De Grey Mining Limited (ASX: DEG) has confirmed continuity of gold mineralisation at the Brolga Zone within the exciting Hemi Discovery near Port Hedland in Western Australia.
Technical Director, Andy Beckwith, said strong and extensive gold mineralisation is now defined across the four sections and defines a robust and large growing volume of mineralised intrusive at Brolga.
Mr Beckwith said the gold-sulphide mineralisation is well defined by RC drilling and interpreted to be dipping moderately to the south (local grid) with a large footprint over +340m of strike, up to +300m lateral width, up to 200m depth and remains open along strike and down dip.
He highlighted the importance of the shallower dipping mineralisation as being significantly material as it has the potential to increase ounces per vertical metre within a future open pit and may reduce the overall strip ratio.
“Brolga is growing substantially, we continue to increase the overall footprint of the gold-sulphide mineralisation, particularly to the west and down dip where substantial thicknesses of mineralisation remain open,” Mr Beckwith said.
“We have now confirmed the strong correlation between gold and sulphides. The recent four RC holes to the south and west have logged some of the strongest sulphide mineralisation noted to date.
“Drilling is planned to continue with one RC and two diamond rigs testing the limits of mineralisation at Hemi.”
To date, recent RC drilling has confirmed the sulphide mineralisation in fresh intrusive correlates well with the known gold mineralisation. Ongoing RC drilling is currently underway on section 30,400E, a further 80m to the west. Geological logging of the initial two RC holes (HERC032 – 033) highlights further wide intersections of strong sulphide mineralisation. This drilling on 30,400E extends the strong sulphide mineralisation to +420m of strike and remains open. Diamond drilling is underway on 30640E and aircore drilling is testing areas north of Aquila.
Mr Beckwith said the priority RC and diamond drilling program continues to test the scale of the Brolga and Aquila deposits on 80m spaced sections and nominal 80m spaced holes on section. The aim is to continue defining the lateral and down dip extensions to an initial nominal 400m vertical metres prior to commencing infill resource drilling.
Hemi is a new discovery under 30m of transported cover, with the first aircore drill results reported in mid-December 2019 and further encouraging high grade results subsequently reported during February and March 2020. Two zones of strong, broad sulphide rich mineralisation with high grade gold has been defined in the Aquila and Brolga Zones.
The gold zones represent a major new discovery for De Grey and potentially a new and exciting new style of mineralisation in the Pilbara region. The scale, grade and overall dimensions of the mineralisation defined to date is larger than all the other gold deposits De Grey has defined within the project area. Hemi has substantial potential to increase De Grey’s current 1.7Moz of shallow gold resources.
