Heliostar Reports 80.4% Gold Recovery from High Grade Panel at the Ana Paula Project, Mexico
- Gold recovery averaged 80.4% from seven composite samples
- Gravity testwork suggests over 31% of the gold may be gravity recoverable
- None.
Highlights:
80.4% average gold recovery from seven composites representative of the High Grade PanelGold recoveries range from 74.6 -
88.1% for these samplesGravity testwork suggests greater than
31% of the gold may be gravity recoverableConfirms the the Company's interpretation that recoveries from high-grade gold mineralization can utilize simpler, lower cost, conventional milling processes
Metallurgical process is based on a conventional 75 micron grind size and Carbon-in-Leach (CIL) flowsheet
Vancouver, British Columbia--(Newsfile Corp. - October 3, 2023) - Heliostar Metals Ltd. (TSXV: HSTR) (OTCQX: HSTXF) (FSE: RGG1) ("Heliostar" or the "Company") is pleased to present positive preliminary metallurgical test results as part of the Rescoping Study of the Ana Paula project in Mexico ("Ana Paula" or the "Ana Paula Project").
Heliostar CEO, Charles Funk, commented, "These metallurgical results represent a significant step-change in our understanding of the Ana Paula Project. An
Summary of Metallurgy Results
Heliostar submitted eight composite samples, prepared from drill holes completed in the 2023 Ana Paula drill campaign to Blue Coast Research Ltd. Seven samples were collected from the High Grade Panel and one from the footwall to the panel. Composites were generally selected from continuous intervals of similar grade and lithologies from spatially diverse areas of the deposit. Composites were then split into two workflows: the first focused on gold recoveries at various grind sizes using kinetic and carbon in leach (CIL) bottle roll testing, while the second tested the potential for gold recovery using gravity techniques.
Gold recovery averaged
Gold recovery to gravity concentrates averaged
One composite was an outlier and returned a
The composites samples were designed to test and provide guidance on potential recoveries from the most financially impactful ounces from the High Grade Panel. Results indicate the recoveries can be sufficiently high using conventional processing techniques. This supports continued evaluation of Ana Paula as a high-grade underground mine using conventional processing flowsheets.
| Composite | CIL Bottle Roll (75µm) | Gravity Recovery | Comment | |||
| Au Recovery (%) | Calculated Head Gold (g/t) | Direct Head Gold (g/t) | Gold Recovery (%) | Mass Pull (%) | ||
| AuBOT23-01 | 79.4 | 8.19 | 6.51 | 51 | 0.03 | Centre of High Grade Panel |
| AuBOT23-02 | 78.3 | 8.21 | 8.54 | 35 | 0.05 | East within High Grade Panel |
| AuBOT23-03 | 27.7 | 2.55 | 2.48 | 16 | 0.03 | Footwall to High Grade Panel |
| AuBOT23-04 | 75.4 | 13.92 | 13.69 | 31 | 0.02 | Centre-West of High Grade Panel |
| AuBOT23-05 | 88.1 | 9.82 | 11.29 | 69 | 0.02 | Granodiorite Rocktype |
| AuBOT23-06 | 74.6 | 13.84 | 13.53 | 53 | 0.03 | Limestone/Hornfels/Skarn Rocktype |
| AuBOT23-07 | 86.8 | 17.00 | 14.78 | 51 | 0.02 | Down-plunge within High Grade Panel |
| AuBOT23-08 | 80.4 | 21.26 | 18.25 | 40 | 0.02 | Up-plunge within High Grade Panel |
Table 1: Composite identification and gold recovery by process
Metallurgy Sampling Details
As part of the Ana Paula Rescoping study, Heliostar commenced test work focusing on the metallurgical characteristics of the High Grade Panel. Historical test work was designed using an open pit mining scenario, where most of the ore tonnes (approximately
Heliostar is rescoping the Ana Paula project as a high grade underground mine using a conventional comminution, gravity, floatation, and CIL processing circuit. The Company is using previous test work as a foundation for future work while recognizing opportunities to optimize for mining scenarios and grade changes. Composite samples were created from PQ sized core drill holes that were completed early in the 2023 drill program. Coarse rejects from the selected intervals were combined to bring the total weight of each sample to approximately 25-30 kilograms.
