The Lois Creek Lower adit is located at the headwaters of Lois Creek at an elevation of 838 metres.
The adit and surrounding trenches lie within the Cretaceous Coast Plutonic Complex near its western boundary with the Insular Belt. The complex consists of diorites and granodiorites enclosing a northwest trending belt of Lower Cretaceous Gambier Group volcanic rocks and sediments. The bedding strikes 345 degrees parallel to the borders of the belt and dips vertically to steeply eastward.
Mineralization consists of pods and lenses of massive sphalerite, chalcopyrite, pyrrhotite and minor galena and arsenopyrite developed within steeply dipping shears, which trend 330 to 005 degrees and 060 to 100 degrees. Shearing is believed to be continuous between the upper (north) and lower (south) adit area, a distance of greater than 700 metres. The shearing is also believed to cut graphitic argillites, chlorite-rich tuffs and andesite flows and/or sills. Overall, the massive shear-controlled mineralized pods appear to be spatially related to the argillite-chlorite tuff contact although some mineralization occurs within both of these units.
From a 2.5 metre wide area in the adit, 5 chip samples assayed an average of 0.21 per cent copper, 0.39 per cent lead, 9.46 per cent zinc, 86.1 grams per tonne silver and 1.37 grams per tonne gold (Assessment Report 11641).
In 1998, two samples from the Lower adit yielded 2.42 and 2.20 per cent lead, 32.6 and 29.5 per cent zinc, 48 and 49 grams per tonne silver with 0.88 and 0.21 gram per tonne gold over 0.6 and 1.1 metre, respectively (Assessment Report 25570).
In 2001, samples from the Lower adit assayed up to 0.97 per cent copper, 0.22 per cent lead, 7.38 per cent zinc and 166.4 grams per tonne silver over 0.5 metre (Sample 304054; Assessment Report 26631).
In 2005, a rock chip sample (05-ROX-1) taken from an outcrop located 95 metres south east of the Lower adit assayed 1.24 per cent lead, 28.1 per cent zinc and 47.9 grams per tonne silver over 0.3 metre (Assessment Report 27861).
The Mount Diadem area has received intermittent exploration since the 1920s. In 1927, Brittan R. Mining Co. drove two small adits 1.5 kilometres northwest and 2.0 kilometres north-northwest of Mount Diadem, respectively. Between 1947 and 1950, Inco Canada Ltd. and Bralorne Mines excavated several open cuts and a short adit in the area of the headwaters of No Man's Creek. In 1954, Copper Ridge Silver Zinc Mines Ltd. held 19 claims in the area. In 1965, Vanco Explorations Ltd. held 17 claims northwest of Mount Diadem, called the Linda group. Citation Explorations Ltd. held 73 claims and optioned the Linda group in 1967. Tiger Silver Mines optioned the Linda group in 1970, and carried out geochemical and geophysical surveys. In 1971, Brittan R. Syndicate optioned the 23 claims and performed geophysical and geochemical surveys. The claims lapsed and were restaked by Fury Explorations Ltd. (Diadem claim) and R. Schmidt (Fox claim). In 1982, Anaconda Canada Explorations Ltd. performed a regional stream sediment survey in the Mount Diadem area. In the following year, an exploration program was carried out on the optioned Diadem and Fury, and other staked claims surrounding Mount Diadem. White Channel Resources Inc. staked the Rox 1 to 5 claims and conducted property exploration in 1991 and 1992. In 1994, Noranda Exploration Company Limited optioned and explored the Rox claims which included the Lois Creek Trench showing for volcanogenic massive sulphide-type mineralization. In 1995 and 1996, Navarre Resources completed programs of rock and soil sampling, geological mapping and eight diamond drill holes, totalling 547.7 metres. Stirrup Creek Gold Ltd. optioned the property in 1998 and completed a program of geological mapping and ground electromagnetic and magnetic surveys on the area. During 2001 through 2005, Fundamental Resources completed programs of rock and soil sampling, geological mapping and 3.0 line-kilometres of ground electromagnetic and magnetic surveys on the area. In 2009, Sunshine Global Mining purchased the Rox claims and completed a minor program of sampling. In 2013, Fundamental Resources completed a program of rock sampling and geological mapping. In 2015, Asia New Energy Corporation completed 112.0 line-kilometres of combined airborne magnetic and radiometric surveys on the area.
