Adelong hammering Santa Rita do Aracuai field program follow-up

Adelong Gold Limited (ASX:ADG) is planning further work after completing its initial field reconnaissance program at its Santa Rita do Aracuai project in Lithium Valley, Minas Gerais, Brazil.

Detailed mapping will be undertaken in the central anomalous area and the area adjacent to Cachoeira do Norte of the project, where structural lineaments converge, quartz veins, kyanite and albite are present, and porphyroblasts of sillimanite and staurolite/cordierite occur.

Adelong says the aim is to identify the presence of pegmatitic bodies and/or further indications.

Stream sediment/float sampling in the same 2 areas will also be done with the objective of identifying lithium anomalies and/or indicator minerals.

The initial program was designed to provide an overview of the area’s geology to assist in targeting future work programs and has identified two key areas for further exploration.

Adelong Gold’s incoming Managing Director Ian Holland says the company is now refining its focus.

“Notably, the fieldwork has identified the highly prospective Salinas Formation, which hosts lithium-rich pegmatites elsewhere in the region. Focusing in, two key areas were identified which combine structural complexity with alteration/mineralogy suggestive of nearby intrusive bodies.

This provides the company with the ideal platform for the next phase of this exciting project.”

A geological assessment of the Leme Do Prado project located in Santa Rita do Aracuai, Brazil, has been recently completed, which included a 16-day field visit concentrating on initial mapping of the area’s geology and the search for occurrences of indicators of lithium mineralisation.

The Leme do Prado project area is located in the northern part of the Araçuaí Orogen, bordering the São Francisco Craton to the east, and developed during the Neoproterozoic era as part of the Brazilian-Pan African Orogenic System.

The primary geological units of the Araçuaí Orogen in the work area are the Neoproterozoic supracrustal associations of the Macaúbas Group and the Salinas Formation.

Generally, Adelong says the Araçuaí-Western Congo Orogen is identified by a set of geotectonic components that characterise a collisional orogen following an accretionary orogen along an active continental margin. It features elements like passive margin deposits, ophiolitic fragments, suture zones, magmatic arcs, syn-collisional granites, and post-collisional plutonism.

The metasedimentary units of the Araçuaí Orogen in the project area are represented by the distal passive margin metasediments of the Macaúbas Group and the metasediments of the Salinas Formation, deposited between the passive margin and a thrust front, with contributions from a magmatic arc.

The Salinas Formation is composed of banded quartz-mica schist, metagraywacke, mica schist, and graphite schist with frequent intercalations of paraderived calc-silicate rock, clast-supported metaconglomerate, and calcitic marble.

The metasedimentary rocks of the Salinas Formation generally exhibit metamorphic parageneses indicative of greenschist facies.

The portion of this unit that is in contact with the granitic bodies to the east of the area contains rocks with porphyroblasts of staurolite and fibrous sillimanite. The Salinas Formation is the main host rock for the mineralised pegmatites in the region.

Write to Adam Orlando at Mining.com.au

Images: Adelong
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Written By Adam Orlando
Mining.com.au Editor-in-Chief Adam Orlando has more than 20 years’ experience in the media having held senior roles at various publications, including as Asia-Pacific Sector Head (Mining) at global newswire Acuris (formerly Mergermarket). Orlando has worked in newsrooms around the world including Hong Kong, Singapore, London, and Sydney.