Thomson Fold Belt

Thomson Resources has identified an area of Cobar-type rocks in the southern part of the Thomson Fold Belt.  To date, seven “Bulls-eye” magnetic anomalies have been drilled across this 100km x 25km area, all with encouraging results (CUT A, Ac, B, F3, F14, F16, F17) including at Cut A and B high grade intercepts; demonstrating for the first time that these systems have the potential to host economic deposits. The high grades were in a range of commodities in different combinations: up to 4.2% zinc, 113 g/t silver, 2.5 g/t gold, 0.5% copper, 1.8% lead, 0.8% tin and 0.6% tungsten.

  • Basement lithologies intersected appear to be equivalent to the Cobar Basin sediments that host major ore deposits near Cobar (see Cobar-type deposit model).
  • Rocks in drill core at all five of the anomalies (at Cuttaburra B, F3, F14, F16 and F17) display similar alteration patterns (that is, chlorite and sericite alteration and silicification), disseminated to vein pyrrhotite and crackle vein development similar to that seen near the Cobar deposits.
  • Magnetic logging of the core at all the prospects has shown that pyrrhotite is the dominant sulphide and the only magnetic material intersected, yet none of the holes intersected sufficient pyrrhotite to account for the surface magnetic anomalies. This indicates that substantial volumes of pyrrhotite are likely to exist at these prospects, but are as yet untested by drilling.
  • Drilling intersected up to 4.2% zinc, 113 g/t silver, 2.5 g/t gold, 0.5% copper, 1.8% lead, 0.8% tin and 0.6% tungsten signifying that metalliferous, hydrothermal systems of the type needed to generate ore deposits have been operative in the area.
  • All holes have confirmed that the prospective basement is at a reasonable depth (80 - 280 metres) for exploration.
  • There are numerous other magnetic anomalies within the tenements that have not been fully assessed and provide opportunity for future exploration.
Typical “Bulls-eye” magnetic anomalies   


                       Cuttaburra B (1km squares)                             F16 (1km squares)