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File Created: 24-Oct-1989 by George Owsiacki (GO)
Last Edit:  15-Jan-2018 by Nicole Barlow (NB)

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NMI
Name RHYOLITE, WRT Mining Division Kamloops
BCGS Map 092I047
Status Showing NTS Map 092I07E
Latitude 050º 27' 28'' UTM 10 (NAD 83)
Longitude 120º 42' 24'' Northing 5592043
Easting 662782
Commodities Copper, Zinc Deposit Types
Tectonic Belt Intermontane Terrane Quesnel
Capsule Geology

The Rhyolite occurrence is situated south of Meadow Creek, approximately 4 kilometres southeast of Logan Lake and 35 kilometres north of Merritt.

The area straddles a northwest-trending contact between two volcanic sequences of the Upper Triassic Nicola Group. To the west are plagioclase, plagioclase-augite intermediate pyroclastic and epiclastic breccia, conglomerate, tuff, sandstone, local shale and augite porphyry bodies. The central portion to the east is underlain by aphanitic pillowed mafic flows. The contact between these two sequences hosts the Rhyolite occurrence.

The Rhyolite showing is underlain by grey, green or black amygdaloidal basalt of the Upper Triassic Nicola Group. Varicoloured calcite amygdules occur within an aphanitic groundmass. Several beds of maroon to green volcaniclastic breccia occur within the basalt and contain maroon, subrounded to subangular clasts ranging up to 30 by 15 centimetres. Two northwest-trending, light grey-green, aphanitic, siliceous and pyritic felsic dikes, 3 to 4 metres wide, also occur.

Mineralization occurs in amygdaloidal basalt near the flow-volcaniclastic contact and is related to narrow quartz-carbonate veinlets within shears. Several old trenches indicate the shear zone strikes approximately 335 to 345 degrees and dips steeply west. Pyrite is present with minor chalcopyrite, azurite, malachite and sphalerite. Rock samples from this zone assayed up to 0.377 per cent copper and 0.218 per cent zinc and are weakly anomalous in gold and silver values (Assessment Report 18048).

The Rhyolite occurrence is part of the Bertha property owned by Guy and Christopher Delorme. In 2015, Laurence Sookochoff, working on behalf of the Delormes, carried out a structural analysis and 2 kilometres of localized magnetometer surveying approximately 2 kilometres to the west of the Rhyolite occurrence.

Bibliography
EMPR ASS RPT 17337, *18048, 36058
EMPR EXPL 1988-C111; 1989 pp.119-134
GSC MEM 249
GSC OF 980

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