The Prairie Creek Project is located 120 km southwest of Gladstone and 25 km southwest of Biloela, central Queensland, in the EPM 26852 tenement area. This part of Central Queensland is prospective for epithermal gold mineralisation like the Cracow epithermal gold deposit 80 km to the south.
Figure 1. Location of Prairie Creek project (EPM 26852) with prospect locations marked
The Prairie Creek prospect is the highest priority target within the project area (Figure 1 and Figure 2). The prospect was historically idfentifed from stream sediment sampling and is defined by a NE trending high grade gold in soil anomaly (0.5 – 5.0 g/t Au), extending over a strike length of 1.6 km and with a width of 200 m. The mineralisation style is interpreted as a gold-rich epithermal system containing minor silver associated with colloform quartz veining and breccia fill within a chlorite-hematite-k-feldspar-sericite altered volcaniclastic. Historic drilling has been carried out on the southern end of the soil anomaly, but the extent and continuity beyond this outcrop were not tested. Significant intersections in historic drilling included:
- 13.3 m at 2.81 g/t Au from 55.3m in DD93GW9
- 20 m at 1.18 g/t Au from 20 m in RC93GW3
- 8 m at 2.09 g/t Au from 60m in RC93GW7
- 52 m at 2.11 g/t Au from 52 m in RC93GW5, including 10 m at 3.2 g/t Au and 6 m at 6.44 g/t Au.
Duke’s initial drill program comprised three diamond holes for a total of 363.3 m. The best gold and silver intersections from all holes include:
- 4.0 m at 0.66 g/t Au from 0.0 m in PCDD001,
- 2.3 m at 4.68 g/t Au from 7.0 m in PCDD001,
- 20.4 m at 1.86 g/t Au from 11.4 m in PCDD001,
- 5.4 m at 2.95 g/t Au from 38.1 m in PCDD001,
- 7.0 m at 31.17 g/t Ag from 0.0 m in PCDD002,
- 4.0 m at 0.59 g/t Au from 0.0 m at PCDD003,
- 2.4 m at 0.71 g/t Au from 16.0 m in PCDD003,
- 1.0 m at 0.54 g/t from 37.4 m in PCDD003, and
- 2.1 m at 1.64 g/t Ag from 52.9 m in PCDD003.
Figure 2. Location of Duke Exploration diamond drill holes relative to historic drill holes and anomalous gold in soil
The three diamond drill holes from the current program intersected a succession comprising an upper volcaniclastic conglomerate/breccia dominated unit and a lower more massive unit interpreted as a Kfeldspar-hematite altered crystal tuff of the Torsdale Volcanics that are cross-cut by intrusions of mafic and syenitic composition up 10 m thick (Figure 3).
Six zones of gold mineralisation were intersected in PCDD001 and four zones of gold mineralisation in PCDD003. PCDD002 only returned low-level gold mineralisation but did return a high grade silver intersection of 7 m at 31.17 g/t Ag from surface. Gold-silver mineralisation is associated with breccia zones that have colloform banded quartz vein infill (Figure 4 and Figure 5). Breccias overprint earlier chlorite-hematite±sericite±k-feldspar alteration in the host volcaniclastics. Colloform quartz textures indicate relatively low-temperature conditions of formation and are characteristic features in low-sulphidation epithermal gold deposits such as Cracow. Late-stage quartz veins are present and cross-cut all volcaniclastic units, syenite and brecciated quartz. These results confirm epithermal style gold mineralisation is present in the top 80 m and remains open to the north, east and south.
Figure 3. Duke gold assay results on section 7279380mN in relation to interpreted geology and intersections of gold and silver from the historic drill holes
Figure 4. Brecciated volcaniclastic with colloform quartz infill associated with gold mineralisation in PCDD001 (interval 40.5 m to 43 m)
Figure 5. Close up of colloform quartz infill in PCDD001
A first pass 3D geological map will be completed in the first quarter of 2022 to progress the understanding of Prairie Creek. Following this a soil sampling programme in conjunction with detailed ground geological mapping will be planned to target the priority areas of interest, with specific focus on structural features identified in the 3D mapping project. The aim of the work will be to have several priority targets to test for feeder structures that may host significant gold grades.
For more information follow this link to the Duke Exploration IGR
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