Felix Gold (ASX:FXG) found high-grade antimony mineralization at its Treasure Creek project's NW Array gold-antimony prospect in the US, according to a Tuesday Australian bourse filing.

The latest assays include 5.87 meters at 4.34% antimony from 54.08 meters, including two high-grade intervals up to 38% antimony.

The company said it has filed a permit amendment to its current exploration licence to obtain a bulk sample of approximately 1,600 tonnes targeting veins containing near pure stibnite.

The company added that engineering, resource estimation, environmental studies, and community outreach are ongoing, targeting the early first quarter of 2026 for submission of the permit for multi-year mining operations.

The results continue to support assessment of near-term antimony production targeting the fourth quarter of the year to the first quarter of 2026.

The company's shares fell 8% on market close.