The Isaac property is located near the head of Isaac Creek, a northerly flowing tributary of Frances Creek.

The Isaac claim (Lot 5344) was located by H.E. Forster in about 1900 and Crown-granted in 1904. Mr. Forster worked the claim intermittently until 1919 when Paul Denhart, of Seattle, purchased the property. Intermittent operations were continued and in 1921, W.D. McMillan purchased the property. In 1922, the property consisted of 5 claims, the Isaac Crown-granted claim and Isaac Nos. 1, 2, 3 and Isaac Extension, owned by J. Rutherford and associates.

Invermere Mines, Limited, operated the property in 1923. Development work to 1923 consisted of 2 inclined shafts sunk on the vein. The ore shaft is about 4.6 metres and the other is about 17 metres deep. Two 4.6-metre drifts were run on the vein from the deep shaft, one to the southeast at the 10.7 metre level, and the other to the northwest at the bottom of the shaft.

From 1916 to 1924 (not including 1919, 1921 and 1922), 431 tonnes of ore were shipped and 408,164 grams of silver and 151,801 kilograms of lead were recovered.

The Isaac showing is hosted in limestone and quartzite schist of the the Middle Proterozoic Mount Nelson Formation, Purcell Supergroup.

A vein striking 130 degrees and dipping 65 degrees southwest, follows the strike of the formation and varies in width from about 0.46 to 1.2 metres. Galena, with small amounts of pyrite, occurs in the veins as disseminations, bunches and stringers. Mineralization is exposed on the surface for a distance of about 107 metres south of the workings. A greenstone (dolerite) dike occurs just south of the showing but is thought to predate the mineralization.

A sample of the material assayed 6.86 grams per tonne gold, 987.44 grams per tonne silver, 54.6 per cent lead and 3 per cent zinc (Minister of Mines Annual Report 1922, page 184).