International Tower Hill Mines Provides Progress Report on Antimony Metallurgy Study at the Livengood Gold Project

Executive Summary

• International Tower Hill Mines reported encouraging preliminary results from the first phase of an antimony metallurgical study at its Livengood Gold Project.
• Four composite vein samples were tested, showing that antimony is hosted in stibnite that is readily liberable at the existing grind size and is largely floatable (>10 µm).
• The company will advance to the next test‑work phase to evaluate flotation flowsheets and concentrate characteristics at SGS Vancouver and SGS Lakefield.

Key Details

• Samples Tested: Four composites (SB12, SB24, SB40, SB46) with gold grades ranging from 3.21 g/t to 4.19 g/t and antimony contents from 1.05 % to 2.75 %.
• Grinding: Material milled to p80 = 250 µm (same as used in the 2023 technical report for gold reserve optimization).
• Mineralogy Findings: Antimony is carried by massive stibnite; most stibnite particles are >10 µm, indicating good floatability and liberation at the current grind size.
• Implication: Preliminary data suggest the antimony-bearing material could respond well to flotation, justifying further flowsheet testing.
• Next Steps: Immediate commencement of Phase 2 test work (flotation trials, concentrate evaluation) at SGS Vancouver and SGS Lakefield.
• Caveats: Results are preliminary; additional metallurgical work is required before any economic assessment or resource estimate for antimony can be made.

Notable Quotes

“These results warrant continuation into the next phase of the test work to assess potential flowsheets, to evaluate how the samples respond to flotation, and to determine what the characteristics of any concentrate obtained might be.” – Karl L. Hanneman, Chief Executive Officer

Materiality Assessment: Non‑Material – Positive (the update provides operational insight but does not yet indicate a material impact on the company’s financial position or resource estimates).