The Lucky Thought occurrence is situated south of Silverton Creek in the Slocan Mining Division. The underground workings are immediately west of Twigg Creek at 1065 metres elevation. This occurrence may be the same as Lucky Spot, which produced in 1976 and was operated by S. Berisoff.
Regionally, the area lies on the western margin of the Kootenay Arc, in allochthonous rocks of the Quesnel terrane. Near the occurrence, the Quesnel terrane is dominated by very fine grained clastic sedimentary rocks of the Upper Triassic Slocan Group that include locally weakly metamorphosed argillite, quartzite, limestone and some tuffaceous rocks. These sedimentary rocks are intruded by dikes, sills and stocks of varied composition and origin. Permian and/or Triassic Kaslo Group metamorphosed volcanic rocks occur to the north of the Slocan Group rocks. Middle Jurassic Nelson Intrusions are immediately south of the Slocan Group and are inferred to be the source of granitic to pegmatitic sills and dikes found in the area. The Nelson Intrusions are composed of at least six texturally and compositionally distinct phases ranging from diorite to lamprophyre. The most dominant phase is a medium- to coarse-grained potassium feldspar porphyritic granite (Paper 1989-5).
The Lucky Thought occurrence is hosted by quartzite, calcareous quartzite and argillites of the Slocan Group that strike 140 degrees and dip 73 degrees northwest. The occurrence is just north of the contact with the Nelson Intrusions and the sedimentary sequence has been affected by contact metamorphism from the emplacement of the nearby intrusions. Near the occurrence, the Nelson Intrusions are composed of medium-grained granodiorite and quartz diorite.
The occurrence consists of a zone of faulting and shearing that strikes 065 degrees and dips 60 degrees northwest. The shear has been explored in four adits over a maximum strike length of approximately 300 metres. Within this length, vein material containing bodies of massive galena, sphalerite and tetrahedrite occurred as lenses up to 1 metre wide. The lenses were separated by crushed wallrock cemented by quartz and calcite. Tetrahedrite appeared to be associated with galena and sphalerite was generally more abundant than galena.
In 1949, a sample from the no.1 tunnel assayed 0.8 per cent lead, 19.9 per cent zinc and 34.2 grams per tonne silver, while a dump sample assayed 0.8 per cent lead, 35.7 per cent zinc and 397 grams per tonne silver (Property File - C.C. Starr [1949-10-01]: Report of a Brief Examination of the Clubine-Comstock Mine).
In 1976, two chip samples (78LJ1 and 78LJ2) of mineralized quartz shear from the No.1 level workings yielded 0.7 and 0.7 gram per tonne gold, 377 and 1573 gram per tonne silver, 0.053 and 0.25 per cent copper, 13.1 and 27.0 per cent zinc with 3.75 and 0.51 per cent lead over 0.927 and 0.305 metre, respectively (Property File - T.D. Lewis [1978-11-01]: Report - Spruce Claim Group). Also, at this time, a vein exposed in an open-cut, at an elevation of 1034 metres, assayed 274 grams per tonne silver, 2 per cent lead and 24 per cent zinc (Property File - T.D. Lewis [1978-11-01]: Report - Spruce Claim Group).
Production from the Lucky Thought between 1914 and 1979 yielded approximately 6 tonnes of silver, 532 tonnes of lead, 701 tonnes of zinc, 350 kilograms of cadmium, 287 kilograms of copper and 584 grams of gold from 9321 tonnes mined.
The property is developed by four adits over a vertical range of approximately 152 metres. A sublevel was established off a raise between the No. 4 and No. 3 adits. No. 4 adit was driven as a crosscut 198 metres long and then follows the vein for 183 metres. No worth-while mineralization was found at this level. Most of the ore was found in a shoot above the sublevel and this had been stoped out prior to 1918.
The property was located in 1910 and development work began the following year. The Consolidated Mining & Smelting Co. Ltd. acquired the property in 1913 and continued to operate until 1918. The mine was closed until 1923, when leasee M.S. Davys reopened the workings and put in an aerial tram line to the Hewitt mill. This operation continued intermittently until 1937. In 1948, Cobalt-Yellowknife Mines examined the property. In 1950, the property was restaked by Messrs. Nesbitt and McNow of Silverton and a small shipment was made from surface workings. Two of their claims, the A.U. No. 1 and A.U. No. 2, cover the ground formerly known as the Lucky Thought. The mine lay idle until 1956, when Messrs. Nesbitt, Cordon and Nixon did some exploratory work on the lowest level. In 1976, the property was owned by S. Berisoff as the Spruce claims. An adit was proposed to access the no.1 tunnel at this time and minor production was reported during 1976 through 1979 by S. Berisoff and later Syber Mines Limited.
In 2009, Klondike Silver Corp. completed a program of prospecting, geological mapping, ground geophysical surveys and trenching on the area.
