- SMDI #
- 2387
- Current Showing Name
- SMDC Grid 12-83 U-Mo Boulder Field Showing
- Historical Showing Names
- SMDC Grid 12-83 U-Mo Boulder Field Showing
- Company Name
- Project Name
- UTM Easting (NAD83 Z13)
- 665867.7300
- UTM Northing (NAD83 Z13)
- 6443272.3400
- NTS Sheet
- 064L01
- TRM (Township-Range-Meridian)
- 105-02-2
- Primary Commodities
- Molybdenum
- Associated Commodities
- Copper, Iron, Uranium
- Discovery Type
- Float Rock
- Status
- Occurrence: Primary Exploration
- Geological Details
- The Grid 12-83 U-Mo Boulder Field Showing is located 4.5 km (2.8 miles) west northwest of the most northwesterly tip of Zangeza Bay on Reindeer Lake. The showing is approximately 6.6 km (4.1 miles) northeast of Gulf Lake.
The showing falls within the Peter Lake Domain, in a region of northeast-trending biotite and hornblende-bearing granitic rocks. The granitics tend to be medium- to coarse-grained and locally gneissic. The area covered by grid 12-83 is underlain by a southeast-trending sequence of Peter Lake Domain rocks that include fine to medium grained, massive to weakly foliated, dark grey diorite and fine to medium grained, massive to locally gneissic felsic granite. Three parallel northeast trending faults cut this sequence of rocks to the northwest of the showing.
The showing consists of a narrow band (1 to 3 m or 3.3 to 9.8 ft wide) of anomalous radioactivity that extends for 40 m (131.2 ft) across a large field of angular, frost-heaved boulders. The boulders that constitute this showing are composed of the same felsic granite that underlies the grid. Both ends of the radioactive zone are drift covered. The anomalous radioactivity, which seems to increase as the molybdenum content increases, returned scintillometer readings of up to 10,000 cps. The mineralization present in the boulders includes pyrite, pyrrhotite, molybdenite, magnetite, and minor chalcopyrite within and along the margins of epidote grains. No visible uranium mineralization was noted. Grab and chip samples taken from the mineralized boulders returned the following values:
SAMPLE PPM PPM PPM PPM PPM PPM PPM PPM
NUMBER CU U AU AS NI PB ZN MO
______________________________________________________
104 --- 508 --- --- --- --- --- 3312
111 39 417 --- 0.5 --- 124 30 1288
113 59 102 --- 0.1 --- 873 36 4788
114 --- 255 --- --- --- --- --- 3370
115 48 979 --- 0.7 --- 146 34 3117
117 51 60 --- --- --- 56 66 4291
118 --- 117 --- --- --- --- --- 1916
119 115 177 --- 0.2 --- 180 139 2274
701 99 529 0.01 0.4 15 219 155 7290
702 14 13 0.01 --- 11 88 41 1940
703 76 355 0.01 0.1 15 148 174 3901
704 90 117 0.01 0.1 16 4 99 1880
- Geological Domain
- Peter Lake
- Host Rocks
- Host Minerals
- Magnetite, Molybdenite
- Indicators
- Exploration History
- 4/3/1992 Earliest records of ownership indicate that Francana Oil and Gas Ltd. staked the area as Permit No. 1 sometime prior to November 1969. That same year, airborne EM, radiometric, and magnetic surveys as well as a photogeological uranium study were conducted across the region (AF 64L01-0003). The permit was allowed to lapse by December 1970.
The area was not restaked until May 1974 when it became CR 619. The following year, a ground evaluation of airborne EM anomalies detected by the 1973 to 1974 Skyvan survey was performed (AF 64L-0018).
In March 1976, Crown Reserve 619 was replaced by SMDC Permit No. 10. That same year airborne geophysics, hound-dogging, and ground evaluation of anomalies were carried out (AF 64L-0008). These were followed in 1977 by regional lake sediment sampling and hound dogging, as well as detailed geological surveys and overburden sampling across seven grids (AF 64L-0012). This work discovered the U-Mo mineralized boulder field on grid 12-83 that comprises this showing.
In June of 1979, SMDC Permit No. 10 was renamed MPP 1072. SMDC completed geological mapping, break-in-slope sampling, and ground VLF-EM and magnetic surveys on grid 12-83 (AF 64L01-0007). A ground IP survey was also completed over the grid (AF 64L01-0006). In this year, G. Ray geologically mapped NTS 64L. The area of grid 12-83 was not covered by this mapping program. On 1 August 1983, MPP 1072 was allowed to lapse.
In 1988, D. MacDougall completed a metallogenic map of NTS 64L. The showing is not included in this report.
- Production History
- Reserves and/or Resources