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Australia
Lake Wells Project

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 Location:
164 km NE from Laverton, Western Australia, Australia

  Project Contacts:
Suite 31, 22 Railway Road
Subiaco
Western Australia, Australia
6008
Phone  ...  Subscription required
WebsiteWeb
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Overview

StagePermitting
Mine TypeIn-Situ
Commodities
  • Potash
Mining Method
  • Brine mining
Mine Life30 years (as of Jan 1, 2019)


Owners

Source:
CompanyInterestOwnership
Australian Potash Ltd. 100 % Indirect
Australian Potash Limited holds a 100% interest in the Lake Wells Sulphate of Potash project.

Contractors

Subscription required - Subscription is required.


Deposit Type

  • Brine
  • Sedimentary


Summary:

A deep palaeovalley (ranging between 150 and 170m in depth) extends along the length of the LSOP area, infilled with predominantly lacustrine clays and sand interbeds of Tertiary age. Seven hydrostratigraphic units have been identified comprising:

• An extensive surficial unit of mixed alluvial/lacustrine sediments comprising:

- Approximately 15m of sandy loam, including local laterite and evaporite deposits, overlying the entire lake area.

- An upper, low permeability, clay-rich unit with minor sand horizons extending across the entire lake area.

- Local areas of permeable calcrete and / or silcrete.

• An upper sand aquifer unit at the base of the surficial unit, occurring at depths ranging between 35 and 70m, with thicknesses varying between 1 and 12m and anticipated to be continuous both along the length and across the width of the palaeochannel.

• A lower clay aquitard comprising puggy lacustrine clay with minor sandy interbeds. Adopted permeability ranging between 0.07 and 0.8 m/d

• A mixed aquifer unit comprising interbedded sand and clay.

• A basal sand aquifer located along the length of the paleochannel and encountered in 25 drill holes. Although predominantly of Tertiary age, in places, there are thin remnants of Permian glacial deposits (conglomerates and diamictites) overlying the Archean basement, which have also been included in this hydrogeological unit.

........


Mining Methods

  • Brine mining


Summary:

Brine abstraction
The bore-field network will be developed into the palaeovalley hosted deposit containing the potassium rich brines. The bore-field network has been designed to meet the required production flow rate. Bores will be developed into the upper and lower (or basal) aquifer units, with leakage of overlying units recharging the abstracted brine.

The bore-field design is based upon an abstraction rate across the network of 540 litres per second (l/s) of brine for the life of mine, producing 100,000 tpa of SOP. Total annual brine abstraction volume into the evaporation pond network is 17 gigalitres per year.

DFS bore-field design includes 78 bores on a nominal spacing of 800 metres. A contingency of 8 bores has been included that will be held on stand-by to cover scheduled maintenance.


Crushing and Grinding


Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Projected Production:
The LSOP will produce a premium suite of products at >50%K2O.

CommodityUnitsAvg. AnnualLOM
Potash Mt 0.24.5
All production numbers are expressed as sulphate.

Operational Metrics:

Metrics
Annual brine extraction 17 M cu.m *
* According to 2019 study.

Reserves at August 28, 2019:

CategoryTonnage CommodityGradeContained Metal
Probable 490 M cu.m Sulfate of potash (SOP) 3.6 Mt
Probable 490 M cu.m Potassium 3325 mg/L 1.6 Mt
Measured 27,678 M cu.m Sulfate of potash (SOP) 7455 mg/L 18.1 Mt
Measured 27,678 M cu.m Potassium 3343 mg/L

Commodity Production Costs:

CommodityUnitsAverage
Cash costs Sulfate of potash (SOP) USD  ......  Subscription required&nbs
Assumed price Sulfate of potash (SOP) USD  ......  Subscription required&nbs
* According to 2019 study / presentation.

2019 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Total CapEx $M AUD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M AUD  ......  Subscription required
Pre-tax NPV @ 8% $M AUD  ......  Subscription required
After-tax NPV @ 8% $M AUD  ......  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.


Heavy Mobile Equipment:

Mine Management:

Job TitleNamePhoneEmailProfileRef. Date
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Sep 16, 2021
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2019
................................... Subscription required 2019
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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