The June 1 occurrence is located on a ridge separating Kiln and Pingston creeks, approximately 2 kilometres west of Upper Arrow Lake.

The area is underlain by rocks of the Thor-Odin gneiss dome of the Proterozoic Monashee Complex and by metamorphic rocks of the Proterozoic to Paleozoic Kootenay Assemblage. The Thor-Odin dome is one of a series of gneiss domes spaced approximately 80 kilometres apart. A central core zone in the dome consists of gneissic and migmatitic rocks. This zone is surrounded by a heterogeneous assemblage of metasedimentary rocks of the Mantling zone and Fringe zone, the latter containing abundant pegmatite and lineated quartz monzonite. The Supracrustal zone, consisting of quartzite, marble, phyllite, schist and metavolcanic rocks, forms a cover to the gneisses.

The mineralized horizon (the Ledge horizon) occurs in an east- west trending succession of metasedimentary rocks of the Mantling zone. The rusty weathering succession consists of a heterogeneous mixture of schist and gneiss, calcareous quartzite, calc-silicate gneiss, marble and amphibolite. The Ledge consists of fine-grained, dark graphitic-sericitic schist, dark quartz-rich schist, calc-silicate gneiss and minor siliceous marble layers. Pyrite and pyrrhotite are disseminated throughout these units resulting in a characteristic rusty weathering.

Within the Ledge conformable mineralization consisting of pyrrhotite, pyrite and sphalerite with minor galena has been traced by outcrop and diamond drill holes for approximately 13 kilometres from Mt. Symons to the west shore of Arrow Lake.

Locally, a 1.0 to 1.5 metre thick conformable bed of massive pyrrhotite-pyrite containing up to 30 per cent sphalerite and minor chalcopyrite and galena. The sulphide-rich strata have been isoclinally folded and overturned to the south.

In 1979, rock sampling yielded up to 1.49 per cent zinc, 0.01 per cent lead and 3.8 grams per tonne silver (Assessment Report 08415).

The area was staked and explored by Cominco during 1947 through 1966 as part of the Big Ledge (MINFILE 082LSE012) property. In 1977, the area was reconnaissance mapped by Metallgesellschaft. During 1979 through 1981, Esperanza Explorations Limited completed programs of geochemical sampling, geophysical surveys and geological mapping. In 1988 and 1989, Noranda Exploration Company completed programs of soil and rock sampling, line-cutting and geological mapping on the area as the Ping Pong claims. In 1992, Teck completed a program of soil and rock sampling, geological mapping, trenching and a magnetometer survey on the area as the Arrow claims. During 2006 through 2010, Zinex Mining completed programs of prospecting, rock sampling and a ground magnetic survey on the area.