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File Created: 15-Feb-86 by Eileen Van der Flier Keller(EVFK)
Last Edit:  27-Aug-15 by George Owsiacki(GO)

Summary Help Help

NMI
Name COAL RIDGE, MOUNT GORMAN Mining Division Liard
BCGS Map 093I030
Status Prospect NTS Map 093I01E
Latitude 54º 10' 16" N UTM 10 (NAD 83)
Longitude 120º 00' 16" W Northing 6006714
Easting 695528
Commodities Coal Deposit Types A04 : Bituminous coal
Tectonic Belt Foreland Terrane Overlap Assemblage
Capsule Geology

The Coal Ridge occurrence coal seams are located about 900 metres south of the peak of Mount Gorman, east of Gorman Creek along the British Columbia-Alberta border, about 123 kilometres south-southeast of Tumbler Ridge.

The region is underlain by an assemblage of sedimentary rocks consisting mainly of continental margin and shelf facies rocks. This assemblage was deposited on and to the west of the ancestral North American craton. These sedimentary rocks, for the most part typical miogeoclinal facies, range in age from Hadrynian to Upper Cretaceous. Structurally these rocks are part of the Foreland Thrust and Fold Belt of the North American Cordillera.

The coal measures of the region occur mainly in Cretaceous sediments deposited unconformably on older miogeoclinal strata. These sediments were subjected to fold and thrust tectonics which also affected the older rocks.

Only the lowest four coal seams in the Lower Cretaceous Gates Formation (Fort St. John Group) are present in the Coal Ridge area. They are interbedded with siltstones, sandstones and mudstones. Beds dip southwest, strike northwest and consist of a remnant of the northeast limb of a large and gentle syncline. No other folds or faults are apparent. The Lower Cretaceous Gething Formation (Bullhead Group) contains a seam approximately 3.05 metres thick at the top of the formation.

The lowest coal seam (#1) lying immediately above the Torrens sandstone, although 3.7 to 9.1 metres in adjoining areas (average 6.1 metres), is 1.8 to 2.7 metres thick in outcrop at Coal Ridge.

Seam #2 is approximately 3.7 to 4.6 metres thick and about 15 metres above coal seam #1. The thickness of the sandstone between coal seams #1 and #2 is apparently highly variable as they are only 4.5 to 6 metres apart in outcrop in Wolverine Creek, to the north about 4.8 kilometres.

Seam #3 is thinner (0.3 metre) and locally up to 1.5 metres thick and lies about 27 metres above seam #2.

Seam #4 is 5.5 to 6.1 metres thick in outcrop at Coal Ridge; it averages 9.1 metres in adjoining coal licences. The coal seam lies about 21 metres above seam #3. There is only 3 to 9 metres of sandstone overlying seam #4 on Coal Ridge.

The seams on a dry basis contain from 16.57 (seam #4) to 35.40 per cent (seam #1) ash, 22.24 per cent (seam #1) to 26.09 per cent (Gething seam) volatile matter, 42.36 per cent (seam #1) to 54.91 per cent (Gething seam) fixed carbon, 0.31 per cent (Gething seam) to 0.37 per cent (seams #1, #2 and #4) sulphur.

Preliminary reserve calculations indicate between 4.0 and 4.5 million tonnes of raw coal reserves present in the area (seams #1, #2, #4 and the Gething seam; Coal Assessment Report 549).

Bibliography
EMPR COAL ASS RPT *549
EMPR FIELDWORK 1991, pp. 65-82
EMPR GEOS MAP 2003-2
EMPR MAP 65 (1989)
EMPR OF 1992-1; 2006-13
GSC BULL 328
GSC MAP 1424A; 1869A
GSC OF 1150
GSC P 89-4
Placer Dome File

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