Kin Mining NL reported highly encouraging new drilling results from its Eastern Corridor exploration program targeting the under-explored Helens East area within its 100%-owned 1.275Moz Cardinia Gold Project (CGP), located near Leonora in Western Australia. The Eastern Corridor program is aimed at enhancing the geological understanding of a number of prospects within this large mineralised complex. Mineralisation discovered to date within the Eastern Corridor extends over an area of approximately 1km by 5km on the eastern side of the CGP.
The Eastern Corridor contains a number of exciting exploration and development prospects including Cardinia Hill, Helens, Fiona and Rangoon, which collectively host in excess of 239koz of Mineral Resources and are interpreted to be structurally linked as part of a significantly larger mineralised system located on the eastern side of the CGP. Eastern Corridor Exploration Program: The Eastern Corridor targets are located between 500m and 5.0km from the centrally located CGP. Mineral Resources within the Eastern Corridor total 4.9Mt at 1.52g/t Au for 239koz across four deposits at Helens, Rangoon, Fiona and Cardinia Hill.
The area has been covered by detailed magnetics and gravity surveys and underwent Reverse Circulation and diamond drilling programs during the Company's Phase 4 and Phase 5 exploration program completed over 2020 and 2021. These drill programs revealed sulphides associated with porphyry intrusions adjacent to sheared mafic volcanic and felsic volcanic contacts as a primary control of high-grade gold mineralisation. Mineralisation is characterised by carbonate-rich alteration zones with quartz veining and pyrite mineralisation which also contains high grade silver and anomalous copper, molybdenum, antimony, tellurium, lead and zinc mineralisation.
The mineralisation is interpreted as a series of structurally controlled positions found within and along the geological contacts of strongly altered mafic and felsic rocks formed above a significant felsic intrusion. The felsic intrusion re-activates the structural positions and provides the metal-rich mineralising fluid with the precious metal precipitation by reaction with the carbonate altered mafic wall rocks. Porphyry intrusions are also a function of the underlying intrusion activity.
The structural positions can be mapped using surface outcrop, sub-surface bottom-of-hole multi-element chemistry and the detailed gravity survey completed at the project in 2020. Areas of low gravity response correspond to the positions of buried felsic intrusions below strongly altered mafic and felsic host rocks. Mineralisation sits at contacts between low and high gravity responses where structural features such as faults and structural off-sets can be identified.
The structural interpretation, mapped surface geology and detailed gravity image are shown in Figure 1 for the Eastern Corridor area. Helens East Program: RC drilling was completed in April 2022, comprising 15 RC holes for 1,620m generally at broad spacing up to 100m below and along strike from previous drilling. The program was designed to drill test the interpreted position of the Helens East Fault and intersect interpreted steep-dipping, quartz sulphide lodes below and along strike to the south of the Fiona deposit.
Also targeted were potential new structural positions away from the historical drilling locations and surface workings. The results have confirmed the extension of high-grade mineralisation at depth below and to the south of the existing 32koz Fiona Mineral Resource as well the discovery of new, steep-dipping lodes of quartz sulphide mineralisation to the east of and parallel to the Helens Lodes up to 100m below surface and extending over approximately 500m of strike length. Mineralised lodes are steep and trend parallel to the Helens lodes further to the west.
Intersections such as in HE22RC022 (7m at 24.6g/t Au from 107m) below Fiona and HE22RC030 (3m at 5.38g/t Au from 108m) and HE22RC033 (2m at 6.5g/t Au from 33m) further south demonstrate the high-grade nature of these new zones and their persistence to considerable depth. These results reinforce previous near-surface RC drilling results at the Fiona deposit such as in HE17RC099 (7m at 5.99g/t Au from 23m), HE17RC082 (15m at 3.50 g/t Au from 32m) and HE17RC026 (8m at 6.83g/t Au from 22m). In addition, zones of deeper, sulphide mineralisation have previously been intersected in broad-spaced regional RC drilling along this trend including HE20RC358 (which returned 21m at 3.58g/t Au from 45m including 5m at 4.28 g/t from 50m and 7m at 6.16 g/t from 58m).
Elsewhere in the immediate area other programs of RC drilling at Rangoon and East Lynne have been completed to test further additional mineralised positions that will potentially add further to the overall gold endowment of the Eastern Corridor. A further 30 RC holes at Rangoon and nine RC holes at East Lynne have been completed to test depth and strike extensions to previously intersected high-grade mineralisation. Assay results for this drilling are awaited.