Large Property with Significant Potential for Copper, Gold, Silver & Molybdenum
| Location: | About 235 kilometers north of Vancouver, British Columbia. |
| Area: | 7,212 ha (17,820 acres) |
| Ownership: | Cresval Capital 100% |
| Minerals: | Copper, gold, silver, molybdenum |
| Status: | Exploration |
March 22, 2006 Technical Report
Bridge River Overview
The Bridge River Project holds excellent potential for discovery of a bulk-mineable, plutonic hosted, calcalkaline porphyry copper±molybdenum±gold deposit.* The project area encompasses three copper porphyry showings: Nichol, Russnor and BR, all hosted by the 12x5 km granitic Bridge River Pluton. The widespread copper mineralization within the Bridge River Pluton, the occurrence of mineralized and hydrothermally altered intrusive breccia bodies, the presence of potassic and phyllic alteration, the presence of silica-sulphide alteration and stockwork mineralization and the location within a known porphyry belt are all favourable for the discovery of a deposit of this type. A four-phase exploration program is under consideration.The deposit model for the property is the bulk-mineable, plutonic hosted, calcalkaline porphyry copper±molybdenum± gold model. Examples of such deposits include Highland Valley Copper and Gibralter in British Columbia, and Chuquicamata, La Escondida and Quebrada Blanca in Chile.
Past Exploration
click to enlarge) Claims Map |
Most Recent Exploration
The latest program, conducted in 2005 by Cresval, involved an evaluation of the Nichol and Russnor showings. Crews collected 40 rock samples, 35 core samples, 26 soil samples and 26 stream sediment samples. This work confirmed the presence of copper, gold, silver, molybdenum and arsenic. Results are documented in Appendix II and complete results are outlined in Appendix III of the March 22 Technical Report.
Nichol Showing - High Grade Copper
click to enlarge) Bridge River valley, site of Cresval's Bridge River copper claims |
Results include but are not restricted to 4.73% Cu, 32.8 g/t Ag, 0.16 g/t Au, 0.015% Mo over 1m from Vein 1 in Trench 5, 8.91% Cu, 33.1 g/t Ag, 0.043% Mo over 0.6m from Vein 2 in Trench 9 and 2.08% Cu over 4.5m from the mineralized wallrock in Trench 1. Only 412m of diamond drilling has been undertaken on the Nichol showing in 10 holes (all less than 90m in length) yielding significant results including 3.50% Cu, 1.00 oz/t Ag, 0.079% Mo over 8.5m in 79-S1. The vein type mineralization may represent silica-sulphide mineralization in the core of the porphyry system and deeper holes are necessary to explore the bulk tonnage potential.
The Nichol showing remains open to the north, south, west and to depth.
Russnor Showing - Economic Grades
The Russnor showing contains economic grades of mineralization. The Russnor adit contains an average of 1.38% Cu over the inner 30.5m, the portal zone, 1.19% Cu over 12.2m, the cliffs south of the portal, 0.57% Cu over 60m, the cliffs 60m northeast of the portal, 1.00% Cu over 16.2m and an open cut 25m north of the portal, 0.94% Cu over 12.8m, with minor values in gold, silver and molybdenum. A maximum of only 790 metres of diamond drilling in 11 holes, with a maximum depth of 163m, has been undertaken on the showing. Significant copper values were obtained from the drill programs, commonly with anomalous copper throughout the entire hole or the entire sampled interval of core, with 0.30% Cu over 36.6m from DDH 61-5, including 0.51% Cu over 15.2m, 0.30% Cu over 26.5m from DDH 69-1 and 0.074% Cu over 69.3m, including 0.09% Cu over 48.0m from DDH 61-3. Anomalous results were obtained from unsampled intervals of the core from the 1961 drill program.
The Russnor showing is open in all directions. An open-ended, untested soil anomaly with results up to 915 ppm Cu and 47 ppm Mo extends 600m north of the adit. Anomalous stream sediment samples were obtained 200m to 400m southwest of the adit, containing from 60 to 551 ppm Cu.
Proposed Exploration
Based on the widespread copper mineralization evident within the pluton, the basalt cover rocks and lack of exposure in critical locations, a priority for the next phase of exploration will be to focus exploration within the Bridge River Pluton by completing a 150 line km helicopter supported multi-parameter (radiometric, electromagnetic and high resolution magnetic) airborne geophysical survey over the pluton and surroundings. The survey is essential to the overall understanding and evaluation of the mineralizing system and will constitute Phase 1.
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