At Sage Creek, three major coal seams, seams 5, 4 and 2, with thicknesses ranging from 8 to 15 metres, occur in the Jurassic- Cretaceous Mist Mountain Formation (Kootenay Group) interbedded with shale, sandstone and minor conglomerate.

Seam 5 (stratigraphically lowest) is on average 10.7 metres thick and is generally split into an upper and lower seam separated by a carbonaceous shale unit 0.9 to 2.4 metres thick. The upper part of seam 5 shales out to the southwest, resulting in an overall thinning out in that direction.

Seam 4 also occurs as two benches with the benches forming separate seams, seam 4 Upper and 4 Lower on North Hill. Seam 4 Upper averages 8.2 metres thick while seam 4 Lower is 6.1 metres thick. The parting varies in thickness from 0.9 metres in the south slope of South Hill to 12.2 metres in the northeast slope of North Hill.

Coal seam 2 has an average thickness of 3.7 metres and varies from 1.5 metres below the south slope of South Hill to 11.3 metres in the centre of North Hill. At the locations of maximum development the seam is separated into two benches, the lower probably representing seam 3.

Ash contents in samples from the North Hill vary from 14.6 to 30.5 per cent, and in the South Hill from 21 to 42.6 per cent.

The Sage Creek property is cut off to the north by the Harvey fault and consists of an east dipping monocline which strikes north, and dips on average 30 degrees east. The continuity is interrupted by a number of north to northwest trending normal faults subparallel to and probably associated with, the Flathead and Harvey faults. Four faults cut the North Hill, while the number of faults increases to 10 in the smaller South Hill area. The faults are mostly west dipping and steep, however some east dipping faults also occur.

The total in situ reserves within the proposed pit limits were estimated in 1971 at 135 million tonnes of raw coal. Additional potential reserves are southwest of South Hill (potentially 30 million tonnes of raw coal amenable to open pit mining), east of North Hill (approximately 50 million tonnes of raw coal could be available for underground mining assuming all the seams continue to the Harvey fault) and east and southeast of South Hill. In the latter area coal seams persist downdip, however pre-Tertiary erosion has removed the coal to an unknown extent.

Assessment Report 359 reported an Indicated Resource at Area 1 of 48,587,187 tonnes and at Area 2 of25,798,831 tonnes of coal.

A Technical Report by Norwest Corporation for Cline Mining Corporation reported a surface mineable Measured resource of 84,400,000 and Indicated resource of 70,400,000 tonnes.

The Sage Creek coal deposit is within the Flathead Mineral and Coal Reserve was established in 2010; no tenure acquisition, exploration or mining activity are permitted.