Related by context. Frequent words. (Click for all words.) 57 Bentonite 55 naturally occurring mineral 53 fracking fluid 53 placer deposits 53 mill tailings 53 hydroxide 53 calcium sulfate 53 kaolinite 52 kerogen 52 wellfield 52 frac sand 52 fracturing fluids 52 feldspar 52 elemental sulfur 51 evaporation ponds 51 mineral 51 wellfields 51 iron oxides 51 sulfide minerals 51 Barnett Shale formation 51 coalbed methane wells 51 brines 51 Carbonate 50 Rhenium 50 geologic formations 50 groundwater aquifers 50 minerals 50 spodumene 50 frac fluid 50 uranium vanadium 50 dissolved solids 50 sub bituminous coal 50 sulfide 49 chlorinated solvents 49 PGEs 49 borate 49 silica sand 49 skarns 49 brine 49 Niobium 49 sludges 49 bentonite 49 Artillery Peak 49 salt domes 49 Bakken formation 49 Paradox Basin 49 Marmaton 49 Horizontal drilling 48 methane hydrate 48 colloid 48 benzene toluene 48 Uinta Basin 48 pounds U#O# 48 Chattanooga Shale 48 Coal seam 48 minable 48 sandstone reservoir 48 skarn mineralization 48 sulphide nickel 48 metamorphic rocks 48 igneous rock 48 Appalachian basin 48 electrowinning 48 potassium sulphate 48 samarium 48 carbonaceous 48 andesitic 48 adsorbent 48 mineral salts 48 alluvial deposits 48 sedimentary rock 47 Marcellus shale formation 47 cobalt nickel 47 Bakken Formation 47 Chromite 47 aromatic hydrocarbons 47 alluvial diamonds 47 Raton Basin 47 Hydrogen sulfide 47 monazite 47 biogenic 47 zeolite 47 kimberlitic 47 elemental mercury 47 marine sediments 47 tailings 47 mudstones 47 subsurface 47 calcareous 47 sulfides 46 peridotite 46 olivine 46 Geologically 46 manganese 46 potassium permanganate 46 embayment 46 mudstone 46 potassium hydroxide 46 manganese oxide 46 Alluvial 46 geological formations