Mt. Diwalwal

Location:

Compostela Valley, Philippines

Region:

Southeast Asia,

Pollutants:

Mining

Source:

Mining

Transmission:

air, water, soil

Potentially affected people:

40,000

The problem

Mt. Diwalwal is located in the Southeastern region of the Philippines. In 1982, the discovery of gold on this mountain triggered a gold rush to an area of 729 hectares. In the opinion of the Department of Environment and Natural Resources (DENR), it is ‘the largest gold deposit in the world’. An estimated $1.8 billion worth of gold reserves remain untapped in the 5,000-hectare mountain where some 30,000 small-scale miners operate, many illegally. The Naboc and Agusan rivers are grossly contaminated with mercury and cyanide from mining operations.

Health Impact

An op-ed item in September 2001 mentioned a research finding saying that 86% of the miners in Diwalwal were contaminated with mercury. A study conducted by the University of Philippines and the Philippine General Hospital found 36% of the residents of Diwalwal had dangerous levels of mercury in their bodies. Another study by the Department of Health, National Poison Control Information Service and Department of Health, Environment and Occupational Health found that mercury exposure from artisanal gold mining had resulted in blood mercury levels in workers exceeding WHO standards. Health effects included poor memory, anosmia, abnormal gait and balance.