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. 2011 Apr 19;6(4):e18875.
doi: 10.1371/journal.pone.0018875.

Gold mining in the Peruvian Amazon: global prices, deforestation, and mercury imports

Affiliations

Gold mining in the Peruvian Amazon: global prices, deforestation, and mercury imports

Jennifer J Swenson et al. PLoS One. .

Abstract

Many factors such as poverty, ineffective institutions and environmental regulations may prevent developing countries from managing how natural resources are extracted to meet a strong market demand. Extraction for some resources has reached such proportions that evidence is measurable from space. We present recent evidence of the global demand for a single commodity and the ecosystem destruction resulting from commodity extraction, recorded by satellites for one of the most biodiverse areas of the world. We find that since 2003, recent mining deforestation in Madre de Dios, Peru is increasing nonlinearly alongside a constant annual rate of increase in international gold price (∼18%/yr). We detect that the new pattern of mining deforestation (1915 ha/year, 2006-2009) is outpacing that of nearby settlement deforestation. We show that gold price is linked with exponential increases in Peruvian national mercury imports over time (R(2) = 0.93, p = 0.04, 2003-2009). Given the past rates of increase we predict that mercury imports may more than double for 2011 (∼500 t/year). Virtually all of Peru's mercury imports are used in artisanal gold mining. Much of the mining increase is unregulated/artisanal in nature, lacking environmental impact analysis or miner education. As a result, large quantities of mercury are being released into the atmosphere, sediments and waterways. Other developing countries endowed with gold deposits are likely experiencing similar environmental destruction in response to recent record high gold prices. The increasing availability of satellite imagery ought to evoke further studies linking economic variables with land use and cover changes on the ground.

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Conflict of interest statement

Competing Interests: The authors have declared that no competing interests exist.

Figures

Figure 1
Figure 1. Study area, Department of Madre de Dios in Peru.
Mining areas denoted by “A”, for Guacamayo (Figure 2A), “B” Colorado-Puquiri (Figure 2B), and “C”, Huepetuhe. Shown with white box of immediate study area, national protected and community areas and their buffer zones, and topography.
Figure 2
Figure 2. Satellite images of recent mining activity (Landsat TM bands 5, 4, 3); A) Guacamayo (12°51′S, 70°00′W) along the IOH and (B) Colorado-Puquiri (12°44′S, 70°32′W) in the buffer zone of the Amarakaeri Communal Reserve.
Figure 3
Figure 3. Gold, deforestation, and mercury import increases over time.
International biweekly gold prices , forest conversion to mining area (Figure 2A and B) and annual mercury imports to Peru (Superintendencia Nacional de Aduanas del Perú [14], [9]). Mercury imports for 2009 were recorded to September and projected for last quarter. Gold price had risen to >$1400/oz at the time of this article's publication .

References

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