The Blueberry prospects are located on the first significant tributary of Mowitch Creek. The site is 27 kilometres north- northeast of Pemberton, just above the Hurley Road [Pemberton to Goldbridge] in the Lillooet River Valley.
Regionally, the area is underlain by large roof pendants within batholiths of the Coast Plutonic Complex, which dominate the region. In the Blueberry area, a pendant of the Cadwallader terrane sits within a granodiorite quartz diorite batholith. Overlying this are small remnants of Miocene basalt flows.
Locally, volcanic rocks, possibly of the lower Cretaceous Gambier Group, are predominant. These are typically andesite and dacite tuff and breccia. A prominent northeast- trending shear zone that ranges from 0.01 to 2.5 metres in width cuts the volcanic rock. It has been traced along strike for more than 300 metres. The fault zone is intruded by felsic dikes emplaced parallel [?] to it. Mineralization is comprised of disseminated pyrite and possible sphalerite within the zone and adjacent where felsite dikes intersect the andesite host. Malachite staining is also reported.
A second zone of mineralization, located approximately 220 metres down-slope and on the west side of Mowich Creek, consists of massive pyrite veins in an altered and silicified andesite. The veins average 10 centimetres in width and strike 40 degrees with a dip of 80 degrees to the south east.
In 1997, sampling of the first zone of mineralization is reported to have yielded values up to 0.15 per cent copper and 16.8 grams per tonne gold, whereas sampling of the second zone yielded up to 1.67 per cent copper and 5.0 grams per tonne gold (Assessment Report 26653).
In 2000, a grab sample (170559) from the second zone assayed 1.10 grams per tonne gold (Property File - J. Houle [2000-09-01]: Sample Descriptions and Assays - Renning Blueberry Property Visit).
The Blueberry showings were discovered in the late 1990s, during follow -up prospecting based on BC Geological Survey regional geochemistry data. Examination of historical data suggests that the Blueberry showing has not been previously identified. Work to date has been limited, largely due to difficult access, which is only on foot.
