The Sunday occurrence is situated along the confluence of Haygarth Creek and Ottertail River, just east of the Canadian Pacific Railway, in Yoho National Park about 28 kilometres east of Golden.

Highly cleaved, soft, greenish calcareous slates and argillites of the Middle Cambrian Chancellor Group are host to fluorite-calcite veins which occur along and across the bedding of the slate, and as pockets along fractures or small faults. The veins contain sphalerite, galena, pyrite, chalcopyrite and minor tetrahedrite.

In 1921, a sample of a little ore which had been left near the top of the shaft, consisting of galena and sphalerite in a calcite gangue, assayed 17.8 per cent zinc, 25.7 per cent lead, 178.2 grams per tonne silver and 0.34 gram per tonne gold (Minister of Mines Annual Report 1921, page G123).

Workings prior to 1911 included a 22-metre adit in the upper part of the river bank and a 30-metre shaft sunk near river level. In 1901, six tonnes of ore, reportedly extracted from the bottom of the shaft, was shipped to a smelter. In 1921, an adit was driven in talus or clay-like material for 38 metres.