This book presents a combined analysis of the geochemical, physio-chemical, biological and analytical techniques to provide a better understanding of the biogeochemical cycling of heavy metals in ex-mining areas. The findings presented in this book provide a basis for evaluation of the environmental impacts of mining activities, especially tin mining. The chapters provide a general picture of the land use, geography, concentration and chemical speciation of heavy metals in mining areas. The impacts of bioavailable metal species are supported by a detailed case study on Bestari Jaya. The book concludes with remediation methods along with classical and modern approaches, their limitations and economic feasibility.