a mottled orange-pink to beige colour and spotted with very fine grey-green LREE-bearing allanite, giving a spotted salt and pepper texture. Feldspar is often altered as concentric oscillating zones or mixed hematite and fluorite, giving a mottled, often fractured appearance.

Subsolvus granite, which typically contains very fine-grained dark grey to black rounded inclusions of hypersolvus granite is the most voluminous unit in the Strange Lake Alkali Complex (SLAC) and is the principal host to REE-bearing pegmatites. Minor white-grey mm-scale reaction rims locally wrap around these inclusions. It is typically fine- to mediumgrained (i.e., less than 1 cm) comprising variably altered feldspar (sodic>potassic), intergranular white-grey quartz, subhedral variably altered arfvedsonite, interstitial/poikilitic gittinsite and euhedral ghosts of narsarsukite; wispy pale purple or interstitial dark purple fluorite is ubiquitous. Extensive albitization of the granite creates an overall granular to sugary appearance in the groundmass while arfvedsonite, which commonly exhibits a bimodal grain size of fine mm-scale anhedral grains and relatively coarser-grained euhedral crystals, is variably altered or may be fresh. Similar to arfvedsonite in pegmatites, arfvedsonite is commonly altered either by aegirine, particularly proximal to pegmatites, or earthy brown-red hematite; large portions of the B Zone exhibit fresh arfvedsonite in a variably altered matrix. Narsarsukite, which is grey when unaltered, is often tan-beige, indicating replacement by titanite. Gittinsite is variable in colour, but is commonly partially replaced by dark grey-green LREE-bearing allanite; replacement may take the form of salt and pepper spotting as in pegmatites or as amorphous patches. Alteration typically developed in the host subsolvus granite is not typically developed in the inclusions.


Mining Methods

  • Truck & Shovel / Loader


Summary:

A conventional open pit mining operation is proposed for the extraction of mineralized material from the B Zone rare earth element mineral deposit for the Strange Lake Project.

Mining will be undertaken by Quest using its own equipment and workforce. Specialized contractors will be used for the initial site clearing and initial haul road construction in preparation for the mining equipment fleet. Explosives, blasting agents, fuel and other consumables will be sourced from established suppliers.

The Strange Lake Project resources are contained in a single deposit. The open pit and internal phases were designed using Vulcan software, preliminary geotechnical designs, recommended standards for road widths and minimum mining widths based on efficient operation for the size of mining equipment chosen for the project.


Crushing and Grinding


Processing

  • Flotation

Source: Subscription required

Summary:

The PEA flowsheet comprises crushing, grinding and flotation that will be undertaken as the Strange Lake site, followed by further processing at a facility at Bécancour. Processing at Bécancour will include acid thermal processing (acid bake) and water leaching to extract the payable elements into solution followed by hydrometallurgical precipitation to recover the rare earth elements and yttrium into a mixed REE+Y concentrate. The REE+Y concentrate will be treated to recover individual rare earth and yttrium oxides.

The crushing, grinding and flotation processing facility at Strange Lake is designed to operate for 365 days per year at a design throughput of 1,346,000 t/y for the first 23 years of the mine life. A plant expansion will enable the processing of up to 3,170,000 t/y of lower grade stockpiled mineralized material from year 24 onwards to the end of planned production.

Recoveries & Grades:

CommodityParameterAvg. LOM
Total Rare Earth Oxides Concentrate Grade, g/t 945

Projected Production:

CommodityUnitsLOM
Total Rare Earth Oxides kt 19,478
All production numbers are expressed as concentrate.

Operational Metrics:

Metrics
Stripping / waste ratio 0.92 *
Waste tonnes, LOM 52,868,000 t *
Ore tonnes mined, LOM 57,297,000 t *
Total tonnes mined, LOM 110,165,000 t *
Tonnes milled, LOM 57,297,000 t *
Daily production capacity 1,671 t of concentrate *
Annual processing capacity 1,346,000 t of ore *
* According to 2014 study.

Reserves at April 9, 2014:

CategoryTonnage CommodityGrade
Indicated 278,128 Mt Total Rare Earth Oxides 0.93 %
Inferred 214,351 Mt Total Rare Earth Oxides 0.85 %

Commodity Production Costs:

CommodityUnitsAverage
Total cash costs Total Rare Earth Oxides CAD 628.42 / t *
* According to 2014 study / presentation. Flotation Concentrate.

Operating Costs:

Units2014
OP mining costs ($/t mined) CAD 14.2 *
OP mining costs ($/t milled) CAD  ......  Subscription required
Processing costs ($/t milled) CAD  ......  Subscription required
Total operating costs ($/t milled) CAD  ......  Subscription required
* According to 2014 study.
Subscription required - Subscription is required.

2014 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Sustaining CapEx $M CAD  ......  Subscription required
Total CapEx $M CAD  ......  Subscription required
OP OpEx $M CAD  ......  Subscription required
Processing OpEx $M CAD 6,595
G&A costs $M CAD 315
Total OpEx $M CAD  ......  Subscription required
Gross revenue (LOM) $M CAD  ......  Subscription required
EBITDA (LOM) $M CAD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M CAD  ......  Subscription required
Pre-tax NPV @ 10% $M CAD  ......  Subscription required
Pre-tax NPV @ 8% $M CAD  ......  Subscription required
After-tax NPV @ 10% $M CAD  ......  Subscription required
After-tax NPV @ 8% $M CAD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
Pre-tax payback period, years  ......  Subscription required
After-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.

Proposed Heavy Mobile Equipment as of April 9, 2014:
HME TypeModelQuantity
Dozer ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 9, 2014
....................... Subscription required ....................... Subscription required Subscription required Apr 9, 2014
....................... Subscription required ....................... Subscription required Subscription required Apr 6, 2022
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2019
Preliminary Economic Assessment 2014
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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