お知らせ • Jun 24
First Au Limited Announces Update to Previously Reports Jorc Inferred Resource from Gimlet Gold Project Near Kalgoorlie in Western Australia
First Au Limited announced an update to its previously reported JORC Inferred Resource from the company's Gimlet Gold Project near Kalgoorlie in Western Australia. The new Mineral Resource Estimate (MRE) has resulted in an inferred resource of 1,166,000 tonnes at 3.2 g/t Au for 120,000 ounces at a 1 g/t cut-off. This is a 73% increase from the previous reported inferred Gimlet Resource of 69,000 ounces Au at 3.3g/t and cut off of 1.3g/t Au. The mineralisation at Gimlet remains open at depth. First AU's 100% owned Gimlet Project occurs 15 km NW of Kalgoorlie, Western Australia, and tenements (E26/174 and MA 26/849) occupy 9.6 km2 in area. It is close to existing infrastructure and within trucking distance of five gold mills within the Kalgoorlie area, with several offering the toll treatment of ore to third parties. The geology in the tenement is prospective for gold, dominated by metamorphosed felsic and intermediate volcanic rocks of the Black Flag Group of the Kalgoorlie Terrane, Yilgarn Craton. This Archean geology is overlain by Cainozoic sediments, including some areas covered with salt lakes, which has previously inhibited the effectiveness of some of the historic exploration. First Au has completed multiple aircore and RC programs, which returned strong intersections, including 3m at 462 g/t Au from 52m. Mineralisation is interpreted to be related to an NNW-SSE near vertical structure observed in the magnetic imagery and the geological logging of the drilling. This structure appears to persist south of the Gimlet tenement, into the Horizon Resources tenements, following a trend containing the Teal Deposits including Teal, Jacques Find and Peyes Farm which total 288,000 oz Au. These Resources appear along a series of structures ~2.7km in strike and would suggest a significant mineralising system is evident. Mineralisation is interpreted to be associated with the Abattoir Shear, a regional structure and gold carrying conduit. Mineralisation at Gimlet occurs as: 1) a supergene blanket within the saprolite clays; 2) a supergene-enriched shear zone, at the fresh rock /oxide interface in the transition zone; and 3) sheared felsic to intermediate volcanic and volcanic-derived sedimentary fresh rock, containing lenses, disseminated and stringer sulphides, with quartz vein material. Pyrite appears to be the dominant sulphide phase, while arsenopyrite, sphalerite and galena have also been identified in the logging. In several cases, the mineralised structures are bifurcated and can appear as several lodes. The fresh mineralised zone often shows a broader halo of disseminated pyrite (with associated sericite-carbonates-quartz), containing lower grade mineralisation (~ 10 - 500 ppb Au). First Au has drilled multiple programs since mineralisation was first discovered from aircore drilling, announced on the 8 November 2018. The RC and diamond drilling is generally spaced to 40 metres along the already identified ~ NNW-SSE mineralising trend and covered mineralization from ~ 30m to below 300 m vertical depth, and ~ 450m in strike length. A total of 63 RC drill holes, and 8 diamond drill holes were used to create a 3D mineralisation framework and weathering surface. Majority of the drilling was angled and drilled in an easterly direction. Earlier aircore drilling by FAU was also used when coverage by RC was not available. First AU has a history of significant gold intersections at Gimlet and is summarised below - Significant intersects from the November 2018 drilling included: Drillhole 18GRC016 13m @ 8.2 g/t Au from; Drillhole 18GRC017 31m @ 2.1 g/t Au from 48m; Drillhole 18GRC002 15m @ 3.4 g/t Au from 64m; Drillhole 18GRC007 21m @ 2.5 g/t Au from 138m; Drillhole 18GRC006 9m @ 3.5 g/t Au from 43m; Drillhole 18GRC019 5m @ 7.8 g/t Au from 63m. Significant intersects from the RC and diamond drilling RC drilling in March 2019 drilling included: Drillhole 19GRC013 15m @ 7.2 g/t Au from 93m; Drillhole 19GRC015 26m @ 3.1 g/t Au from 90m (including 1m @ 19.1 g/t Au from 94m); Drillhole 18GRC022 4m @ 18.8 g/t Au from 38m (including 1m @ 71.2 g/t Au from 38 m); Drillhole 19GRC025 11m @ 4.0 g/t Au from 99m; Drillhole 19GRC030 15m @ 6.6 g/t Au from 157m (including 2m @ 31.4 g/t Au from 169 m); Drillhole 19GDD001 32m @ 4.9 g/t Au from 93m (including 1m @ 40.3 g/t Au from 122 m); Drillhole 19GDD002 23m @ 1.7 g/t Au from 83m. Significant intersects from the diamond drilling in October 2019 and RC drilling in January 2020 drilling included: Drillhole 19GDD001 12m @ 4.0 g/t Au from 223m (including 1m @ 28.7 g/t Au from 228 m); Drillhole 20GRC002 10m @ 3.1 g/t Au from 195m; Drillhole 20GRC004 1m @ 3.1 g/t Au from 127m and 5m @ 3.6 g/t Au from 150 m. Significant intersects from the diamond drilling in August 2020 drilling included: Drillhole 20GDD001 30m @ 0.9 g/t Au from 223m; Drillhole 20GDD002 33.3m @ 1.6 g/t Au from 291m; Drillhole 20GDD003 3.1m @ 2.4 g/t Au from 125.6m and 1m @ 3.7 g/t Au from 147 m. Significant intersects from the RC and diamond drilling in November and December 2020 drilling included: Drillhole 20GRC013 17m @ 3.7 g/t Au from 170m; Drillhole 20GRC012 9m @ 4.8 g/t Au from 145m (including 3m @ 4.8 g/t Au from 145 m); Drillhole 20GRC014 4m @ 3.6 g/t Au from 54m; Drillhole 20GRC015 20m @ 3.7 g/t Au from 46m (including 1m @ 30.6 g/t Au from 81 m). The interpretation was then used to flag drilling data to be used in estimation of grades for a block model constructed using the Geovia Surpac software package (Surpac). The mineralization interpretation was completed on 40 metre (m) spaced drilling, based on a 0.5 grams per tonne gold (g/t Au) lower cut-off to define mineralisation. The resource was classified as Inferred on the basis of drill density, geological understanding, grade continuity and the assumption that areas less than 100 metres below surface can potentially be mined in an open pit using a cut-off above 1 g/t and areas deeper than 100m with continuous grade above 2g/t can potentially be mined from underground. The June 2021 MRE contains 1,165,900 tonnes at 3.2 g/t Au for 120 thousand ounces above a 1 g/t cut-off. Additional information is provided below in the main body of the announcement. Further optimisation work will be undertaken to look at the economics of the Gimlet Project. To increase the mineralised footprint at Gimlet, the next phase of exploration planned involves aircore drilling of new structural targets identified during 2020 litho-structural analysis by FAU geologists. These areas identified, have had limited previous drilling. This includes areas along strike of the Honeyeater and Kestrel Prospect areas, which occur within Horizon Minerals' Binduli Gold Project, which recently completed a successful drill program.