New Found Gold Announces Results of Phase III Metallurgical Test Work: Confirms Keats West Zone Gold Recovery; Files Technical Report for the Queensway Gold Project
Highlights:
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Keats West master composite sulphide samples produced a gold concentrate with an average 89.2% overall recovery, confirming the recovery used in the preliminary economic assessment ("PEA")1. - The Program has confirmed production of a saleable gold concentrate and flowsheet presented in the PEA.
- Average recoveries of 87% were achieved from rougher stage flotation on select low grade samples from the Keats, Golden Joint, Lotto and Iceberg zones initially tested in Phases I and II of the Queensway metallurgical testing program2, with further work planned.
- Additional Feasibility Study level metallurgical test work is planned, including sensor-based sorting, comminution, mineralogy, gravity, cyanidation leaching, flotation, equipment sizing tests, with results expected in H2/26.
Program Overview
The Program commenced in late 2024 and focused on master composites from
All metallurgical laboratory test work was carried out by
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The primary focus of the Program was to test mineralized sulphide samples from
Approximately 660 meters of drill core with a combined weight of 2,700 kilograms and comprising 68 variability composites was selected for the Keats West test work. Three master composites, namely
The appropriate treatment flowsheet is via gravity gold recovery and flotation of gravity tails to produce a saleable gold concentrate, confirming the flowsheet presented in the Queensway PEA (Figure 4).
Mineralogical Gold Deportment Study
A mineralogical gold deportment study in support of the Program was conducted on the Keats West Weak master composite, and on a blend of the Keats West Moderate and
- The rock mineral assemblage was essentially the same in all tested Queensway master composites from the Keats, Lotto, and Iceberg zones, with mineralogy dominated by quartz, illite, chlorite, albite, with minor carbonate and rutile. Visually, the Keats West Weak and Keats West Mod/Strong samples contained notably lower feldspar contents.
- The TOC assay for the Keats West Mod/Strong material had a higher carbonaceous matter content (0.33% TOC); flotation was added to the flowsheet to improve recovery.
- The sulphide mineralogy was dominated by pyrite and arsenopyrite in all mineralized materials tested. The total sulphide contents were similar in all study samples, with the Keats West Weak sample containing the highest arsenopyrite content (1.25 weight percent arsenopyrite).
- Submicroscopic gold is a minor contributor to gold grade in the samples, except in the Keats West Weak sample where it accounted for 49% of the gold. The importance of submicroscopic gold in the Keats West Weak sample was partly due to the lower overall gold content of this material, and the relatively high arsenopyrite content, where arsenopyrite is enriched in solid solution gold.
Metallurgical Test Results
Comminution tests were completed on the three master composites. The tests included the semi-autogenous grinding ("SAG") mill comminution ("SMC") breakage test to determine A x b values, Bond
The three master composites were subjected to a series of tests to evaluate a flowsheet consisting of gravity recovery followed by sulphide flotation of gravity tails with rougher concentrate regrind and two stages of cleaners. Overall gold recoveries were 86% to 96% with an average of 89.2%, confirming the slightly more conservative 88% flotation stage recovery used for
Table 1. Keats West Master Composites - Flotation Results (Lock Cycle Tests).
Sample |
Calculated |
Overall Gold |
Concentrate |
Concentrate |
|
(Au g/t) |
(Au %) |
(Au g/t) |
(As %) |
|
4.33 |
85.6 |
40.6 |
4.2 |
Keats West Moderate |
3.63 |
86.2 |
47.1 |
4.2 |
|
10.2 |
95.9 |
26.0 |
0.9 |
Average |
6.1 |
89.2 |
37.9 |
3.1 |
Keats, Golden Joint, Lotto, and Iceberg zones
Samples from the Keats, Golden Joint, Lotto and Iceberg zones tested in Phases I and II of the Queensway metallurgical testing program received additional test work in the Program, with a focus on further optimization to increase recoveries.
Select lower grade variability composites (approximately less than 3 grams of gold per tonne "g/t Au") with elevated concentrations of sulphides (1-2% S; greater than 2,000 ppm As) from the Keats, Golden Joint, Lotto, and Iceberg zones tested as part of the Phase 1 metallurgical test work program were retested using a gravity-flotation flowsheet. Samples were subjected to gravity, rougher flotation of gravity tails and leaching of rougher concentrate. In most cases this improved overall gold recoveries compared to previous gravity-CIL tests.
Average recoveries of 87% were achieved from rougher stage flotation. It is noted that cleaner flotation and optimization work was not completed and will be tested in the next stage of metallurgical test work.
The results of this work support a gravity-flotation flowsheet to treat this material as outlined in the Queensway PEA.
Next Steps
The Company is currently planning additional metallurgical test work, consisting of a Feasibility Study level metallurgical program, with results expected in H2/26. This work is being conducted by Base Metallurgical.
The overall scope of the next phase of work includes:
- Establishment of geometallurgical models,
- Complete variability test work across main mineralized zones,
- Continue to establish a gravity/CIL flowsheet and leaching conditions for plant design,
- Continue to establish a gravity/gold flotation flowsheet for sulphide-associated mineralization that does not respond well to cyanidation gold extraction,
- Comminution variability test work, including bond ball and rod work indices, SMC tests and abrasion tests,
- Environmental related tests, including acid-base-accounting and humidity cell.
Technical Report
The Company has filed the technical report for the PEA for Queensway titled "NI 43-101 Technical Report for the
The Technical Report was prepared by
The Technical Report has been filed under the Company's profile on SEDAR+ at www.sedarplus.ca and can also be found on
Qualified Person
The scientific and technical information disclosed in this press release was reviewed and approved by
About
The Company has completed an initial mineral resource estimate and PEA at Queensway (see
Recent drilling continues to yield new discoveries along strike and down dip of known gold zones, pointing to the district-scale potential of the 175,450 ha project that covers a 110 km strike extent along two prospective fault zones.
Chief Executive Officer
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Acknowledgements
Neither the
Cautionary Statement
The PEA is preliminary in nature, it included inferred mineral resources that are considered too speculative geologically to have economic considerations applied to them that would enable them to be categorized as mineral reserves and there is no certainty that the PEA will be realized.
Forward-Looking Statement Cautions
This news release contains certain "forward-looking statements" within the meaning of Canadian securities legislation, relating to the results of the Program and the interpretation of such results; further metallurgical test work and the scope and timing thereof; the PEA; exploration, drilling and mineralization on Queensway; the initial mineral resource estimate; a potential Feasibility Study; the interpretation of drilling and assay results, the extent of mineralization and the discovery of zones of high-grade gold mineralization; future exploration and the focus and timing of same; the merits of the
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