The Rig Breccia occurrence is located is located at an elevation of approximately 940 metres on a south-facing slope, approximately 7.5 kilometres southeast of Lhole Tse Mountain.

The area is located at the contact between Early Jurassic monzonite of the Hogem Intrusive Complex and the Lower Jurassic Chuchi Lake Formation of the Takla Group. It is probably related to other epithermal veins near the edge of the Hogem Intrusive Complex; see Skook (093N 140), SRM (093N 104) and GG (093N 209).

The showing is exposed in two old trenches 25 metres apart on both sides of a small stream on the north shore of Chuchi Lake. It consists of a 1.2-metre wide steeply dipping gouge zone that strikes 290 degrees through altered fine-grained plagioclase porphyritic wallrock and hosts vuggy and brecciated epithermal quartz-carbonate veinlets. Sulphides observed in the zone are chalcopyrite, sphalerite, galena, and pyrite. Also occurring are malachite, trace azurite, and strong iron and manganese staining. Two chip samples averaged 0.12 per cent copper, 0.03 per cent lead, 0.61 per cent zinc, 2.5 grams per tonne silver and 0.11 gram per tonne gold over 3 metres (Assessment Report 21820, page 19). Some samples yielded higher values in gold and silver.

The Central Skook zone is located about 400 metres east-southeast of the Rig Breccia zone and consists of fracture-controlled pyrite within fine-grained monzonite. A grab sample yielded 0.05 per cent copper, 0.03 per cent zinc and 0.02 gram per tonne gold (Assessment Report 21820).

On the Central zone, a strong chargeability anomaly occurs along the flanks of a large east trending magnetic high and extends across the northern half of the Skook claims. The zone of chargeability high occurred within an area of fairly high resistivity, suggesting that the cause of the high was not formational (pyritic sediments). A broad zone of moderately anomalous copper in-soils was centred on the induced polarization anomaly. No outcrop occurred within the region and bedrock was interpreted to be Talka Group volcanics, near the southern edge of the Hogem Batholith. Four holes were drilled to test the zone in 1991. Hole SK91-02 intersected plagioclase porphyritic monzonite which was cut by syenite and monzonite dikes. The hole contained 2-4 per cent disseminated pyrite but only traces of chalcopyrite. Potassium-feldspar alteration was weak to moderate and epidote-chlorite alteration was minimal. The best copper value was 0.09 per cent over 14 metres with 0.032 gram per tonne gold (Assessment Report 21820).

Another zone of mineralization is reported to be located approximately 1.6 kilometres east-southeast of the Rig Breccia zone. The zone comprises a porphyritic latite breccia pipe hosting quartz-carbonate veins with pyrite and galena.

Work History

The occurrence is reported to have been first discovered in the 1950s by Bill Rigler.

In 1967, Tro-Buttle Exploration Ltd. completed a program of soil sampling and geological mapping on the area as the Jay claims.

In 1971, the SRM 1-20, 25-66, and CIR 1-20 claims were held by S.E.R.E.M. Ltd. Work during the year included geological mapping, a geochemical soil survey, and a 37.7 line-kilometre magnetometer survey. Further work during 1973 included a geochemical survey comprising 345 soil and 17 silt samples.

Nation River Resources Ltd. staked the Skook 3-6 claims in 1987 to cover old showings. These may have included the Creek (093N 083), Skook (093N 140) and Rig Breccia (093N 208) which occur within these claim boundaries. Initial work by Nation River during the fall of 1987 and spring of 1988 focused on gold; a small program of soil (173) and rock (99) sampling, prospecting, and hand trenching returned significant values in gold, copper, and silver from veins in propylitically altered Takla volcanics near hypabyssal alklic intrusions. Samples (CL84 and CL86) from the Rig Breccia zone yielded up to 2.0 per cent zinc, 21.8 grams per tonne silver and 0.300 gram per tonne gold (Assessment Report 18073).

Also, in 1988, Noranda Mining and Exploration Inc. completed a program of soil sampling on the surrounding area as the Klaw 1-9 claims.

In 1990, B.P. Resources Canada Ltd. optioned the Skook 3-6 and 16 claims from Nation River and conducted a helicopter-borne electromagnetic-VLF-EM survey of 210 line-kilometre over the property. The Wit was now covered by the Skook 16 claim. Purpose of the survey was to delineate magnetite-bearing intrusions that could host porphyry copper-gold deposits (Assessment Report 21108). During 1991 B.P. also cut and soil sampled 64.35 kilometre of line, collecting 1250 soil and 59 rock samples. B.P. also ran 66.5 kilometre of induced polarization surveys on the SKOOK 3-6 and 16 and 17 claims and completed 1243 metres of NQ diamond drilling in 11 holes (Assessment Report 21820).

The Skook claims were returned to Nation River Resources Ltd. in 1992.

In 1994, Nation Rivers excavator trenching and pit digging on western portions of the Skook property. Trenches S-1 and S-2 were dug in the South Zone (093N 140) where hand trenches had previously exposed copper-gold mineralization. Five trenches were dug in the central zone to check for extension of the CL 11 Zone (093N 140) (Assessment Report 24172). (Probably not the Central zone of 093N 208.) Trenches were sampled and map. It was reported that no economic mineralization was found.

In 2002, Nation River Resources Ltd completed 227 metres of BQ diamond drilling in two holes on the Skook mineral claims (Assessment Report 27087). A BQ diamond drill hole (SKO2-01) was collared at the CL II (093N 140) to test gold mineralization previously found trench. Hole SKO2-02 was collared within a few hundred metres to the northwest of SKO2-01.

During 2009 through 2019, Ronald J. Bilquist conducted programs of prospecting, rock, and soil sampling and geological mapping on the area as the Chuchi 1-10 claims.

In 2010, seven samples (CH-0015 through CH-0021) of mineralized quartz vein from the Rig Breccia zone yielded from 0.007 to greater than 1.00 per cent copper, 0.021 to greater than 1.00 per cent lead, 0.518 to greater than 1.00 per zinc, 1.1 to 69.8 grams per tonne silver and 0.049 to 1.083 grams per tonne gold (Assessment Report 31649).

In 2012, two samples (CH073 and CH074) yielded values of up to 0.24 gram per tonne gold, 0.221 per cent copper, 0.735 per cent lead and greater than 1.00 per cent zinc (Assessment Report 33403).

In 2020, Cirrus Gold Corp. completed a program of prospecting, geological mapping, rock sampling and an airborne magnetic survey on the area as the Chuchi South project.