Artificial lake expansion amplifies mercury pollution from gold mining.

Journal Article (Journal Article)

Artisanal and small-scale gold mining (ASGM) is the largest global source of anthropogenic mercury emissions. However, little is known about how effectively mercury released from ASGM is converted into the bioavailable form of methylmercury in ASGM-altered landscapes. Through examination of ASGM-impacted river basins in Peru, we show that lake area in heavily mined watersheds has increased by 670% between 1985 and 2018 and that lakes in this area convert mercury into methylmercury at net rates five to seven times greater than rivers. These results suggest that synergistic increases in lake area and mercury loading associated with ASGM are substantially increasing exposure risk for people and wildlife. Similarly, marked increases in lake area in other ASGM hot spots suggest that "hydroscape" (hydrological landscape) alteration is an important and previously unrecognized component of mercury risk from ASGM.

Full Text

Duke Authors

Cited Authors

  • Gerson, JR; Topp, SN; Vega, CM; Gardner, JR; Yang, X; Fernandez, LE; Bernhardt, ES; Pavelsky, TM

Published Date

  • November 2020

Published In

Volume / Issue

  • 6 / 48

Start / End Page

  • eabd4953 -

PubMed ID

  • 33246963

Pubmed Central ID

  • PMC7695464

Electronic International Standard Serial Number (EISSN)

  • 2375-2548

International Standard Serial Number (ISSN)

  • 2375-2548

Digital Object Identifier (DOI)

  • 10.1126/sciadv.abd4953

Language

  • eng