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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  31-Mar-2009 by Gloria Robinson (GLR)

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Name NECOSLIE RIVER LIMESTONE Mining Division Omineca
BCGS Map 093K040
Status Past Producer NTS Map 093K08E
Latitude 054º 23' 01'' UTM 10 (NAD 83)
Longitude 124º 07' 57'' Northing 6026795
Easting 426451
Commodities Limestone Deposit Types R09 : Limestone
Tectonic Belt Intermontane Terrane Cache Creek
Capsule Geology

A mass of limestone of the Mississippian to Triassic Cache Creek Group forms a 150 metre high ridge extending southeastward for 1.25 kilometres along the north side of the Necoslie River road, 10 kilo- metres southeast of Fort St. James. The deposit lies along the southwest margin of a belt of limestone with minor chert, argillite and greenstone (andesite) up to 10 kilometers wide that extends northwestward from Gordon Lake for 200 kilometres.

The limestone is mostly light grey, medium to fine grained and well fractured. Irregular masses of chert 2 to 15 centimetres thick and up to 30 centimetres long are fairly common. An irregular breccia zone is exposed in the quarry.

A sample composed of chips taken at 0.6 metre intervals across the 15 metre wide quarry face contained 54.82% CaO, 0.24% MgO, 0.75% insolubles, 0.19% R2O3, 0.10% Fe2O3, 0.03% MnO, 0.05% P2O5, 0.003% sulphur and 43.38% ignition loss (Geology, Exploration and Mining in B.C. 1969, p. 392).

A small amount of limestone was produced from a quarry on the northwest end of the ridge a hundred metres off the road sometime previous to 1969.

EMPR GEM *1969-392
EMPR EXPL 1992-69-106
EMPR FIELDWORK 1992, pp. 69-86, 475-482
EMPR OF 1993-9
EMPR PF Placer Dome (J. Cyr (1988): Memo re: Sources of acid neutralizing limestone)
GSC OF 2593, 3182
GSC P 90-1F, pp. 115-120; 91-1A, pp. 7-13
GSC MEM 252, pp. 32-37
GSC MAP 630A; 907A; 1424A