A single coal seam, equivalent to the seam mined at Camp Robertson (103F 013), occurs in the Anthracite Camp interbedded with sandstone and shale of the Cretaceous Queen Charlotte Group, Haida or Skidegate formations. The seam is 2.7 metres thick and contains 1.4 metres of coal in up to 6 bands of varying thickness. The coal is interspersed with shale and bone coal and the roof is a medium to fine-grained sandstone. The coal contains 1.52 to 5.69 per cent water, 7.59 to 8.69 per cent volatile matter, 42.10 to 80.07 per cent fixed carbon, and 9.72 to 44.38 per cent ash. A number of thin streaks and seams of coal occur in the sandstones and shales underlying the coal seam.

The structure consists of a large flat syncline (equivalent to the west syncline at Camp Robertson) which trends roughly north northwest. The coal bearing strata strike north-northwest and dip approximately 85 degrees southwest on the east limb of the syncline. The high dips are local and probably due to faulting. A northwest trending dip-slip fault separates Queen Charlotte sediments from Middle Jurassic volcanics and sediments of the Yakoun Group immediately northeast of the deposit (GSC Open File 2319).

The strata are intruded by various sills and dikes.

The prospect, located on Anthracite creek, was discovered in 1898.

The opening is an adit on the right bank of the creek driven for 14 metres across the measures which strike north 32 degrees west, and dip 85 degrees southwest. A drift, 3.6 metres from the opening, goes 9 metres southeast in the seam.

A preliminary estimated of probable mineable reserves by Mackay for the Royal Commission on Coal, in 1946, was 4,064,000 tonnes.