Sand mining effects, causes and concerns: A . - Academic JournalsMar 18, 2011 . Key words: Selangor river, water quality, sediment, transport, modelling. environment, illegal mining. INTRODUCTION. Sand mining is the.introduction to sand mining,sand mining - Three issues of sustainable management in the Ojos .Excessive instream sand-and-gravel mining causes the degradation of rivers. Instream mining lowers the stream bottom, which may lead to bank erosion.