The Senator past producer is located 3 kilometres east of Eholt, west of Rathmullen Creek.
The area is underlain by limestone and greenstone of the Triassic Brooklyn Group; these rocks are cut by granodiorite of the Jurassic Nelson Intrusions and alkali syenite of the Eocene Coryell Intrusions.
Locally, a series of massive sulfide lenses (pyrrhotite-pyrite-chalcopyrite-arsenopyrite) are exposed in the walls of a water filled, former open pit and in adjacent stripped areas.
The Senator Mine was operated by the Granby Consolidated Mining, Smelting and Power Company Ltd. between 1903 and 1905. Production during this time was 5178 tonnes of ore, yielding 10,618 kilograms of copper, 22,674 grams of silver and 9984 grams of gold. Adjacent claims included the Thirty Seven (Lot 1335), which was referred to as the No. 37, and Victor (Lot 1336). These were Crown granted in 1899 to J.B. Henderson.
In 1969 and 1970, Bayland Mines Ltd., at the request of H. Hoehn, conducted geophysical surveys and geological examination of the area. At the old shaft, referred to as the 'Pack Rat Mine', an irregular shaped body, up to 6 metres in width, of massive pyrite contains pyrrhotite and chalcopyrite. A sample assayed 0.22 per cent copper and 3.4 grams per tonne silver (Assessment Report 2716).
In 1991, Pan Orvana Resources Inc. conducted mapping and geochemical and rock sampling in the area. A rock sample of massive pyrrhotite in the area of the shaft assayed 0.30 per cent copper, 1.2 grams per tonne gold and 6.2 grams per tonne silver (Assessment Report 22105).
In 2007, Knob Hill Silver Inc. completed a program of soil geochemistry and trenching on the Eholt property. Weighted average grades of chip samples from trenching returned values of 1.5 grams per tonne gold, 0.29 per cent copper and 5.4 grams per tonne silver over 7.5 meters and 2.0 meters at 3.4 grams per tonne gold, 0.20 per cent copper and 4.2 grams per tonne silver (Assessment Report 29702).
In 2010, Knob Hill Silver Inc. was acquired by Range Capital Corp. and later changed their name to Open Gold Corp.
In 2011, Open Gold Corp. completed 123.14 metres of diamond drilling at the Senator mine. Highlights include drillhole EH 11-05, which returned 1.55 metres grading 0.826 grams per tonne gold and 12.16 grams per tonne silver (Assessment Report 33121).
