Related by context. Frequent words. (Click for all words.) 57 taconite 54 copper nickel 53 mining 53 PolyMet 52 Kennecott 52 mine tailings 51 Iron Range 49 uranium mining 49 sulfide 49 Pebble Mine 48 tailings 48 uranium mines 48 Hoyt Lakes 48 placer mining 47 nickel copper cobalt 47 Mesabi Nugget 47 gravel pits 47 Marcellus Shale drilling 47 fracking 47 geology 47 Mining 47 mine 47 iron ore mines 47 Tailings 47 coalbed methane 46 rock outcrops 46 chromite 46 copper zinc 46 mill tailings 46 Great Lakes Compact 46 mines 45 shoreland 45 pollute groundwater 45 limestone quarry 45 coal slurry 45 gravel pit 45 Ni Cu PGE 45 coal gasification 45 DNR 45 coal gasification plant 45 valley fills 45 Niobium 45 Taconite 45 Northern Dynasty 45 molybdenum 44 Alberta tar sands 44 wilderness designation 44 tar sands 44 coal mining 44 ore 44 hydrofracking 44 quarry 44 hydraulic fracturing 44 tailings ponds 44 niobium 44 gravel extraction 44 placer gold 44 mineral 44 Anticline 43 Canadian Malartic 43 Duluth Metals 43 heap leaching 43 mineralogy 43 Natural Resources 43 Environmental Quality DEQ 43 polymetallic 43 karst 43 barite 43 minerals 43 Fracking 43 glacial till 43 Donlin Creek 43 geologically 43 drilling 43 oil sands 43 sulfates 43 Uravan 43 fluorite 43 molybdenum deposit 43 limestone 43 headwaters 43 Pascua Lama 43 COGCC 42 sulfide mineralization 42 lakes 42 opencast 42 contaminated sediments 42 heap leach operation 42 CAFO 42 tailings pond 42 nickel sulphide 42 nickel copper 42 Keweenaw Bay 42 lakeshore 42 Rattlesnake Hills 42 volcanogenic massive sulphide VMS 42 quarries 42 uranium 42 manganese 42 Geologically 42 Upper Peninsula