Article citationsMore>>

Carretier, S., Tolorza, V., Rodríguez, M.P., Pepin, E., Aguilar, G., Regard, V., Martinod, J., Riquelme, R., Bonnet, S., Brichau, S., Hérail, G., Pinto, L., Farías, M., Charrier, R. and Guyot, J.L. (2014) Erosion in the Chilean Andes between 27°S and 39°S: Tectonic, Climatic and Geomorphic Control. In: Sepúlveda, S.A., Giambiagi, L.B., Moreiras, S.M., Pinto, L., Tunik, M., Hoke, G.D. and Farías, M., Eds., Geodynamic Processes in the Andes of Central Chile and Argentina, Geological Society, Special Publication, London, 399, 401-418.
https://doi.org/10.1144/SP399.16

has been cited by the following article:

• TITLE: Exploratory Potential for Gold Placer Deposits in the Coastal Range, BioBío Region, South-Central Chile

  AUTHORS: Fredy Stange, Sonia Helle, Santiago Collao

  KEYWORDS: Gold, Placer, Exploration, Coastal Range, South-Central Chile

  JOURNAL NAME: International Journal of Geosciences, Vol.9 No.11, November 12, 2018

  ABSTRACT: Many gold placers located in the Coastal Range of south-central Chile have been exploited commercially during the past decades; nevertheless and until now, there are not any exploration studies of these placers and their basement. In order to provide an overview of exploratory potential, the stream sediments that are part of several gold placers in the northwest area of the BioBío region are analyzed, which have been registered on the basis of empirical evidence from artisanal mining activities. The overview consists of two goals: 1) determine the presence of auriferous occurrences (stream sediments and basement) and 2) identify potentially favorable areas to find gold placer deposits. Through optical microscopy this study characterized the metallic and non-metallic mineralogy of the basement, along with geochemical analyses of stream sediments and surrounding rocks of the placer deposits. The geochemical results show two sectors with high precious metal contents in sediments (up to 24 ppm of Au and 8 ppm of Ag) and two rocky outcrops with Au (757 and 41 ppb). Additionally, there are depressions in the study area that have received large amounts of sediments (reaching up to 170 m-thick), which are favorable places for the accumulation of auriferous sediments from nearby valleys due to the tectonic and structural conditions where they are located. Then, these results show an exploratory potential for gold placers and can be useful to delineate future exploration strategies in the Coastal Range of south-central Chile.