- SMDI #
- 1447
- Current Showing Name
- Jesko Uranium Mines Uranium Showing 50-NN-31; CAR Claims Adit
- Historical Showing Names
- Jesko Uranium Mines Uranium Showing 50-NN-31; CAR Claims Adit
- Company Name
- Project Name
- UTM Easting (NAD83 Z13)
- 284175.3300
- UTM Northing (NAD83 Z13)
- 6605176.3600
- NTS Sheet
- 074N10
- TRM (Township-Range-Meridian)
- 121-17-3
- Primary Commodities
- Uranium
- Associated Commodities
- Lead, Vanadium
- Discovery Type
- Status
- Prospect: Primary Exploration
- Geological Details
- The Jesko Mine is located on the shore of Griffith Bay about 8 km(5.0 miles) north of Uranium City.
The area of the showing is underlain by Archean aged Tazin Group paragneiss and metasediments. K. Ashton et al mapped the showing area as being underlain by unit Qfm or a northeast-trending band of grey to brick red, fine- to medium-grained, variably sheared quartzofeldspathic gneisses of sedimentary origin. The majority of showings in the area occur at or near the contact of metasedimentary belts with the paragneiss along the foliation and cross-cutting fractures and breccia zones.
Uranium enrichment is not usually accompanied by an enrichment of other metals and most of the occurrences in the area are located within single isolated veins of limited width and horizontal extent.
Showing 50-NN-31 is an exception to the general characteristic of the showing type. It consists of two carbonate-chlorite infilled breccia fractures. They are about 1 ft (0.3 m) apart, strike northwest, and dip 75° to 80° northeast. The veins are 3 to 5 inches (7.6 to 12.7 cm) wide and contain minor amounts of quartz and pitchblende. The mineralized zone lies along a breccia filled cross fracture.
Work outlined a 1.75 ft wide by 50 ft (15.2 m) long ore shoot which graded 0.42% U3O8. The vein was analyzed and found to be enriched in vanadium and lead.
- Geological Domain
- Zemlak
- Host Rocks
- Host Minerals
- Indicators
- Exploration History
- 7/31/1989 Jesko Uranium Mines Ltd.'s showing 50-NN-31 is located on the north shore of Griffith Bay, on what was formerly the CAR Claims, previously covered by Goldfields Uranium Mines Ltd.'s NN Concession.
In 1952, Goldfields Uranium BAY claim No. 17 (S-9490) covered the showing. Two holes were completed on adjoining claims (AF 74N10-0441).
In early 1954, the zone was tested by 10 diamond drill holes for a total footage of 1717 ft but results were inconclusive and it was decided to explore the zone underground.
An inclined prospect shaft was sunk and 147 ft of drifting was carried out along the vein at the 50 ft level. At that horizon the radioactivity is associated with a narrow breccia zone cemented with carbonate and chlorite. A small mineralized shoot was outlined. it is 1.75 ft wide and 50 ft long.
In 1958, the property was leased to Norcan Development for high grading purposes. Exposed ore in the underground working was mined and the stockpile was sorted.
SMDC carried out detailed exploration on the property in 1979 which consist of detailed prospecting and sampling, basal till sampling, ground radiometric surveys and diamond drilling (AF 74N10-0515). As a result of this prospecting the discoveries were resampled and returned the values listed above. No further work has been reported on the showing.
- Production History
- Production Period: 1954-01-01 to 1958-12-31
407.00 tons
In 1954, an inclined prospect shaft was sunk along the vein and drifting was completed at the 50 ft level.
In 1958, Norcan Development highgraded showing 50-NN-31. Ore exposed in underground workings was mined. 407 tons of ore grading 0.15% U3O8 was extracted.
Summary:
- Uranium @ 0.15 %
- Reserves and/or Resources
- 1954-01-01
Ore shoot: 50 ft long by 1.75 ft wide which grades 0.42% U3O8.
Summary:
Historic reserve (unspecified)
- Uranium @ 0.42 %