- SMDI #
- 2068
- Current Showing Name
- Trench OHT-1 (U-Pb)
- Historical Showing Names
- Trench OHT-1 (U-Pb)
- Company Name
- Project Name
- UTM Easting (NAD83 Z13)
- 246183.6400
- UTM Northing (NAD83 Z13)
- 6488239.4700
- NTS Sheet
- 074K06
- TRM (Township-Range-Meridian)
- 109-21-3
- Primary Commodities
- Uranium
- Associated Commodities
- Lead, Thorium
- Discovery Type
- Trench
- Status
- Occurrence: Primary Exploration
- Geological Details
- The showing is the result of a trench (OHT-1) which returned anomalously high scintillometer values.
The area containing the trench was mapped by C.T. Harper in 1976-78 as consisting of a granodiorite complex, generally pinkish grey to red, well-foliated, and fine to coarse-grained. Locally the complex grades to a diorite gneiss which appears dark grey, is coarse-grained and foliated. The trench area is cut by a major fault.
More detailed mapping by Amok Ltd. identified the geology of trench OHT-1, which comprises the showing, as consisting of reddish brown, hematized sandstone overburden overlying a number of varieties of bedrock generally consisting of quartzitic gneiss. Also within the trench, a very altered, brecciated and soft rock was noted as well as a very hematized, dark reddish brown, altered rock with visible hematite.
The radioactivity within the trench is associated with a highly hematized, altered basement rock which appears to be garnet-rich. The radioactive area is associated with a fault zone, identified within the trench as a highly altered and fractured zone. A maximum radioactivity of 15,000 cps was returned from the trench, and subsequent geochemical analysis returned 59 ppm U, 355 ppm Pb and 275 ppm Th. It was not evident whether the uranium and thorium were present within the crystalline rock or as interstitial grains. Radon gas measurements from the trench were also anomalous.
- Geological Domain
- Beaverlodge
- Host Rocks
- Host Minerals
- Indicators
- Exploration History
- 8/2/1989 The earliest records of exploration available to the author indicate that the area was first staked as CBS 2351 on 3 September 1968. Detailed exploration began the following year with a general program of mapping and interpretation with cross-sections, an airborne radiometric survey with anomalies mapping, and emanometer survey with mapping, a ground magnetic survey, and geological and geochemical surveys with maps (AF 74K05-0007).
Work continued the following two years with another general program of geological, ground radiometric and geochemical surveys (AF 74K06-0013). More work was recommended as follow-up to this general studies and in 1972 a program of diamond drilling, radiometric and geological surveys, seismic and gravity surveys and geochemical sampling was undertaken (AF 74K06-0020).
CBS 3380 was staked within CBS 2351 sometime soon after that. A program of strategic geochemistry was done in 1975 and in 1976 followed up by detailed geochemistry. Overburden drilling and sampling as well as geological and radiometric prospecting and trenching was done in 1977 in order to follow up the geochemical anomalies located from the previous surveys. The program was generally unsuccessful except in the trenched area, which was located to find the source of radioactivity noted in overburden. Trench OHT-1 was dug and the scintillometric values returned. An overburden drill hole (no. 1043) located approximately 50 m northeast of the trench was the only drill hole to return anomalous radioactivity (AF 74K06-0068). More study was recommended for the trench area in order to check for the presence of uranium in larger amounts and to explain the origin of the thorium and uranium.
In 1978, the area became part of ML 5284. In 1979, Amok did diamond drilling as well as overburden drilling and sampling in the area but no favourable results were returned. The following year reconnaissance mapping, a spectrometer survey, radon survey, ground ground magnetic survey, detailed prospecting, geochemical sampling, trenching, overburden sampling and drill core sampling were done (AF 74K06-0081) in the area but again no encouraging results were returned. The area was maintained by work done on other parts of the mineral lease until 1 July 1987 when it was allowed to lapse. The area remains open.
- Production History
- Reserves and/or Resources