Moon River’s Davidson NPV jumps to $879M: economics and design notes for mine planners
Reviewed by Joe Ashwell

First reported on MINING.com
30 Second Briefing
Moon River Moly’s updated PEA lifts the Davidson underground molybdenum-copper-tungsten project’s after-tax NPV to C$1.23 billion at an 8% discount rate and cuts payback to 1.5 years, driven by a switch from gravity separation to tungsten flotation and revised capex/opex. The 10,000 t/d, 20-year operation now targets average annual output of 13.27 million lb molybdenum, 1.5 million lb copper and 1.51 million lb WO₃, with all-in sustaining costs of $4.36/lb Mo net of by-products. Tungsten resources are upgraded to 80.8 million tonnes measured and indicated, and the mine plan includes battery-electric equipment, paste backfill and dry-stack tailings.
Technical Brief
- Updated PEA assumes long-term prices: US$23.41/lb Mo, US$4.65/lb Cu, US$43.25/lb WO₃.
- Using September 2026 average prices, after-tax NPV increases to C$3.0 billion and IRR to 57%.
- Initial capex now C$750.1 million, including C$118.5 million contingency; previous estimate C$672.3 million.
- Tungsten output in the 2025 PEA was 334,000 lb WO₃ per year, now more than quadrupled.
- Upgraded resource: 80.8 Mt measured and indicated at 0.182% Mo, 0.037% Cu, 0.036% WO₃.
- Existing underground development exceeds 2.1 km of exploration tunnels within Hudson Bay Mountain, 9 km from Smithers.
- Mine design includes underground processing plant, paste backfill and dry-stack tailings to minimise surface footprint.
- Baseline environmental studies and First Nations engagement underway ahead of a planned PFS in H1 2027.
- Moon River also owns 25% of the nearby Endako molybdenum mine, currently under restart evaluation.
Our Take
With Moon River Moly’s Davidson project in British Columbia modelled on long-term molybdenum and copper prices, it stands out in our database as one of the few polymetallic moly–copper–tungsten projects with a 20-year mine life, which could give it optionality to cycle through multiple commodity price regimes.
The updated all-in sustaining cost for molybdenum at Davidson, net of copper and WO₃ credits, places it towards the lower end of cost assumptions seen in recent molybdenum-focused pieces in our coverage, signalling potential resilience if moly prices soften from the September 2026 levels used in the upside case.
Moon River’s 25% interest in the idled Endako molybdenum mine, combined with the planned Davidson development near Smithers, positions the company as a more regionally concentrated moly player in central British Columbia than most juniors in our mining project database, which may help in sharing infrastructure and regional expertise but concentrates jurisdictional risk.
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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