Three stratigraphic assemblages have been mapped in the area: (1) Upper Palaeozoic sediments and volcanics of the Stikine Assemblage, (2) clastic sediments of the Triassic Stuhini Group, and (3) Lower Jurassic sediments and volcanics of the Hazelton Group.

Four plutonic suites intrude the above; (1) Late Triassic calc-alkaline intrusions coeval with Stuhini Group stratigraphy, (2) Jurassic Copper Mtn, (3) Jurassic Texas Creek and (4) Tertiary Coast Plutonic suite. Metallogenically , Texas Creek potassium feldspar megacrystic porphyries are of primary interest as they are spatially associated with a number of gold deposits and showings in the area.

A massive sulphide deposit discovered during the BC Geological Survey’s 1989 field season is located on the Reg #1 and #3 claims of Skyline Gold Corporation (Johnny Mountain mine site).

The showing consisting of a 10 to 30 centimetre thick horizon of massive sulphides including galena, pyrite, sphalerite, and possible chalcopyrite with minor oxidation to limonite. Approximately 10 per cent of the horizon consists of gangue, primarily quartz.

The deposit is stratiform to metawackes above and below, locally metamorphosed 100 metres to the southeast to hornfels facies. Ages of host rocks are approximately Triassic-Jurassic, lying within the Hazelton Supergroup. The deposit is considered to be of epigenetic hydrothermal origin, possibly associated with local minor shearing. The deposit can be located in two parallel creek beds approximately 250 metres apart.

Trenching and sampling was conducted in 1989 by Sky Creek Exploration for Skyline Gold Corp, but no report of this work was published.

See Johnny Mountain (104B 107) for details of a common work History.