Related by context. Frequent words. (Click for all words.) 78 leaching 64 leached 60 heap leach 59 leaches 58 heap leaching 58 tailings 54 sulfide 53 leach pad 51 testwork 50 sulphide 49 dewatering 49 mine tailings 48 tailings dam 48 dewatered 48 contaminate 48 alkali 47 percolation 47 saprolite 47 arsenic 47 ore 46 oxide 46 metallurgical testwork 46 smelting 45 cyanide 45 oxidize 45 tpd 45 manganese 45 sulfides 45 chlorides 45 zeolite 45 Tailings 44 contaminants 44 discolor 44 hydrometallurgical 44 solids 44 metallurgical testing 44 ores 44 zinc 44 effluent 43 oxidation 43 gravels 43 metallurgical 43 leachate 43 sulphate 43 sinter 43 organic solvents 43 oxide mineralization 43 brine 43 situ 43 Oxidation 42 hydrofluoric acid 42 oxidized 42 chemically treated 42 sediment 42 salts 42 seep 42 sulfuric acid 42 treated effluent 42 mill throughput 42 contaminated soils 42 electrolytic 41 slag 41 biodegrade 41 contaminant 41 gallium 41 suspended solids 41 decompose 41 feldspar 41 groundwater 41 sulfate 41 chlorination 41 remove impurities 41 slurry 40 syngas 40 glycol 40 corrode 40 harmful chemicals 40 membrane filtration 40 nitrate 40 toxicity 40 coal slurry 40 pyrolysis 40 sodium hydroxide 40 zinc mineralization 40 contaminates 40 nitrates 40 contaminated soil 40 ore mined 40 sediments 40 Nitrate 40 copper 40 crumb rubber 40 toxic chemicals 40 smelted 40 scoping study 40 sulphides 40 bismuth 39 dolomite 39 asbestos fibers 39 degrade 39 antimony