The Comstock showing is located 730 metres northeast of Maple Bay on the east side of Portland Canal, 55 kilometres south of Stewart. The area was explored in the early 1900s for copper.

The region is underlain by a roof pendant, consisting of volcanic and sedimentary rocks, within the Eocene Coast Plutonic Complex. These pendant rocks have been correlated with Middle-Upper Jurassic Hazelton Group rocks and overlying upper Middle to Upper Jurassic Bowser Lake Group sedimentary rocks (Geological Survey of Canada Open File 3453). The Hazelton rocks consist of variably chloritized pillow and massive andesite and basalt with minor mafic tuffs. The overlying Bowser Lake 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 occurrence consists of a vein, over 10 metres wide, containing granular textured milky white quartz with up to 10 per cent disseminated chalcopyrite and minor disseminated pyrite. Chlorite inclusions ("chlorite seams") occasionally occur in the vein. The vein is reported to host good gold and copper values (Minister of Mines Annual Report 1911 page 72). Hostrock is reported to be greenstone and chlorite hornblende schist.

In 1911, the Comstock group of claims was owned by the Comstock Mining Partnership and a considerable amount of surface work had been done consisting of opencuts and stripping, resulting in a large body of ore carrying good values in gold and copper. In 2006, TA Minerals completed an airborne geophysical survey over the Maple Bay area. In 2010, a program of MMI soil sampling was completed on the area. In 2014, a program of geological mapping, geochemical (rock and soil) sampling and a 4.3 line-kilometre ground magnetometer survey were completed on the Coastal Copper claim. In 2018, Golden Opportunity Resources Corp. examined the area as the Maple Bay property.