The Bethlehem (Huestis) property lies within the Early Jurassic-Late Triassic Guichon Creek batholith and straddles an intrusive contact where younger Bethlehem phase quartz diorite and granodiorite forms an irregular embayment in older Guichon variety granodiorite. The majority of the Huestis orebody occurs in Bethlehem quartz diorite which is medium grained and ranges from equigranular to hornblende-biotite porphyry. These rocks are cut by northeast trending, steeply dipping dacite and quartz latite dykes ranging in width from less than 1 metre to 60 metres.

Ore controls are intrusive contacts, north trending faults and closely-spaced fracturing. The Huestis deposit is a true crackle breccia-type porphyry copper deposit where the host rock has been highly fractured and mineralization is widespread and fairly evenly distributed. The orebody is arcuate and exhibits a peripheral zone of propylitic alteration with an inner zone of sericitization. A distinct pyrite halo of restricted size surrounds the orebody. The main copper mineral is chalcopyrite with lesser amounts of bornite. The majority of the deposit's oxide cap has been removed by glaciation. An age date from a sample of a mixture of magmatic and hydrothermal biotite from the Iona ore zone (092ISE006) returned 199 Ma +/- 8 Ma (Canadian Institute of Mining and Metallurgy Special Volume 15).

The Huestis pit was mined from 1970 to 1976 when production was switched over to the Iona pit (092ISE006). See Bethlehem mine (092ISE001) for production statistics.