The Warren-Wolmer occurrence is in the northeastern head waters of Pyramid Creek, approximately 9.5 kilometres northwest of Bootleg Mountain.
Regionally, the area is located within the Purcell Anticlinorium, a broad, gently north-plunging structure with dominantly east-verging thrust and fold structures. The Purcell Anticlinorium is cored by the Proterozoic Purcell Supergroup, which is composed of a siliciclastic and lesser carbonate sequence at least 12 kilometres thick and is deposited in an intracratonic rift basin (the Belt-Purcell Basin).
Locally, the area is underlain by Purcell Supergroup metasediments of the Lower and Middle Aldridge Formations. The Kimberley fault cuts across the northern part of the area along with several other north-trending faults. Among these are the Alki Creek and Murphy Pass faults, the former of which forms the eastern side of the Clair Graben.
The workings and associated mineralization are spatially related to a major north-northwest–trending, second-order thrust fault and lower order crosscutting (east-west) offset faults. The offset faults have developed drag folds along the thrust structure, producing brittle deformation with mineralized quartz structures hosted in the Lower Aldridge fine-grained quartzite and siltstone. Drag folds might be important in hosting some of the mineralization, as in the case of the Warren workings, where a 16-metre wide, highly mineralized quartz structure occurring proximal to a drag fold was mapped and sampled. At a lower elevation, approximately 300 metres south west of the Warren workings, several old trenches were located and cut a shallow-dipping massive quartz structure hosting chalcopyrite, pyrite and arsenopyrite with some very fine-bladed tourmaline crystals. This structure is hosted in a gabbroic sill (Moyie Intrusion) and is distal to the thrust fault.
In 1996, five rock samples (SP-25407 through SP-25410 and SP-25461) from a 1-metre wide quartz vein with strongly disseminated arsenopyrite, galena and sphalerite yielded up to 0.15 gram per tonne gold, 112 grams per tonne silver, 0.174 per cent cadmium and greater than 1 per cent zinc and lead, respectively (Assessment Report 24877).
In 1999, sampling of mineralized veins exposed in trenches yielded up to 1.26 per cent copper, 6.69 per cent lead and 68.1 grams per tonne silver (Sample 7385; Assessment Report 26118).
In 2011, grab samples assayed up to 6.00 per cent lead, 1.61 per cent zinc and 37.2 grams per tonne silver (Assessment Report 32814).
Early exploration in the area consists of several small-scale workings, mainly in quartz veins and shears in the Alki Creek and Upper Pyramid Creek areas, which date to the 1890’s or early 1900’s.
Cominco explored the Pyramid Peak area in the past as part of their regional search for Sedex deposits in the Aldridge Formation, completing a few drill holes in the 1980’s. Cominco continues to hold claims in the area. More recently, during 1996 through 1998, Abitibi Mining Corp. undertook programs of mapping, prospecting and geochemical sampling on the area. Two holes were drilled by Abitibi in the south part of the Pyramid Peak property, near the Saint Mary River.
In 1999 and 2000, Rio Algom Exploration completed exploration programs on the Pyramid Peak property that consisted of geological mapping, rock sampling and the collection and identification of stratigraphic markers. A total of 57 rock samples were collected from surface outcrops for ICP-28 analysis plus gold by fire assay. Samples were collected from mineralized veins, rusty, pyrrhotitic siltstones and fragmental units. The highest values for base and precious metal mineralization were obtained from select sampling of several quartz sulphide veins exposed by old workings. These veins commonly hosted silver, copper, lead and elevated arsenic.
During 2011 through 2013, Electra Gold completed programs of rock sampling, geological mapping and prospecting and a photo-geological interpretation program on the area as the Goldledge property. In 2014, Homegold Resources prospected the area and collected rock samples.
