Unfortunately, the sector relies heavily on mercury as a critical part of their gold extraction process. Mercury is added to ore to form a mercury-gold amalgam. This amalgam is then burned, causing the mercury to vaporize and leaving behind pure gold. While an effective process—one that has been in practice since at least 1000 CE— this type of mining leads to the direct exposure of miners to mercury, often with severe health impacts. ASGM is also responsible for the direct release of mercury into the environment and, according to the recently released Global Mercury Assessment 2013, small-scale gold mining is currently the largest human-caused source of mercury emissions. Additionally, ASGM drives a black market in mercury trade—check out Mark Staples’ blog on the illicit mercury trade to learn more about this.
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