TTE262

Caracterización geológico-minera del depósito de magnetita en Playa Caleta la Barra…….

ABSTRACT

The present study focuses on the analysis of the magnetite deposit located on the beach of

Caleta La Barra, La Araucanía Region, Chile, with the aim of determining its origin,

formation, and potential economic value. A sampling methodology was implemented,

involving the collection of samples on the surface and at different depth levels, which were

prepared for detailed geochemical analyses (XRF, LIBS, and RAMAN).

The mineralogical characterization revealed that magnetite is the predominant component,

accompanied by minerals such as titanomagnetite, pyroxenes, and olivine. This mineral

composition shows similarities with the surrounding metamorphic basement, suggesting

that the deposit could have originated from the erosion and weathering of these rocks.

On-site observations and the interpretation of satellite images indicate the presence of

aeolian and fluvial processes in the study area. The relevance of a former arm of the Queule

River, which once flowed to the east of the deposit, is highlighted as it likely influenced its

genesis.

In terms of economic geology, a preliminary quantification of the deposit was conducted in

an area of 87.7 hectares, estimating an in-situ value of USD 978 million. However, it is

acknowledged that this figure is an approximation, and a more thorough analysis is

required, considering technical, economic, and environmental factors to determine the

actual feasibility of the deposit. Additionally, there is a suggestion for further elaboration

on the relative importance of aeolian and fluvial processes, the identification of potential

by-products, and a more detailed consideration of the associated costs of developing the

deposit.

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