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September 9, 2026 TheNewswire - Vancouver, British Columbia Radius Gold Inc. (TSXV: RDU,OTC:RDUFF) ("Radius" or the "Company") is pleased to report multi-element geochemical results from rock sampling within the core of its Tierra Roja copper project in southern Peru. The results display metal associations consistent with a porphyry copper system and provide further support for the Company's geological model.
Highlights
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Multi-element ICP data from rock samples in the core area show clear associations between copper and silver, gold, potassium and molybdenum.
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Soil sampling reveals an inverse relationship between copper and zinc, with lead and zinc depleted over the high-copper core and elevated on the periphery.
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Elevated potassium (2 % K) in both rocks and soils is consistent with potassic alteration of the host Jurassic andesite volcanics.
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Molybdenum values in rocks (commonly 5–10+ ppm) are higher than those in the surrounding soils (generally 4 ppm), supporting residual primary signatures in the core.
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Results remain restricted to the approximately 600 m x 800 m core zone previously described by the Company. A larger, property-wide geochemical survey is planned to enable effective vectoring.
Results – Rock Samples
The dataset comprises multi-element analyses (including Cu, Ag, Au, Mo, As and K) from rock samples collected across the core of the Tierra Roja target. The accompanying scatter plots (Figure 1) illustrate the principal metal relationships.
Figure 1: Multi-element geochemistry plots for rock samples from Tierra Roja.
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From a porphyry copper perspective, several observations are noteworthy:
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Copper shows a positive association with both silver and gold. Higher copper values are accompanied by elevated silver and gold, a common feature in the upper, more oxidized portions of many Andean porphyry systems.
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Potassium enrichment is evident, with several samples exceeding 2 % K. These elevated potassium values are spatially associated with the high-copper core zone and are consistent with potassic alteration in the deeper portions of a porphyry system.
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Molybdenum is present at levels typically 5–10 ppm and locally higher. While the Cu–Mo correlation is not strongly linear, these molybdenum concentrations are distinctly higher than those observed in the surrounding soils (generally below 4 ppm - see Figure 3) and fall within the range expected for the upper levels of a porphyry copper system.
Maps showing the spatial distribution of the samples and assay results are shown in Figure 2 below.
Figure 2: Maps showing distribution of rock samples and assay values for A: Au (ppm), B: Ag (ppm), C: K (%), D: Mo (ppm). Core zone indicated by black ellipse.
Collectively these relationships support the interpretation that the intense silica-sericite alteration and copper-oxide mineralization exposed over the ~600 m x 800 m core zone represent the upper levels of a porphyry copper system. The data do not, however, define the location of the highest-grade or deepest parts of that system.
Fifty-nine soil samples collected across a broader area surrounding the core zone provide complementary information on metal distribution and alteration. Scatter plots are shown in Figure 3.
Copper versus molybdenum in the soils shows only a weak positive trend, with modestly higher molybdenum accompanying higher copper. Both copper and molybdenum appear subdued relative to the rock dataset, consistent with leaching of these metals within the soil profile.
Copper versus zinc displays a clear inverse relationship. This pattern is reinforced by the spatial distribution of lead and zinc (Figure 4): the high-grade copper core is characterized by relatively low lead and zinc values, while higher lead and zinc concentrations occur on the periphery. This metal zonation is a classic signature of porphyry copper systems, in which copper is concentrated toward the centre and base metals are displaced outward.
Copper versus potassium in the soils also shows elevated potassium values, with numerous samples above 2 % K. Unaltered intermediate volcanics (calc-alkaline andesites) of the type that host mineralization at Tierra Roja typically contain approximately 1–2 % potassium or less. The higher potassium values recorded in the soils are therefore interpreted as reflecting potassic alteration of the surrounding Jurassic volcanic sequence.
Lead versus zinc shows a weak positive correlation. In the context of the inverse copper–zinc relationship, this indicates that lead and zinc behave similarly to one another and are relatively depleted over the copper-rich core while remaining elevated in the peripheral soils — again consistent with outward metal zonation around a porphyry centre.
Figure 3: Multi-element geochemistry plots for soil samples from Tierra Roja.
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Figure 4: Maps showing distribution of soil samples and assay values (IDW interpolation) for E: Pb (ppm) and F: Zn (ppm). Core zone indicated by black ellipse.
Next Steps
Radius intends to complete a larger multi-element geochemical survey across the entire Tierra Roja property to allow the Company to map metal zonation, identify vectors toward higher copper or molybdenum grades, and better integrate the surface geochemistry with the existing hyperspectral and geophysical datasets. Sampling will commence in September, and the results of the expanded survey will be reported as they become available.
Permitting Update: Tierra Roja
Permitting at Tierra Roja has taken longer than originally anticipated because the project is located on unoccupied state-owned barren land, which requires a surface right from the Superintendencia Nacional de Bienes Estatales (SBN) in addition to exploration authorization from the Gerencia Regional de Energía y Minas (GREM) of Arequipa.
