The ORO showing area is underlain by marine sedimentary and volcanic rocks of the Upper Triassic Stuhini Group, consisting of volcaniclastics, tuffs, tuffaceous breccias, argillites and minor limestone. These are intruded by several small structurally controlled stocks of hornblende diorite to augite porphyry of Triassic or possibly Jurassic age. The rocks are regionally metamorphosed to lower greenschist facies. Faults, with strike directions of 018 to 027 degrees, occur in the area. Gossans, containing ankerite, hematite, pyrite and sometimes chalcopyrite and malachite, occur within the stratified rocks and sometimes adjacent to faults and diorite stocks.
Two skarn alteration zones were located occurring along calcareous argillite-greenstone contacts. Sulphides occur within alteration zones as disseminations, fine veinlets, and coatings on fractures. Sulphides include pyrite and chalcopyrite. A grab sample from an altered diorite containing chalcopyrite as blebs, disseminations, and veinlets, assayed 0.81 per cent copper and 0.86 gram per tonne gold (Assessment Report 12628). About 600 metres to the south a large (700 by 300 metres) quartz-iron-carbonate gossan zone contains pyrite, minor chalcopyrite blebs, limonite, and malachite. A geochemical soil survey over a small grid located one small area anomalous in gold and copper. This is coincident with one of the mineralized skarn-altered contact zones. Another area, tested by a short soil line yielded anomalous values in copper, arsenic and weak values in gold. A VLF-EM survey conducted over the soil grid located two possible conductors, one of them coinciding with the gold-copper soil anomaly.
WORK HISTORY
In 1983 Sage Resources Ltd. acquired the Oro claims which cover a possible south extension of a gold mineralized fault structure on the Chevron ground (Golden Bear).
In 1984, Sage Resources Ltd. Conducted a geological-geochemical-geophysical reconnaissance program on their Oro Claims. A grid was laid out to facilitate soil sampling and VLF-EM surveying over the area which contained copper mineralization. This grid encompassed parts of Oro 2, 5, 6, 7, and 8. The grid consisted of four lines totaling 2.5 kilometres. A total of 99 samples were collected on the grid. In addition to the grid sampling, a short line of 17 samples were collected at 10 metres intervals along the ridge on the Oro 5 claim. Five silt samples were collected, all from Oro 1 claim. Ten rock (grabs) samples were collected from various locations on the property.
In 1986, Sage conducted mapping and property investigation totaling fifteen man-days, collecting some forty-eight rock chip samples over the ORO claims. In general, the values were reported as low with only 5 sample sites being considered worthy of follow-up, four located along the northwest trending fault of ORO 2 and 6 and one on ORO 3 in a saddle in silicified limestones.
In 1992, a BC Geological Survey geological mapping project in the Tatsamenie and Bearskin lakes area resulted in an updated regional geological framework.
In 2019, Brixton Metals Corporation expanded their Thorn property through staking and acquisition of claims including those covering the Oro showing. No work is reported on the ORO since the earliest 1980s.
In 2020, Brixton Metals Corporation completed a program of geochemical (rock and soil) sampling, a 12.5 line-kilometre ground induced polarization survey, a 715 line-kilometre airborne magnetic and electromagnetic survey and 19 diamond drill holes, totalling 5292 metres, on the area of as part of the Thorn property. Drilling was performed on the Outlaw (MINFILE 104K 176) occurrence area.
Refer to the nearby Tan showings (104K 101, 102 and 103) and to Golden Bear mine (104K 079) about 5 kilometres north, for related geological and work history information. Refer to Thorn (104K 031), Chivas (104K 180), East Outlaw (104K 083), Oban (104K 168), Trapper (Inlaw) (104K 078) and Metla (104K 161) for details of the work history of the greater Thorn property.
