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Satellite photos of Tarkwa, Western Region, Ghana, from 1986 to 2015, depicting rapid gold mining development

(A) December 1986; (B) January 2002; and (C) January 2015. (Source: Images from Google Earth [2015]. Rajaee M, Obiri S, Green A, et al. Integrated assessment of artisanal and small-scale gold mining in Ghana-part 2: natural sciences review. Int J Environ Res Public Health 2015;12[8]:8971-9011. Creative Commons Attribution 4.0 International [CC BY 4.0] license, creativecommons.org/licenses/by/4.0.)