Six samples, consisting of sulphide-bearing quartz were sent to
The samples are considered typical of sulphide-mineralized quartz, mined but discarded as barren during historic mining at Yandoit. Similar samples are found on surface dumps around the four sub-parallel gold reef systems discovered to date (
The six samples were crushed and processed by gravity separation at Gekko to produce heavy mineral concentrates. These concentrates were assayed for gold, silver and arsenic (arsenic being a well-known pathfinder for gold).
High gold grades were identified in all concentrate samples, despite free gold not being visible, indicating the likely presence of gold within sulphide. Gold recovery from the six concentrate samples are as follows:
Sample | Mass Yield | Gold Distribution | Other Elements | ||||||
grams | % |
Cumulative | Gold |
Distribution | Cumulative Distribution | Cumulative Gold | Arsenic | Silver | |
% | ppm | % | % | ppm | ppm | ppm | |||
Con 1 | 27.8 | 5.2 | 5.2 | 67.0 | 11.9 | 11.9 | 67.0 | 12,704 | 163 |
Con 2 | 26.7 | 5.0 | 10.2 | 39.4 | 6.7 | 18.6 | 53.5 | 12,483 | 70 |
Con 3 | 18.5 | 3.5 | 13.7 | 37.2 | 4.4 | 23.0 | 49.4 | 11,756 | 38 |
Con 4 | 123.3 | 23.1 | 36.8 | 25.1 | 19.7 | 42.8 | 34.1 | 7,404 | 17 |
Con 5 | 120.1 | 22.5 | 59.3 | 18.4 | 14.1 | 56.8 | 28.1 | 2,808 | 14 |
Con 6 | 217.4 | 40.7 | 100.0 | 31.1 | 43.2 | 100.0 | 29.4 | 2,238 | 23 |
Calculated | 5.3 | 100.0 | 29.4 | 100.0 | 4,947 | 30 |
The weighted average grade from the six concentrate samples produced from rock chips was 29.36 g/t and 30 g/t Ag. This preliminary testwork suggests a substantial amount of gold may be present within sulphide, that was not recoverable within historic mining operations. Gravity combined with flotation may be very effective for the
"We are very pleased to see such high gold grades within sulphide concentrates from Yandoit," commented
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