The Rambler Quartz mine is located about 1.0 kilometre west of Granby Bay on Observatory Inlet, 2.5 kilometres southwest of Anyox. Quartz was mined between 1920 and 1924 as a source of silica flux for the copper smelter at Anyox (103P 021).

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 Rambler quartz vein is developed along a bedding plane in a steeply dipping sequence of argillite and wacke (grit). The vein strikes 034 degrees for at least 250 metres and dips 50 degrees northwest with a true width of 10 metres. The vein consists of milky white quartz mineralized with traces of pyrite, pyrrhotite and rare sphalerite. The most intensely mineralized portion of the vein assayed trace gold and silver (Property File - Bancroft, 1918, page 53).

The Rambler vein produced 107,712 tonnes of silica between 1920 and 1924. The quartz was reported to be barren of precious metals.