The Tiger-Yellow Cliff (Tiger, Yellow Cliff, Stewart, Winkler, Robertson, Caulfield zones) occurrence is located along the Jordan River, approximately 2.3 kilometres north of the community of Jordan River.
The area is underlain by basalt of the Eocene Metchosin Volcanics and gabbroic and diabase intrusions related to the coeval Sooke Gabbro. The basalt and gabbroic rocks are sheared, brecciated and altered. Granitic intrusions have formed large breccia zones with hornblendite and pegmatites intruding and filling the brecciated older rock.
The Yellow Cliff zone is located on the east of the Jordan River, near the border of the Tiger (L.838) and Black Hornet (L.828) crown grants. The zone strikes north 30 degrees west and dips vertically. It is hosted by basalts and consists primarily of hornblende, quartz, feldspar with chalcopyrite and lesser pyrrhotite and possible chalcocite. In 1949, trench no. 2 yielded 3.3 per cent copper, 58.1 grams per tonne silver and 0.7 gram per tonne gold over 1.5 metres (Property File - unknown [unknown]: Notes, Letters and Reports on Sunro Mine). Other samples are reported to have yielded 2.00 per cent copper over 2.4 metres (Property File - Jordan River Mines Ltd. (1973-01-01): Annual Geological Report 1972 - Sunro). In 2004, a rock sample (S-04-AR-5) assayed 0.716 per cent copper, 4.6 grams per tonne silver and 0.165 gram per tonne gold (Assessment Report 27472).
The Tiger zone is located on the Tiger (L. 838) crown grant and approximately 150 metres east of the Yellow Cliff zone. The zone is hosted at the contact of the gabbro and basalt units and strikes north 50 degrees west with a vertical to 70- degree east dip. The zone has been traced over 90 metres and hosts chalcopyrite and pyrrhotite with hornblende, feldspar and quartz. In 1949, hole 36 yielded 1.58 per cent copper over 6.0 metres (Property File - unknown [unknown]: Notes, Letters and Reports on Sunro Mine). The zone is reported to possibly contain 108,862 tonnes averaging 1.8 per cent copper (Property File - G.E. Winkler (1961-05-01): Report - Jordan River Camp, V.I.). In 2004, a rock sample (S-04-AR-4) assayed 0.437 per cent copper (Assessment Report 27472).
The Stewart zone located east of the Tiger zone on the northwest corner of the Vulcan No.3 crown grant. The zone consists of hornblende, pyrrhotite and magnetite with lesser chalcopyrite and pyrite in a gabbro host. It strikes north-south with a dip of 75 degrees to the north east and has been exposed by pits and trenches over an area of 72 by 42 metres. In 1949, samples yielded from 0.52 per cent copper over 0.75 metre to 0.32 per cent copper over 1.5 metres (Property File - unknown [unknown]: Notes, Letters and Reports on Sunro Mine).
The Winkler zone is located is located on the southwest corner of the Vulcan No.2 (L.820) crown grant, at an elevation of 160 metres and approximately 250 metres east-northeast of the Yellow Cliff zone. The zone strikes northeast and is hosted by gabbros near the southern contact with basalt. It has been explored via a 26-metre tunnel. In 1949, a sample from the tunnel yielded 0.4 per copper over 2.4 metres (Property File - unknown [unknown]: Notes, Letters and Reports on Sunro Mine). In 2004, a rock sample (S-04-AR-2) assayed 0.794 per cent copper (Assessment Report 27472).
The Robertson zone is located approximately 100 metres north of the Yellow Cliff zone, on the west side of the Jordan River and near the southeast corner of the Black Hornet (L.828) crown grant. The zone is hosted by basalt and is exposed over approximately 5 metres at the surface. It is reported to average approximately 2.5 per cent copper (Property File - G.E. Winkler (unknown): Report - Jordan River Camp, V.I.). In 1926, trench samples (no. 1087) yielded up to 2.2 per cent copper over 1.08 metres (Property File - C.C. Starr [1926-06-01]: Map of Caulfield Zone - Gabbro Mine).
The Caulfield zone is located at an elevation of 102 metres, approximately 150 metres northwest of the Yellow Cliff zone, on the west side of the Jordan River and near the southeast corner of the Black Hornet (L.828) crown grant. The mineralized zone varies from 4.5 to 6.0 metres wide and consists primarily of chalcopyrite and pyrrhotite hosted by massive basalts south of the gabbro contact. The zone strikes south 60 to 65 degrees west with a 45 dip north and has been traced intermittently by trenching for a distance of 390 metres. In 1926, trench samples (no. 1079) yielded up to 1.6 per cent copper over 2.01 metres (Property File - C.C. Starr [1926-06-01]: Map of Caulfield Zone - Gabbro Mine). Diamond drilling on the zone is reported to have yielded between 2 to 3 per cent copper over 1.5 to 2.1 metres (Property File - unknown [unknown]: Notes, Letters and Reports on Sunro Mine).
The area has been explored in conjunction with the nearby Sunro (MINFILE 092C 073) past-producing mine since 1915. In 2004, A. Kikauka completed a program of soil and rock chip sampling.
