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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  29-Jun-1989 by Peter S. Fischl (PSF)

Summary Help Help

NMI
Name UCLUELET Mining Division Alberni
BCGS Map 092C093
Status Showing NTS Map 092C13E
Latitude 048º 56' 54'' UTM 10 (NAD 83)
Longitude 125º 34' 28'' Northing 5424907
Easting 311513
Commodities Limestone Deposit Types
Tectonic Belt Insular Terrane Pacific Rim
Capsule Geology

The Ucluelet limestone showing is exposed for 30 metres along the Tofino-Ucluelet Highway, 1.9 kilometres northwest of Ucluelet. The limestone also outcrops for 120 metres along the beach, 300 metres south of the highway exposure.

The showing is associated with brecciated grey chert, dark green basaltic flows, tuffs and ribbon chert of the Jurassic Pacific Rim Complex. All units are extensively faulted. The limestone displays numerous northwest striking, vertical joints spaced 5 to 25 centimetres apart.

The showing is composed of fine-grained, massive limestone containing a few crinoid fragments and numerous coarse-grained calcite veinlets. A chip sample taken at 0.61 metre intervals across 9.14 metres of limestone exposed along the highway, contained 55.13 per cent CaO, 0.33 per cent MgO, 0.60 per cent insolubles, 0.23 per cent R2O3, 0.19 per cent Fe2O3, 0.018 per cent MnO, trace of P2O5, 0.041 per cent sulphur, 43.52 per cent ignition loss and 0.06 per cent water (Minister of Mines Annual Report 1962, page 153, Sample 1).

Bibliography
EMPR AR *1962-113,151-153
EMPR BULL 55 pp.19-24
EMPR FIELDWORK 1989, pp. 503-510
EMPR OF RGS 24, 1990
GSC BULL 23; 40
GSC MAP 1386A
GSC MEM 13
GSC OF 463; 821; 1272
GSC P 72-44; 76-1A; 79-30
Carson, D.J.T. (1968): Metallogenic study of Vancouver Island with emphasis on the relationships of mineral deposits to plutonic rocks, Ph.D. Thesis, Carleton University

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