The TRS (TR South) occurrence is located on a steep north-northeast–facing slope, south of Twin Creek and approximately 8.5 kilometres northwest of the creeks’ junction with Kwanika Creek. The Takla-Rainbow (MINFILE 093N 082) occurrence is located approximately 2.8 kilometres to the northwest.

Regionally, the area is underlain by undivided volcanic rocks of the Lower Jurassic Twin Creek Formation (Takla Group) that have been intruded by Lower Jurassic monzodioritic to gabbroic intrusive rocks and Lower Cretaceous granitic intrusive rocks of the Hogem Plutonic Suite. A complete summary of regional geology and structure can be found in the Takla-Rainbow (MINFILE 093N 082) occurrence.

Locally, the area is underlain by hematite-altered andesitic volcanic rocks and carbonate-sericite–altered granitic porphyry intrusive rocks that host quartz ± carbonate veins, varying in width from 2 to 40 centimetres and containing variable amounts of disseminated to blebby pyrite and chalcopyrite with trace galena, sphalerite and bornite . The quartz veins are orientated at 165 degrees and dip 30 to 36 degrees east.

In 1986, sampling of the TRS grid yielded values of up to 2.90 grams per tonne gold from a 5-centimetre-wide mineralized quartz vein (sample TRS-127R), whereas mineralized float vein samples yielded values up to 63.00 grams per tonne gold, 35.5 grams per tonne silver, 1.37 per cent copper and 3.20 per cent lead (Assessment Report 15319). Also at this time, three chip samples (TRS-103R, -118R and -124R) of the intrusive host yielded 0.102, 0.350 and 0.200 gram per tonne gold over 1.0, 1.0 and 2.5 metres, respectively, whereas a grab sample (TRS-5R) of the intrusive yielded 0.960 gram per tonne gold (Assessment Report 15319).

In 1987, diamond drilling yielded up to 1.09 grams per tonne gold over 1.52 metres (from 96.32 to 97.84 metres) from a kaolinized and silicified fault zone in a granitic intrusive in hole TRS 87-3, 1.06 grams per tonne gold over 1.52 metres (2.74 to 4.26 metres down hole), including 0.490 per cent copper over 0.62 metre from a oxidized andesitic volcanic with thin quartz-calcite veinlets in hole TRS 87-1 and 1.62 per cent lead, 2.99 per cent zinc and 254.4 grams per tonne silver over 1.0 metre (from 65.55 to 66.55 metres down hole) from a silicified to quartz-brecciated andesitic volcanic hosting disseminated pyrite in hole TRS 87-4 (Assessment Report 16759).

Also at this time, a 3.0-metre chip sample (TRS4-R) of carbonate-altered and sheared andesite assayed 0.510 gram per tonne gold, whereas a 3-centimetre channel sample (TRS-9) from a chalcopyrite-bearing quartz vein in a granite porphyry yielded 1.250 grams per tonne gold, 3.3 grams per tonne silver and 0.146 per cent copper (Assessment Report 16759).

In 1990, two grab samples (TR-90-D44 and -D45) of quartz veined outcrop yielded 0.30 and 0.02 per cent copper, 4.4 and 2.1 grams per tonne silver with 1.56 and 1.10 grams per tonne gold, whereas three float samples (TR-90-D35, -D36 and R3) taken downslope of the veins yielded values from 0.15 to 2.12 per cent copper, 6.1 to 59.4 grams per tonne silver and 8.29 to 19.43 grams per tonne gold (Assessment Report 22372). Sampling of trenches yielded 1.27 grams per tonne gold over 1.0 metre in trench TR-90-T4 and 3.66 grams per tonne gold, 24.0 grams per tonne silver, 0.54 per cent copper and 1.44 per cent lead over 1.0 metre in trench TR-90-T5 (Assessment Report 22372).

Also at this time, grab samples (TR-90-D5 and -D6) from outcrops of tuff and epidote-altered granite with quartz veinlets and trace chalcopyrite and pyrite, located approximately 500 metres northeast of the main veined zone, yielded values of up to 11.7 grams per tonne silver and 0.93 gram per tonne gold (Assessment Report 22372).

Work History

The area has been explored in conjunction with the nearby Takla-Rainbow (MINFILE 093N 082) occurrence and a complete exploration history can be found there.

In 1986, Imperial Metals completed a program of prospecting, geological mapping and geochemical (rock and soil) sampling on the TRS, TRS2 and TRN grids of the Takla-Rainbow property. On the TRS and TRS #2 grids, several large gold anomalies, up to 450 by 150 metres and 500 by 75 metres, and numerous smaller gold anomalies were present. Numerous silver anomalies were present, the largest measuring 500 by 150 metres. Numerous copper anomalies were also present, primarily on the western part of the TRS grid.

In 1987, Imperial Metals exploration program included geochemical soil sampling, geophysical induced polarization and very low frequency surveys, geological mapping, prospecting and four diamond drill holes on the TRS grid of the Takla-Rainbow property. Soil sampling of the TRS grid indicated the continuation of gold anomalies to the south and west of previous sampling with the exception of the southwest corner. The highest anomaly recorded was 2360 parts per billion gold located near a 25-metre-wide shear/fault zone (Assessment Report 16759).