Data as at 18 October 2026 · from Western Australian Government registers and open data

Western Australian mining project · Care and Maintenance

Londonderry / ARM Mining

Londonderry / ARM Mining is a Western Australian mining project (in care and maintenance) in MINEDEX, owned by ARM Mining Pty Ltd 100%, on 1 current tenement held by ARM MINING PTY LTD. Commodities: Lithium, Tantalum, Niobium.

MINEDEX project: J00830
Stage: Care and Maintenance
Owners (MINEDEX): ARM Mining Pty Ltd 100%
Tenement holders: ARM MINING PTY LTD
Commodities: Lithium, Tantalum, Niobium
Rehabilitation liability: Its rehabilitation liability is in the MCF Mining Index (subscribers): the Mining Rehabilitation Fund estimate, its trend since 2014, company provisions and closure-plan costs

Resources and reserves

Commodity	Resources	Reserves	Latest estimate
Tantalum pentoxide	10 Mt at 0.01%, 588 t contained	—	25 July 2018
Tin oxide	10 Mt at 0.00%, 445 t contained	—	25 July 2018
Rubidium oxide	10 Mt at 0.17%, 18 kt contained	—	25 July 2018
Lithium oxide	10 Mt at 0.30%, 31 kt contained	—	25 July 2018
Cesium oxide	10 Mt at 0.01%, 1,095 t contained	—	25 July 2018
Niobium pentoxide	10 Mt at 0.01%, 1,103 t contained	—	25 July 2018

Current MINEDEX estimates over all the project's sites; resources may include reserves. MINEDEX (DMPE), CC BY 4.0.

Tenements

Tenement	Holder	Status	Expires	Commodities	Hectares
M 15/1362 Mining lease	ARM MINING PTY LTD	Granted	24 May 2028	Lithium, Tantalum, Niobium	22