Regional Lake Sediment Sample Geochemistry
Lake sediment geochemical surveys are particularly well suited to regions of low relief with indefinite and disorganized drainage systems. This is a characteristic of the George River area. In reconnaissance surveys, samples of organic gels (gyttja) are collected in lakes generally less than 5 km2 in area and greater than 3 m deep, with a density in the order of 1 sample per 6 to 13 km2 (Friske, 1991).
The region encompassing the Wedge Hills properties has been covered by MNRF regional scale lake sediment geochemical surveys (Beaumier, 1982, 1983, 1984, 1986). Sampling and sample preparation protocols followed the Geological Survey of Canada guidelines established for the Uranium Reconnaissance Program (1976-82). Analyses for 35 elements were achieved by a combination of instrumental neutron activation analysis and atomic absorption spectroscopy, with loss on ignition determined by gravimetric techniques. The fluorine content in water samples was determined by an ion selective electrode method, while uranium in water was determined by laser induced fluorescence. The hydrogen ion activity of water samples was determined using a glass Calomel electrode and pH meter. Rigorous QA/QC protocols involved the submission of duplicate samples, blanks and standards in each batch of 20 samples.
Data processing included normalizing the results between different laboratories computing statistics and classifying the analytical results into percentile (‰) categories. For the George River area (NTS 24A, 24G and 24H) the uranium analytical data has the following attributes:
Statistic |
24A |
24 G |
24H |
Mean(ppm) |
12.8 |
12.1 |
17.2 |
Std. Deviation (ppm) |
26.5 |
25.8 |
28.3 |
Geometric Mean (ppm) |
7.5 |
5.5 |
7.9 |
50TH Percentile (ppm) |
7.0 |
4.7 |
7.3 |
98th Percentile (ppm) |
68.0 |
84.0 |
110.0 |
Samples reporting values greater than the 98th ‰ are considered to be highly anomalous and indicative of uraniferous mineralization. This 98th ‰ was used to guide claim acquisitions.
Property Geology Geochemistry and Geophysics
The eight claim blocks forming the Wedge Hills Properties are scattered over an area measuring approximately 100 km along strike by approximately 40 km wide, and encompass a variety of bedrock lithologies. The geology, lake sediment geochemical values and magnetic signatures specific to each claim block is described in the following sections. Geology maps at the scale of 1:250,000 cover the eight properties. More detailed geology maps are not available.
Block 1
Block # 1 (See Figures 7, 8, 9) is situated in NTS 24A14 quadrangle and was acquired to cover a sample that returned 680 ppm U. Underlying geology is described as migmatite that contains large inclusions of paragneiss, meta gabbro and diabase as well as granite. A weak positive magnetic linear coincident with sample location probably reflects the presence of paragneiss and gabbro (Sigéom. 1997a, 1998a, 2002a).
Block 2
Block # 2 (See Figures 10, 11, 12) is situated in NTS 24H03 quadrangle and was acquired to cover two >98th ‰ uranium anomalies. The anomalous values are at the southeastern end of a 90 km long zone of anomalous uranium values that extends into NTS 24G (See Figure 5). Migmatite containing large inclusions of paragneiss and meta gabbro underlies the property (Sigéom. 1997c, 1998c, 2002c).
Block 3
Block # 3 (See Figures 10, 11, 12) is situated partly in NTS 24H03 and partly in 34H06 and covers two > 98th ‰ uranium anomalies. Bedrock geology is migmatite containing large inclusions of paragneiss and meta gabbro, which is reflected in the coincident north-northwest trending magnetic linears. Regional scale faults may also be highlighted by the subdued magnetic pattern (Sigéom. 1997c, 1998c, 2002c).
Figure 7 Block 1 Lake Sediment Sample Values
Figure 8 Block 1 Geology Map
Figure 9 Block 1 Magnetic Map
Figure 10 Blocks 2 and 3 Lake Sediment Sample Values
Figure 11 Blocks 2 and 3 Geology Map
Figure 12 Blocks 2 and 3 Magnetic Map
Block 4
Block # 4 (See Figures 13, 14, 15) situated in NTS 24H05 and 06 quadrangles is the largest contiguous claim block owned by Nebu and covers three > 98th ‰ uranium anomalies, as well as many other samples containing up to 81 ppm uranium, signifying a high uranium background. Bedrock is described as migmatite containing inclusions of paragneiss, felsic gneiss and granodiorite. Structural information indicates that the lithologies trend to the north-northwest. Magnetic data indicates a spatial correlation of positive magnetic features and granodiorite (Sigéom. 1997c, 1998c, 2002c).
Block 5
A single isolated > 98th ‰ uranium anomaly occurs within this claim block situated in 24H05 quadrangle (See Figure 18). Bedrock consists of migmatite with inclusions of paragneiss and granodiorite (See Figure 19). There is also a positive correlation between a weak positive magnetic feature and the occurrence of granodiorite (See Figure 20), (Sigéom. 1997c, 1998c, 2002c).
Block 6
Block # 6 (See Figures 13, 14, 15), situated in NTS 24H05 quadrangle is similar to block 5, as the claims cover a single isolated > 98th ‰ uranium anomaly. Bedrock consists of migmatite with inclusions of paragneiss and granodiorite. There is also a positive correlation between a weak positive magnetic feature and the occurrence of granodiorite (Sigéom. 1997c, 1998c, 2002c).
Block 7
Block # 7 (See Figures 16, 17, 18), situated in NTS 24G08 was acquired to cover an isolated >98th ‰ uranium anomaly underlain by granodiorite, which contains linear inclusions of biotite-quartz-feldspar paragneiss. A weak linear positive magnetic feature is spatially coincident with the sample location and probably reflects the presence of paragneiss (Sigéom. 1997b, 1998b, 2002b).
Block 8
Block # 8 (See Figures 16, 17, 18) in NTS 24 G08 represents the northwest termination of Nebu’s land holdings and also a 90 km along strike by 5 km wide zone of highly anomalous uranium lake sediment samples (Figure 5). Two > 98th ‰ uranium anomalies are covered by the claim block. The property is underlain by gneissic granodiorite intruded by granodiorite. The subdued magnetic pattern probably reflects the granodiorite bedrock (Sigéom. 1997b, 1998b, 2002b).
Figure 13 Blocks 4, 5 and 6 Lake Sediment Sample Value
Figure 14 Blocks 4, 5 and 6 Geology Map
Figure 15 Blocks 4, 5 and 6 Magnetic Map
Figure 16 Blocks 7 and 8 Lake Sediment Sample Values
Figure 17 Blocks 7 and 8 Geology Map
Figure 18 Blocks 7 and 8 Magnetic Map
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