The Torrington Project lies within the Torrington Pendant, an elliptical ~30km2 outlier of Early Permian metasediments (siltstone, mudstone, sandstone and conglomerate) within the Mole Granite (Figure 1).
The majority of the Torrington Pendant lies within Torrington Minerals’ EL 8258 and EL 8355 (Figures 2 and 3). The Torrington Pendant has been intruded by the Mole Granite and contains numerous silexite bodies. The silexite forms dykes and sills within metasediments and contacts of the Mole Granite. Some silexite bodies grade into the adjacent Mole Granite and display metasomatic characteristics. In appearance the Torrington Pendant silexite is similar to white sandstone/quartzite and is massive. It contains tungsten, bismuth, gold, tin, beryl, topaz and fluorine and other minerals, and in excess of 60 mineral occurrences and deposits have been discovered within the Torrington Pendant (Figure 4). Tungsten mineralisation occurs as fine grained disseminations within the silexite, or massive loads or concentrations several tonnes in size.
Tungsten is mainly contained within the mineral ferberite, the iron rich member (FeW04) of the wolframite series.
The Mole Granite is a member of the Mole Supersuite of leucogranites of the New England Orogen and as a group are the main mineralising granites in the region. The Mole Granite in particular is well mineralised containing over 2,000 known mineral occurrences.
The Mole Granite was emplaced during a Late Permian – Early Triassic NE-NW shear couple as evidenced by a prominent series of NE trending ridges, which are easily discernible in satellite images. This structure has a strong control over mineralisation with NE and NW trending joint sets forming the pathway for hydrothermal mineralisation. Late carapace fracturing focused mineralising fluid release that led to the formation of shallowly to steeply dipping NE and NW sheeted silexite vein systems in the crown of the granite. Simple vein systems are also present and follow NW trending shears, faults and joints.