Special Report: Expansion of De Grey’s Brolga zone is taking it closer to the Aquila and Scooby zones as drilling continues to intersect gold hits.

Step-out drilling at Brolga – part of a broader campaign being conducted in all directions around the Hemi discovery in WA’s Pilbara region – has intersected shallow mineralisation about 320m to the east.

De Grey Mining (ASX:DEG) notes that this mineralisation is located along the structural trend towards a known mineralised zone at Scooby, which is a further 1km to the northeast.

Significant results include 17m grading 1.4 grams per tonne (g/t) gold from a depth of 64m and 4m at 3.3g/t gold from 44m.

Meanwhile, reverse circulation drilling testing for extensions to Brolga mineralisation has hit gold to the north, northeast and southwest.

Where it gets particularly interesting are the hits of 40m at 2g/t gold from 36m, 30m at 1.6g/t gold from 101m and 5m at 2.8g/t gold from 142m in the same hole and 7m at 3.9g/t gold that take Brolga mineralisation closer to the Aquila zone.

Drilling location plan showing the new strike extension to the northeast of Brolga Pic: Supplied


Specific diamond drilling to provide samples for metallurgical variability and optimisation testwork has also returned top hits of 62m at 2.2g/t gold from 47m, 23.2m at 2.8g/t gold from 139.9m and 36m at 1.2g/t gold from 74m.

Managing director Glenn Jardine says that assays from metallurgical drilling will provide additional information on the internal continuity of the gold mineralisation within Brolga.


Extensive drilling campaign unlocking Hemi potential

De Grey currently has two aircore rigs testing for new intrusions or extensions to known mineralisation and two reverse circulation rigs to follow-up on positive aircore results and providing pre-collars for diamond drilling.

It also has two diamond drill rigs testing for depth extensions and which have recently completed holes for metallurgical testwork.

“The rig combination at Hemi is allowing us to locate near surface extensions with aircore drilling, delineate and extend known mineralisation with RC and then look for depth extensions with the diamond rigs,” Jardine said.

Hemi currently has an overall footprint of about 2.5km north to south and 2km west to east with three main zones – Aquila, Brolga and Crow – defined to date.

recent airborne magnetic survey has also identified four new clusters, with at least 16 individual new intrusive targets within the Greater Hemi corridor.




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.