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Canada
Authier Project

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 Location:
23 km S from Amos, Quebec, Canada

  Project Contacts:
169, Chemin du Quai
La Motte
Quebec, Canada
J0Y 1T0
Phone819-218-3423
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StagePermitting
Mine TypeOpen Pit
Commodities
  • Lithium
Mining Method
  • Truck & Shovel / Loader
Production StartQ2 2023
Mine Life13.8 years (as of Jan 1, 2019)


Owners

Source: p. 6
CompanyInterestOwnership
Sayona Mining Ltd. 100 % Indirect
Authier is wholly owned by Sayona Mining Ltd.
Sayona Québec Inc. - a subsidiary of Sayona Mining Ltd.

Contractors

ContractorContractDescriptionRef. DateExpirySource
unawarded or unknown Logistics and Material Handling Sayona will hire a third-party contactor to provide a turnkey transport service to transport the concentrate from the mine to the port of Montreal using a fleet of 40t b-train tractor-trailers. Nov 11, 2019


Deposit Type

  • Pegmatite

Source: Source

Summary:

The Authier project hosts two separate mineralised spodumene-bearing pegmatite systems including, Authier and Authier North. Authier is 1,100m long, striking east-west, with an average thickness of 25m, ranging from 4m to 55m, dipping at 40° to 50° to the north. The deposit outcrops in the central-eastern sector and then extends under up to 10m of cover in the western and eastern sectors.

Authier North, located 400m north of the main Authier pegmatite, is approximately 500m in strike length, 7m average width, dipping 15° to 20° to the north. The Authier and Authier North pegmatite dykesremain open in all directions. A magnetic geophysical survey has demonstrated that the Authier mineralisation is hosted within a strong east-west trending magnetic low anomaly. Future exploration will focus on identifying extensions of know mineralisation within this structural feature.

The lithium mineralisation at Authier is related to multiple pulses of spodumene-bearing quartz-feldspar pegmatite. Higher lithium grades are related with high concentrations of fine and mid-to-coarse spodumene crystals (up to 4cm long axis) in a mid-to-coarse grained pegmatite facies.


Mining Methods

  • Truck & Shovel / Loader

Source: p.6-7

Summary:

Mining will be undertaken using drill and blast, and conventional bulk mining methods utilising hydraulic excavators and dump trucks delivering ore to the primary jaw crusher or to the ROM stockpile.

Multiple mining phases were developed for the UDFS. The LOM was developed based on a range of constraints and results in a mine life of 14 years.

During the lifespan of the open pit mine, a total of 35.9 Mm3 of waste rocks and 4.38 Mm3 of tailings will be generated for a total of 40.28 Mm3. Sayona Québec has opted for a co-disposal method to store tailings produced at the concentrator and waste rocks from the mine.

The co-disposal strategy consists of using waste rocks to construct peripheral berms and peripheral roads and confining filtered tailings into waste rock cells. This method has the advantage of increasing the stockpile’s global stability and the water drainage efficiency while ensuring long-term physical and geochemical stability. Furthermore, the co-disposal method reduces the site’s footprint.


Crushing and Grinding
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Processing

  • Desliming
  • Flotation
  • Magnetic separation
  • Dewatering
  • Filter press

Flow Sheet: Source
Source: Source

Summary:

BBA designed a concentrator to process roughly 883,000 tpa of ore using conventional flotation technology suitable for a pegmatite orebody that will be located near the open-pit.

The ground ore will be passed through a magnetic separation circuit to remove iron-bearing silicate minerals and then de-slimed prior to mica flotation. Following mica flotation, the slurry will flow to an attrition scrubber and hydrocyclones for de-sliming prior to spodumene flotation. The plant will produce 6.0% Li2O concentrate with 78% lithium recovery.

Magnetic and mica concentrates, slimes, and spodumene flotation tailings will be thickened and filtered prior to co-disposal with mine waste (dry stacking). Truck and loading units will be used to dispatch tailings to the waste rock facility. The spodumene concentrate will be filtered to roughly 6% moisture. The dried spodumene concentrate will be stored in a covered storage area prior to bulk shipment to a port and/or other Canadian offtaker.

Update 2022: Following the acquisition of the NAL mine and concentrator in August 2021, the Authier project’s operating strategy was revised to include only mining operations and waste and water management on-site.

Recoveries & Grades:

CommodityParameterAvg. LOM
Spodumene Recovery Rate, % 78
Spodumene Head Grade, % 1
Spodumene Concentrate Grade, % 6

Projected Production:

CommodityUnitsAvg. AnnualLOM
Spodumene kt 1141,600
All production numbers are expressed as concentrate.

Operational Metrics:

Metrics
Stripping / waste ratio 6.9 *
Daily ore mining rate 2,600 t *
Waste tonnes, LOM 35.9 M cu.m *
Ore tonnes mined, LOM 12.1 Mt *
Annual processing rate 874,594 t *
Annual processing capacity 883,000 t *
Annual ore mining rate 874,594 t *
* According to 2019 study.

Reserves at September 24, 2018:
Mineral Resource and Reserve: 0.55% Li2O cut-off grade.

CategoryTonnage CommodityGradeContained Metal
Proven 6.1 Mt Li2O 0.99 % 60,390 t
Probable 6 Mt Li2O 1.02 % 61,200 t
Proven & Probable 12.1 Mt Li2O 1 % 121,590 t
Measured 6.58 Mt Li2O 1.02 % 67,100 t
Indicated 10.6 Mt Li2O 1.01 % 107,100 t
Measured & Indicated 17.18 Mt Li2O 1.01 % 174,200 t
Inferred 3.76 Mt Li2O 0.98 % 36,800 t
Total Resource 20.94 Mt Li2O 1.01 % 211,000 t

Commodity Production Costs:

CommodityUnitsAverage
Site cash costs (produced) Spodumene USD 303.8 / t *  
Total cash costs Spodumene USD 313.6 / t *  
Assumed price Spodumene USD 693 / t *  
* According to 2019 study / presentation.

Operating Costs:

Units2019
OP mining costs ($/t milled) CAD 25 *
Processing costs ($/t milled) CAD 18.7 *
G&A ($/t milled) CAD 5.5 *
Total operating costs ($/t milled) CAD 52.2 *
* According to 2019 study.

2019 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M CAD 120
Closure costs $M CAD 10.9
Total CapEx $M CAD 211
OP OpEx $M CAD 302.3
Processing OpEx $M CAD 226.7
G&A costs $M CAD 67.1
Total OpEx $M CAD 630.9
Royalty payments $M CAD 20.4
Net revenue (LOM) $M CAD 1,412
EBITDA (LOM) $M CAD 461
Pre-tax NPV @ 8% $M CAD 216
Pre-tax IRR, % 33.9
Pre-tax payback period, years 2.7


Proposed Heavy Mobile Equipment as of November 11, 2019:
Source: Source p.12
HME TypeSizeQuantityLeased or
Contractor
Loader 40 t 9 Leased

Mine Management:

Job TitleNameProfileRef. Date
Managing Director and CEO Brett Lynch LinkedIn Jan 2, 2023

Staff:

Total WorkforceYear
176 2019

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
Corporate Presentation 2022
Corporate Presentation 2020
Press Release 2020
Feasibility Study Report 2019
Press Release 2018
Press Release 2018
Corporate Presentation 2017
Press Release 2017
Press Release 2017
Annual Report 2016
Year-end Mineral Reserves 2016
Preliminary Economic Assessment 2013

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