The Orchard Tank-Acacia mineralised system comprises a strike length of 400m. The highest grade intersection (WADH012) is also the deepest, at 450m below surface (see longitudinal section below).
This is the most extensive zone of zinc-lead-silver-gold-copper mineralisation located to date by De Grey.
Orchard Tank Longitudinal Section
Orchard Tank-Acacia Prospect - Metallurgical testing
Preliminary metallurgical test work has been carried out to determine the optimum grind size, flotation reagent scheme and other process parameters for this mineralisation.
The high metal recoveries (see table below) provide confidence that the type of zinc-silver-lead-gold-(copper) sulphide mineralisation present at Orchard Tank is suitable for the production of commercial concentrates by standard flotation methods.
The best concentrate grade and recovery result derived from a 75µm grind:
|
Preliminary Lead and Zinc Concentrate Flotation Test Results* |
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|
Concentrate |
Concentrate Grade |
Metal Recovery, % |
||||||
|
0 |
Lead % |
Zinc % |
Gold g/t |
Silver g/t |
Lead % |
Zinc % |
Gold % |
Silver % |
|
Lead |
61.8 |
8 |
35 |
3981 |
93.0 |
6.12 |
80.3 |
90.6 |
|
Zinc |
0.61 |
60.0 |
1.6 |
58 |
1.7 |
85.0 |
6.8 |
2.4 |
|
Total Metal Recovery % |
94.7 |
91.1 |
87.1 |
93.0 |
||||
*The head grade of the composite sample tested was 7.6% zinc, 260g/t silver, 4.2% lead and approximately 2.1g/t gold.
Orchard Tank drill hole location plan