Strong Infill And Extension Results At Brolga
De Grey Mining Limited’s (ASX: DEG) Brolga gold zone continues to add to the exciting Hemi Gold Discovery story in Western Australia’s Pilbara region.
Brolga is the largest gold zone discovered at Hemi to date. Recent drilling has targeted down dip and strike extensions to the main Brolga zone, in addition to resource infill drilling. Several diamond holes for metallurgical test work were completed earlier this year, with results for HEDD007 recently received.
Recent resource definition drilling has targeted drilling to 40m collar spacing along existing 80m spaced sections to better define thickness and grade continuity. The infill drilling program will continue over the coming months at all the Hemi zones to enable a robust resource estimate planned for mid-2021.
Intercepts received to date have been successful in demonstrating continuity of the previous wide spaced drilling (80m x 80m). Results continue to show broad zones of consistent gold mineralisation and strong correlations between adjacent holes. Infill metallurgical diamond drill hole HEDD007 demonstrated consistency of thickness and grade at 40m collar spacing and with intersections achieved in previous RC drilling. Both aspects are important for increasing confidence.
The infill programme is designed to provide sufficient drill density to enable a significant portion of the maiden resource estimate to meet JORC 2012 Indicated classification. This program will continue into early 2021 throughout the various zones in parallel with extensional drilling programs.
Several deeper diamond tails were completed to test down dip extensions to the main Brolga zone. Drilling has demonstrated that the Brolga mineralised system is open to over 600m vertical depth on section 30320E.
In addition, relatively shallow down plunge extensions to the main Brolga zone were also demonstrated by intercepts such as 86m @ 0.9g/t Aufrom 225m, which includes 31m @ 1.1g/t Au from 225m, 17.0m @ 0.9 g/t Aufrom 272m, 16m @ 1.0 g/t Au from 295m and 8m @ 2.0g/t Aufrom 350m in HERC13.
Managing Director, Glenn Jardine, said the deeper diamond drilling has served the dual purposes of testing the mineralised system at depth and providing geotechnical information in locations of potential pit walls.
The areas between Brolga and Brolga South and between Brolga and Falcon have not previously been drilled with RC. Drilling is currently testing this area for additional shallow mineralisation. Assay results for recent shallow RC holes between Brolga and Brolga South are awaited. RC drilling between Brolga and Falcon is underway. The potential for large scale, shallow open pit mining from Brolga South to Crow is demonstrated on Section 30480E.
“It is one year since the first results from Hemi were announced and the discovery has continued to deliver on its early promise,” Mr Jardine said.
The infill drilling diamond drilling at Brolga has provided strong support and confidence in the consistency and continuity of gold mineralisation previously intersected in RC drilling in this large mineralised system.
“Extensional RC drilling shows that the system remains open to the south and west. RC drilling is in progress to the south and west of Brolga between Brolga and Brolga South and between Brolga and Falcon. Potential remains to identify near surface gold mineralisation capable of shallow open pit mining.
“Extensional drilling programmes are also underway at Falcon and to the north-west of Crow in the immediate vicinity of Hemi. Results of this drilling will be communicated in the New Year.”
