British Columbia Ministry of Energy, Mines and Natural Gas and Responsible for Housing
News | The Premier Online | Ministries & Organizations | Job Opportunities | Main Index

MINFILE Home page  ARIS Home page  MINFILE Search page  Property File Search
Help Help
File Created: 27-Oct-1986 by Allan Wilcox (AFW)
Last Edit:  30-Nov-1996 by Keith J. Mountjoy (KJM)

Summary Help Help

NMI
Name HILLSIDE Mining Division Osoyoos
BCGS Map 082E021
Status Showing NTS Map 082E04W
Latitude 049º 14' 35'' UTM 11 (NAD 83)
Longitude 119º 48' 54'' Northing 5458290
Easting 295120
Commodities Silver, Copper, Gold Deposit Types I06 : Cu+/-Ag quartz veins
K01 : Cu skarn
Tectonic Belt Intermontane Terrane Okanagan, Plutonic Rocks
Capsule Geology

The Hillside showing is located 2 kilometres south-southeast of Olalla, British Columbia. It lies near the southern edge of the historic Olalla Gold Camp.

The early history of the Hillside showing is unknown. In 1985, G. Crooker conducted geochemical and geophysical surveys on the Bell and Juniper (Lot 1604) Reverted Crown grants. The following year, prospecting and geological mapping were carried out, during which several old adits were discovered; Adit A on the Juniper Reverted Crown grant (Lot 1604), Adit D to the east of the Juniper Reverted Crown grant and Adits B and C, between the Juniper Reverted Crown grant (Lot 1604) and Dolphin Crown grant (Lot 978s).

The Hillside showing is located near the ultramafic to alkaline Jurassic Olalla intrusion. This intrusion has intruded a sequence of oceanic sediments and volcanics of the Carboniferous to Triassic Shoemaker and Old Tom formations. Black to green chert, light grey quartzite and minor limestone lenses comprise the dominant lithologies. The Shoemaker and Old Tom formations form a broadly folded, east-dipping sequence in the area. The Olalla intrusion consists of a magnetite-bearing pyroxenite peripheral zone to a diorite and syenite core. The pyroxenite is composed primarily of augite with lesser magnetite. Biotite alteration occurs within the pyroxenite. The syenite is fine grained, light grey to buff to pink. Coarse grained syenite dikes occur at the contact with the peripheral pyroxenite zone.

Metasomatic deposits have formed along the contact of the Olalla intrusion with Shoemaker sediments. Mineralization is related to skarns, shearing and quartz veining. Mineralization consists mainly of auriferous and argentiferous pyrite and pyrrhotite with minor chalcopyrite, malachite, azurite and tetrahedrite.

The main hostrock underlying the Hillside showing are quartzite and argillite. These rock types have been intruded by hornblende syenite and quartz-eye porphyry dikes and plugs. The showing has been explored by two adits, now caved. A dump at the adits contains garnet skarn with chalcopyrite. In 1988, the highest values obtained from sampling at the Hillside showing was from a 3 to 6 centimetre wide quartz vein near Adits B and C. A sample, containing chalcopyrite and tetrahedrite mineralization with malachite and azurite staining, yielded 11.21 grams per tonne gold and 589.71 grams per tonne silver (Assessment Report 22256). Samples from several other quartz veins at Adits B and C yielded up to 6.79 grams per tonne gold and 589.71 grams per tonne silver (Assessment Report 22256). A dump sample yielded 0.86 gram per tonne gold, 15.43 grams per tonne silver and 2.14 per cent copper (Assessment Report 17300).

Bibliography
EMPR ASS RPT 11241, 12088, 12116, 14767, *17300, 19963, *22256
EMPR OF 1989-2; 1989-5
GSC MAP 341A; 538A; 539A; 541A; 15-1961; 1736A; 2389
GSC MEM 38; 179
GSC OF 481; 637; 1505A; 1565; 1969
GSC P 37-21
Sturdevant, J.A. (1963): Petrography of the Olalla stock, Okanagan Mountains, British Columbia, unpublished M.Sc. Thesis, University of New Mexico

COPYRIGHT | DISCLAIMER | PRIVACY | ACCESSIBILITY