De Grey Mining Limited is making progress with its drilling program at the Hemi Gold Discovery, located approximately 60 kilometres south of Port Hedland in Western Australia.
The Falcon intrusion is situated roughly 600 metres west of the Brolga zone and immediately south of the Aquila zone. Strong mineralisation has been defined over a strike length of approximately 1 kilometre north-south.
A program of six initial wide spaced (160 metre) step out holes have been planned to test the mineralisation to approximately 500 metres depth along the current 1 kilometre 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 90 metres from 492 to 582 metres downhole.
De Grey said there is historically a strong correlation between logged sulphides and gold mineralisation in the zones at Hemi.
HERC580D is located 20 metres south and 300 metres below the intersection of 72 metres at 1.6 grams per tonne (g/t) of gold (Au) in HERC654. Hole HERC581D, located 320 metres further south of HERC580D, is currently in progress.
The deeper drilling demonstrates a thick zone (approximately 45 metres true thickness) of sulphide mineralisation exists within the intrusion with assays pending. Mineralisation dips steeply to the east, extends to at least 500 metres depth and remains open at depth and along the current 1 kilometres 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:
- 32 metres at 1.8 g/t Au from 63 metres in HERC653
- 72 metres at 1.6 g/t Au from 108 metres in HERC654
Falcon is also being tested with RC and diamond infill drilling to 80 metre x 40 metre spacing to establish continuity for resource estimation purposes.
This drilling has been conducted to a vertical depth of approximately 350 metres along the current 1,000 metre strike. New significant intervals include:
- 45 metres at 1.5 g/t Au from 175 metres in HERC420D
- 41 metres at 2.2 g/t Au from 61 metres in HERC558
- 25 metres at 1.2 g/t Au from 148 metres in HERC560
The Falcon intrusion extends for at least another 2 kilometres 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.
The company notes that deeper RC drilling to effectively test this large target area in more detail is planned for the current quarter.