At least two seams of good quality metallurgical coal, with a total thickness of approximately 6 metres, are present in the Hollebeke Mountain occurrence area. In-place, strippable reserves are estimated to be approximately 5 to 6 million tonnes. The coal occurs in the Pennsylvanian to Permian Rocky Mountain Group and previous reports on the area have documented four coal seams, 1.8 metres, 2.4 metres, 3.0 metres, and 4.9 metres thick, respectively, with average volatile matter, fixed carbon and ash plus moisture values of 24 per cent, 57 per cent and 10 to 20 per cent respectively. The coal is medium volatile bituminous in rank.

The Lewis thrust (west dipping) is the main structural feature in the area and places Precambrian limestones of the Purcell strata above the Paleozoic strata. The Flathead fault forms the eastern boundary of the Flathead River Valley graben structure.

Underground mineable reserves may be substantial in the formation which extends below the Lewis thrust and under Hollebeke Mountain. Measured resources are estimated at 6,000,000 tonnes.