De Grey Mining Limited (ASX: DEG) continues to build on the world-class Hemi Gold Discovery, located approximately 60km south of Port Hedland in Western Australia.
Manager Director, Glenn Jardine, said the latest drilling results from the Falcon intrusion at Hemi has defined strong mineralisation over a strike length of approximately 1km north-south.
Falcon is located approximately 600m west of the Brolga zone and immediately south of the Aquila zone. The Falcon intrusion extends for a further 2km south as confirmed in shallow wide-spaced aircore drilling. Further RC drilling is planned to test this target area.
The bedrock mineralisation is covered by approximately 40m of transported material similar to the Aquila, Brolga and Crow zones.
The mineralisation at Falcon is intimately associated with highly brecciated and extensively sulphide altered portions of the north-south orientated subvertical intrusion. The style and intensity of alteration and brecciation is similar to the nearby Aquila deposit.
Step-out drilling at Falcon to a vertical depth of approximately 500m is testing the potential for extensions to known mineralisation. A programme of six initial wide spaced (160m) step out holes have been planned to test the mineralisation to approximately 500m depth along the current 1km strike of mineralisation at Falcon.
The first of the step out holes, HERC580D located at the northern end of Falcon, has intersected well mineralised intrusive over 90m from 492 to 582m downhole.
There is historically a strong correlation between logged sulphides and gold mineralisation in the zones at Hemi. HERC580D is located 20m south and 300m below the intersection of 72m @ 1.6g/t Au in HERC654. Hole HERC581D, located 320m further south of HERC580D, is currently in progress.
The deeper drilling demonstrates a thick zone (~45m true thickness) of sulphide mineralisation exists within the intrusion with assays pending. Mineralisation dips steeply to the east, extends to at least 500m depth and remains open at depth and along the current 1km of strike.
Near surface shallow RC drilling testing the Falcon zone to the north, has successfully extended mineralisation towards the Aquila zone. Mineralisation remains open at depth. New significant results on this northern most section 76912000N include: 32m @ 1.8g/t Au from 63m and 72m @ 1.6g/t Au from 108m.
Falcon is also being tested with RC and diamond infill drilling to 80m x 40m spacing to establish continuity for resource estimation purposes. This drilling has been conducted to a vertical depth of approximately 350m along the current 1,000m strike. New significant intervals include: 45m @ 1.5g/t Au from 175m; 41m @ 2.2g/t Au from 61m; and 25m @ 1.2g/t Au from 148m.
The Falcon intrusion extends for at least another 2km to the south of the known mineralisation. Drilling across the southern area to date has not defined significant mineralisation. However, the bulk of this work is wide-spaced, shallow aircore drilling. Deeper RC drilling to effectively test this large target area in more detail is planned for the current quarter.
The latest extensional drilling at Falcon confirms the increasing scale and continuity of the zone. Wide sulphide mineralisation has now been intersected to approximately 500m and remains open at depth. Step out diamond drilling will continue at depth along the current 1000m long strike at Falcon,” Mr Jardine said.
“Strong gold mineralisation has also been extended near surface in the north of Falcon proximal to the Aquila zone.
“The Falcon intrusion has been intersected in shallow aircore drilling for approximately 2km to the south of the known mineralisation. Deeper RC drilling to more effectively test this large target area in more detail is planned for the current quarter.
“Results of extensional drilling completed this year at Falcon, Brolga, Aquila, Crow and Diucon/Eagle demonstrate that Hemi has more potential and remains open along strike and at depth. Results of infill drilling announced this year increasingly confirm continuity of mineralisation at each deposit and in the case of Crow, has identified multiple new sub-vertical lodes.”
