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File Created: 12-Sep-1989 by Peter S. Fischl (PSF)
Last Edit:  01-Jan-0001 by BC Geological Survey (BCGS)

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NMI
Name ORO DENORO LIMESTONE Mining Division Greenwood
BCGS Map 082E018
Status Showing NTS Map 082E02E
Latitude 049º 07' 19'' UTM 11 (NAD 83)
Longitude 118º 32' 42'' Northing 5442161
Easting 387273
Commodities Limestone Deposit Types R09 : Limestone
Tectonic Belt Omineca Terrane Quesnel
Capsule Geology

A limestone lens of the Middle Triassic Brooklyn Formation outcrops on Highway 3, 3.5 kilometres due south of Eholt and continues south-southwest for 1.75 kilometres to the Phoenix Road, 1.6 kilometres west-northwest of the road's conjunction with the highway. The limestone strikes 002 degrees and dips 65 degrees east at the highway outcrop on the north end of the deposit.

The lens is comprised mostly of light grey to white, fine grained limestone with some black to dark grey limestone. Scattered thin, cherty and argillaceous beds occur within the limestone. Streaks of disseminated pyrite are sometimes present. The limestone is intruded by numerous sills and dykes. A sample from an exposure along an old railroad, 800 metres south of the Oro Denoro Mine (82ESE 063), just west of the highway , contained 51.39 per cent CaO, 0.67 per cent MgO, 5.70 per cent SiO2, 0.42 per cent Al2O3, 0.39 per cent Fe2O3 and 0.04 per cent sulphur (Canmet Report 811, p. 202, Sample 60).

A second, 2 kilometre long, subparallel lens of mostly white, medium grained limestone outcrops 500 to 900 metres west of the first lens. Some chert beds and dykes are present within this lens. A sample of chips taken across 90 metres on top of a knoll, 2.5 kilometres northwest of the Phoenix Road-Highway 3 conjunction, contained 48.47 per cent CaO, 0.70 per cent MgO, 11.20 per cent insolubles, 1.04 per cent R2O3, 0.74 per cent Fe2O3, 0.04 per cent MnO, 0.13 per cent P2O5, 0.02 per cent sulphur 38.69 per cent ignition loss and 0.28 per cent water (Minister of Mines Annual Report 1960, p. 143, Sample 6).

Bibliography
EMPR AEROMAG MAP 8497G
EMPR AR 1960-141,143
EMPR MR MAP 6 (1932)
EMPR OF 1990-25; 1992-18, pp. 120, 121
EMPR P 1986-2
EMPR PF (Map of limestone lenses northwest of Grand Forks - in General File)
EMPR PRELIM MAP 59
GSC MAP 828; 45-20A; 6-1957; 10-1967; 1500A; 1736A
GSC OF 481; 637; 1969
GSC P 67-42; 79-29, pp. 14-17
CANMET RPT 811, Part 5, pp. 194,202
EMPR PFD 996, 502955

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