The Clapper 4 occurrence is located at an elevation of approximately 1460 metres on an east-facing slope, west of Clapperton Creek and approximately 2.5 kilometres east-southeast of Dartt Lake.

The area is underlain by volcanic and sedimentary rocks of the Upper Triassic Nicola Group. The volcanic rocks consist of andesitic and basaltic flows, augite porphyry, agglomerate, breccia and tuff. These are interbedded with minor argillite, conglomerate and limestone units that define an asymmetric, south-plunging anticline with its axis passing through Swakum Mountain. The Nicola Belt is bounded to the east and west by the Lower Jurassic Nicola and Guichon granodiorite batholiths, respectively.

Locally, an andesite hosts crosscutting fracture zones along the north-trending Fanta fault with narrow quartz carbonate veins, up to 0.25-metre wide, and weak to trace malachite±chalcocite, chalcopyrite and pyrite mineralization. Magnetite is also reported in the area.

Another zone of mineralization is located east of the previous zone, near the Coquihalla Highway, and comprises an andesite to diorite breccia and granodiorite dikes hosting calcite stringers, pyrite and weak malachite.

In 1988, a rock sample (128748) from the main Clapper 4 zone yielded 0.60 gram per tonne gold, 4.8 grams per tonne silver and 0.233 per cent copper, whereas another sample (239796) taken near the Coquihalla Highway to the east of the previous sample assayed 0.425 gram per tonne gold, 1.8 grams per tonne silver and 0.415 per cent copper (Assessment Report 18042).

Work History

The area has been explored in conjunction with the nearby Clapper (MINFILE 092ISE135) occurrence and a completed exploration history can be found there.