Southern Cross Gold Achieves Significant Metallurgical Development at Sunday Creek Gold-Antimony Project

Executive Summary

• Southern Cross Gold announced successful Stage 2 selective flotation testing at Sunday Creek, delivering a high‑grade antimony‑gold concentrate with low arsenic (<0.2% As) and overall gold recoveries of 92–96% across three product streams.
• Antimony recovery to concentrate ranges from 83.2% to 92.7%; antimony grades reach up to 53.1% Sb with gold concentrations as high as 93.2 g/t Au, de‑risking the project and supporting a multi‑product commercial strategy.
• The results enable scale‑up planning (locked‑cycle testing, pilot plant, process design) targeting Q1 2027, positioning Sunday Creek to supply premium antimony amid global export restrictions.

Key Details

• Selective Flotation Technology: Specialized collector chemistry separates stibnite from arsenopyrite/pyrite, achieving antimony concentrate As grades of 0.1‑0.2% (well below the 0.6% smelter threshold).
• Product Streams & Recoveries:
• Gravity gold concentrate – 37.3 – 51.4% Au recovery.
• Antimony‑gold concentrate – 28.8 – 36.5% Au recovery; Sb 48.2 – 53.1%; Au up to 93.2 g/t; Sb recovery 83.2 – 92.7%.
• Sulphide concentrate – 15.5 – 18.0% Au recovery.
• Overall Gold Recovery: 91.8 – 95.6% across all streams.
• Sample Base: 144 samples (66 from Apollo, 74 from Rising Sun). Key composites:
• AP02 – 46 kg @ 4.84 g/t Au, 1.33 % Sb, 0.17 % As.
• RS02 – 49 kg @ 5.83 g/t Au, 0.73 % Sb, 0.33 % As.
• Assay Results (Rougher‑Cleaner Concentrates):
• AP02 – 93.2 g/t Au, 53.1 % Sb, 0.14 % As.
• RS02 – 59.3 g/t Au, 48.2 % Sb, 0.16 % As.
• Mineral Composition of Concentrates: Stibnite 74.2 % (AP02) / 67.3 % (RS02); low arsenopyrite and pyrite; non‑sulphide gangue 17.7 %–26.8 %.
• Future Development Pathway: Locked‑cycle testing, multi‑stage cleaning, pilot‑plant trials, and full process plant design slated for completion Q1 2027.
• Strategic Context: Antimony is a critical metal; recent Chinese export limits and U.S. tariff exemptions enhance the project's market relevance.

Notable Quotes

“This significant metallurgical development significantly de‑risks our Sunday Creek project and positions us to potentially deliver multiple high‑value products to market.” – Michael Hudson, President & CEO
“We have demonstrated we can produce low‑arsenic antimony concentrates while maintaining excellent gold recovery across multiple product streams.” – Craig Brown, Metallurgical Consultant

Materiality: Material – Positive.