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Marymia 3D modelling

Dampier Gold is the dominant land holder over the prolific but under-explored Plutonic – Marymia Greenstone Belt in central Western Australia. Dampier Gold is actively evaluating and exploring its 100%-owned, 412km2 tenement holding over a highly prospective Archaean greenstone belt in central Western Australia.

Dampier's Project includes five advanced projects hosting a total JORC Mineral Resource of 5.5 Million tonnes at 3.8g/t Au for 683,000 contained ounces of gold. Excellent potential exists for resource expansion and near surface discoveries including concealed large-scale deposits located in underexplored highly prospective mineralised corridors.

 

Dampier engaged Kenex to deliver a regional 3D prospectivity model, with the specific aim of understanding the 3D geology of the region, understanding 3D controls on gold mineralization and statistically assessing the prospectivity of the region at depth to allow the objective prioritisation of exploration of the region in the future. The model was designed to integrate all available technical information and develop quantitative estimates of prospectivity in three dimensions. The project results indicate that there is excellent exploration potential along untested portions of the greenstone belt for the discovery of concealed multi-million ounce deposits.

 

Oblique view of entire Plutonic – Marymia Greenstone belt showing major deposit locations, four priority targets plus numerous other locations of high prospectivity (magenta) (turquoise = granite mafic thrust contacts; brown = mafic/ultramafic – meta-sediment contacts.)

 

Regional 3D Prospectivity Model

Kenex, working in close association with Dampier Gold technical staff, delivered a 3D prospectivity model ("Model") covering the entire Plutonic-Marymia greenstone belt. The Model integrated all available geophysical, geological and geochemical information to assess prospectivity in three dimensions to a depth of 2.2km. The Model predicts where the highest concentrations and/or intensity of known controls of mineralisation are located in 3D throughout the entire greenstone belt, which will allow Dampier to focus on specific zones resulting in improved targeted exploration.

 

Four high priority target zones, out of more than 30 identified, namely: Apache Rose, Fridge Ridge, Doshem and Prickleys West have been selected by Dampier for immediate detailed analysis. The high priority target zones are all located at favourable geological positions with potential to host large gold rich mineralised systems.

 

Apache Rose Target

The largest identified target zone is Apache Rose, which in plan has dimensions of approximately 1,800m x 900m and extends vertically to at least 1,000m depth. Apache Rose exhibits the following attributes making it a high priority target zone:


  • Favorable geology for hosting significant mineralised systems comprising multiple stacked shear zone lodes similar to Plutonic or Trident;
  • Proximity to two major thrust structures, including the granite overthrust;
  • Important east-west intersecting structures detected by geophysics;
  • Gold in soil geochemical anomaly at surface;
  • No drilling within the 1,800m strike length of the target;
  • Potential for near surface mineralisation.
 

Fridge Ridge Target

The Fridge Ridge target zone has plan dimensions of approximately 900m x 250m and a vertical extent of about 800m. Shallow RAB drilling by previous explorers (maximum depth of 50m) at the eastern end of the target zone intersected narrow uneconomic gold mineralisation which it is now thought may indicate the peripheral extent of a significant mineralized system at depth, similar to the undeveloped Trident deposit, located in an equivalent geological position. Fridge Ridge exhibits the following attributes making it a high priority for further detailed evaluation prior to drill testing:


  • Favourable host rocks for significant mineralised systems comprising multiple stacked shear zone lodes similar to Plutonic or Trident;
  • Proximity to two major thrust structures including the granite overthrust;
  • Important east-west intersecting structures detected by geophysics;
  •  Sub-economic shallow mineralisation intersected in RAB drilling analogous to the Trident

Zoomed in oblique view showing the Apache Rose and Fridge Ridge priority targets (Red) located between two major thrust structures in mafic and ultramafic rocks (translucent turquoise and brown).

 

Doshem Target

 The Doshem target zone has plan dimensions of approximately 900m x 300m and a depth extent of more than 500m. It is also located adjacent to the same major structure interpreted as one of the key controls of the Cinnamon deposit. The following attributes highlight Doshem as a high priority target zone for further detailed evaluation, prior to drill testing:


  • Favourable lithologies for hosting significant mineralised systems, similar to the quartz stockwork style at the nearby Cinnamon deposit;

  • Proximity to an important major structure detected by geophysics;

  • Multi-element geochemical anomaly located over the target;

  • No previous drilling within 900m of the target zone;

  • Potential for significant near surface mineralisation.

Zoomed in oblique view showing the Doshem priority target (red) located adjacent to the major structure (translucent blue) interpreted to be one of the key controls of the Cinnamon deposit

 

Prickleys West

The Prickleys West target zone has a surface expression of approximately 850m x 500m and extends to a depth of more than 700m. It is located adjacent to and projects below the same interpreted granite overthrust that hosts the Trident deposit, located to the south-west. Prickleys West exhibits the following attributes:


  • Favourable lithologies for hosting significant quartz vein mineralised systems, similar to the nearby K2 deposit;

  • A major east-west structure detected in geophysics intersects the granite overthrust at Prickleys West;

  • Drilling has intersected near surface mineralisation that may indicate a larger mineralised system at depth, comparable to the Trident deposit;

  • Large untested areas with potential to host plunging high grade shoots.

Zoomed in oblique view showing the Prickleys West priority target (red) located adjacent to and extending below the granite over-thrust structure (translucent turquoise)

 

At the completion of the model, aside from the development of drill targets, the understanding of the geology in 3D, was enhanced and some of the limitations were better understood. The controls on gold mineralisation that could be used to statistically assess the prospectivity of the region at depth was established, allowing on-going exploration to be more efficiently targeted. Any additional exploration can also be used to test and finesse the geological and structural surfaces, adding to the understanding of the region at every stage.

 


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