Marquee Resources (ASX:MQR) declared an inferred mineral resource estimate at its Western Australia-based Eastern Hills prospect of 1.1 million tonnes at 0.6% grade of antimony-equivalent for 6,800 tonnes of antimony-equivalent contained metal, according to a Friday Australian bourse filing.

The prospect is part of the Mt. Clement antimony-gold project. Antimony contributes 6,000 tonnes of contained metal, and around 83% of the antimony metal is contained within the open-pit component of the estimates, the filing said.

The firm also declared an exploration target of around 3 million to 6 million tonnes with antimony grades of around 0.4% to 0.8% at Eastern Hills.

Another 400 meters of potentially mineralized strike to the northeast of the mineral resource estimate will be tested in the upcoming second phase drilling program, which will consist of around 15 holes for 3,500 meters, per the filing.

The firm's shares fell past 15% in recent trading on Friday.