Airborne Survey Results

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Airborne Survey Results

Results are summarized below using annotated figures created from the original Open File 2817 colour maps and stacked profiles generated using SurView, at regional, local and property scales. A more compete series of digital images is included on CD-ROM, accompanying this report. Site-specific follow-up to these patterns should be based on larger images at improved scales.

The first three figures illustrate regional relationships between equivalent thorium and potassium (shown as eTh/K ratio in Figure 1), residual magnetic total field (Figure 2) and the calculated magnetic vertical gradient (Figure 3), with the 20 known deposits. Note that the deposits include intrusion-related Cu-Au porphyries and precious metal occurrences. All of the deposits lie within blue, low eTh/K ratio areas (Figure 1) and along the flanks of magnetic total field high areas, rather than on the highest magnetic anomalies. At many of the occurrences/deposits, these relatively low-magnetic features represent structurally controlled, magnetite destructive albitization, associated with mineralization. Weak to moderate potassic alteration is also associated with the deposits, but is not obviously evident as potassium highs on either the colour maps, or the stacked profiles.

More detailed views of the deposit signatures are illustrated by 12 stacked profile plots in Figure 4. These clearly show the consistent dip in the eTh/K ratios, along the flanks of magnetic total field highs, or sharp breaks in the magnetic profile. Neither the eTh/K values, nor the magnetic total field patterns can individually provide direct vectoring – it is the combination of the two factors that distinguishes the known deposits in the survey area. Similar features are evident in the Beaton Claims area.

Figures 5, Figure 6 and Figure 7 provide closer views of the eTh/K ratio, residual magnetic total field and calculated magnetic vertical gradient (respectively) for the Beaton-Afton area. Note that the chemical signature of the tailings, waste and altered lithologies at the surface reflect relative lows in the eTh/K ratio. Magnetic lows are best delineated on the gradient map (Figure 7), which clearly shows similar features extending through the Beaton Claim area across the survey grid.

Figures 8, Figure 9 and Figure 10 provide still closer views of the data in the Beaton Claims, showing existing grid lines (yellow), percussion and diamond drill sites (blue, green dots) and the airborne survey flight lines with fiducials (white). Again, the coincidence of the Th/K ratio low with the linear magnetic features is evident, centered at fiducial 260 on flight line 2056. Corresponding stacked profiles are illustrated in Figure 11, for each of the flight line segments over the Beaton Claims. Yellow bars in Figure 11 are positioned over possible targets suggested by the airborne trends, most evident on lines 2055, 2056 and 2057.

Based on these relationships, in 1996 the author suggested 5 possible drill targets within the Beaton Claim area, to test for mineralization, within the main eTh/K low.  At that time, platinum group elements (PGE’s) had not been noted within the known deposits.  The more recent discovery of PGE’s at Afton, and the results of the MMI survey conducted over the Beaton grid, further enhances the potential for economic discoveries. Results for Pa, Au, Ag, Cu, Ni, Co and Zn  concentrations detected by the MMI survey are indicated in Figure 12. The spatial relationship between the airborne “geochemistry” and the ground results is clear.

 

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