Galena Mining Ltd (ASX:G1A) (FRA:GM6) has returned more broad high-grade lead-silver results in the fifth and final batch of assay results from the 2020 drilling program at Abra Base Metals Project in Western Australia.
The program was initially planned to consist of around 15,000 metres to 18,000 metres of drilling, with three objectives - lead-silver orebody infill, drilling into selected prospective ‘metal rich’ zones for potential life of mine plan optimisation and gold-copper exploration.
An additional 16 drill-holes were added to the 2020 drilling program in the area around drill hole AB147 – which previously encountered 86.1 metres of combined down-hole cumulative thickness of significant intersections and confirmed a ‘metal rich’ zone not currently in the early years of the mine plan used for the feasibility study.
Updated mine plan
The aim of the drilling program is to define the zone with 30-metre by 30-metre better drill-hole spacing to enable its inclusion in detailed mine planning for the early years of an updated mine plan.
Galena managing director Alex Molyneux said: “With these being the final assays from the 2020 Abra drilling program, we’re already quite advanced on an updated mineral resource estimate for the project.
“Furthermore, I believe the success of this program in defining and extending the shallow, metal-rich zone on the north-eastern side of the orebody will present well for mine plan optimisation opportunities.”
The final batch of assays returned the following lead-silver mineralised intersections:
- 22.5 metres at 9.0% lead and 17 g/t silver from 301 metres;
- 14.9 metres at 12.3% lead and 15 g/t silver from 391.7 metres;
- 40.9 metres at 7.6% lead and 14 g/t silver from 425.0 metres;
- 27.9 metres at 8.6% lead and 16 g/t silver from 378.4 metres;
- 15.9 metres at 11.8% lead and 28 g/t silver from 378.9 metres;
- 13.5 metres at 7.7% lead and 22 g/t silver from 398.9 metres;
- 13.1 metres at 8.2% lead and 35 g/t silver from 291.1 metres;
- 21.2 metres at 8.5% lead and 19 g/t silver from 307.8 metres;
- 10.8 metres at 13.3% lead and 19 g/t silver from 369.4 metres;
- 13.6 metres at 11.3% lead and 27 g/t silver from 352.4 metres;
- 19.9 metres at 6.9% lead and 13 g/t silver from 287.2 metres;
- 11.9 metres at 10.2% lead and 48 g/t silver from 271.8 metres;
- 17.3 metres at 7.0% lead and 22 g/t silver from 276.4 metres; and
- 11.6 metres at 9.6% lead and 16 g/t silver from 411.4 metres;
Abra Project drilling density following completion of the 2020 Abra drilling program.
Exceeding thickness expectations
Galena considers the 2020 Abra drilling program highly successful in comparison to the Abra October 2019 resource.
A total of 26 of the 57 drill-holes drilled exceeded or met grade and thickness expectations compared to the October 2019 resource model, 17 drill-holes met and only 14 drill-holes fell below expectations.
Additionally, eight of the 57 drill-holes showed cumulative down-hole significant lead-silver intersections in excess of 50 metres, more than any prior program at Abra.
These included drill-hole AB147, the best high-grade lead-silver drill-hole in Abra’s history in terms of cumulative thickness and grade.
Mineral resource estimate pending
The company has retained Optiro Pty Ltd to incorporate the extensive data received from the 2020 drilling program into an independently prepared updated mineral resource estimate.
Optiro started work on the update in December to front-load their activities to the extent possible and shorten the time between receipt of final assays and completion of the estimate.
Working with information received through January and February, Optiro has largely completed re-modelling of Apron Zone mineralised domains and is working on re-modelling the Core Zone mineralisation.
With the inclusion of the final assays into the model, an updated mineral resource estimate is expected to be completed within the coming weeks, enabling the commencement of an updated mine plan.