Semarule
Rare Earths Project

Archaean Gaborone granite underlies the Semarule area and is host to the syenite intrusions. It is suggested that the Semarule syenite resulted from in situ metasomatism of the host granite, followed by intrusions of syenite. The syenites host the REE mineralisation, and analysis of the more mafic syenite intrusions consistently report elevated REE concentrations.

Mid-Proterozoic Kanye volcanic rocks lie unconformably on the basement granite, observed to the immediate north of the syenite intrusions. These volcanics are, in turn, overlain by the Ventersdorp, Transvaal, Waterberg, and younger Karoo sedimentary sequences.

Surface rock sampling by Eastport has reported up to 5,097 ppm (0.51%) Total Rare Earth Oxides (TREO) plus Yttrium Oxide (Y2O3), while a subset of magnetic light and heavy rare earth elements (LREE and HREE) including neodymium, praseodymium, dysprosium, and terbium, has assayed up to 1,270 ppm.

Surface rock sampling by Eastport returned consistent medium-high TREO results over the primary Semarule Syenite Hill target, with values reaching up to 5,097 ppm (0.51%) Total Rare Earth Oxides (TREO) plus Yttrium Oxide (Y2O3). Notably, approximately 25% of the TREO in each sample consists of high-value Magnetic Rare Earth Oxides (MREO), including neodymium, praseodymium, dysprosium, and terbium, which have assayed up to 1,270 ppm.

In addition, the results from the ‘River Prospecting’ to the southwest and grab sampling within the large southern covered intrusive returned promising results, generating additional areas of interest.