American Tungsten & Antimony (ASX:AT4) produced antimony ingot at the Del Sol Hydromet Refinery in Nevada using material from the White Spar Antimony Mine in Arizona, according to a Monday Australian bourse filing.

The company said the production demonstrates the mine-to-metal process across the White Spar and Del Sol assets proposed to be acquired by AT4.

Physical product samples enable AT4 to progress qualification activities and advance discussions with prospective offtakers, defense contractors and US government agencies, per the filing.

The company's shares rose 4% in recent Monday trade.