Extensional drilling continues to extend the already sizeable Brolga mineralised system at De Grey’s play-opening Hemi Gold Discovery in WA.

Notably, a thick intersection of 256m grading 0.9 grams per tonne (g/t) gold from a depth of 287m that ended in mineralisation and includes higher grade zones such as 9m at 3.1g/t gold from 497m has demonstrated the interpreted plunge in this area of Brolga that remains open to the southwest.

De Grey Mining (ASX:DEG) also intersected strong extensions in the northwest of Brolga with results such as 57m at 1.5g/t gold from 91m including 10m at 6.4g/t gold from 138m.

This has the potential to further extend Brolga mineralisation due to the limited drilling along strike and updip of this intersection.

The company added that anomalous gold observed in aircore drilling between the Brolga and Falcon zones will require follow-up reverse circulation drilling.

While multiple zones of gold mineralisation such as Falcon and Eagle have been discovered at Hemi, Brolga remains the largest zone discovered to date.

de grey
Drill section showing Brolga plunge potential. Pic: Supplied

“Recent extensional RC and diamond drilling has been successful in identifying wide zones of mineralisation along in the west of the large Brolga mineralised system and remains open to the south, west and at depth,” managing director Glenn Jardine noted.

“Higher grade intervals within the larger mineralised system have also been intersected.

“RC drilling is in progress to extend mineralisation further between Brolga and Brolga South and between Brolga and Falcon.”

Infill drilling

De Grey’s infill drilling program has also been successful in demonstrating broad zones of consistent gold mineralisation between previous wide spaced drilling.

Notable results are:

  • 40m at 1.4g/t gold from 57m including 10m at 4.8g/t gold from 57m;
  • 40m at 1.5g/t gold from 168m including 10m at 5.3g/t gold from 183m;
  • 116m at 0.8g/t gold from 144m including 25m at 1.8g/t gold from 235m; and
  • 30m at 1.5g/t gold from 95m including 16m at 2.8g/t gold from 109m.

“Results of infill drilling continue to show broad zones of consistent gold mineralisation and strong correlations between adjacent drill holes,” Jardine added.

“The infill program is designed to provide sufficient drill density to enable a significant portion of the maiden resource estimate to meet JORC 2012 Indicated classification.”


This article was developed in collaboration with De Grey Mining, a Stockhead advertiser at the time of publishing.


This article does not constitute financial product advice. You should consider obtaining independent advice before making any financial decisions.