Plan Moving Forward
The next phase will process the tailing and the remaining waste rock, as agglomerated product. The lab tests have shown that agglomerated tailing/waste rock gave very “fast” leaching. Lab results show average recovery of 50% of Au within two weeks.
For a “fast” leach:
- 50,000 tons per month
- At grade of 0.035 opt Au
- With recovery of 50%
- The recovered gold would be 875 oz Au per month for twelve months suggesting 10,500 oz of Au.
There are total of 500,000 tons available for processing. In this scenario, within a year all 500,000 tons will be crushed/agglomerated, and the process will recover 10,500 oz Au.
With the updated information from KCA lab results, we can see the following scenario unfolding as we move forward with fast leaching and the head grade of 0.035 opt:
- As we crush/agglomerate/stack, at a rate of 50,000 tons per month (or 12,500 tons per week).
- If we continue this for ten months…
- And put fresh material on sprinkler every week…
- The operation will ramp up on recovery of gold at 433 oz for the first month followed up by 693 oz on the second month and peak at production of up to 875 oz for ten months and then taper off for last two months, as the heap becomes depleted.
- This would also mean moving of loaded carbon every week, which would contain over 200 oz, which would be sent to
Metals Research for refining. - This would give a steady inflow of revenue on a weekly basis of about
$370,000 per week for eight to twelve months.
This could continue flush for approximately eight to ten months, depending on how much material is utilized/misplaced during construction and prior ops. Stacking/flush production could continue for ten months, followed by tailing off for several months thereafter, so overall cash margin from ops could be in the
Recent metallurgical test results are in line with previous testing by others, including Continental. By stacking properly crushed and agglomerated material we can anticipate an initial surge of production of ~40-60% of contained gold the first ten days or so under leach, with the balance trickling out over several months. Implementing a continuous program of stacking and leaching, we should experience an ongoing stream of surges, creating a plateau of rapid recovery until all material has been stacked, followed by an extended period of slowly decreasing offtake.”
Kiedoch Kim, Bonanza’s Process Manager, said, “For the last three months, samples of tailing and waste rock were sent to
Goldrock Resources Internal Non 43-101 technical report PEA 2017:
- Assayed head grade between 0.046 opt, 0.067opt, & calculated head grade of 0.117 opt Au.
- With recovery of 82.9% to 88.1%.
- The leach rate was fast with majority of recovery done within 20 days. KCA (2022):
- Assayed head grade was between 0.034 opt and 0.046 opt Au.
- With recovery of 30% and 70% with average of 50%. The leaching was continuing at the last update.
- The leach rate was fast with recovery of 50% average at two weeks.
The confirmation test work by KCA was able to confirm the fast leach rate.”
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