The Harry Smith Gold Project was granted to Thomson Resources in 2016 and lies 30km south Ardlethan. Thomson Resources has completed Phase-1 of drilling with significant gold intercepts on all three lodes including a strong high-grade hit on the Silver Spray lode (9m at 9.2 g/t Au from 38m in HSRC009, within a broader zone of 17m at 5.2 g/t Au).
Three distinct gold-bearing quartz reefs occur at the Harry Smith prospect, 14km north of Grong Grong. Some of these reefs were previously worked under different names (e.g. Osbornes, Golden Spray, Silver Spray and Lone Hand) in three periods (1893-1902, 1911-1917 and 1937-1942). Total recorded production was over 3,500 ounces of gold. NSW Mines Report no. 2507 states that 16,000 ounces of gold were produced from these historic workings up to 1941, after being discovered in 1893.
Modern exploration was carried out by Shell Minerals including drilling of 9 percussion holes in 1981 with the next important phase of exploration was carried out by Bolnisi Gold, who drilled 15 RC holes in 1995, recording numerous mineralised intercepts. In particular the strong gold intercepts of GG95-2 (25m @2.2g/t Au) and GG95-13 (18m @ 2.4 g/t) confirmed the potential of the area at the northwest end of the Harry Smith Workings – open at depth and along strike.
Location and Geology
The Harry Smith gold prospect is situated within the central zone of the Early to Middle Paleozoic Lachlan Fold Belt, historically known as the Wagga Belt. It contains deformed Ordovician aged turbiditic sediments, intruded by Siluro-Devonian aged S-type and I-type granites, unconformably overlain by Late Devonian siliclastic continental sediments. Relief in the area is generally low, and large areas of deep soils, alluvium and a variety of Tertiary to Recent unconsolidated sediments obscure much of the Paleozoic geology across the EL.
Three distinct gold-bearing quartz reefs occur at the Harry Smith prospect – these occur in Ordovician meta-siltstones and sandstones. The mineralisation is thought to be of Intrusion-Related Gold (IRG) type and associated with the nearby Grong Grong granite. NSW Department of Mines Record reports (1894 to 1911) reported more than 16,000 ozs of gold being mined from the Harry Smith Prospect area at high grades (MR020507). Production came from a small shallow open pit at Harry Smith itself with underground workings off that, as well as from the Silver Spray workings and the deeper shafts at the Golden Spray workings.