Gold mining in Ghana has a long history. Before the advent of the Biological Oxidation (BIOX) technology to extract, many mining companies extract and process gold through grinding, dissolution and precipitation of the free gold. Subsequent burning of the crude product releases oxides of sulfur and arsenic trioxide into the environment. The tailings are heaped, and also kept in dams. Because of these, it is hypothesized that, the mining of gold from Birimiam rock rich in arsenopyrite ore leads to the release of arsenic (As) and therefore could contaminate groundwater resources in and around the Obuasi Municipality