Yangibana Geology

The dominant lithologies in the tenement area are granites of the Durlacher Supersuite. Rafts of older sedimentary rocks occur within these intrusives.

The primary mineralisation targets within the Yangibana Project are narrow, discontinuously but regionally extensive outcropping ironstone dykes that carry anomalous rare earths associated with monazite mineralisation. The project also has the potential for as yet untested rare earths mineralisation associated with deeper carbonatite bodies.

Previous exploration at Yangibana has included reverse circulation drilling in the 1980s at a number of prominent targets, all now within Hastings’ current tenements, and on the basis of this drilling a non-JORC resource of 3.5 million tonnes at 1.63%TREO was estimated by a previous explorer. The vast majority of this resource lies in the near surface oxidised zone.

The ironstones are now considered to be a younger intrusive phase that has cut across slightly older ferrocarbonatite dykes, possibly leaching and upgrading rare earths (and base metals) from them. The carbonatite dykes themselves, along with the associated fenitic alteration, are considered to be sourced from an as yet undiscovered carbonatite intrusion which could potentially host significant rare earths and possibly base metals. Hastings tenements now total almost 650 sq km, covering the bulk of the Gifford Creek Carbonatite Complex.

Drilling by Hastings in 2014 and 2015 has led to the definition of JORC resources totalling 12.36 million tonnes at 1.07% TREO including 0.44% Nd2O3-Eq, confirming the unusually high ratio of Nd:TREO of the Yangibana mineralisation.

yangibana geology

Regional geology, Gifford Creek Ferro-Carbonatite Complex, showing main ironstone prospects