The latest diamond, reverse circulation (RC) and aircore results from Brolga have increased the zone's dimensions a further 220 metres to more than 560 metres long, up to 300 metres wide and up to 300 metres deep.
Further encouraging assays have been received for the four diamond holes completed and five RC drill holes:
- 100.4 metres at 2.8 g/t gold from 104 metres including 16 metres at 2.6 g/t from 104 metres (pre-collar) and 51.9 metres at 3.2 g/t from 146.4 metres (diamond core),
- 11 metres at 2.1 g/t from 223 metres,
- 29.1 metres at 2.4 g/t from 150 metres,
- 27 metres at 2.1 g/t from 71 metres,
- 35 metres at 1.5 g/t from 174 metres,
- 19 metres at 1.4 g/t from 35 metres, and
- 67 metres at 1.4 g/t from 129 metres.
“Broad gold zones”
De Grey exploration manager Phil Tornatora said: “Mineralisation remains open in most directions at Brolga and now we are seeing gold in the adjacent sediments as well.
“Drilling is providing more detail on the deposits, possibly showing a large-scale southwest plunge to mineralisation at Brolga.
“Many holes have encountered broad gold zones, that have finished in gold mineralisation and remain open.”
Brolga Drilling Plan showing drilling locations and new drilling results
New sediment-hosted gold mineralisation has been intersected in both the hanging wall and footwall sediments, which the company believes provides additional potential for the Hemi area.
Previously at Hemi, gold mineralisation was interpreted to predominantly occur in the intrusions but the new sediment-hosted zones add scope to expand mineralisation with further drilling and enhance the potential for a large tonnage open pit bulk mining opportunity.
Notable intersections include:
- 20 metres at 3.4 g/t from 56 metres including 4 metres at 12.5 g/t from 56 metres (hanging wall),
- 3.9 metres at 11.2 g/t from 221.6 metres including 0.4 metres at 97.3 g/t from 221.6 metres (footwall),
- 17.3 metres at 0.9 g/t from 354.68 metres (footwall), and
- 11.9 metres at 1.0 g/t from 381 metres (footwall).
Brolga is one of two zones of strong, sulphide-rich with gold mineralisation at Hemi, the other being Aquilla.
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.
Tornatora said: “Drilling will continue to focus on extensions to the southwest, northwest and at depth.
“We expect to provide the next update on Aquila and the aircore drilling to the north after Easter.”
Immediate drilling priorities are:
- Extension RC and diamond drilling at Brolga testing to the west, east and down dip,
- Extension drilling to extend Aquila,
- Infill drilling to complete 80-metre sections along the defined Aquila trend, and
- Initial RC drill testing of the large anomalous areas to the north of Aquila.
The plan is constantly being reviewed and may change at any time in response to potential changes in COVID-19 government protocols.
De Grey expects to release further results next week.