CXB Calibre Mining Corp

Calibre Mining Corp. (TSX: CXB; OTCQX: CXBMF) (the “Company” or “Calibre”) is pleased to announce drill results from its 2024 resource conversion and expansion program within the Guapinol open pit area on the Company’s 176 km2 Eastern Borosi Mine Complex (“Eastern Borosi”) in northeastern Nicaragua. This prolific land package sits adjacent to a larger, 100%-owned, 7,281 km2 Atlantic Mineral Concession package which has high potential for the discovery of both epithermal gold-silver and porphyry copper-gold systems.

Gold highlights from the Eastern Borosi drill program

• 13.24 g/t Au over 5.8 metres Estimated True Width (“ETW”) including 18.52 g/t Au over 4.0 metres ETW in Hole GP-24-182;
• 9.24 g/t Au over 6.2 metres ETW including 17.45 g/t Au over 3.1 metres ETW in Hole GP-24-189;
• 11.62 g/t Au over 3.8 metres ETW including 22.36 g/t Au over 1.9 metres ETW in Hole GP-24-187;
• 9.25 g/t Au over 1.6 metres EW including 12.70 g/t Au over 1.1 metres ETW in Hole GP-24-179;
• 7.81 g/t Au over 8.6 metres ETW including 16.61 g/t Au over 3.7 metres ETW in Hole GP-24-181;
• 3.37 g/t Au over 2.9 metres ETW including 6.13 g/t Au over 1.4 metres ETW and 3.31 g/t Au over 7.3 metres ETW including 8.15 g/t Au over 1.6 metres ETW and 6.67 g/t Au over 0.8 metres ETW in Hole GP-24-178A; and
• 5.01 g/t Au over 4.5 metres ETW including 8.59 g/t Au over 2.5 metres ETW in Hole GP-24-186.

Note: Estimated True Widths for reported vein intercepts are based on 3D models of individual veins. Estimates are determined in cross-section by measuring the modelled vein thickness perpendicular to the vein margins and through the midpoint of the drill hole intercept. Percentage-based differences between individual ETWs and down-hole interval lengths will vary between drill holes depending on drill hole inclination, variations in vein strike and dip, and overall geometries of the different vein systems.

Darren Hall, President and Chief Executive Officer of Calibre, stated: “Today’s drill results from Eastern Borosi confirm that significant high-grade gold mineralization exists outside of the present deposit area surrounding the Guapinol operation, reinforcing the potential for mine life extension. These drill results build upon the high-grade gold mineralization results reported earlier this year (see News Release dated April 15, 2024) confirming the significant mineral endowment of the district as well as the high potential for discovery and resource expansion within the entire 176 km2 Eastern Borosi land package.”

Link 1 – FiguresLink 2 – Drilling Tables

Quality Assurance/Quality Control

Calibre maintains a Quality Assurance/Quality Control ("QA/QC") program for all its exploration projects using industry best practices. Key elements of the QA/QC program include verifiable chain of custody for samples, regular insertion of certified reference standards and blanks, and duplicate check assays. Drill core is halved and shipped in sealed bags to Bureau Veritas in Managua, Nicaragua, an independent analytical services provider with global certifications for Quality Management Systems ISO 9001:2008, Environmental Management: ISO14001 and Safety Management OH SAS 18001 and AS4801. Prior to analysis, samples are prepared at Veritas’s Managua facility and then shipped to its analytical facility in Vancouver, Canada. Gold analyses are routinely performed via fire assay/AA finish methods. For greater precision of high-grade material, samples assaying 10 g/t Au or higher are re-assayed by fire assay with a gravimetric finish. Analyses for silver and other elements of interest are performed via Induction Coupled Plasma (ICP).

Qualified Person

The scientific and technical information contained in this news release was approved by David Schonfeldt P.GEO, Calibre Mining’s Corporate Chief Geologist and a "Qualified Person" under National Instrument 43-101.

About Calibre

Calibre is a Canadian-listed, Americas focused, growing mid-tier gold producer with a strong pipeline of development and exploration opportunities across Newfoundland & Labrador in Canada, Nevada and Washington in the USA, and Nicaragua. Calibre is focused on delivering sustainable value for shareholders, local communities and all stakeholders through responsible operations and a disciplined approach to growth. With a strong balance sheet, a proven management team, strong operating cash flow, accretive development projects and district-scale exploration opportunities Calibre will unlock significant value.

ON BEHALF OF THE BOARD

“Darren Hall”

Darren Hall, President & Chief Executive Officer

For further information, please contact:

Ryan KingSVP Corporate Development & IRT: 604.628.1012E: calibre@calibremining.comW: www.calibremining.com

Calibre’s head office is located at Suite 1560, 200 Burrard St., Vancouver, British Columbia, V6C 3L6.

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The Toronto Stock Exchange has neither reviewed nor accepts responsibility for the adequacy or accuracy of this news release.

Cautionary Note Regarding Forward Looking Information

This news release includes certain "forward-looking information" and "forward-looking statements" (collectively "forward-looking statements") within the meaning of applicable Canadian securities legislation. All statements in this news release that address events or developments that we expect to occur in the future are forward-looking statements. Forward-looking statements are statements that are not historical facts and are identified by words such as "expect", "plan", "anticipate", "project", "target", "potential", "schedule", "forecast", "budget", "estimate", “assume”, "intend", “strategy”, “goal”, “objective”, “possible” or "believe" and similar expressions or their negative connotations, or that events or conditions "will", "would", "may", "could", "should" or "might" occur. Forward-looking statements necessarily involve assumptions, risks and uncertainties, certain of which are beyond Calibre's control. For a listing of risk factors applicable to the Company, please refer to Calibre's annual information form (“AIF”) for the year ended December 31, 2023, its management discussion and analysis for the year ended December 31, 2023 and other disclosure documents of the Company filed on the Company’s SEDAR+ profile at www.sedarplus.com.

Calibre's forward-looking statements are based on the applicable assumptions and factors management considers reasonable as of the date hereof, based on the information available to management at such time. Calibre does not assume any obligation to update forward-looking statements if circumstances or management's beliefs, expectations or opinions should change other than as required by applicable securities laws. There can be no assurance that forward-looking statements will prove to be accurate, and actual results, performance or achievements could differ materially from those expressed in, or implied by, these forward-looking statements. Accordingly, undue reliance should not be placed on forward-looking statements.