Brightstar Resources (ASX:BTR) said metallurgical test work for the pre-feasibility study at its 2.9 million-ounce Sandstone gold project in Western Australia has delivered average gold recoveries of 94%, according to a Thursday Australian bourse filing.

The company said high recoveries were achieved across the deposits tested, including Two Mile Hill at 92% to 97%, Montague-Boulder at 90% to 99%, Whistler at 90% to 98%, Indomitable at 86% to 99%, Musketeer at 94% to 99%, Vanguard at 90% to 99% and Achilles at 73% to 95%.

The deposits tested represent about 80% of the Sandstone mineral resource, with results being incorporated into the PFS, which remains on track for delivery in the December quarter, the filing added.

The company's shares fell 1% in recent Thursday trade.