SMDI #: | 1535 | Showing Name: | Laird Island Uranium Occurrences 4 and 8 | Disposition: | MC00000046 | Location: | King Lake - Laird Island | NTS Area: | 74N14 | TRM: | 124-18-3 | UTM13-Northing (NAD83/Zn13): | 6635713.74 | UTM13-Easting (NAD83/Zn13): | 271245.87 | Commodity: | U | Associated Commodities: | Hm | Type: | Trench |
Mineral Resource Assessment: | Occurrence | Mineral Deposit Type: | Beaverlodge-Type Uranium +/- Polymetallic | Geological Domain: | Zemlak | Revised On: | 2010/06/08 |
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The showing, or Laird Island Uranium Occurrences 4 and 8, are located on the channel way that links King Lake to the northwest shore of Laird Island in Tazin Lake.
The area of the showing is underlain by a northeast-trending sequence of granite and paragneiss containing thin bands of amphibolite. In 2005, K. Ashton et al re-mapped the showing area as being underlain exclusively by unit Gm or Archean coarse-grained to feldspar-porphyritic granite that, locally, contains lenticular inclusions of grey, fine- to medium-grained, homogenous to layered dioritic to amphibolitic material. This unit is unconformable overlain by gently dipping conglomerate, arkose and siltstone of the Martin Formation (mapped by Ashton as conglomeratic unit Mc) near the north end of Trench no. 4.
Occurrence No. 4 consists of a narrow, north-trending fracture zone in paragneiss. The fractures are filled with hematite and carbonate veinlets. Pitchblende is visible and coats the fracture surfaces. Trenching exposed the occurrence for 35 ft (10.7 m) and 1 ft (0.3 m) channel samples returned assays from 0.01 to 7.95% U3O8 that averaged 1.09% U3O8.
Occurrence No. 8 is a narrow fracture 3 to 6 inches wide (7.6 to 15.2 cm) wide, striking 355° and dipping 80°W. It contains hematite, chlorite and calcite with sporadic pitchblende mineralization. Trenching exposed this fracture for 65 ft (20 m) and the grade was estimated at 0.427% U3O8 across 1 ft (0.3 m) for a strike length of 36 ft (11 m).
No radioactivity was encountered in hole L-2-74 at Occurrence No. 4; however, the structural relationships in the Martin-Tazin sequence were revealed to be more complex than expected.
A small intersection of pitchblende within a zone of brecciated Tazin rock fragments was encountered in hole L-3-74, marked on the small peninsula 1 mile (1.6 km) east-northeast of occurrence 4. It is unclear whether this represents a conglomerate or a cemented fault zone. |
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The occurrences were worked by New Mylamaque Mines Ltd. From 1953 to 1964 and are located on the channelway that links King Lake to the NW shore of Laird Island in Tazin Lake. All of the Voy claims were explored by geological mapping, prospecting and trenching in 1953. Eight showings were outlined and tested by 55 diamond drill holes totalling almost 9000 feet (2743.2 m). Zones 4 and 8 were tested by 5 holes and the area surrounding showings 1 to 4 and 8 by 19 more. All drilling yielded poor results.
The occurrences were trenched and sampled and returned the values listed above.
The VOY claims became ML 5029 in 1964 and were transferred to Northgate Exploration Ltd. In 1968. In 1969, ground grid scintillometer, topographical and geological surveys were completed. R.W. Johns produced mineral distribution maps based on 487 chip samples. A broad band lying along the northwest shore of Laird Island and extending into Tazin Lake was recommended for further study.
As a result, CBS 1132 and S-88094 to S-88095 were staked by Dejour Mines Ltd. And an underwater radiometric and echo sounding depth survey was carried out by G. Goldak (as a joint venture) to test a possible fault zone offshore from ML 5029. An east-west linear anomaly was detected over the predicted course of a fault that transects Laird Island. Based on this information, drill holes L-2-74 and L-3-74 were completed to test the anomaly. No radioactivity was encountered in hole L-2-74 at Occurrence 4. Further work was recommended for this area.
In 2005, Ken Ashton et al re-mapped the showing area, at a scale to 1:50,000, for province of Saskatchewan. |
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Assessment 74N14-0006;-0007;-0034;-0041;-0043; LiteratureAshton, K.E., Card, C.D., Modeland, S (2005): Geology of the Tazin-Tsalwor Lake Area: Sask. Geol. Surv. Summ. Invest. 2005 CD ROM. Beck, L.S. (1969): Uranium Deposits of the Athabasca Region: DMR Rep. No. 126; p98-99. Koster, F. (1968): Geology of the Zin Bay Area: DMR Report No.121, p31; |
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