As previously disclosed, the Company holds provisional SBN authorization for surface access over that state land. During the SBN process the Company received an observation relating to the project coordinates on the submitted plan. The observation was appealed in a timely manner, did not become a final resolution, and the appeal was upheld. Provisional surface access remains in place. That provisional authorization supports preparatory surface work, including soil sampling. Proof of the provisional SBN authorization has been submitted to GREM, and the Company's application for Authorization to Initiate Exploration Activities remains in process.
The remaining SBN steps are state valuation of the surface right and execution of the definitive contract. Commencement of drilling remains subject to GREM authorization. The Company is making progress on these steps.
Luke Longridge, PhD, P.Geo, President commented:
"The multi-element results from the core of Tierra Roja show the metal associations and zonation of a porphyry copper system and are consistent with the geological features I have seen on the ground, including potassic alteration, porphyry dykes, and widespread copper oxides.
Although it has been frustrating that surface-rights permission on state land has taken this long, the resolution of the initial SBN authorization means we can get on with the property-wide sampling program and we are optimistic that the remaining valuation and definitive contract can be completed in a reasonable timeframe. Obtaining the GREM authorization and progressing on the path to drilling the target at Tierra Roja is Radius's primary near-term focus."
Sampling, Analytical Procedures and QA/QC
Rock and soil samples reported herein from the Tierra Roja core area were prepared and analyzed at Certimin S.A., an independent laboratory located in San Juan de Miraflores, Lima, Peru. Certimin is accredited to ISO/IEC 17025 by the International Accreditation Service (IAS TL-1051) and by Peru's Instituto Nacional de Calidad (INACAL-DA LE-022).
Multi-element analyses were performed by ICP-OES/MS following aqua-regia or multi-acid digestion. Gold was determined by fire assay (or equivalent) with an ICP or AAS finish. Elevated copper values were confirmed by additional total and sequential (soluble-copper) methods.
The dataset includes samples collected during multiple reconnaissance campaigns by previous operators and by Radius. Radius has reviewed the available historical assay certificates and associated laboratory quality-control results (certified reference materials, blanks and duplicates). These internal laboratory controls demonstrate acceptable accuracy and precision for the reported elements. Confirmation sampling completed by Radius is consistent with the copper and multi-element geochemical anomalies previously identified on the project.
As exploration advances, Radius will continue to apply industry-standard sampling, preparation, analytical and QA/QC protocols in accordance with National Instrument 43-101 requirements.
Qualified Person
Luke Longridge, PhD, P.Geo, is the President of Radius and is Radius's Qualified Person as defined by National Instrument 43-101 – Standards of Disclosure for Mineral Projects. Dr. Longridge has reviewed and approved the technical information contained in this news release.
About Radius Gold Inc.
Radius Gold Inc. is an exploration company focused on the discovery and advancement of high-quality projects in the Americas. The Company's strategy is to identify, acquire and advance exploration opportunities with strong discovery potential.
ON BEHALF OF THE BOARD
Simon Ridgway
CEO and Chairman
Radius Gold Inc.
1111 Melville Street, Suite 1000
Vancouver, BC V6E 3V6, Canada
Tel: 604-801-5432; Toll free 1-888-627-9378; Fax: 604-662-8829
Email: info@goldgroup.com
Website: www.radiusgold.com
Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.
Forward-looking statements
Certain statements contained in this news release constitute forward-looking statements within the meaning of Canadian securities legislation. All statements included herein, other than statements of historical fact, are forward- looking statements and include, without limitation, statements about the Company's exploration plans for its Tierra Roja property. Often, but not always, these forward looking statements can be identified by the use of words such as "estimate", "estimates", "estimated", "potential", "open", "future", "assumed", "projected", "used", "detailed", "has been", "gain", "upgraded", "offset", "limited", "contained", "reflecting", "containing", "remaining", "to be", "periodically", or statements that events, "could" or "should" occur or be achieved and similar expressions, including negative variations.
Forward-looking statements involve known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of the Company to be materially different from any results, performance or achievements expressed or implied by forward-looking statements. Such uncertainties and factors include, among others, whether the planned exploration work at the Company's Tierra Roja property will proceed as intended; changes in general economic conditions and financial markets; the Company or any joint venture partner not having the financial ability to meet its exploration and development goals; risks associated with the results of exploration and development activities, estimation of mineral resources and the geology, grade and continuity of mineral deposits; unanticipated costs and expenses; and such other risks detailed from time to time in the Company's quarterly and annual filings with securities regulators and available under the Company's profile on SEDAR+ at www.sedarplus.ca. Although the Company has attempted to identify important factors that could cause actual actions, events or results to differ materially from those described in forward-looking statements, there may be other factors that cause actions, events or results to differ from those anticipated, estimated or intended.
Forward-looking statements contained herein are based on the assumptions, beliefs, expectations and opinions of management, including but not limited to: that the Company's stated goals and the planned exploration and development activities at its properties will be achieved; that there will be no material adverse change affecting the Company or its properties; and such other assumptions as set out herein. Forward-looking statements are made as of the date hereof and the Company disclaims any obligation to update any forward-looking statements, whether as a result of new information, future events or results or otherwise, except as required by law. There can be no assurance that forward-looking statements will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, investors should not place undue reliance on forward-looking statements.
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