The Golden Sunlight mine is located in Jefferson County in southwestern Montana, 55 kilometers east of Butte and eight kilometers northeast of Whitehall. The property lies on the eastern flank of a fault-bounded mountain range known as Bull Mountain.
Golden Sunlight is mined by conventional open-pit methods. The ore treatment plant uses conventional carbon-in-pulp technology as well as Sand Tailing Retreatment (STR), designed to recover gold that would otherwise be lost in the process.
Golden Sunlight produced 68,000 ounces of gold in 2015, at a cost of sales of $134 million, and all-in sustaining costs of $1,379 per ounce.1 Proven and probable mineral reserves as of December 31, 2015, were 74,000 ounces of gold2 (1.05 million tonnes, grading 2.18 grams per tonne).
In 2016, gold production is expected to be 30,000-45,000 ounces, at a cost of sales of $1,220-$1,420 per ounce, and all-in sustaining costs of $1,200-$1,250 per ounce.1