US GoldMining’s Whistler project economics: capex, returns and mine plan lens
Reviewed by Joe Ashwell
First reported on MINING.com
30 Second Briefing
US GoldMining shares jumped up to 25% to US$15.94 after a preliminary economic assessment for the Whistler project in Alaska outlined a US$2 billion after-tax NPV (5% discount), 33% IRR and 2.1-year payback at US$3,200/oz gold, US$4.50/lb copper and US$37.50/oz silver. At current spot prices, the study projects NPV rising to about US$4.9 billion with a 62% IRR and 1.2-year payback, based on a 126,000 t/d open-pit operation over 14.6 years. The plan envisages two years of construction, US$1.28 billion initial capex and total output of 2.6 Moz gold, 6.9 Moz silver and 592 Mlb copper.
Technical Brief
- PEA mine plan draws solely on indicated resources from the Whistler deposit, excluding Island Mountain and Raintree.
- Whistler is one of three known gold-copper deposits within the broader Whistler project area in Alaska.
- Planned open-pit mining rate is 126,000 tonnes per day over the assessed life of mine.
- Total projected production equals 3.6 million ounces gold equivalent from gold, copper and silver combined.
- First three years target average 345,000 ounces gold equivalent per annum from a higher-grade core at surface.
- Low strip ratio in early years is cited as a key driver of rapid capital payback.
- Base case value contribution is approximately 75% from gold, 25% from copper and minor silver credits.
- Company is scoping a 2026 exploration programme to support a potential pre-feasibility study decision.
Our Take
With an initial capex of $1.28 billion against a market capitalisation of about $196 million, US GoldMining will almost certainly need a mix of strategic investors, streaming/royalty deals or a larger partner to bridge the funding gap if Whistler advances on the current PEA-style economics.
The 75% value weighting to gold and 25% to copper at Whistler positions it among the more gold-heavy copper–gold projects in our Mining database, which could make it more resilient to copper price volatility but also more exposed if current gold strength fades before a construction decision.
A projected 14.6-year mine life with 3.6 million oz gold-equivalent output in Alaska adds a sizeable long-life asset to the relatively small pool of US-based copper–gold projects in our coverage, which may attract attention from North American producers seeking politically lower-risk ounces and pounds.
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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