A 65,000-metric-ton-per-day operation at the Livengood mine project in Alaska would produce 6.4 million ounces of gold over a 21-year span, or an average of around 304,750 oz per year, according to an updated prefeasibility study released by International Tower Hill Mines Ltd. on Nov. 4.

Lying alongside a paved highway about 70 miles north of Fairbanks, the Money Knob deposit at Livengood hosts...