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File Created: 08-Mar-92 by Peter S. Fischl(PSF)
Last Edit:  08-Mar-92 by Peter S. Fischl(PSF)

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NMI 092H10 Cr1
Name RIDGE ZONE, D, GRASSHOPPER Mining Division Similkameen
BCGS Map 092H056
Status Prospect NTS Map 092H10W
Latitude 49º 31' 59" N UTM 10 (NAD 83)
Longitude 120º 54' 09" W Northing 5488830
Easting 651767
Commodities Chromium, Platinum Deposit Types M05 : Alaskan-type Pt+/-Os+/-Rh+/-Ir
Tectonic Belt Intermontane Terrane Quesnel, Plutonic Rocks
Capsule Geology

The Ridge Zone platinum-chromite showing outcrops along a northwest-trending ridge on the southern slopes of Grasshopper Mountain, 10.5 kilometres west-southwest of the town of Tulameen.

The ridge is underlain by dunite and peridotite of the Early Jurassic Tulameen Ultramafic Complex, a zoned Alaskan-type intrusive complex. The dunite contains relatively abundant chromite in a zone trending northwest for 300 metres and varying up to 100 metres in width. Chromite comprises up to 20 per cent of the dunite in this zone (Assessment Report 17170). The mineral forms irregular lenses up to 20 centimetres long and 10 centimetres wide, fracture fillings up to 2 centimetres wide and primary layers of magmatic origin up to 15 centimetres thick.

Elevated platinum values are found in the southern half of this zone of chromite mineralization, with assays of up to 1.445 grams per tonne platinum (Assessment Report 17170, page 10). Analyses of eight samples taken in the southern half averaged 0.418 gram per tonne platinum (Assessment Reports 15516, 17170). Seven samples from the northern half assayed up to 20 percent chromium, yet yielded less than 0.050 gram per tonne platinum (Assessment Report 15516, page 28, Map 2).

This occurrence was sampled and mapped by Newmont Exploration of Canada Ltd. in 1986 and Tiffany Resources Incorporated in 1987.

Bibliography
EM GEOFILE 2000-2; 2000-5
EMPR ASS RPT 128, *15516, *17170, 19825, 27009
EMPR EXPL 1988-B71-B81
EMPR FIELDWORK 1981, pp. 218-222; 1987, pp. 281-294
EMPR OF 1986-7, pp. 6-11; 1988-25; 1990-27, pp. 33,34
EMPR P 1992-6
EMR MP COMM FILE (MR-CR-301.00)
EMR MP Metal Controller File 167-C 1-2-45
GSC EC GEOL No. 13, pp. 89-94 (1934)
GSC MAP 46A; 888A; 1386A; 41-1989
GSC MEM 26, pp. 51,153-155,168-170; 243, pp. 33,34,60
GSC P 85-1A, pp. 349-358
GSC SUM RPT 1923, pp. 84A-101A
CJES Vol. 6, pp. 399-425 (1969); Vol. 24, pp. 2521-2536 (1987)
GCNL Mar. 23, 1987
Findlay, D.C. (1963): Petrology of the Tulameen Ultramafic Complex,  Yale District, British Columbia, unpublished Ph.D. thesis, Queen's  University, 415 pages.

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