YTC Resources Ltd (ASX:YTC) reports a detailed review of historical exploration data at the Doradilla Project has shown that a number of previous explorers discovered significant nickel sulphide mineralisation hosted in ultramafic serpentinites whilst exploring for Doradilla-type skarn tin deposits.

Review of the previous company's petrology reports indicates the nickel mineralisation presents as nickel sulphide (pentlandite) mineralisation associated with hydrothermal alteration, most likely due to the mineralising granite body at depth.

This mineralisation style is now recognised as 'Avebury' type 'nickel skarn' mineralisation, and is generally associated with large-tonnage, moderate-grade nickel sulphide deposits (for example, Avebury Nickel Deposit: 12.8Mt at 1.03pc Ni).

None of the previous explorers followed up the nickel results, due to a focus on tin.

***** Rock chip sampling and reconnaissance geological mapping has been completed over the quartz vein hosted tin-tungsten lodes at Tallebung.

This work has not only confirmed the potential for a large-scale, bulk-mineable tin-tungsten resource, but has also identified high-grade silver mineralisation for the first time.

This Tallebung mineralisation now appears to be a potential analogue to the huge silver-tin +/- tungsten +/- zinc systems of the Bolivian tin belt.

Six of 23 samples returned >20g/t silver with a maximum of 537g/t silver.

Seven of 23 samples returned >0.1pc tin with maximum of 4.8pc tin.

Five of 23 samples returned >0.1pc tungsten with a maximum of 0.5pc tungsten.

Compilation of all historic drillhole assays at Tallebung (1972) also confirmed the bulk-tonnage potential at Tallebung.

***** Meanwhile, at the Torrington Project, broad thicknesses of pyrite-pyrrhotite +/- chalcopyrite +/- chalcocite +/- cassiterite mineralisation have been logged in three of the six drillholes completed at the Planet tin mine.

Results for part of hole SD004 have been received with best results: SD004 – 25m at 0.21pc tin and 0.12pc copper from 216m.

Three of the six rock chip samples collected across the McDowells prospect returned +100g/t silver as well as strong results for tin (to 0.97pc) and bismuth (to 0.1pc). – RWE