The Dunn Creek occurrence is located on Dunn Creek which empties into tbe east side of Duncan Lake.

The Dunn Creek area is underlain by coarse clastic rocks of the Upper Proterozoic Horsethief Creek Group. The rocks in the area have been mapped as amphibolite, dolomitic limestone, marble, quartzite and muscovite schist. The amphibolite is possibly a meta-volcanic rock.

Very coarse scheelite crystals, up to 2 centimetres wide, were discovered in two discordant quartz-sericite-feldspar veinlets at 990 metres elevation along Dunn Creek. The host rock is a pyrrhotite-pyrite-bearing biotite quartzite. A grab sample assayed 3.30 per cent tungstic oxide (WO3). A more representative chip sample across the 30-centimetre wide vein yielded 0.219 per cent tungstic oxide (Assessment Report 13473).

The area was investigated in the 1920s when the Dary and Dismuth (082KNE062), 4 kilometres north, were explored. In 1945, five contiguous claims were staked by R.E. Erdahl and J.E. Pinchbeck in the vicinity of lower Cockle Creek on a northwesterly trend. They were known as the Tin City, Canyon, Old Glory, Cyclone and Erbeck claims. The Tin City (082KNE071) was staked to cover a showing of tin, beryllium and scheelite mineralization. Claims in the vicinity of the Erbeck claim were Crown-granted in about 1900 (Iron Hand (Lot 5668) and Iron Chief (Lot 5669)). Sipald Resources acquired 12 claims covering the area in 1983. Newmont Exploration of Canada Limited optioned the property in 1984. Work by Newmont in 1984-85 included geochemical soil, silt and rock chip surveys, a magnetometer survey, trenching and 794 metres of diamond drilling in 13 holes. During 2007 through 2009, Braveheart Resources Canada Inc. completed programs of prospecting and geochemical (soil and rock) sampling on the area. In 2011, the area was examined by Moose Mountain Technical Services on the behalf of Rainbow Resources Inc. as the Big Strike property.