- SMDI #
- 0799
- Current Showing Name
- Drill holes Nos. LR-105 and LR-106
- Historical Showing Names
- Drill holes Nos. LR-105 and LR-106
- Company Name
- Project Name
- UTM Easting (NAD83 Z13)
- 507433.7300
- UTM Northing (NAD83 Z13)
- 6133344.8600
- NTS Sheet
- 073P07
- TRM (Township-Range-Meridian)
- 73-19-2
- Primary Commodities
- Zinc
- Associated Commodities
- Copper, Gold, Nickel, Silver
- Discovery Type
- Outcrop Grab
- Status
- Occurrence: Primary Exploration
- Geological Details
- The showing consists of magnetite mineralization in and near quartz veins as well as 4 inch (10.2 cm) thick lenses and layers as well as pyrite, rare pyrrhotite and rare chalcopyrite mineralization in the form of stringers and veinlets cutting quartz veins and calc-silicate hornblende gneiss (calcareous metasediments).
Pyrite and pyrrhotite are associated with quartz lenses at the north end of the Jepson Lake.
Mineralization south of the Jepson Lakes area consists of disseminated pyrite, pyrrhotite, rare chalcopyrite, and locally magnetite in mafic volcanics and felsic granitic rocks. Disseminated pyrite-pyrrhotite and rare chalcopyrite are associated with shearing and quartz lenses north of the lake. The showings all occur along the southern contact with a thick band of metasediments to metavolcanics with intrusive granites.
Several trenches, located 2400 ft (731.5 m) north of Jepson Lake, expose a strong shear in a band of 320° striking, vertically dipping greywackes and interbedded hornblende schists. The shear zone is graphitic and contains pyrite and pyrrhotite, but assays indicated nothing of value. The band is in contact with a thin, 300 ft (91.4 m) wide quartzite and and granite to the south and a thick unit of felsic gneisses of metasedimentary origin to the north.
T. Sibbald mapped the area to the west and to the north of Jepsen Lakes as being covered by grey, fine- to medium-grained, well layered, locally biotite±muscovite-rich, arenaceous to argillaceous greywackes. South of Jepson Lake, the greywackes contain a northeast-trending band of intermixed calcareous metasediments and lean sulphide iron formation.
Several drill holes were completed in the area which intersected hornblendite and andesitic volcanics with lesser amounts of quartz-hornblende gneiss. Minor disseminated pyrite, pyrrhotite, and trace amounts of chalcopyrite were noted throughout the cores. Assays returned 0.01 to 0.05% Cu, 0.01 to 0.02 oz/ton Au, 0.1 to 0.27 oz/ton Ag, 0.02% Ni, and 0.01 to 0.02% Zn. The better intersections returned the following values:
DRILLHOLE INTERSECTION WIDTH PCT PCT PCT OZ PER TON ROCK
NUMBER (FT) (FT) CU ZN NI AU AG TYPE
_____________________________________________________________________________
LR-105 282.2 - 285.7 3.5 0.01 3.25 0.03 tr tr Sf in andesite
285.7 - 290.6 4.9 tr 0.49 ---- --- --- altered andesite
LR 106 83.2 - 91.0 7.8 0.01 0.18 0.02 --- --- altered andesite
97.2 - 98.8 1.6 0.06 0.17 ---- --- --- altered andesite
- Geological Domain
- Glennie
- Host Rocks
- Host Minerals
- Indicators
- Exploration History
- 7/14/1988 In 1957, excavation of seven trenches was reported on the MM 1 to 36 claims on the central western shore of Jepson Lakes by R. Myke for Green Bay Mining and Exploration Ltd.
In 1960, the Cartier Quebec Explorations Ltd. held the TOW 1 to10 claims on the west shore of the north end of Jepson Lakes, continuing further north. Four old trenches were examined and electromagnetic, magnetic and geological mapping surveys were conducted. On the ROW No. 7 claim, several trenches 2400 ft (731.5 m) north of Jepson Lakes, exposed a strong shear in rock units discussed above.
In 1965, L.G. Kelly prospected in the area, then held as CBS 21, to investigate an airborne conductor. Six trenches in the area were noted, however, only graphite and disseminated pyrite-pyrrhotite were noted. CBS 21 lapsed in 1967.
In 1969, the La Ronge Mining Ltd. conducted electromagnetic and magnetic surveys on the southwest shore of the lake, then covered by the SL2-7 and WHIST 1 to 7 claims. This was followed by the drilling of 8 holes, totalling 2711 ft (826.3 m), which intersected the rock units discussed above. In the same year, La Ronge Mining did further work between Jepson Lakes and Waden Bay on CBS 1450, CBS 1451 and CBS 1454. Ground electromagnetic and magnetic surveys were conducted and three holes were drilled on the north shore of Aikenhead Lake 2 miles (3.2 km) southwest of Jepson Lakes. Only minor sulphides were intersected and the properties were allowed to lapse in 1972, 1973 and 1976.
The area was examined and reported on in 1971 by L.H. Forsythe who examined the area for the Saskatchewan Geological Survey.
On 10 April 1981, Durama Enterprises staked the showing area as CBS 7070. In 1983, a ground EM and magnetic survey was completed on the disposition well southwest of the showing (AF 73P07-0168). Between 1984 and 1985, Durama completed limited geological mapping, prospecting and ground EM and magnetic surveys to the northwest of the showing on Sulphide Lake (AF 73P07-0188).
In 1985, SMDC optioned CBS 7070 from Durama and completed a anomaly check program of geological mapping, prospecting and rock and geochemical sampling that covered the showing area (AF 73P07-0190). No significant values were returned over the showing. In 1988, Cameco geologically mapped the Jepsen Lakes area and completed prospecting and rock and soil sampling (AF 73P07-0259). The samples were assayed for gold only. No significant values were returned.
In 1990, Durama optioned the property to Homestake Mines. They completed a reconnaissance gold exploration program of prospecting and sampling which failed to return significant values (AF 73P-0017). In 1991, Homestake completed reconnaissance prospecting of the area between Jepson Lake and and Stewart Young Bay to the northeast of the showing (AF 73P-0019). A single 0.5 m wide chip sample (number 2865) taken at grid coordinates 23+95E and 1+60S from an outcrop of hornblende-epidote calc-silicate rock, which hosts up to 1% pyrite, returned 1378 ppb Au.
- Production History
- Reserves and/or Resources