The Golskeish Quartz mine is located on the south end of Granby Bay on Observatory Inlet, about 7 kilometres south of Anyox. Between 1917 and 1929, the mine periodically supplied the copper smelter at Anyox (103P 021) with gold and silver-bearing silica flux.

The region is underlain by a roof pendant, consisting of volcanic and sedimentary rocks, within the Eocene Coast Plutonic Complex. These rocks have been correlated with the Middle-Upper Jurassic Hazelton Group and the Middle Jurassic Bowser Lake Group. The volcanics consist of variably chloritized pillow and massive basalt with minor mafic tuffs. The overlying sediments consist of argillite, siltstone and sandstone with minor chert and limestone. There are two observable phases of folding in the area, an initial north-northeast trending phase followed by a later east-northeast trending phase.

The deposit consists of a 1.8 metre wide milky white quartz vein developed parallel to bedding in pyritic black argillite. The vein and enclosing hostrocks strike 005 to 010 degrees and dip 52 to 55 degrees east. Mineralization is irregularly scattered throughout the vein and consists of (in order of decreasing abundance): sphalerite, galena, pyrrhotite, pyrite, arsenopyrite, tetrahedrite, chalcopyrite, native silver, native gold and electrum. Native silver occurs in galena as rounded blebs and native gold occurs in both galena and quartz.

A total of 47,846 tonnes of ore was mined, primarily between 1918 and 1929, producing 149,109 grams of gold, 822,053 grams of silver and 1,676,477 kilograms of silica.