The Lucky Lorn 3 (Lorn A) occurrence is located within the southwestern headwaters of Big Creek, at an elevation of 2235 metes and approximately 1.8 kilometres northeast of Mount Warner.

The area is underlain by andesite, volcanic breccia and tuff of the Upper Cretaceous Powell Creek Formation. Hornblende-biotite quartz monzonite and quartz diorite of the Tertiary Lorna Lake stock crosscut the volcanic rocks. To the east, undivided sedimentary rocks of the Middle Jurassic to Lower Cretaceous Relay Mountain Group and the Lower Cretaceous Taylor Creek group are exposed.

Locally, pyrite-pyrrhotite-chalcopyrite mineralization occurs in several places along the intrusive contact and lesser so within the plutonic and volcanic rocks. Malachite, azurite, chrysocolla, and bornite occur primarily in the volcanic rocks. Molybdenite occurs locally, associated with quartz and sericite in the plutonic rocks and quartz-amphibole veins in the volcanic rocks. Trace amounts of galena and sphalerite occur locally with the chalcopyrite. Epidote, chlorite, kaolinite and calcite alteration is common.

In 2012, rock samples from the A zone yielded up to 1.27 per cent copper and 18.8 grams per tonne silver (Sample 904R013; Assessment Report 33203). In 2013, rock samples yielded up to 1.86 per cent copper and 306 grams per tonne silver (Sample LPM012; Assessment Report 34367).

The area was first staked by Phelps Dodge in 1963. During 1971 through 1973, Cominco Ltd. completed programs of geological mapping and five diamond drill holes, totalling 454.0 metres, on the area as the Lorn claims. In 1988, Bond Gold Canada Inc. completed 62.9 line-kilometres of combined ground magnetometer and VLF surveys on the area as the Sluice Box claims. In 1991, Lac Minerals Ltd. completed a program of geological mapping and rock, silt, soil and historic drill core sampling on the area as the Sluice claims.

In 2012 and 2013, Royal Sapphire Corp. completed programs of rock, silt and soil sampling, a 260.0 line-kilometre airborne magnetic survey, geological mapping, prospecting and an air photo lineament analysis on the area. In 2015, Jet Gold Corp. completed a program of soil sampling on the area.