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Semarule
Rare Earths Project

Neodymium - Nd
Praseodymium - Pr
Dysprosium - Dy
Terbium - Tb

250 km2

Active

3 licences

The Semarule rare earths project hosts several sizeable mineralised syenite intrusions, one of which is exposed over a 5 x 3 km region.

The following Airborne Magnetic map shows these syenite intrusions, with solid lines indicating visible exposure, and the dash lines representing interpreted intrusive locations.

The Geology of Semarule Area

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 intrusive relationships are poorly understood, as is the age of the syenite itself. Analysis of the more mafic, mineral-rich 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.

Historic Exploration Work

Surprisingly, there has been very little historic exploration in the Semarule area. However, geological mapping dates back to 1958. A current research project by the Botswana Geoscience Institute (BGI) recently drilled two core holes, which are the only drill holes into the syenite. Eastport has also supported the Semarule syenite as a thesis topic.

Current Exploration Work

Surface rock sampling by Eastport has reported up to 5,097 ppm (0.51%) Total Rare Earth Oxides (TREO), whilst a subset of magnet LREE and HREE including neodymium, praseodymium, dysprosium, and terbium, has assayed up to 1,270 ppm.