Surface trenching work at the Rio Grande project by Mansfields Minerals, Teck Corporation, and Antares Mienrals Inc. has proven to be a highly effective exploration technique. Within the area of mineralization there is only 10 to 15 percent outcrop, however the cover (soil, talus, colluvium) is often less than 2 meters deep; hence the effectiveness of shallow surface trenching.
Between 2000 and 2008, a total of 11,512.07 metres of trenching in 58 trenches (and extensions) and 5 test pits have been completed at the Rio Grande project (Figures 1 and 2; Table 1). A total of 5,046 geochemical channel samples have been collected and analyzed for Cu, Au, and Ag (Table 1). All of the significant mineralized intercepts using both a 0.2% CuT cut-off and a 0.1% CuT cut-off are reported in Tables 2 and 3.
Table 1: Rio Grande trenching summary.
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Table 2: Rio Grande significant mineralized trench intercepts (using a 0.2% CuT cut-off).
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Table 3: Rio Grande significant mineralized trench intercepts (using a 0.1% CuT cut-off).
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Figure 2: Rio Grande trench location map showing the individual mineralized zones and the location of the inset maps presented below; Discovery (purple), Sofia (green), North (dark blue), #7 (red), Southwest (yellow), and Northeast Target (light blue).
Following are detailed figures (Figures 3 to 9) and tables (Tables 4 to 10) showing the trench results for individual mineralized zones.
Discovery Zone Trenches
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Figure 3: Discovery Zone trench locations (blue) and the 0.1% CuT contour (yellow).
Table 4: Discovery Zone significant mineralized trench intercepts (0.1% CuT cut-off).
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Sofia Zone Trenches
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Figure 4: Sofia Zone trench locations (blue) and the 0.1% CuT contour (yellow).
Table 5: Sofia Zone significant mineralized trench intercepts (0.1% CuT cut-off).
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North Zone Trenches
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Figure 5: North Zone trench locations (blue) and the 0.1% CuT contour (yellow).
Table 6: North Zone significant mineralized trench intercepts (0.1% CuT cut-off).
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#7 Zone Trenches
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Figure 6: #7 Zone trench locations (blue) and the 0.1% CuT contour (yellow).
Table 7: #7 Zone significant mineralized trench intercepts (0.1% CuT cut-off).
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Southwest Zone Trenches
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Figure 7: Southwest Zone trench locations (blue) and the 0.1% CuT contour (yellow).
Table 8: Southwest Zone significant mineralized trench intercepts (0.1% CuT cut-off).
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Central Zone Trenches
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Figure 8: Central Zone trench locations (blue).
Table 9: Central Zone significant mineralized trench intercepts (0.1% CuT cut-off).
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Northeast Target Trenches
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Figure 9: Northeast Target trench locations (blue).
Table 10: Northeast Target significant mineralized trench intercepts (0.1% CuT cut-off).
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