Granite Flat is located within Dart Mining’s northeast exploration region between Mitta Mitta and Glen Wills, approximately 74km southeast of Albury-Wodonga and 360km northeast of Melbourne. The Granite Flat area has a complex geological history, demonstrating great potential as a porphyry target due to the polyphase intrusion processes of the Devonian Banimboola Quartz Monzodiorite (BQM). The Granite Flat area also contains high-grade Cu-Au mineralised structures along northwest-oriented shears, making the area highly prospective for lode-style gold, as well intrusion-related precious and base metals (Ag, Cu, Pb, Zn) mineralisation.
Recent drilling completed by Dart Mining at Granite Flat intersected a number of high-grade gold lodes and has also highlighted the strong potential for bulk tonnage, porphyry or intrusion-related Cu-Au mineralisation with a number of drill holes generating long intersections of elevated Cu-Au in altered intrusive rocks.
Significant intersections from the 2020 program include:
- 19m @ 9.39 g/t Au, including 3m @ 41.1 g/t from 28m in EMPRAB28
- 4m @ 3.23 g/t Au, including 1m @ 7.84 g/t from 15m in EMPRAB29
- 9m @ 2.1 g/t Au, including 3m @ 4.98 g/t from 12m in EMPRAB32
- 20m @ 0.96 g/t Au, including 3m @ 3.46 g/t from 7m in EMPRAB03
- 25m @ 0.81 g/t Au, including 1m @ 4.89 g/t from surface in EMPRAB41 (entire hole)
- 19m @ 0.61% Cu, including 3m @ 1.52% from 28m in EMPRAB28
- 28m @ 0.35% Cu, including 9m @ 0.73% from 7m in EMPRAB03
- 45m @ 0.12% Cu, including 8m @ 0.38% from surface in EMPRAB01 (entire hole)
- 50m @ 0.12% Cu from surface in EMPRAB25 (entire hole)
Historic work has defined a 3km x 2km surface geochemical Cu-Au anomaly with elements such as silver and bismuth strongly associated with Cu-Au mineralisation. Despite the strong indications of a bulk-tonnage, intrusion-related mineralised system, no deep-detecting geophysics or drilling beyond approximately 125m vertical depth has been undertaken on the property.
Planned Reverse Circulation Drill Program
Using a track-mounted Reverse Circulation (“RC”) drill rig, Dart will undertake a 20-hole program designed to further assess the porphyry and intrusion related gold mineralization at Granite Flat. Totalling approximately 3,500m, the program will target areas of historic drilling that were not tested by the 2020 RAB drilling program and will drill deeper than historic holes, many of which ended in Au and/or Cu mineralisation. Working in tandem with the diamond drilling, the program will also follow-up encouraging significant mineralisation returned from the 2020 RAB program to further understand the potential of these results.
“Granite Flat is our company’s flagship project at present and given the very encouraging results from last year’s drill program, we have decided to ramp up exploration activity considerably. In combination with our recent Lidar survey, our current Geophysical survey, and our ongoing Diamond Drill program, the proposed ~3,500m RC drill program will accelerate the extension to the copper-gold mineralisation discovered to date”.
James Chirnside, Managing Director