Guardian Metal–Montana Mining Association tungsten alliance: pilot flowsheet notes for engineers
Reviewed by Joe Ashwell

First reported on MINING.com
30 Second Briefing
Guardian Metal Resources has formed a tungsten mining and recovery pilot alliance with the Montana Mining Association, Montana Technological University and the US Army Research Laboratory, using 250–400 tonnes of legacy ore from its Tempiute project in Nevada as initial feedstock. Ore will be trucked to a milling and processing facility in Philipsburg, Montana, to test upscaling of tungsten-rich tailings and stockpiles into tungsten metal powder for defence-grade penetrators and other US DoD applications. Guardian recently staked 193 additional claims at Tempiute, expanding its tailings footprint by over 375%, with first ore shipments targeted for late summer 2026 pending metallurgical and pilot-scale test work.
Technical Brief
- Initial feedstock comprises ~250–400 tonnes of stockpiled legacy ore from Tempiute.
- Ore will be road-hauled from Nevada to a dedicated milling and processing facility in Philipsburg, Montana.
- Pilot work is being run jointly by Montana Mining Association, Montana Technological University and the US Army Research Laboratory.
- Tempiute is a skarn-type tungsten–zinc–copper–silver system, formerly the Emerson Tungsten mine, last operated in the 1980s.
- Guardian’s May staking of 193 new claims expanded Tempiute’s tailings footprint by over 375%.
- Metallurgical test work is underway at partner laboratories in both the US and UK ahead of pilot runs.
- Tempiute lies less than 250 miles south-east of Guardian’s Pilot Mountain tungsten project, enabling a Nevada-centred portfolio strategy.
- Tungsten’s 2023 market value was estimated at ~US$5 billion, underpinning the economic rationale for domestic recovery from tailings.
Our Take
Guardian Metal Resources’ move to secure US-based tungsten processing capacity comes shortly after its June 30 PFS for Pilot Mountain in Nevada returned a strong post-tax NPV, signalling the company is positioning downstream capability ahead of a potential fast-track to construction.
The 193 additional claims staked at Tempiute in May, which expanded that Nevada tungsten footprint by more than 375%, mean the initial 250–400 tonnes of legacy ore sent to Philipsburg could evolve into a longer-term feed pipeline if processing tests with Montana Technological University and the Army Research Laboratory prove successful.
Within our 1257 Mining stories, tungsten appears far less frequently than bulk commodities, so Guardian Metal’s clustering of Nevada tungsten moves (land, water rights, and now processing alliances) stands out as one of the more coordinated US critical-mineral build-outs in recent coverage.
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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