The Monte Christo occurrence is located 500 metres northwest of the Caledonia (082KSW041), on the west side of Rossiter Creek.

Silver-lead-zinc mineralization occurs in the Triassic Slocan Group, locally consisting primarily of black fissile phyllites with interbedded limestone, calcareous phyllites and brown gritty quartzites. The general structural trend is 310 degrees, dipping generally southwesterly. Greenstones and ultramafic rocks of the Permian Kaslo Group unconformably underlie the Slocan Group to the east, also hosting silver-lead-zinc mineralization. Satellite stocks, dikes and sills are generally correlative with the Nelson batholith to the immediate south. Late stage lamprophyre dikes are also common.

Mineralization is hosted in the southern of two main limestone bands which are exposed in the canyon walls of Rossiter Creek. It lies within a fissure zone which has a strike of 065 degrees and a dip of 60 degrees south. Unlike the neighbouring Caledonia, there is no displacement of the limestone band. Galena and sphalerite were observed in sideritic oxidized material hosted in crossfractures in limestone.

A float block at this occurrence was reported to provide 100 sacks of lead ore. Six tonnes of silver-lead ore yielded 1474 grams silver and 4329 kilograms lead in 1907 (Geological Survey of Canada Memoir 184, page 237). In 1946, 19 tonnes production was reported grading 624 grams per tonne silver and 25 per cent lead (Bulletin 22). This production was mostly from 1927 (GSC Memoir 184, page 237).