The region is underlain by a structurally preseved Paleozoic remnant of a generally shallow marine platform succession over which Proterozoic rocks of both the Purcell and Windermere Supergroups have been thrust. At the base of the Paleozoic succession are thick bedded quartzites and quartz grits of the Lower Cambrian Cranbrook Formation. These in turn are overlain by: dolomites of the Middle Cambrian Jubilee Formation; shale, sandstone and biowacke stones of the Upper Cambrian to Ordovician McKay Group; thick-bedded biowacke stones and peloidal mudstones of the Ordovician and Silurian Beaverfoot Formation; dolomites and dolimitic shales of the Middle Devonian Mount Forster Formation; and thin to medium-bedded dolomitic biowacke stone of the Upper Devonian Starbird Formation.

The most likely area of location for the Puzzle property is underlain by Devonian Mount Forster Formation limestone, slate, siltstone and argilliteCoarse clastic sedimentary rocks of the Upper Proterozoic Horsethief Creek Group underlie the Paleozoic strata to the north at higher elevations.

In 1925, it was reported that the Puzzle property was located a short distance west of the Grotto occurrence (082KNE017) and was owned by J. McCullough and E.J. Morigeau. The Puzzle area is underlain by steeply tilted and uniformly bedded dolomitic limestone and quartzite. Traces of copper have been found on the lower portion of the hill consisting of copper stains along fractures. Traces of lead in decomposed and iron-stained limestone are also found on the lower reaches of the hill. A sample from a shallow opencut yielded 72.00 gram per tonne silver and 2.4 per cent lead (Annual Report 1925, page 223).

The most significant showing on the Puzzle claims are at an elevation of 1875 metres where the rocks are lying at a relatively flat angle. A gossanous outcrop in limestone contains specks of galena. Shallow diggings are reported to indicate a considerable extent to this zone. A sample across 46 centimetres in an opencut assayed 12.3 per cent lead, 7.9 per cent zinc, 66.51 grams per tonne silver and 1.03 grams per tonne gold (Annual Report 1925, page 223).