Mercury from gold minings in the Pantanal of Pocone (Mato Grosso, Brazil)

The Pocone gold minings are situated in the Bento Gomes River Basin, at the border of the Pantanal of Mato Grosso. Gold-bearing quartz veins are removed from the subsoils, milled with water, centrifuged and the heavier fraction is subsequently mixed with mercury for gold separation. The gold mining...

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Bibliographic Details
Published in:International journal of environmental health research 1997-09, Vol.7 (3), p.181-192
Main Authors: Nogueira, Flavia, Silva, Edinaldo Castro E., Junk, Wolfgang
Format: Article
Language:English
Subjects:
Freshwater
Gold Minings
Mercury
Tropical Wetlands
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Summary:The Pocone gold minings are situated in the Bento Gomes River Basin, at the border of the Pantanal of Mato Grosso. Gold-bearing quartz veins are removed from the subsoils, milled with water, centrifuged and the heavier fraction is subsequently mixed with mercury for gold separation. The gold mining activities caused a very intensive landscape change, threatening many environmental processes like sediment control and storage and recycling capacity of mercury. Cold Vapor Atomic Fluorescence System (CVAFS) was used to determinate total mercury in water, suspended material and sediments from Bento Gomes River, sampled monthly for 1 year. Apart from the fact that mercury concentrations are low in water and bottom sediments, they are slightly higher in relation to background levels measured in the area. The concentration in suspended material is also lower than other rivers with gold mining activities, but the floodplains of the Bento Gomes River act as mercury sinks. Therefore, the discharge of mercury into the Pantanal floodplain should be avoided, in spite of actual contamination of the system being very low.
ISSN:0960-3123
1369-1619
DOI:10.1080/09603129773823