BBX Minerals (ASX:BBX) shares rise as much as 15.4% to A$0.030, predicted for its best day since August 22, if these gains are consistent.

The mineral explorer announced receiving positive assay results from an ammonium sulphate leach test conducted in Brazil.

BBX reported that rare earth recoveries are comparable to typical Chinese ionic deposits.

The stock is at its highest level since September 25, however, the company’s stock was down 75% this year, based on last close.

BBX Minerals is a company involved in mineral exploration.