The Bundarra Project that includes the Bundarra tenement (EPM 26499), Duania tenement (EPMA 27474) and Waitara tenement (EPMA 27609) are located approximately 130 km southwest of Mackay and 50 km east of Moranbah, in the Central Queensland coal fields.
The Bundarra project occurs in the Lower Permian to Triassic Bowen Basin, west of South Connors Arch. Copper mineralisation in the Flora and Kerlong Ranges occurs on and around the margins of the Bundarra Pluton, an Early Cretaceous composite pluton that intrudes Lower Permian Back Creek Group carbonaceous shale, sandstone and marl. The pluton crops out poorly, forming an area of low relief surrounded by a ring of hills of contact metamorphosed sediments.
Historic small-scale mining activities started in in the late 1800s targeted copper, silver and gold veins around the contact of the Bundarra Pluton. Historic drilling results confirm that the metamorphic contact zone around the pluton to be associated with significant copper mineralisation at the Mt Flora mine, Isens mine, Rogers prospect and Quorn prospect, respectively. Historic data from these mines and prospects were used in the Independent Geological Report (IGR) for the prospectus to define an Exploration Target, which is detailed in the Independent Geological Report Pg28 Table 2.
More recently Duke Exploration has successfully drilled three diamond holes into the flagship prospect Mt Flora, intersecting multiple stacked veins of massive chalcopyrite that have widths from 20 cm up to 2.5 m. The assay results for the drill holes DFD001, DFD002 and DFD003 include the highest grade massive sulphide vein assays returned from any historic drilling in the project area, including:
- 16.95% Cu, 287 g/t Ag and 0.31 g/t Au in DFD001, and
- 10.45% Cu, 191 g/t Ag and 0.27 g/t Au in DFD002.
Conductivity was measured in two of the three new diamond holes with a downhole probe. The downhole data confirmed that copper mineralisation is statistically correlated with increasing conductivity values.
With this information, Duke remodelled historic 2D IP data, followed by running a 3D IP survey and Fixed loop EM survey over Mt Flora in 2020. The result of the surveys successfully mapped the known historic mineralisation and mapped several new anomalies that are much larger to the north.
To date 103 prospects have been identified around the Bundarra pluton, with five high priority areas ready for drill testing. The ability to directly detect the massive sulphides that host the copper, silver and gold in the Bundarra mineral system using ground EM and 3DIP geophysics will not only speed up the exploration process and significantly reduce costs but also add value to the project more quickly than would happen in projects that require drilling to establish project valuations. Importantly, the results from the 3D IP survey at Mt Flora are a significant step forward in the exploration and development of a successful mining operation at Bundarra.
For more information follow this link to the Duke Exploration IGR (PDF download)