MCF Mining Approvals IndexData as at 18 October 2026 · from Western Australian Government registers and open data
Western Australian mining project · Operating
Cowcowing Lakes South - Wyalkatchem / Sunnylake
Cowcowing Lakes South - Wyalkatchem / Sunnylake is a Western Australian mining project (operating) in MINEDEX, owned by Sunnylake Holdings Pty Ltd 100%; The Trustee For Westdeen Unit Trust 0%; Westdeen Holdings Pty Ltd, on 7 current tenements held by SUNNYLAKE HOLDINGS PTY LTD. Commodities: Gypsum.
- MINEDEX project
- J00810
- Stage
- Operating
- Owners (MINEDEX)
- Sunnylake Holdings Pty Ltd 100%; The Trustee For Westdeen Unit Trust 0%; Westdeen Holdings Pty Ltd
- Tenement holders
- SUNNYLAKE HOLDINGS PTY LTD
- 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 | 2.20 Mt at 87.6%, 1.9 Mt 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 | 28 kt | 740 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 |
|---|---|---|---|---|
| Cowcowing | Gypsum Industries of Australia | 23 April 2025 | Mine Closure Plan - Cowcowing - J00810 - S0223030 | |
| Cowcowing Lakes | Westdeen Holdings Pty Ltd | 27 March 2020 | Mining Proposal Cowcowing Lakes |
Tenements
| Tenement | Holder | Status | Expires | Commodities | Hectares |
|---|---|---|---|---|---|
| M 70/171 Mining lease | SUNNYLAKE HOLDINGS PTY LTD | Granted | 4 February 2027 | Gypsum | 4 |
| M 70/172 Mining lease | SUNNYLAKE HOLDINGS PTY LTD | Granted | 4 February 2027 | Gypsum | 23 |
| M 70/173 Mining lease | SUNNYLAKE HOLDINGS PTY LTD | Granted | 4 February 2027 | Gypsum | 56 |
| M 70/264 Mining lease | SUNNYLAKE HOLDINGS PTY LTD | Granted | 7 October 2028 | Gypsum | 2 |
| M 70/559 Mining lease | SUNNYLAKE HOLDINGS PTY LTD | Granted | 21 May 2032 | Gypsum | 51 |
| M 70/1078 Mining lease | SUNNYLAKE HOLDINGS PTY LTD | Granted | 8 December 2047 | Gypsum | 10 |
| L 70/195 Miscellaneous licence | SUNNYLAKE HOLDINGS PTY LTD | Granted | 24 October 2040 | Gypsum | 0 |