De Grey Mining extends the Falcon intrusion at Hemi

by Leena Thomas
Image: De Grey Mining Limited

De Grey Mining Limited (ASX: DEG) has announced that the aircore drilling at Hemi Gold Discovery has extended the Falcon intrusion a further 640m to the south for an overall strike of 2.4km and remains open to the south.

The company reported that the new RC and diamond drill results over the northern most 320m strike continues to confirm broad gold mineralisation down to 250m depth and remains open at depth.

Significant hits include 92m @ 1.3g/t Au from 167m; 66m @ 1.1g/t Au from 114m; and 51m @ 1.5g/t Au from 205m.

DEG said that the aircore drilling will progressively move to the south to test for strike extensions. The company said that RC and diamond drilling would test for extensions at depth.

Mallina gold project

De Grey’s Mallina Gold Project is located approx. 60km south of Port Hedland in the Mallina Province of Western Australia.

The project hosts numerous large deposits, of which significant gold deposits include Withnell, Mallina, and Toweranna. Other prospects include Hemi, Antwerp, and Scooby. Hemi is surrounded by world-class infrastructure within a Tier 1 mining jurisdiction.

Hemi is a discovery under 30m of transported cover, with two zones of strong, broad sulphide rich alteration with high-grade gold mineralisation partially defined in the Aquila and Brolga zones. De Grey had recently defined a third gold in bedrock zone called the Crow zone located immediately adjacent and north of the Aquila zone.

DEG’s recent drilling west of Brolga and south of Aquila had delineated a highly brecciated and extensively sulphide altered subvertical intrusion. This new intrusion has been named Falcon.

Drilling at Falcon

The company had recently commenced drilling at Falcon. Previously reported significant RC drilling results included 58m @ 2.1g/t Au from 64m in HERC232 (section 7691640N); 11m @ 1.2g/t Au from 199m in HERC231 (section 7691640N); 31m @ 1.3g/t Au from 88m in HERC234 (section 7691800N); and 16m @ 3.7g/t Au from 43m in HERC141.

Drilling extends Flacon intrusion

The company reported that the aircore drilling has extended the Falcon intrusion to 2.4km in strike and it remains open to the south. The intrusion is up to 80m wide and remains open at depth. DEG said that the bedrock mineralisation is covered by approximately 30m to 40m of transported material, similar to the Aquila, Brolga and Crow deposits.

The company announced that the recent follow-up RC and diamond drilling results continue to support a large new gold system at Falcon. The results show continuation of wide gold zones both down dip to +250m depth and along strike for 320m and remains open.

DEG reported that the follow-up RC and diamond drilling has now defined strong gold mineralisation over 320m strike and to +250 metres depth and remains open along strike and at depth. The intense alteration and style of mineralisation observed to date shows strong similarities to the nearby Aquila zone.

High-grade results from follow-up drilling

De Grey reported that the follow-up RC and diamond drilling have returned further encouraging broad gold intercepts that support the previously announced results.

Significant new results from RC drilling to date include 92m @ 1.3g/t Au from 167m in HERC233D (section 7691720N); 66m @ 1.1g/t Au from 114m in HERC253 (section 7691960N); and 51m @ 1.5g/t Au from 205m in HERC254D.

AC drilling update

De Grey announced that the aircore drilling continues to delineate extensions of the Falcon intrusion to the south. DEG said that the southernmost section 7690000N intersected weathered intrusion in three consecutive holes, each 80m apart. The company said that assay results are pending.

Updates and next steps

The company reported that programs of follow up RC and diamond drilling aimed at extending resources at depth and laterally are underway.

De Grey said that RC drilling is currently underway testing along strike to the south on a nominal 80m x80m step out basis. The company announced that diamond drilling of deeper extension will progress as results warrant. Over 2km of strike remains to be RC and diamond drill tested.

DEG said that follow up aircore drilling will be undertaken to test for strike extensions to mineralisation.

Management comments

De Grey Technical Director Andy Beckwith said: “Falcon is rapidly becoming a large intrusive gold system at least 2.4km in strike that remains open in all directions.

Extensional RC drilling is defining strong broad gold mineralisation with many holes ending in mineralisation. The first diamond core tail has extended mineralisation down to 250m depth with a true width of approximately 70m. The gold mineralisation is consistent throughout the strongly brecciated and altered intrusion.

Falcon is an exceptional drilling target and drilling is advancing as a priority. The scale of Falcon demonstrates its potential to significantly add to the overall gold endowment at Hemi.

The mineralised footprint at Hemi also remains open to the west of Aquila, to the north-east and west of Brolga, at Brolga south and to the north-west of Crow.”