The Shegunia coal occurrence is located on the east bank of the Skeena River, 3 to 5 kilometres above the junction with the Shegunia River (Geological Survey of Canada Memoir 223 and Summary Report 1909).
The host rocks are folded and deformed shales, greywackes and conglomerates of the Lower Cretaceous Kitsuns Creek Formation, Skeena Group.
Three coal seams are exposed which range from 0.6 to 1.6 metres in thickness. Analysis of the two thickest seams are as follows: 20.92 to 21.62 per cent ash, 57.29 to 58.20 per cent fixed carbon, 18.76 to 20.63 per cent volatile matter and 1.18 to 1.42 per cent moisture (Geological Survey of Canada Summary Report 1909).