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File Created: 24-Jul-85 by BC Geological Survey (BCGS)
Last Edit:  26-Apr-96 by Keith J. Mountjoy(KJM)

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NMI
Name SHINGLE CREEK, GREEN MOUNTAIN Mining Division Osoyoos
BCGS Map 082E042
Status Showing NTS Map 082E05E
Latitude 49º 28' 31" N UTM 11 (NAD 83)
Longitude 119º 38' 54" W Northing 5483664
Easting 308155
Commodities Feldspar, Gemstones Deposit Types Q : GEMS AND SEMI-PRECIOUS STONES (diamonds un
Tectonic Belt Intermontane Terrane Plutonic Rocks
Capsule Geology

The Shingle Creek porphyry is located 3.75 kilometres west of Penticton, British Columbia on the Penticton Indian Reserve, adjacent to Shingle Creek.

The porphyry consists of an irregularly-shaped lenticular stock (2 by 7 kilometres) concaved to the south with several large offshoot dikes at the western boundary. It is characterized by large twinned potassium feldspar crystals (1 to 10 centimetres), smaller plagioclase phenocrysts (up to 1.5 centimetres), quartz bipyramid (Herkimer diamond) euhedra/subhedra (up to 1 centimetre) and minor mafic minerals (magnetite and biotite) in a medium to fine grained matrix of similar composition. The stock intrudes diorite and granodiorite phases of the Okanagan batholith and part of its own volcanic pile that consists of rhyolite tuff and breccia containing large broken sanidine phenocrysts.

The bipyramidal quartz crystals (Herkimer diamonds) and the large, commonly twinned, sanidine phenocrysts that weather free of the hostrock are of interest to mineral collectors.

The age the porphyry, based on K-Ar analysis of fine grained, biotite inclusions within sanidine phenocrysts is 52.4 +/- 1.9 Ma (Map 35-Preliminary).

Bibliography
EMPR EXPL *1995-126
ENPR MAP *35 (Preliminary)
GSC MAP 341A; 538A; 539A; 541A; 15-1961; 1736A; 2389
GSC OF 481; 637; 1505A; 1565; 1969
GSC P 37-21; 72-53, p. 58
Western Homes & Living, Oct. 1961

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