Intrusion Related GOLD
Mt Jacob Intrusion Related Gold
Thomson’s Mt Jacob project is on a wholly owned Exploration licence no. 8256 located 40km west of Kempsey, NSW. The Mt Jacob gold prospect is hosted by siltstones, sandstones and conglomerates of the Late Carboniferous Youdale Formation. Soil sampling has defined a large elliptical gold anomaly 1,000m by 700m and 16 shallow percussion holes drilled into the anomaly all returned significant gold anomalism.
The best intercept recorded was Hole 14 which returned 88m at 0.4 g/t Au, and like most of the other holes, it was mineralised for its entire length and stopped in mineralisation. In addition, Hole 1 returned 9m at 1.4 g/t Au from surface as well as 4.5m at 1.1 g/t Au to the end of hole at 39.6m.
Mineralisation appears to consist of quartz vein stockworks with pyrrhotite and arsenopyrite, with minor pyrite, chalcopyrite and scheelite.
The elliptical shape of the magnetic anomaly, the association with scheelite (tungsten) and minor molybdenum and the adjacent skarn suggest that the Mt Jacob area is underlain by an intrusive, probably I-type similar to the Carrai granodiorite that outcrops 15km to the northwest. It is believed that the gold mineralisation has been deposited as a carapace within the sediments above the hidden intrusive, which itself maybe mineralised, as part of an Intrusive-Related Gold (IRG) system
Warraweena Porphyry Copper - Gold
The Warraweena volcanics are a slice of magnetic volcanic arc and MORB basalts and andesites hidden beneath cover (0-300m) near Bourke, NSW. They are only known from 4 drill holes that got through the cover in this 50km long belt.
Newcrest Mining Limited (“Newcrest”) drilled three holes following up previous drilling by Mid Eastern Oil Limited in 1965 (Warraweena no. 1). Newcrest followed up intersections of copper up to 1% reported from Warraweena no. 1, but no economic intersections were obtained.