The Serra Verde deposit in the Goiás Province of central Brazil is rich in recoverable rare earth elements (REE). We are developing a formation model for the deposit and investigating its potential for REE extraction.
The Serra Verde deposit has an inferred resource of 458 million metric tonnes at a grade of 0.098% total rare earths (May 2012, 43-101 compliant). Heavy rare earth elements (HREE) account for 24% of the deposit.
The REE occur in a typically 6m-deep layer of clay-bearing saprolite produced by the deep weathering of granite. Initial testing suggests that more than 50% of the REE bulk are sorbed on clay and can be recovered by a simple elution process.
The Serra Verde project will develop a model for the introduction, enrichment and mineralogical residence of REE at the Serra Verde deposit. We aim to:
Serra Verde Mining are supporting a PhD project undertaken by Carmen Pinto-Ward, co-hosted at the Museum and Imperial College. Contact email@example.com for details.
The Serra Verde REE deposit is associated with a Proterozoic alkali granite within the Goiás province of Brazil. The REE introduction and enrichment may be related to three main stages of geological evolution:
A 30-35m-thick lateritic weathering profile developed, resulting in breakdown of feldspars to clay and dissolution of REE-bearing minerals with reprecipitation in the saprolite ore zone. Colluvial accumulations of REE are also present.