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Location: 25 Km W from Minacu, Brazil
Rua Pierre Julien Sabatier, Quadra 1, Lot 1. S/N Condomínio Vila SamaMinaçuBrazil76450-000
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Serra Verde is one of the largest ionic clay deposits in the world. The Serra Verde REEs occur in thick weathered saprolites containing REE bearing clays, which developed from leaching of the underlying Serra Dourada granite, which is the largest intrusion of the Goiás Tin Province. The intrusion is approximately 64 km long in the north south direction and varies between 3.5 and 12 km wide (mean 7.5 km) in the east west direction.Type of deposit: saprolite “ion adsorption-type”- REE mineralization.It is formed due to the weathering of REE-enriched source rocks, the liberation and mobilization of the “REEs ions” and their preferential adsorption onto the surfaces of clay minerals.The particularly significant about saprolite is “ion adsorption-type” REE mineralization, typically contains a high proportion of “HREE”.The REE typically occur in a six metre-deep layer of clay-bearing saprolite produced by the deep weathering of granite. Initial testing suggests that more than 50% of the REE bulk is sorbed on clay and can be recovered by a simple elution process.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:- Emplacement of the Pela Ema Tin granites (~1.8 Ga). This resulted in the formation of typical tinbearing greisen veins hosting monazite and xenotime.- Intrusion of an evolved alkaline (possibly carbonatite) complex at depth (~540 Ma).This caused potassium metasomatism (K-feldspar-biotite) with additional introduction or recrystallisation of monazite, xenotime and magnetite.- Lateritisation, possibly during the Miocene.A 30-35 metre thick lateritic weathering profile developed, resulting in the breakdown of feldspars to clay and the dissolution of REE-bearing minerals with reprecipitation in the saprolite ore zone. Colluvial accumulations of REE are also present.
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