Related by context. Frequent words. (Click for all words.) 64 leaching 64 leach 58 leaches 56 oxidized 56 leeched 53 sulfides 52 sulfide 50 seeped 50 oxidised 49 contaminates 48 seeps 47 extractable 47 mined 46 sulphides 46 oxidizes 46 seep 46 adsorbed 46 seeping 46 chalcocite 46 saprolite 45 acidic 45 sulphide 45 contaminate 45 extracted 45 sulphate 45 sediments 45 soluble 45 oxidize 45 alkali 45 contaminate groundwater 44 silica 44 chlorite 44 dewatered 44 carbonaceous 44 acidified 44 oxide 44 chromate 44 mg l 44 zinc mineralization 44 salts 44 diffuses 43 backfilled 43 gravels 43 carbonate 43 arsenic 43 contaminated 43 sulfate 43 feldspar 43 sediment 43 contaminants 43 contaminated soil 43 flowed 43 chemically treated 43 contaminated soils 43 trenched 43 melted 43 anomalous copper 43 brecciated 43 filtered 42 silicate 42 bornite 42 spilled 42 chloride 42 peridotite 42 sulphide ore 42 suspected carcinogen 42 overlies 42 evaporates 42 toxic 42 limestones 42 Grab samples 42 enriched 42 friable 42 disseminated sulphides 42 aqueous 42 mineralized interval 42 reabsorbed 42 metabolised 42 breccias 42 solvents 42 limonite 42 soils 42 silicified 42 harmful chemicals 41 decayed 41 organic solvents 41 dripped 41 iron oxides 41 detoxified 41 decomposes 41 nitrate 41 sulfuric 41 silicates 41 basalts 41 overlying 41 remove impurities 41 anomalous gold 41 residue 41 anomalous radioactivity 41 concentrations 41 contaminant