- Cyanide leach of the first composite sample with 145 g/t head grade, which consisted of 10% Oxide, 80% Transitional and 10% Sulfide, resulted in 92.7% silvery recovery and 1.40 kg/t sodium cyanide consumption1 on average.
- Cyanide leach of the second composite sample with 114 g/t head grade, which consisted of 10% Oxide, 65% Transitional and 25% Sulfide, resulted in 89.6% silvery recovery and 1.10 kg/t sodium cyanide consumption on average.
- Consistent recoveries (89.6 ~ 92.7% compared to 91%) with the Preliminary Economic Assessment ("PEA") released in
January 2023 , with the total sodium cyanide consumption being lower than the assumptions made in the PEA. - Potential for recovery enhancement up to 93.9% for the second composite sample, through gravity concentration and regrinding, to be evaluated before finalizing the PFS.
We remain on track to deliver the results of the PFS in June. This test program is an important derisking step for
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1 Only accounting for NaCN consumption used in the leach process, exclusive of NaCN losses that could be present in the Merrill-Crow process or losses to tailings |
Additional technical details
The metallurgical test program covered a broad range of characteristics including mineralogy, comminution, gravity concentration, cyanide leaching (utilizing both bottle roll and lifter bottle roll methods), and silver precipitation through zinc dust (employing the Merrill-Crowe process). Tailings testing encompassed evaluations of slurry characteristics (such as thickening, filtration, and rheology), environmental factors, and the transportable moisture limit.
Two life-of-mine and fourteen variability composite samples were used in the test program. Bureau Veritas's Metallurgical Division in
Complete details and analysis of the metallurgical test program will be incorporated into the upcoming PFS. Below is a summary of additional technical details from the test program:
- The Bond ball mill work index and abrasion index generally align with PEA parameters.
- Oxide, transitional and sulfide materials all result in satisfactory silver recoveries.
- Continuous thickening tests for cyanide leach tailings achieved solid loading of 0.75 tonnes per hour per square meter and thickener underflow density of 66% solids. These two parameters outperformed PEA parameters.
- Several pressure filtration tests were completed for cyanide leach tailings. For the 60 mm chamber depth, filtration solid throughput was 142 tonnes per hour per square meter and the filter cake moisture content was 13.4%. These results generally align with PEA parameters.
- The measured transportable moisture limit was 13.5% on average.
- Preliminary cementation tests using zinc dust (
Merrill Crowe ) showed successful reduction of dissolved silver without any co-precipitation of dissolved copper. The efficiency of silver reduction was 98.4% ~ 99.9%.
QUALIFIED PERSON
The metallurgical testwork programs are supervised by
ABOUT NEW PACIFIC
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CAUTIONARY NOTE REGARDING RESULTS OF PRELIMINARY ECONOMIC ASSESSMENT
The results of the independent preliminary economic assessment contained in the PEA are preliminary in nature and are intended to provide an initial assessment of the
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CAUTIONARY NOTE TO US INVESTORS
This news release, including the documents incorporated by reference herein, has been prepared in accordance with the requirements of the securities laws in effect in
Accordingly, information contained in this news release and the documents incorporated by reference herein containing descriptions of the Company's mineral deposits may not be comparable to similar information made public by
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