St George Mining (ASX:SGQ) found thick, high-grade rare earths and niobium mineralization during a recent drilling at its Araxá rare earths and niobium project in Brazil, according to a Monday Australian bourse filing.

The results were up to 80.55 meters at 5.44% total rare earth oxides (TREO) and 0.60% niobium pentoxide from surface, including 32.3 meters at 9.13% TREO and 0.75% niobium pentoxide from surface.

The company said the results from three holes outside the envelope of the existing mineral resource estimate support a potential large expansion of the mineral resource estimate.

The company added that three holes were resource definition holes and support a potential high level of conversion of inferred resources in the estimate to the indicated category.

The company has submitted an additional 29 diamond drill holes to the laboratory with assays pending, and a further 40 diamond drill holes are planned in the current campaign with three diamond drill rigs on site.