Copeland & Cobark Gold-Antimony

Targeting high-value gold and critical mineral antimony, these projects align with Trigg’s strategy to develop tier-one mineral assets within proven mineralised belts.

Historical Significance

The Copeland-Barrington Goldfield was a prolific producer in the late 19th and early 20th centuries, yielding an estimated 174,000 ounces of gold. Key mines include:

• Hidden Treasure produced 9,501 oz of gold from 5,039 tons of ore, averaging approximately 11.4 g/t Au, encountering wide auriferous veins to 3m.
• Mountain Maid produced 8,819 oz of gold from 1,892 tons, averaging approximately 145 g/t Au. Subsidiary workings also recorded outstanding grades:
  • No. 1 East: 2,766 oz from 674 tons — approx. 128 g/t Au
  • No. 2 East: 4,500 oz from 1,285 tons — approx. 109 g/t Au
• Centennial Reef produced 1,922 oz from 1,202 tons, averaging approximately 49.7 g/t Au. Additional outputs include:
  • No. 1 South: 1,334 oz from 625 tons — approx. 66.6 g/t Au
  • No. 2 South: 999 oz from 363 tons — approx. 85.5 g/t Au

Despite this, the field remains underexplored by modern methods, presenting a significant opportunity for discovery.

Geological Setting

The Copeland-Barrington Goldfield is characterised by narrow quartz reefs hosted within slaty and carbonaceous metasediments, likely part of the Carboniferous Tamworth Group. These rocks are tightly folded and often exhibit cleavage development, providing structural traps for mineralising fluids. The reefs typically strike north–south or ENE–WSW and range up to 3 metres in width.

Gold occurs predominantly as free gold within white to milky quartz veins, often accompanied by pyrite and, in some cases, stibnite (antimony sulphide), indicating a multi-phase mineralising system. Historical records describe well-defined reef structures, frequently enclosed by blue or grey slate walls, and sometimes hosted within broader zones of quartz veining and minor brecciation.

The mineralisation style is vein-hosted and structurally controlled, with economic shoots typically located within faulted or sheared zones. Historical production data reveal exceptionally high grades over narrow widths, suggesting an orogenic to shallow epizonal origin. The proximity of antimony-rich veins to gold reefs points to a possible zoned mineralising system or overprinting event involving late-stage Sb-bearing fluids.

Exploration Potential

Trigg Minerals is executing a modern, phased exploration strategy that includes geological mapping, rock chip and soil geochemistry, geophysics, and targeted drilling. With numerous historical workings left open at depth and along strike, the potential to define high-grade gold-antimony resources remains strong. The company is focused on unlocking these targets to support future development and establish a critical regional mineral footprint.