The Iron Mask property is situated on the north side of Silverton Creek at 1067 metres elevation above sea level in the Slocan Mining Division. The showing is on the Iron Mask Reverted Crown grant (Lot 3520).

Regionally, the area lies on the western margin of the Kootenay Arc, in allochthonous rocks of the Quesnel Terrane. In the vicinity of the occurrence, the Quesnel Terrane is dominated by very fine grained clastic sedimentary rocks of the Upper Triassic Slocan Group that include locally weakly metamorphosed argillite, quartzite, limestone and some tuffaceous rocks. These sedimentary rocks are intruded by dikes, sills and stocks of varied composition and origin. Middle Jurassic Nelson intrusions are immediately south of the Slocan Group and are inferred to be the source of granitic sills and dikes found in the area. The Nelson intrusions comprise at least six texturally and compositionally distinct phases ranging from diorite to lamprophyre. The most dominant phase is a medium to coarse grained potassium feldspar porphyritic granite (Paper 1989-5).

On the Iron Mask property the Slocan Group comprises massive argillite, quartzite and limestone. The strata are tightly folded and faulted but generally the beds strike southeast and dip to the northeast. The showing consists of a 50 metre wide fracture zone containing narrow veinlets of quartz, calcite, siderite and sphalerite. The fracture zone strikes northeast and dips 70 degrees northwest. The zone is brecciated and in-filled with quartz veins 1 to 15 centimetres wide. Grab samples collected from the mineralized portions of the shear in 1977 assayed 170 to 340 grams per tonne silver and 20 per cent zinc (Assessment Report 16247). No production is recorded for this occurrence.