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

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NMI
Name BONNER'S QUARRY, COBBLE HILL (L.12) Mining Division Victoria
BCGS Map 092B062
Status Past Producer NTS Map 092B12E
Latitude 048º 41' 15'' UTM 10 (NAD 83)
Longitude 123º 36' 32'' Northing 5392896
Easting 455186
Commodities Limestone Deposit Types
Tectonic Belt Insular Terrane Wrangell
Capsule Geology

Bonner's Quarry is located 400 metres west of the Cobble Hill Station of the E & N Railway on Lot 12, 35 kilometres northwest of Victoria.

The quarry is developed in a limestone bed of the Upper Pennsylvanian to Lower Permian Mount Mark Formation, Buttle Lake Group (previously Buttle Lake Formation, Sicker Group). The bed, 30 metres thick, has been traced along strike for at least 120 metres. The limestone is underlain by black chert, which strikes 140 degrees and dips steeply southwest on the east side of the quarry. Conodonts from this quarry indicate a Pennsylvanian to early Permian age (Geological Survey of Canada Map 1553A).

The deposit varies from a fine-grained, greenish grey, dolomitic limestone to a coarse-grained, high calcium, bioclastic limestone containing abundant organic fragments and pebbles in a fine-grained matrix. Nodules and irregular masses of chert are sometimes present. Several thin sections displayed numerous crinoid discs and echinoid spines(?), some bryozoan structures and shell fragments in a fine- grained, argillaceous calcite cement that has been partially replaced by dolomite.

A chip sample taken in 1956 across the 12.2-metre long quarry face contained 40.9 per cent CaO, 8.46 per cent MgO, 5.0 per cent insolubles, 0.76 per cent R2O3, 0.42 per cent Fe2O3, 0.09 per cent MnO, 0.04 per cent P2O5, 0.09 per cent sulphur, 40.8 per cent ignition loss and 0.12 per cent water (Bulletin 40, page 45, Sample 3).

Limestone was produced periodically from a single quarry between 1953 and 1982.

Bibliography
EMPR AR 1947-218; 1953-193;; 1954-183; 1955-197
EMPR BULL *23, pp. 54,55; *40, pp. 44-45
EMPR OF 1992-18, pp. 19-20
EMPR PF (Maps, Letters, Assays, 1982)
GSC MAP 42A; 1386A; 1553A
GSC OF 463
GSC P 72-44; 75-1A, p. 23; 79-30, p. 8
Lockie, D.A. (1957): A Petrographic Analysis of Some Limestones of Southwestern British Columbia, U.B.C. Unpublished B.A. Thesis
EMPR PFD 5498

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