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Location: 85 km NE from Porto, Portugal
Rua 5 de Outubro nº 26BoticasPortugal5460-304
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The Barroso – Alvão Region is characterized by the presence of a large field of several dozen pegmatite and aplite-pegmatite dykes of granitic composition. Pegmatite dykes are mainly intruded in the granitic rocks of the region whilst aplite-pegmatite dykes are hosted by low- to medium-grade metasedimentary rocks of Silurian age that are strongly deformed (B. CHAROY et al.,1992). The thickness of these dykes ranges from less than 1m up to 50m.At the Barroso Lithium Project, lithium mineralisation occurs predominantly in the form of spodumene-bearing pegmatites, which are hosted in metapelitic and mica schists, and occasionally carbonate schists of upper Ordovician to lower Devonian age. The resource is comprised of five main deposits, Grandao, Reservatorio, Pinheiro, NOA and Aldeia.Grandao Deposit: Is the primary deposit of the Project with a mineralised zone of 650m long and 500m wide, and a thickness of up to 50m. The deposit exhibited consistency of mineralisation within the pegmatite body and has produced the most significant results to date. Reservatorio: Is a moderately dipping outcropping pegmatite with over 450m of strike exposure that can be traced for at least 170m down dip. The pegmatite thickness is up to 40m and has exhibited consistent lithium mineralisation throughout the body. The Reservatorio deposit comprises one main pegmatite which showed relatively clear geometry, and was modelled into a continuous, tabular shape. It strikes broadly NE-SW and dips to the NW at 25° to 40° and varies in thickness from 20m to 50m. Two minor parallel pegmatites have also been interpreted. A weathering boundary representing the top of fresh rock was also interpreted (using drill hole logging codes) as a shallow zone of weak to moderate weathering was noted. The main pegmatite zone remains open along strike to the north and down dip.The weathering profile comprises a shallow, surficial zone of weak to moderate oxidation, particularly of the schistose country rock with moderate oxidation to a depth of up to 20m.The Reservatorio main pegmatite has a drilled extent of 490m along strike and 200m down dip. The thickness of the mineralisation ranges from 10m to 50m.Pinheiro: is made up of two converging steeply dipping pegmatite bodies that have been traced for 200m on the surface and by drilling and down dip for 150m, with thickness up to 25m. Lithium mineralisation occurs throughout both pegmatites and remains open along both strike and down dip. NOA: is a semi contiguous, moderately dipping pegmatite body that has been traced for 350m along strike and down dip for 140m. The lithium mineralisation is consistent both down dip and along strike. Aldeia: is a northwest dipping tabular pegmatite with several minor subsidiary bodies that can be traced for 200m along strike and 250m down dip. The lithium mineralisation is consistent throughout the pegmatite and is of a higher grade compared to the other deposits.
