Groundwater Quality Study of Bauxite Mining Area, Bintan Land – Riau Islands Province

Abstract

The study area is located in the bauxite mining areas on the Bintan Land, Riau Islands Province. Geologically, the area consisted of pre-granitic rock such as clastic sedimentary rock of Triasic aged that consisted of shale and quartzite, granitic rock of jurasic aged that consisted of granite, granodiorite, aplit granite, granite-porphyry and rhyolite. These group of rock has intruded pre-granitic rock and caused hydrothermal procces and pneumatolitic contact as bauxite deposits origin rocks. It was known that the presence of Bauxite is associated with other elements. Because of its potentions, Bintan Land is also an catchment area that has potential as a source of clean water. So it will be very vulnerable to environmental pollution, especially pollution to the groundwater as a result of mining activities. It has become very important to environmentally assesment study due to its role of groundwater for society. The aims of study is to determined conditions of groundwater quality in bauxite mining area of Bintan Land based on chemical and physical data of groundwater taken in 3 wells located at midpoint to shoreline area. Based on laboratory analysis, it was found that sample of monitoring wells 1 and 2 declared as ineligible health, whereas in sample water of andesite mining still met with health requirements.