The BJB occurrence is located within the southwestern headwaters of Big Creek, approximately 2.1 kilometres northeast of Mount Warner and at an elevation of approximately 2470 metres. The showing is 138 kilometres southwest of Williams Lake, B.C.
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.
Pyrite-pyrrhotite-chalcopyrite mineralization occurs in several places along the intrusive contact and less 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 1991, resampling of the 1973 drillcore yielded 0.257 per cent copper and 8.6 grams per tonne silver over 0.9 metre in hole LG-3 (Assessment Report 22312).
Another zone of mineralization located approximately 1.2 kilometres to the northwest across the ridge and at an elevation of 2550 metres, consists of a 20-centimetre wide felsite (quartz-sericite) sill in contact with an andesitic tuff and hosts up to 1 per cent chalcopyrite and malachite. In 1991, a sample (AKR-24) yielded 0.651 per cent copper and 4.9 grams per tonne silver (Assessment Report 22312).
At one location, approximately 2.5 kilometres to the north-northeast of the main zone, and southwest of Lorn Lake, chalcopyrite occurs within a seam of massive magnetite that cuts the intrusive/volcanic contact at a low angle. In 1969, a blasted bulk sample is reported to have averaged 0.16 per cent copper, 0.01 per cent molybdenum and 0.3 gram per tonne gold (Property File – T.F. Lee [1969-09-01]: Report of Geological Investigation of the Lorne Lake Area).
Minor mineralization also occurs within argillite and greywacke of the Middle Jurassic to Lower Cretaceous Relay Mountain Group.
The area was first staked by Phelps Dodge in 1963. In 1969, Burlington Mines completed a program of trenching on the chalcopyrite-magnetite vein area. 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. Drilling was performed at two locations: one on the west side of the valley and the other on the south east side (Lorn B). Both sites contained intersections of disseminated pyrite-pyrrhotite-chalcopyrite mineralization.
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.
In 2018, a program of silt (12), soil (759) and rock (69) sampling, as well as approximately 2200 hectares of geological mapping was conducted over the area by Ridgeline Exploration (Assessment Report 37864). This work expanded the footprint of calc-alkalic porphyry style mineralization and alteration within the Powell Creek Formation volcanics surrounding the Lorna 1 Stock. A broad zone of weak to moderate propylitic (epidote>chlorite) alteration halo was outlined, extending as far as 3km southwest of mapped intrusion and associated with highly anomalous copper and silver mineralization (up to 2.71 per cent copper and 29 grams per tonne silver in rock). The soil grid completed in 2018 also has expanded the zone of anomalous molybdenum and gold-in-soil identified in 2015 to the southwest across Sluice Creek valley into an area with moderate to strong clay alteration and silicification.