Figure 1: Plan map of metallurgical composite source locations
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Composites range from 25.2 to 62.0 metres in length and represent continuous intervals of similar grade and lithology that are spatially distributed across the mineralized zone where feasible. In two cases, continuous interval of the same lithology were not available and smaller intervals were collected from around the High Grade Panel (Figure 1). All samples were selected from within or proximal to the High Grade Panel. Six samples represent the Polymictic Breccia, while two other samples represent Sediments/ Hornfels and Granodiorite/Intrusive.
Direct head grades of the eight composites range from 2.48 to 18.25 g/t gold and average 11.13 g/t gold. Though this grade is high, particularly in comparison to the previous metallurgical work, it should be noted that five of the eight samples represent continuous intervals of mineralization across the centre of the High Grade Panel. These were selected in such a way that that could represent gold mineralization over significant volumes for the deposit, and were not built from isolated samples based on grade.
Heliostar is focused on improving the understanding of the gold recoveries under various extraction scenarios. The results presented in this release will refine future metallurgical work to define the most effective, low cost, technically simple approach to maximise gold recoveries for an underground mining operation. This work will include combining the gravity recovery and CIL processes which has the potential to further improve overall recoveries.
Statement of Qualified Person
Andrew Kelly, P.Eng., of Blue Coast Research Ltd., a Qualified Person, as such term is defined by National Instrument 43-101 - Standards of Disclosure for Mineral Projects ("NI 43-101"), has reviewed and approved the results of the metallurgical test program.
Art Ibrado, PhD, PE, of Fort Lowell Consulting, a Qualified Person, as such term is defined by NI 43-101, has reviewed and approved the results of the metallurgical test program.
Samuel D. Anderson, CPG., Vice President of Projects, of Heliostar Metals Limited, a Qualified Person, as such term is defined by NI 43-101, has reviewed the scientific and technical information that forms the basis for this news release and has approved the disclosure herein.
About Heliostar Metals Ltd.
Heliostar is a junior mining company with a portfolio of high-grade gold projects in Mexico and Alaska.
The Company is focused on developing the
The Ana Paula Project deposit contains proven and probable mineral reserves of 1,081,000 ounces of gold (630,000 proven and 451,000 probable ounces) at 2.38 grams per tonne ("g/t") gold and 2,547,000 ounces of silver (1,322,000 proven and 1,226,000 probable ounces) at 5.61 g/t silver. Ana Paula hosts measured and indicated resources of 1,468,800 ounces of gold (703,800 measured and 765,000 indicated ounces) at 2.16 g/t gold and 3,600,000 ounces of silver (1,637,000 measured and 1,963,000 indicated ounces) at 5.3 g/t silver. The asset is permitted for open-pit mining and contains significant existing infrastructure including a portal and a 412-metre-long decline.
References
- An updated prefeasibility study titled "Ana Paula Project NI 43-101 Technical Report Preliminary Feasibility Study Update" was filed on SEDAR on April 6, 2023, with an effective date of February 28, 2023, prepared for the Company by Daniel H. Neff, PE, Art S. Ibrado, PhD, PE, Richard K. Zimmerman, RG, SME-RM, Craig Gibson, PhD, CPG, Andrew Kelly, P.Eng., Gordon Zurowski, P.Eng., Paul Daigle, P.Geo., Gilberto Dominguez, PE and James A. Cremeens, PE, PG.
For additional information please contact:
Charles Funk
Chief Executive Officer
Heliostar Metals Limited
Email: charles.funk@heliostarmetals.com
Rob Grey
Investor Relations Manager
Heliostar Metals Limited
Email: rob.grey@heliostarmetals.com
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