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

Western Australian mining project · Care and Maintenance

Lake Brown / Cockburn Cement

Lake Brown / Cockburn Cement is a Western Australian mining project (in care and maintenance) in MINEDEX, owned by Cockburn Cement Ltd 100%, on 5 current tenements held by COCKBURN CEMENT LIMITED. Commodities: Gypsum.

MINEDEX project: J00815
Stage: Care and Maintenance
Owners (MINEDEX): Cockburn Cement Ltd 100%
Tenement holders: COCKBURN CEMENT LIMITED
Parent groups: CRH
Commodities: Gypsum
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
Gypsum	1.10 Mt at 90.0%, 990 kt contained	—	1 January 1958

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

Production recorded in MINEDEX

Commodity	Latest year	That year	All recorded
Gypsum	2001	13 kt	322 kt

Historical: the bulk extract's production records end in 2002.

Mine closure plans

Site	Operator	Latest plan approved	Plan (PDF on GeoDocs)	Closure year
27 - Lake Brown - M77/41 - M77/71 - G77/04 - G77/51 - G77/52 - DVD	ADELAIDE BRIGHTON CEMENT Ltd	2 December 2016	MINE CLOSURE PLAN - 27 March 2016 - Lake Brown - M77/41 - M77/71 - G77/04 - G77/51 - G77/5

Tenements

Tenement	Holder	Status	Expires	Commodities	Hectares
M 77/41 Mining lease	COCKBURN CEMENT LIMITED	Granted	9 August 2026	Gypsum	313
M 77/71 Mining lease	COCKBURN CEMENT LIMITED	Granted	1 September 2035	Gypsum	19
G 77/4 General purpose lease	COCKBURN CEMENT LIMITED	Granted	9 August 2026	Gypsum	1
G 77/51 General purpose lease	COCKBURN CEMENT LIMITED	Granted	16 August 2047	Gypsum	1
G 77/52 General purpose lease	COCKBURN CEMENT LIMITED	Granted	16 August 2047	Gypsum	1