Overview

Mine Type	In-Situ
Status	Inactive / Suspended
Commodities	Potash
Mining Method	Brine mining
Mine Life	...
Snapshot	Without a funding proposition to consider, the directors of Australian Potash (APC) have made the difficult decision to surrender the LSOP mining leases, which have a high holding cost. The relevant documents have been lodged with the Department of Mining, Industry Regulation and Safety. The Company retains its interest in the exploration license tenure it holds at Lake Wells.

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.

The brine contained in this aquifer sequence is enriched in potassium; the aquifer sequence has a
weighted mean average potassium concentration of 3,345 mg/L and a maximum recorded concentration of 7,380 mg/L. Groundwater levels are essentially at ground surface.

Mining Methods

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Comminution

Crushers and Mills

Processing

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Production

Operational metrics

Personnel

Job Title	Name	Phone	Profile	Ref. Date
.......................	.......................	...........		Sep 16, 2021