A single coal seam, containing low grade bituminous rank coal, occurs in the area interbedded with carbonaceous shale, shale, and sandstone of the Cretaceous Queen Charlotte Group, Haida or Skidegate Formations. The seam averages 2.4 metres in thickness (maximum 2.6 metres) and the total coal content ranges from 0.7 to 1.2 metres. The lowest portion of the seam is a 15 to 20 centimetre thick bright clear coal. Above this are alternating bands of shale, bone coal and coal with minor shale and mineral partings. The seam is directly underlain and overlain by shale.

Analyses for the seam indicates volatile matter contents ranging from 13.92 per cent to 35.25 per cent (generally approximately 25 per cent), fixed carbon 38.56 per cent to 52.58 per cent, ash 19.82 per cent to 43.16 per cent and sulphur 0.50 per cent to 0.92 per cent.

The structure in the area consists of a roughly north-south trending anticline, along the east limb of which the Falls Creek seam can be traced. The strata strike approximately north-south and dip to the east. To the east of the anticline is a narrow north-south trending canoe shaped syncline, while to the west is a flat syncline modified by low undulating folds. The strata locally contain minor folds and are cut by minor faults. The coal is cut by numerous dikes.

Work done on the occurrence includes one 20.7 metre adit and one 9 metre inclined shaft.

Given an average thickness of coal of 0.915 metre underlying a probable area of 2.1 square kilometres, the coal reserve for Camp Robertson would be 2.44 million tonnes (Geological Survey of Canada, Summary Report 1912, page 37).

The showing, first prospected in 1893, is located 3.2 kilometres south of Yakoun Lake at an elevation of 274 metres.

From 1893 to 1913 a number of openings were developed. One adit follows the coal seam under glacial drift, through faulted and broken ground of massive, soft, brownish gray shale, and then slopes 13 degrees for 20 metres. Analysis of the coal showed: water, 0.80 per cent; volatile matter, 23.27 per cent; fired carbon, 51.39 per cent; ash, 24.54 per cent; no sulphur; and a fuel ratio of 2.21.

In 1914, the property was held by Imperial Trust Company of New York. A preliminary estimate of probable mineable reserves by Mackay for the Royal Commission on Coal, in 1946, was 11,200,000 tons.

The property lies within the Yaaguun Suu Wildlife Conservancy; a No Registration Reserve has been established prohibiting Mineral, Placer and Coal exploration and mining.