Rules for mineral prospecting and placer mining as of June ...
Jun 22, 2020· Update June 22, 2020: Prospectors do not require a National Pollution Discharge Elimination System (NPDES) permit from the Department of Ecology if: 1. Prospector uses motorized mineral prospecting equipment without discharging process water back to waters of the state (equipment is self contained); and, 2. The prospecting activity occurs only in certain waters in …