U.S. GoldMining Inc. has released a highly positive preliminary economic assessment for its flagship Whistler Gold-Copper Project in Alaska, highlighting strong economics with an after-tax NPV of $2.04 billion, 33% IRR, and a quick 2.1-year payback at base case metal prices. The study outlines a 14.6-year open-pit mine producing 3.6 million ounces of gold equivalent over its life, with elevated output in early years, low costs, and significant upside at current spot prices where NPV surges to nearly $4.88 billion. The project leverages indicated resources primarily from the Whistler deposit, positioning it as a promising large-scale gold-copper development in a mining-friendly jurisdiction.
Whistler Project Shows Strong Path to Development with Compelling Economics
U.S. GoldMining Inc. has unveiled results from its initial economic assessment for the Whistler Gold-Copper Project, demonstrating robust potential for a major open-pit mining operation in Alaska. The assessment, prepared in compliance with both U.S. Regulation S-K 1300 and Canadian NI 43-101 standards, focuses on the project’s three known gold-copper porphyry deposits, with the base case drawing predominantly from indicated resources at the Whistler deposit.
The proposed operation features a conventional open-pit truck-and-shovel mine feeding a 40,000 tonnes per day processing plant that combines flotation and leach circuits. This setup targets high recovery rates of 88.9% for gold and 77.8% for copper, supporting efficient extraction of the polymetallic resource.
Key economic highlights include an after-tax net present value discounted at 5% of $2.04 billion, paired with an internal rate of return of 33.0% and an initial capital payback period of just 2.1 years. These figures are based on conservative base case metal prices of $3,200 per ounce for gold, $4.50 per pound for copper, and $37.50 per ounce for silver. At prevailing spot prices—around $5,000 per ounce gold, $5.85 per pound copper, and $70 per ounce silver—the economics improve dramatically, with after-tax NPV rising to approximately $4.88 billion, IRR climbing to 62.0%, and payback shortening to 1.2 years.
Production projections emphasize front-end strength, with average annual output of 345,000 ounces gold equivalent during the first three years of operations. Over the full 14.6-year mine life, the project is expected to deliver 3.6 million ounces gold equivalent in total, broken down into 2.6 million ounces of gold, 6.9 million ounces of silver, and 592 million pounds of copper. This profile benefits from a higher-grade core at the Whistler deposit that reaches surface, contributing to lower initial strip ratios and accelerated cash flows.
Capital and operating costs remain competitive for a project of this scale. Initial capital expenditure is estimated at $1.28 billion, covering infrastructure, processing facilities, and site development. All-in sustaining costs are projected at $1,046 per ounce of gold on a by-product basis, reflecting the substantial credits from copper and silver output. Gold accounts for roughly 75% of projected value under base case assumptions, with copper contributing about 25% and silver providing additional upside.
The Whistler Project spans a large 53,700-acre land package in the Alaska Range, approximately 105 miles northwest of Anchorage. It encompasses multiple deposits—Whistler, Raintree West, and Island Mountain—along with several exploration targets supported by prior drilling. Historic work includes 257 drill holes totaling over 70,000 meters, establishing indicated resources of 6.5 million gold equivalent ounces and inferred resources of 4.2 million gold equivalent ounces across the deposits. The current PEA primarily incorporates indicated resources from Whistler, leaving considerable potential for resource expansion and integration of nearby zones in future studies.
Infrastructure considerations benefit from Alaska’s supportive mining environment, with access to power, roads, and ports relatively feasible compared to more remote districts. The project’s location and polymetallic nature align well with growing demand for gold as a safe-haven asset and copper as a critical metal for electrification and renewable energy transitions.
This assessment marks a significant milestone, building on the company’s exploration efforts and providing a clear foundation for advancing toward feasibility studies and permitting. The strong base case, driven by surface-accessible high-grade mineralization and favorable metallurgy, underscores Whistler’s viability as a long-life, low-cost producer in a tier-one jurisdiction.
Key Project Metrics at a Glance
Mine Life : 14.6 years
Processing Rate : 40,000 tonnes per day
Average Annual Production (Years 1-3) : 345,000 oz AuEq
Total LOM Production : 3.6 Moz AuEq (2.6 Moz Au, 6.9 Moz Ag, 592 Mlbs Cu)
Initial Capital Cost : $1.28 billion
All-in Sustaining Cost : $1,046/oz Au (by-product basis)
Base Case After-Tax NPV5% : $2.04 billion
Base Case IRR : 33.0%
Base Case Payback : 2.1 years
Spot Price After-Tax NPV5% : ~$4.88 billion
Spot Price IRR : 62.0%
Spot Price Payback : 1.2 years
These results position the Whistler Project as one of the more attractive undeveloped gold-copper assets in North America, with substantial leverage to metal prices and opportunities for resource growth through ongoing exploration.
Disclaimer This article is for informational purposes only and does not constitute investment advice, financial recommendations, or an offer to buy or sell securities. Mining projects involve significant risks, including technical, economic, regulatory, and market uncertainties. Preliminary economic assessments are based on inferred and indicated resources and are preliminary in nature; they do not support mineral reserves or guarantee future production or profitability. Readers should conduct their own due diligence and consult qualified professionals before making investment decisions.