Thomson Resources (ASX: TMZ) has identified multiple untested chargeability anomalies from a recently geophysical survey at the Texas silver-base metals project in southern Queensland.
A large-scale 37.8 line-kilometre dipole dipole induced polarisation (DDIP) survey defined seven anomaly clusters with similar geophysical responses and in similar geological settings to the existing Silver Spur and Twin Hills deposits.
Field checking of the DDIP lines confirmed windows of previously-unsampled Twin Hills-like silicified, veined and iron oxide-stained sediments which support the potential for mineralisation associated with some of the anomalies.
Drill targeting using DDIP data, historic data sets and Thomson’s knowledge of the local geology is in progress to prioritise initial spots in and adjacent to the historic high-grade Silver Spur mine.
Exploration specialist and Thomson shareholder Australian Mineral and Water Drilling has been contracted for drill testing of selected targets next month, using a multi-purpose reverse circulation and diamond core rig.
The DDIP program is an initial step in a new district-scale systematic exploration program being carried out by Thomson at the large and underexplored Texas project.
The area hosts a range of deposit styles including silver-dominant discoveries such as Twin Hills, silver and base metal-bearing deposits like Mt Gunyan, silver-zinc deposits like Silver Spur and copper-rich deposits like the Hornet prospect which returned historic drill intersections of up to 10 metres at 1.27% copper and 2m at 4.9% copper from 154m.
Analysis of the sulphide, alteration assemblages and metal ratios present in all these deposits suggest they formed over a range of crustal depths from shallower epithermal through to deeper level epizonal levels.
Thomson said they are best explained as manifestations of a district-scale mineralising event which has been exposed by erosion at different levels in the mineral system.
The survey results support the view that the district is prospective for the discovery of near-surface bulk mineable sediment-hosted epithermal silver (gold) mineralisation (similar to Twin Hills) and high-grade structurally-controlled silver-zinc (copper, lead, gold) deposits (like Silver Spur).
Thomson executive chairman David Williams said drilling would confirm the similarities between the anomalies and existing deposits.
“The geophysical survey has produced some very exciting and outstanding results and it is now a matter of waiting to see what the drilling actually produces,” he said.
“The possible correlation to Twin Hills and Silver Spur makes these anomalies compelling and high-priority targets.”