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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
Processing
  • Dewatering
  • Filter press plant
  • Desliming
  • Flotation
  • Magnetic separation
Mine Life13.8 years (as of Jan 1, 2019)
Latest NewsSayona Doubles Québec Lithium Resource Base Amid Surging Demand     March 1, 2022


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.

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
Flow Sheet: Source
Source: Source
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher 1
Cone crusher 2
Ball mill 1

Summary:

Run-of-mine ore (ROM) will be transported from the mine to the crushing plant. The ore will be crushed to a P80 of 9 mm in three stages of crushing. The crushed ore will be stored under a protected dome and conveyed to the ball mill. Crushed ore will be ground using a single-stage ball mill to a P80 of 180 µm.


Processing

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

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.

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
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.6
HME TypeSizeQuantityLeased or
Contractor
Drill (blasthole)
Excavator
Loader 40 t 9 Leased
Truck (dump)

Mine Management:

Job TitleNameProfileRef. Date
Managing Director and CEO Brett Lynch LinkedIn Jul 26, 2021

Staff:

Total WorkforceYear
176 2019

Corporate Filings & Presentations:

DocumentYear
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

News:

NewsDate
Sayona Doubles Québec Lithium Resource Base Amid Surging Demand March 1, 2022
Sayona & Piedmont finalise NAL acquisition; Production plans advance August 30, 2021
Completion of Piedmont investment in Sayona Québec June 8, 2021
Piedmont Lithium Announces Strategic Investment in Quebec Hard-Rock Lithium Developer Sayona Mining January 11, 2021
Sayona edges towards production at Authier lithium project May 28, 2019
Sayona Mining: Authier Lithium Project JORC Mineral Resource Expansion April 11, 2018
Sayona Mining Engages BBA to Complete Authier Lithium Project DFS December 12, 2017
Sayona Mining Announces Updated JORC Mineral Resource Estimate for Authier Lithium Project December 11, 2017

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