The Winner quarry is located 7.3 kilometres southeast of Greenwood, 2.8 kilometres south-southeast of the Phoenix pit. Gabbro, referred to locally as the "Old Diorite", is quarried from an open cut, crushed and then trucked to Roxul Incorporated Grand Forks plant. Here it is blended with other mineral material and processed into mineral wool. A 10,000-tonne bulk sample was taken in 2000 and production of 17,000 tonnes and 50,000 tonnes occurred in 2001 and 2002 respectively.

The gabbro contains 1 to 2 per cent magnetite and ilmenite, 33 to 47 per cent pyroxene and amphibole, and 51 to 65 per cent plagioclase. The composition of the plagioclase ranges from labradorite to bytownite and yields the required composition of less than 50 per cent silicon dioxide and more than 15 percent aluminum trioxide.

Roxul (West) Inc. operates the quarry.