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File Created: 14-Jan-97 by Z. Dan Hora(ZDH)
Last Edit:  14-Jan-97 by Dorthe E. Jakobsen(DEJ)

Summary Help Help

NMI
Name GRANO CREEK Mining Division Greenwood
BCGS Map 082E057
Status Prospect NTS Map 082E10W
Latitude 49º 33' 00" N UTM 11 (NAD 83)
Longitude 118º 47' 04" W Northing 5490129
Easting 370928
Commodities Granite, Dimension Stone, Building Stone Deposit Types R03 : Dimension stone - granite
Tectonic Belt Omineca Terrane Plutonic Rocks
Capsule Geology

The GRANO CREEK quarry is located at the confluence of Grano Creek and the Kettle River on the east side of the valley, 57 kilometres north of Rock Creek. The quarry was opened by Quadra Stone Co. Ltd. in 1994 to sample the stone. No production has been recorded to date.

The quarry is located at the base of a large rock outcrop, almost free of joints, about 50 meters high and 150 metres long in steep cliffs on the Kettle River. It is comprised of porphyrytic, pink granite of the Cretaceous-Tertiary Okanagan Batholith.

The stone is sound, with a smooth surface and no exfoliation features. The orthoclase megacrysts, mostly 1 by 2 centimetres in size, exhibit preferential orientation, probably reflecting flow during emplacement. The stone is uniform in texture with no inclusions or agglomerations of mafic minerals.

The stone is a classic porphyritic, pink granite. The matrix is grey and medium to coarse-grained with pink orthoclase megacrysts, mostly 1 to 2 centimetres long. The matrix comprises quartz, plagioclase and orthoclase with minor biotite, magnetite, chlorite and sericite. The orthoclase megacrysts show some perthitic texture and are frequently cracked. Alteration is minor with some chlorite and iron staining after mafic minerals (much less than 1/2 per cent). The rock has a moderately developed linear(?) fabric defined by a general preferred orientation of the orthoclase megacrysts. The polish of the rock is fair (7/10) with narrow (0.25 milimetre) cracks up to 40 millimetres long and some pitting. This is largely from preferred cracking parallel to cleavage in orthoclase megacrysts that persists into the matrix. Pitting is generally due to small fragments of matrix that have fallen out of the cracks.

Bibliography
EMPR FIELDWORK *1996, pp.301-306
EMPR INFO CIRC 1994-19, p.17; 1995-1, p.17
EMPR OF 1994-8
EMPR RGS 29
GSC MAP 6-1957; 1701A; 1712A; 1713A; 1714A; 1736A
GSC OF 409; 736; 1969

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