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File Created: 24-Jul-85 by BC Geological Survey (BCGS)
Last Edit:  14-May-86 by Eileen Van der Flier Keller(EVFK)

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NMI
Name DOUGLAS SEAM MINES, DOUGLAS SLOPE, DOUGLAS SHAFT, NEW DOUGLAS SLOPE, NEW DOUGLAS, SOUTHFIELD 1,2,4 SLOPES, SOUTHFIELD 3,5, NO. 5, SOUTH FIELD, CHASE RIVER, NANAIMO COLLIERY, VANCOUVER COAL Mining Division Nanaimo
BCGS Map 092G011
Status Past Producer NTS Map 092G04W
Latitude 49º 08' 59" N UTM 10 (NAD 83)
Longitude 123º 56' 11" W Northing 5444522
Easting 431716
Commodities Coal Deposit Types A04 : Bituminous coal
Tectonic Belt Insular Terrane Overlap Assemblage
Capsule Geology

The Douglas Seam occurs within the Newcastle Member of the Upper Cretaceous Pender Formation (Nanaimo Group) approximately 18 metres above the Newcastle Seam. The seam area extends from Newcastle Island to just south of the Nanaimo River in a north-northwest trending zone. The Douglas Seam has been mined extensively from a workable area of 15.3 kilometres by 2.8 kilometres. The most important mine was the No. 1 mine (092GSW041) which was in operation for 55 years (1883 to 1938) and produced approximately 16,329,000 tonnes. Along strike from the No. 1 mine, and the Douglas Slope and shaft in the north, are the New Douglas Slope, New Douglas mine, 1911 (New Douglas Slope), Southfield No. 1, No. 2, and No. 4 Slopes, Southfield No. 3 and No. 5 mines, Reserve mine (092GSW037), Fiddick and Richardson Slopes (092GSW034) and the Morden mine (092GSW032). To the south of these are the Alexandria (092GSW025) and Granby mines (092GSW051).

The seam is high volatile bituminous in rank and has similar chemical characteristics to the Wellington seam. Other similarities include the rapid and frequent thickness variations and the structural features. Seam thickness averages 1.5 to 1.8 metres and is up to 9.1 metres. Variations in thickness are commonly caused by undulations in the floor which is predominantly shale. The seam is overlain by conglomerate to shale and sandy shale. Rock partings within the seam are common. Structures include pinches, swells, small faults, shears and rolls.

The Douglas seam strikes northwest and generally dips shallowly northeast. Northwest trending faults are common, bounding the area to the west for example, and an east-west to east-northeast set of faults also cut the coal bearing strata. The seam tends to be strongly sheared with abundant slickensides.

Bibliography
EMPR AR 1874-18-19; 1875-616-617; 1876-425,426; 1877-407,408,411-42;  1878-382,385; 1879-250; 1880-433-434,436; 1881-403; 1882-364-365,  371; 1883-415; 1884-427; 1885-504; 1886-243; 1887-284; 1888-331;  1889-296; 1890-384; 1891-581; 1892-551; 1893-1096; 1894-726;  1895-716; 1896-587; 1897-623; 1898-1174; 1899-833; 1900-960;  1901-1206; 1911-230; *1912-257-258
EMPR COAL ASS RPT *92
EMPR FIELDWORK 1987, pp. 441-450; 1988, pp. 553-558
GSC MAP *42-1963; 1069A; 1386A
GSC MEM 51; 69
GSC OF 611
GSC P *47-22; 69-25; *70-53; 89-4
Ditson, G.M. (1978): Metallogeny of the Vancouver-Hope Area,  British Columbia, M.Sc. Thesis, University of British Columbia

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