Trigg Minerals (ASX:TMG) found a geophysical anomaly that corresponds to a widespread and potentially mineralized hydrothermal system at its Antimony Canyon project in Utah following a controlled-source audio magnetotelluric geophysical survey, according to a Tuesday filing with the Australian bourse.

The survey is designed to assess subsurface electrical resistivity to delineate the geological structure associated with known high-grade antimony mineralization in the project area, the filing said.

Modeling of the data showed key target zones at shallow depths, which will be tested in an upcoming drilling program scheduled by the end of the year, per the filing.

Shares fell 10% in afternoon trade on Tuesday.