The problem

Mercury is used to extract gold in simple mines in Ratankirri province, NE Cambodia. The gold amalgam is heated with an open flame to volatilize mercury and recover gold, resulting in the release of mercury.

Health Impact

This process has caused elevated mercury levels in the hair of gold workers. Fifty kilometers downstream hair levels of villagers were signiicantly higher than the average gold worker and above levels associated with the first signs of mercury poisoning. Fifty kilometers downstream, mercury in large predator fish was as high as 400 ng/g. Furthermore, artisanal gold mining results in about one third of atmospheric mercury pollution making it a global concern.

Current Activity

Hair samples were collected and analyzed from miners at the site as well as a village approximately 6.1 km from the mine. One model retort was made in Canada for local craftsmen in Cambodia. The model was constructed from kitchenware utensils that originated from China. The cost of the retort in Banlung, including labor was $10.50. Mercury was effectively trapped in the retorts. Retort training was given at the mine site and demonstrations were also given to the local Ministry of Environment and craftsmen in Banlung. Presentations were also given in Phnom Penh to the Ministry of Environment, Ministry of Fisheries, Plan International, and Rotary Club.

Outcome

Successful introduction of simple retorts to recycle mercury at the Prey Meas goldmine. Retorts were made in the area and local craftsmen were trained to make and use them. Blacksmith also measured severe bacterial contamination in the community drinkingwater well and provided a ceramic water filter that removes all bacteria.

Want To Learn More?

• Prey Meas Goldmine Report