The AU showing is located about 250 metres south of Waterloo Creek and approximately 3 kilometres northwest of Lightning Peak.
The showing occurs in a pendant of metavolcanic rock of the Devonian-Triassic Harper Ranch Group which is hosted by granodiorite and diorite of an unnamed Middle Jurassic intrusion.
The showing consists of several north-trending quartz veins that contain pyrite and minor amounts of galena and sphalerite. Argentite has been noted in a polished section. Films of native copper have been observed on quartz fracture surfaces. The veins contain vugs, and sooty decomposition products (wad?) are common. Vein widths vary from 5 to 60 centimetres.
A 1930 report describes approximately 6 veins, all of which strike approximately north-south and dip at high angles to the east or west. A shaft exposes a 25-centimetre wide vein with a 10- centimetre thick lens of massive pyrite, galena, sphalerite and chalcopyrite. Elsewhere, the vein contains streaks and bunches of pyrite. The vein has been traced for about 120 metres. It is terminated by a east-west trending shear zone approximately 25 metres north of the shaft. A grab sample collected in 1930 assayed 4.1 grams per tonne gold, 838 grams per tonne silver, 13 per cent lead, 4.5 per cent zinc (Geological Survey of Canada Summary Report 1930A, page 80A). Approximately 50 metres southwest of the shaft, a 90- centimetre wide, rusty-weathering shear zone contains quartz veining and pyrite. Another vein, lying 10 metres west of the shaft vein, occurs on the footwall of a quartz porphyry dike which dips steeply to the west. This vein is approximately 15 centimetres wide and is sparsely mineralized with pyrite and galena, as are most of the other veins on the property.
The Lightning Peak area has seen extensive exploration since the early 1900s, with most of the exploration effort directed at the numerous polymetallic, shear zone hosted quartz veins in this camp. The AU showing is near the Waterloo mine (MINFILE 082ENE017), 550 metres to the southwest, and has been included in many of the programs covering the Waterloo property.
In 1931, the AU shaft, which had been started in 1930, was deepened to 21 metres with a 22-metre crosscut and a 12-metre drift. The vein, exposed in the drift, varied in width up to 60 centimetres, but averaged 20 centimetres. A quartz porphyry dike is in close proximity to the vein. In 1931, 17.69 tonnes of gold ore was shipped from the AU property (Minister of Mines Annual Report 1931, page A122). This shipment was recorded as production from the Waterloo mine.
In 1966, Bralorne Pioneer Mines Limited carried out a geochemical survey of the Waterloo mine and surrounding area. They were able to trace some quartz veins through areas of overburden on the mine property.
From 1968 to 69, International Mine Services Ltd. carried out geochemical and geological surveys and a diamond drill program on the adjacent Waterloo mine property. No work was recorded on the AU showing.
In 1974, K.L. Daughtry carried out a magnetometer survey over the Rhondda claim, which covered the AU and Silver Spot Loc. 9 (082ENE026) showings. The survey identified lithological contacts but provided little information about shear zones.
In 1974, K.L. Daughtry carried out a magnetometer survey over the Rhondda claim, which covered the AU and Silver Spot Loc. 9 (MINFILE 082ENE026) showings. The survey identified lithological contacts but provided little information about shear zones.
In 1978, W.G. Botel carried out a 16.9 kilometre VLF-EM survey over the area. Known shear zones and some possible projections were identified.
In 2011, Tower Resources optioned the property and completed a program of geological mapping and sampling from outcrops, trenches and dump piles located near old workings. New areas of precious metal enriched rocks were also identified during this work. The 39 samples, collected over an area of 4 by 1.3 kilometres, average 112 grams per tonne silver and 0.9 gram per tonne gold. Highlights from this sampling program included two samples from mineralized vein material that returned up to 141.0 grams per tonne silver, 25.40 grams per tonne gold and 1.8 per cent lead (http://www.towerresourcesltd.com).
In early 2012, Tower Resources conducted a predrilling exploration program consisting of geological mapping, prospecting, ground magnetic and VLF (very low frequency) electromagnetic surveys and confirmation soil geochemistry. Highlights of this sampling program include a grab sample from the AU mine that yielded 794 grams per tonne silver, 45.7 grams per tonne gold, 7.82 per cent lead and 3.63 per cent zinc (Press Release, Tower Resources, November 21, 2012).
Later in 2012, Tower Resources completed a 1200 metre drill program that consisted of 11 drillholes.