This project seeks to contribute to the reduction of occupational health hazards of small-scale gold miners in the Manica District of Mozambique by promoting the use of mercury retorts, while at the same time leading to overall reduction of environmental degradation in the region.

Manica is a district of Mozambique in the Manica Province with a population of 155,731 people. Manica District borders with the Republic of Zimbabwe in the west, the District of Gondola in the east, the District of Barué to the north through the Pungué River, and the District of Sussundenga in the south, which is bounded by the Revué and Zonué Rivers.

In the Manica District of Mozambique, more than 10,000 people are directly and indirectly involved in artisanal (small-scale) gold mining activities (garimpagem) as their main source of income. Most of “garimpeiros” (artisanal miners) use mercury to extract gold form the mineral ore; the amalgation process recovers very little of that mercury, which pollutes the nearby environment. The majority of the mercury used pollutes local waterways and soil as well as threatens the livelihood of plant and animal species in the area. Mercury amalgamation results in the discharge of an estimated 1000 tons of mercury per annum, representing about 30 percent of the world’s anthropogenic mercury releases.

The process of amalgamation transforms elemental mercury into methylmercury—one of the most toxic organic compound and a powerful neurotoxin that works its way up the food chain through bioaccumulation. According to the Ban Mercury Group, as much as 95 percent of all mercury used in small-scale gold mining is released into the environment, constituting a dangers on all fronts—economic, environmental and human health. It is estimated that over 13 million people work as artisanal miners worldwide

The Project aims to reduce occupational health and environmental hazards of artisanal (small-scale) gold mining communities in northern Guinea. The total population of the area covered by the project is estimated at 150,000 of which over 40,000 people are involved every year in gold mining activities. The unregulated burning of mercury amalgam is the primary method for gold extraction. It is widely reported that this method yields 1 kg of gold for every 1.3 kg of mercury employed.

Artisanal, or small scale gold mining (also called ASM) is one of the most significant sources of mercury release into the environment in the developing world, with at least a quarter of the world’s total gold supply coming from such sources. ASM miners combine mercury with gold-carrying silt. The gold and mercury combine to form an amalgam, making recovery of the gold easier. The amalgam is subsequently heated with blow torches or over an open flame so that the mercury burns off, and gold is left at a purity of 70 to 80 percent. The gaseous mercury is subsequently inhaled by the miners, or by their immediate family, including their children. Mercury which is not inhaled during the amalgamation process settles into the surrounding environment, or circulates globally at regional and global scales for future deposition far from the site, where it is absorbed and processed by a variety of living organisms. As a consequence of its misuse, mercury amalgamation results in the discharge of an estimated 1000 tons of mercury per annum which represents about 30% of the world’s anthropogenic mercury releases. It is estimated that between 10 and 15 million artisanal and small scale gold miners worldwide, including 4.5 million women and 600,000 children1. This process transforms elemental mercury into methylmercury. Methylmercury is one of the most toxic organic compounds and a powerful neurotoxin that works its way up the food chain through bioaccumulation. According to UNIDO, as much as 95 percent of all mercury used in ASM mining is released into the environment, constituting a danger on all fronts – economic, environmental and human health. There are a number of cleaner technology alternatives to current methods of mercury amalgamation. The use of retorts during the mercury burn-off stage is a simple and cost-effective way to decrease the occupational exposure to mercury and minimize its release into the environment. Retorts allow for the efficient capture and reuse of mercury. 1 Veiga, M.M., Baker, R. (2004). Protocols for Environmental and Health Assessment of Mercury Released by Artisanal and Small Scale Miners, Report to the Global Mercury Project: Removal of Barriers to Introduction of Cleaner Artisanal Gold Mining and Extraction Technologies, GEF/UNDP/UNIDO, 170p.

UNIDO estimates that mercury amalgamation from this kind of gold mining results in the release of an estimated 1,000 tons of mercury per year, which constitutes about 30 percent of the world’s anthropogenic mercury emissions. It is estimated that between 10 and 15 million artisanal and small-scale gold miners worldwide, including 4.5 million women and 600,000 children [1]. According to UNIDO, as much as 95 percent of all mercury used in artisanal gold mining is released into the environment, creating a danger on all fronts—economic, environmental and human health (2005). Covered by the 2008 World’s Worst Polluted Places Report, ASM still threatens today’s world environment and public health.