Trigg Minerals (ASX:TMG) survey maps large-scale hydrothermal antimony system in Utah

Trigg Minerals has unveiled the results of a comprehensive Controlled-Source Audio Magnetotellurics (CSAMT) survey at its 100%-owned Antimony Canyon Project in Utah, identifying what it describes as a coherent, large-scale hydrothermal system.

The findings mark a step change in the company’s understanding of the subsurface architecture and provide a clear basis for drill targeting within one of the United States’ most underexplored antimony regions.

Highlights

• 43 kilometres of CSAMT data have defined multiple conductive zones coincident with historic workings across patented claims.

• 2D and 3D inversion modelling has revealed a continuous geophysical structure spanning roughly 3.4 km by 3 km.

• The system comprises a resistive silica cap overlying broad conductive alteration zones interpreted as argillic clays formed by hydrothermal outflow.

• Steep feeder structures identified as potential conduits for mineralising fluids intersect the conductive horizons, creating several high-confidence drill targets at depths of 50–150 metres.

• The results suggest the presence of a well-preserved hydrothermal system capable of hosting district-scale antimony mineralisation.

The survey, conducted by KLM Geoscience between August and September 2025, used 12 survey lines aligned near-perpendicular to the region’s dominant structural trend.

The CSAMT method measures subsurface resistivity variations to map hydrothermal alteration and mineralised systems.

The processed data revealed a striking geophysical pattern: a resistive silica-rich cap above conductive, clay-altered zones, disrupted by vertical structures interpreted as feeder faults.

Trigg Minerals Managing Director, Andre Booyzen, described the survey results as exceptional, noting that they

“did not just identify an anomaly” but successfully mapped “a complete, large-scale, and well-preserved hydrothermal system potentially bearing antimony mineralisation.”

This combination of structural and geochemical indicators supports the interpretation of a robust mineral system. The resistive silica cap, believed to have formed through deposition of silica from mineralising fluids, likely acted as a seal trapping hydrothermal fluids below.

The underlying conductive zones are associated with clay alteration, a known marker of mineralising outflow in antimony and other hydrothermal systems.

Of particular note is the identification of steeply dipping, resistive “feeder” zones that extend to depth and align closely with the historical Little Emma, Gem, and Emma lodes, where assays reached up to 14.47% antimony.

This strong spatial correlation reinforces confidence in the geophysical model and defines clear vectors for upcoming drill targeting.

The size of the anomaly, extending across more than three kilometres, confirms that the system is not an isolated occurrence but a district-scale feature.

The model indicates that the most prospective zones for mineralisation are likely to occur just beneath the resistive cap, on the flanks of the feeder structures, zones that will form the focus of the maiden drilling program.

Trigg’s exploration strategy in the United States reflects a broader shift toward securing critical minerals supply chains within Tier-1 jurisdictions.

The Antimony Canyon Project, alongside the company’s recently acquired Tennessee Mountain Tungsten Project in Nevada, places Trigg within a cohort of Australian explorers targeting U.S. critical minerals potential, supported by favourable state and federal frameworks.

With 3D modelling and drill planning now underway, the next phase will test the depth and tenor of the system identified by the CSAMT work.

The results could provide crucial insight into the potential for large-scale antimony mineralisation within a well-preserved hydrothermal environment in Utah’s Garfield County.

If validated by drilling, the Antimony Canyon system would represent a rare, intact example of a magmatically driven, structurally controlled hydrothermal network within a U.S. critical minerals context, aligning both geological promise and strategic significance.

Please note the following valuable information before using this website. 

Independent Research 

Market Open Australia is intended to be used only for educational and informative purposes, and any information on this website should not be taken as investment advice or guidance. It is important to conduct your own research before making any investment decisions, which should be based on your own investment needs and personal circumstances. Any investment decisions based on information contained on this website should be taken in line with independent financial advice from a qualified professional or should be independently researched and verified.