Discovered in 1906, the Maple Leaf group is located between sea level and 152 metres elevation at the mouth of Collison Bay.

In 1908 owners J.H. Gordon and associates bonded the property to the Bellingham Copper Company of Bellingham, Washington, and some work was done under the agreement. Collision Bay Mining Company, Limited, was incorporated in January 1909 to acquire the property, comprising 5 claims, the Black Prince, Mine Fraction, Kenora, Office Fraction, and a half interest in the Shamrock claim. The workings in 1909 included an upper adit (Gordon Tunnel), at the 152-metre elevation, which was 5 metres in length; the No. 1 adit, at an elevation of 107 metres, which comprised a 30-metre cross-cut from which a 30-metre drift and 24-metre winze were driven; and a lower adit, 15-metres in length, which did not reach the mineralization. The mine closed in November 1909.

In 1973 Barrel Resources Ltd. held 40 claims in the Itsa and CU groups, covering the southern and western shores of Collison Bay and including several old properties. Work done in the area included: linecutting and magnetometer survey, 7.4 kilometres; electromagnetic survey, 4.6 kilometres; geochemical soil survey, 97 samples taken on a 30 by 61-metre grid spacing.

Falconbridge Limited sampled on the property in 1985.

Basalts from the Vancouver Group, Upper Triassic Karmutsen Formation are conformably overlain by limestones of the Jurassic to Triassic Kunga Group. Diorites of the Collison Bay Stock, part of the Middle to Late Jurassic Burnaby Island Plutonic Suite, lie to the east.

A vein-like north trending zone, variably replaced by magnetite, pyrrhotite, pyrite and chalcopyrite, occurs within metasomatically altered Karmutsen greenstones. A 2-metre chip sample from the middle adit returned 1.4 per cent copper, 14.7 grams per tonne silver and 0.7 gram per tonne gold (Assessment Report 14189). The vein strikes intermittently for about 250 metres and is up to 4 metres wide.

Grab sampling from the upper adit returned values such as 10.6 grams per tonne of gold, 13.5 grams per tonne of silver and 1.84 per cent copper. Estimate of reserves of the dump material is 1600 tonnes with an average grade of 1.22 grams per tonne gold (Assessment Report 14189).