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File Created: 07-Mar-1995 by Peter B. Reid (PBR)
Last Edit:  01-Jan-1996 by B. Neil Church (BNC)

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NMI
Name PINAUS Mining Division Vernon
BCGS Map 082L032
Status Showing NTS Map 082L05E
Latitude 050º 23' 41'' UTM 11 (NAD 83)
Longitude 119º 36' 45'' Northing 5585782
Easting 314319
Commodities Diatomite Deposit Types F06 : Lacustrine diatomite
Tectonic Belt Intermontane Terrane Quesnel
Capsule Geology

At the Pinaus showing, waterlain, tuffaceous (rhyolite ash) shale and siltstone lie at the base of a rhyolite succession which passes upwards into rhyolite tephra and flows. The diatomaceous earth locally develops at the base of this succession.

These diatomaceous rocks are absorbant, light in colour and weight, and contain a mixture of tuffaceous debris and diatom filaments. The age of these rocks appears to be Miocene based on preliminary evaluations of well preserved fossil leaves and pollen grains (personal communication in 1996 with L. Donaldson, Okanagan College). This would make the rhyolitic succession part of the Miocene Chilcotin Group.

Bibliography
GSC MEM 296
GSC OF 481; 637
GSC P 89-1E pp. 51-60
Church, B.N. (1996): The Geological Setting of Industrial Minerals, Precious Stones and Au-Ag Veins in Tertiary Outliers of the Okanagan-Boundary District (82E, 82L) (in press).
EMPR PFD 833

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