The Iron Duke prospect is located on the west side of Lyle Creek, 500 metres northwest of the Doherty occurrence (082KSW035). Kaslo, British Columbia lies 24 kilometres to the southeast.

Limestone is the dominant hostrock of the Iron Duke prospect, forming prominent cliff bluffs which form a dip slope of about 60 degrees. Slate and slaty limestone are also present in underground workings at the neighbouring Doherty occurrence. For a detailed description of the geology of this area refer to the Doherty occurrence.

At the Iron Duke prospect, two adits have intersected calcite veins carrying a little galena. Hostrocks are limestone, a continuation of the limestone hosting the Doherty occurrence.