Macmahon Majestic underground extension: design and development notes for engineers
Reviewed by Joe Ashwell
First reported on International Mining – News
30 Second Briefing
Macmahon Holdings’ underground subsidiary has secured a 12‑month extension to provide underground mining services at Black Cat Syndicate’s Majestic gold mine in Western Australia, following successful establishment of the underground portal and first access. The contract continues Macmahon’s role in developing stopes beneath the existing open pit, using conventional drill‑and‑blast with truck haulage to surface. For contractors and owners, the extension signals confidence in portal ground support design, early development performance and the viability of Majestic’s underground orebody.
Technical Brief
- Contract extension is for 12 months, locking in short‑term underground development continuity at Majestic.
- Macmahon Underground Pty Ltd is the contracting entity, working for a wholly owned Black Cat subsidiary.
- Scope remains underground mining services only, indicating processing and surface infrastructure are owner‑managed.
- Continuation under the same contractor avoids remobilisation costs and requalification of underground equipment fleets.
- Single‑mine, single‑owner structure simplifies interface risk compared with multi‑asset, multi‑JV underground contracts.
- Short‑duration extension suggests Majestic’s underground plan is being advanced in staged, de‑risked increments.
- Similar WA gold projects often use 12‑month rolling terms to align contractor performance with evolving mine plans.
Our Take
Macmahon Underground’s role at the Majestic gold mine follows closely on its preferred contractor status at the Groundrush decline for the Central Tanami Project JV (21 April 2026), signalling a growing book of Australian underground gold work that can support fleet and workforce utilisation across remote sites.
Within our gold-tagged mining coverage, Western Australia features heavily alongside new processing capacity such as Brightstar Resources’ 1.5 Mt/y Goldfields plant (27 May 2026), suggesting that sustaining contracts like this 12‑month extension are being underpinned by a broader build‑out of regional gold infrastructure.
For Black Cat Syndicate, locking in a defined 12‑month underground contract at Majestic reduces near‑term execution risk during a period when many WA juniors in our database are juggling both mine development and plant upgrade decisions, often with tighter access to owner‑operator underground crews.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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