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Today I have read an article called "Mine Ponds Increase Risk for Mercury in the Peruvian Amazon." This article describes the growth of pits and ponds created in recent years by miners developing small alluvial gold deposits in the Peruvian Amazon, showing that this increases the risk of mercury exposure to indigenous peoples and wildlife.

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Taxes and royalties from mining account for 25% of its revenue. The bulk of the revenue is created by diamond mining, which made up 7.2% of the 9.5% that mining contributes to Namibia's GDP in 2011. Rich alluvial diamond deposits make Namibia a primary source for gem-quality diamonds.

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Alluvial Gold Mining. Alluvial gold is found beneath the surface at the bottom of a creak or stream. Alluvial gold mining is the process of extracting gold from these creaks, rivers and streams and is generally considered to be the most environmentally friendly method of gold mining as a result of the reduced environmental impact when compared to underground mining.

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The maximum-recorded thickness of the alluvial channel is 28 m however it varies significantly in both thickness and lateral extent (800 m to 1500 m). Mineralisation within the placer leads is in the form of ultrafine -5 um-alluvial gold slightly coarser heavy mineral also occurring generally between the -50 um and -150 um fraction.