Heliostar Reports 80.4% Gold Recovery from High Grade Panel at the Ana Paula Project, Mexico
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Heliostar Reports 80.4% Gold Recovery from High Grade
Panel at the Ana Paula Project, Mexico
Highlights:
• 80.4% average gold recovery from seven composites representative of the High Grade Panel
• Gold recoveries range from 74.6 - 88.1% for these samples
• Gravity testwork suggests greater than 31% of the gold may be gravity recoverable
• Confirms 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, Canada, October 3rd, 2023 – Heliostar Metals Ltd. (TSX.V: HSTR, OTCQX: HSTXF, FRA: 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 80.4% recovery using conventional grind sizes and
recovery techniques indicates the High Grade Panel has the potential to be processed through a simple
mill flowsheet. The analysis was completed on composite samples collected from a range of locations,
host lithologies, and grade ranges throughout the High Grade Panel. Broadly speaking, high -grade gold
mineralization has more coarse-grained gold and is easier to recover than the surrounding low-grade halo
of mineralization. The High Grade Panel does not display refractory characteristics. These results will lead
to additional optimization work and inform the cutoff grades for gold mineralization in next month’s
planned resource update.”
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 interv als 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 80.4% for seven of the eight samples using a primary grind size of approximately
80% passing 75 microns and CIL extraction (the eighth sample was from t he High Grade Panel footwall).
Gold recoveries ranged from 74.6% to 88.1% for the seven samples. Gold recovery results were similar
without carbon and at 45- and 20-micron primary grind sizes.
Gold recovery to gravity concentrates averaged 47% for the s ame seven of eight samples. During these
tests, 2 kilograms (kg) of sample was ground to a primary grind size of approximately 80% passing 75µm
and then passed through a laboratory scale Knelson concentrator. The Knelson concentrate was
subsequently upgraded on a superpanner until the pan tip represented 0.02% to 0.05% of the original
feed mass. Gold recovery to the superpanner tip ranged between 31% and 69%. This suggests the
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potential for gravity recovery from these samples, however future work, inclu ding Extended Gravity
Recoverable Gold tests, are underway to refine the potential for gold recovery using gravity techniques.
One composite was an outlier and returned a 28% gold recovery at a 75 -micron grind size using CIL
extraction. This sample represents an area in the footwall to the High Grade Panel that has a lower overall
grade than the other samples at 2.48 grams per tonne (g/t) gold. The cause of this lower recovery is
unclear but is being further investigated with a gold deportment study, au tomated mineralogy, and
additional assaying.
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 70%) were hosted in the Intrusive Suite
(granodiorite lithology) domain with an average life of mine grade of 2.38 g/t gold for proven and probable
reserves1. As such, this historic test work focused on optimiz ing for these parameters by quantifying
recoveries from these grade ranges and then optimizing potential recoveries by evaluating atmospheric
oxidation. Historic test results for the High Grade Breccia Lithologic Domain (hosting much of the High
Grade Panel) ranged from 62 to 68% gold recoveries for whole rock leaching. However, no further work
was done to optimize recoveries using conventional milling technology or quantify recoveries within the
high grade domains of the unit.
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
1090 West Georgia Street, Suite 700, Vancouver BC, V6E 3V7, Canada -- Tel +1 236 429 9306
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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
Composites range from 25.2 to 62.0 metres in length and represent continuous intervals of similar grade
and litholog y that a re spatially distributed across the mi neralized 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 t he 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.
1090 West Georgia Street, Suite 700, Vancouver BC, V6E 3V7, Canada -- Tel +1 236 429 9306
www.heliostarmetals.com | Trading Symbols: TSX.V: HSTR, OTCQX: HSTXF, FRA: RGG1
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 N I 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 100% owned Ana Paula Project in Guerrero, Mexico. In
addition, Heliostar is working with the Mexican federal and local government to permit the San Antonio
Gold Project in Baja Sur, Mexico. The Company continues to explore the Unga Gold Project in Alaska,
United States of America.
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
1 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: [email protected]
1090 West Georgia Street, Suite 700, Vancouver BC, V6E 3V7, Canada -- Tel +1 236 429 9306
www.heliostarmetals.com | Trading Symbols: TSX.V: HSTR, OTCQX: HSTXF, FRA: RGG1
Rob Grey
Investor Relations Manager
Heliostar Metals Limited
Email: [email protected]
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