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The geochemical signature of rare-metal pegmatites in the Central Africa Region: Soils, plants, water and stream sediments in the Gatumba tin–tantalum mining district, Rwanda

Authors
Journal
Journal of Geochemical Exploration
0375-6742
Publisher
Elsevier
Identifiers
DOI: 10.1016/j.gexplo.2014.01.025
Keywords
  • Coltan Mining
  • Rare-Metal Pegmatites
  • Toxic Elements
  • Mining Impacts On The Environment
  • Geochemical Signature
Disciplines
  • Chemistry
  • Earth Science
  • Ecology
  • Geography

Abstract

Abstract We studied trace elements in soils, plants, water and stream sediments in the Gisuma–Kibilira catchment of the Gatumba area of western Rwanda which has a long tradition of artisanal to small-scale tin–tantalum mining from rare-metal pegmatites. The geochemical fingerprint of soil, plant, water (springs and surface water in dry and rainy seasons) and stream sediment samples reveals elevated concentrations of Li, Rb, Cr, and Cs, but low As and U abundances at or below the global average. Trace element contents of soils and most plant materials are below internationally accepted guideline values. All water samples analyzed meet the World Health Organization (WHO) drinking water guidelines, and the stream sediments are below critical values of Dutch environmental standards. These data provide a baseline for environmental impact studies for rare-metal mining projects in the Central Africa Region.

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