Chilwa Minerals (ASX:CHW) said assay results received for the first hole at the Mposa anomaly at the firm's critical minerals project in Malawi indicated up to 1,039 parts per million total rare earth oxide values in clay, sediments, and saprolite to depths of up to 80 meters, according to a Tuesday Australian bourse filing.

Initial drilling at the Mposa anomaly was completed, and sampling of a further five drill holes is ongoing.

Results from the initial drillhole at Mposa are being compiled to improve the overall understanding of the relationship between mineral sands and rare earth element targets on the license.