The SILVER SPOT NO. 4 showing is located approximately 2.0 kilometres north of Lightning Peak.
The showing occurs in metavolcanic rock, including metamorphosed tuffaceous sediments, of the Devonian-Triassic Harper Ranch Group which is hosted by granodiorite and diorite of an unnamed Middle Jurassic intrusion. Limestone with minor garnet skarn has been noted in the Harper Ranch Group a short distance to the south of the showing.
The showing consists of several north to westerly-trending quartz veins that are mineralized with pyrite, galena and sphalerite. A 1930 report describes extensive trenching and a short adit. A 30-centimetre wide quartz vein, exposed in the adit, strikes 325 degrees and dips 15 degrees to the northeast. About 50 metres to the south of the adit, a 15-centimetre wide vein strikes north, dips 30 degrees to the east and underlies a quartz porphyry dike. The property is cut by several long trenches, up to 900 metres long; one of which extends 500 metres west to the SILVER SPOT NO. 3 (082ENE028) showing. This trench exposes several small north-south trending veins and quartz porphyry dikes, but an east-west shear zone, projected from the SILVER SPOT NO. 3 showing, has not been proven.
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 SILVER SPOT NO. 4 is near the WATERLOO (082ENE017) mine, 2 kilometres to the west, and has been included in some of the programs covering the WATERLOO property.
From 1968 to 69, International Mine Services Ltd. carried out geochemical and geological surveys and a diamond drill program on the nearby WATERLOO mine property. The SILVER SPOT NO. 4 showing was covered by the PEAK 78 claim during this period. The International Mine Services work program focused on the WATERLOO mine, and little attention was paid to the SILVER SPOT showings.
In 1974, K.L. Daughtry carried out a magnetometer survey over the RHONDDA claim, which covered the AU (082ENE027) and SILVER SPOT LOC. 9 (082ENE026) showings, approximately 1.5 kilometres to the west. 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 WATERLOO Crown grant and the GRIZZ 25-28 claims to the west. Known shear zones and some possible projections were identified.
During the period 1978 to 1980 the SILVER SPOT NO.4 was covered by the GEO 1 claim, held by Amore Minerals Inc. They carried out several programs of soil sampling, VLF-EM and Max-Min electromagnetic surveys to the east. There was no work on the GEO 1 claim recorded.
In 1979, Kelvin Energy Ltd. staked the REN 1 claim over the SILVER SPOT NO. 3 (082ENE028) area and carried out a small program of prospecting, mapping and soil sampling. The results were not encouraging and the property was eventually dropped.
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. A single sample from the showing returned 220.0 grams per tonne silver and 5.45 per cent lead (http://www.towerresourcesltd.com).
