high sulphidation alteration

Related by string. * Highs . highs . higher . Higher : Jr.-Sr. High School . HIGH SCHOOL BOYS BASKETBALL . High Risk Warning . High Frequency Economics / : sulphidation epithermal gold . low sulphidation epithermal . sulphidation epithermal . sulphidation / Alterations . ALTERATION . Alteration . alterations : clay alteration . carbonate alteration . hydrothermal alteration indicative * *

Related by context. All words. (Click for frequent words.) 72 intrusive breccia 69 silicified breccias 69 coincident geophysical 69 potentially bulk mineable 69 metallogenic 69 stockwork vein 69 auriferous quartz 68 advanced argillic alteration 68 anomalous soil geochemistry 68 coincident magnetic 68 Cu Au mineralization 68 calc silicate 68 auriferous zones 68 chalcedonic 67 disseminated sulphide mineralization 67 Au Ag mineralization 67 mafic intrusive 67 lithologic 67 granodiorite intrusive 67 diorite porphyry 67 anomalous radiometric 67 northerly trending 67 felsic intrusive rocks 67 magnetic electromagnetic 67 sericite pyrite 67 mineralized outcrops 66 alteration assemblage 66 felsic rocks 66 Naciente Quebrada Pedregosa 66 anomalous geochemical 66 silica breccia 66 Alaskite 66 metavolcanic 66 quartz sulphide 66 variably altered 66 mineralized breccias 66 mineralized skarn 66 mineralized intrusive 66 IP induced polarization 66 carbonate altered 66 chlorite sericite 66 vuggy silica alteration 66 Detailed mapping 66 metasediment 66 vein breccias 66 vein stockwork 66 untested geophysical anomalies 66 Au Cu mineralization 66 phyllic 66 La Bodega zone 66 disseminated sulphide 66 REE bearing 66 EM conductors 66 vanadium mineralization 66 metasedimentary 66 epithermal alteration 66 ENE trending 66 diorites 66 Toro Gregorio 66 Geological mapping 66 quartz carbonate vein 65 shallowly dipping 65 iron carbonate alteration 65 auriferous 65 massive sulfide mineralization 65 dacite porphyry 65 andesitic volcanics 65 silicified shear zones 65 quartz carbonate veins 65 volcanogenic 65 jasperoid 65 norite 65 porphyry alteration 65 paleochannel 65 volcanic stratigraphy 65 Miwah Gold Zone 65 Banded Iron Formation 65 vein swarms 65 hydrothermally altered 65 propylitic alteration 65 stratabound 65 prospective stratigraphy 65 mineralized quartz veins 65 stockwork veins 65 WNW trending 65 favorable stratigraphy 65 granitoids 65 granodiorite porphyry 65 metavolcanics 65 quartz sericite 65 mafic volcanic rocks 65 rhyolite dome 65 banded quartz veins 65 mafic rocks 65 mineralized pegmatite 65 surface geochemical anomalies 65 sericite schist 65 massive sulphide lenses 65 stringer mineralization 65 chargeability resistivity 65 sulphidation 65 hydrothermal breccias 65 manganese mineralization 65 lithogeochemical 65 structurally controlled 65 arsenopyrite mineralization 65 electromagnetic conductors 64 structural stratigraphic 64 stockwork breccia 64 mafic intrusions 64 epithermal mineralization 64 ultramafic rock 64 biotite alteration 64 vuggy silica 64 felsic volcanic 64 volcanic breccias 64 structural lineaments 64 gossans 64 sheeted vein 64 epithermal veins 64 anomalous molybdenum values 64 gneissic 64 mesothermal gold 64 niobium mineralization 64 polymetallic mineralized 64 felsic volcanic rocks 64 ultrabasic 64 Sulphide mineralization 64 Malrok 64 garnet skarn 64 rhyolite porphyry 64 felsic volcanics 64 VTEM conductor 64 geochemical anomalies 64 pegmatite dykes 64 breccia mineralization 64 vuggy silica quartz alunite 64 quartz pyrite veins 64 mineralized breccia zone 64 northwest trending shear 64 coincident geochemical 64 arsenopyrite veins 64 diatreme breccias 64 shearing alteration 64 porphyritic 64 gabbroic intrusive 64 nickel sulphide mineralization 64 vein breccia 64 radiometrics 64 mafic metavolcanic rocks 64 graphitic conductors 64 Soil geochemical 64 metavolcanic rocks 64 magnetic lineament 64 stockwork mineralization 64 sulphide lenses 64 silica pyrite 64 northeast trending shear 64 porphyry Cu Au 64 mineralized lenses 64 sheeted quartz veinlets 64 hydrothermal alteration 64 rhyolites 64 outcropping quartz veins 64 advanced argillic 64 Uranium mineralization 64 PGM mineralization 64 pegmatitic 64 monzodiorite 64 extensive artisanal workings 64 kimberlite breccia 64 quartz vein stockwork 64 electromagnetic EM conductors 64 altered volcanic rocks 63 arsenopyrite bearing 63 Las Boquillas 63 volcano sedimentary 63 magnetite bearing 63 intense silicification 63 spodumene bearing 63 quartz chalcopyrite 63 bulk mineable 63 polymetallic veins 63 approximately #km# [002] 63 pyrite veins 63 narrow quartz veins 63 gold anomalism 63 ankerite 63 trending shear zone 63 Induced Polarisation 63 sericitic 63 gossanous 63 meta sedimentary rocks 63 Ni Cu PGE mineralization 63 massive sulphide deposits 63 rhyolite domes 63 altered silicified 63 Tortigny deposit 63 quartz tourmaline 63 sericite altered 63 stratigraphic horizon 63 airborne magnetic anomaly 63 felsic intrusives 63 granitic intrusions 63 altered felsic 63 felsic intrusive 63 chloritized 63 sulphosalts 63 breccia zones 63 skarn mineralization 63 quartz magnetite 63 meta sediments 63 sheeted veins 63 silicified rocks 63 pyrite halo 63 gabbro intrusive 63 epithermal precious metals 63 dike swarm 63 mafic ultramafic 63 phyllic alteration 63 artisanal workings 63 peridotites 63 EM conductor 63 epithermal vein 63 strongly silicified 63 siliceous breccia 63 mafic volcanic 63 geophysical conductors 63 volcaniclastics 63 diorite sill 63 quartz sericite pyrite 63 carbonate replacement 63 weakly mineralized 63 Tertiary volcanics 63 surface geochemical sampling 63 anomalism 63 mineralized stockwork 63 copper molybdenum mineralization 63 intermediate sulphidation 63 alteration zones 63 mafic intrusion 63 alaskite 63 Cobrecon 63 potassic altered 63 copper porphyry mineralization 63 tonalite 63 supergene enriched 63 propylitic 63 quartz veined 63 Volcanogenic Massive Sulphide VMS 63 radiometric anomaly 63 anomalous Au 63 en echelon 63 mineralized gabbro 63 resistivity geophysical 63 poly metallic mineralization 63 tuffaceous 63 EM anomalies 63 argillic 63 Cretaceous sandstones 63 hydrothermal breccia 63 sulfide mineralization 63 VTEM conductors 63 granitic gneiss 63 pyrite chalcopyrite 63 lithological units 63 Hangingwall 63 mineralization encountered 63 Matoush fault 63 porphyry intrusions 63 Cordero Porphyry 63 orogenic gold 63 mineralized horizons 63 stockwork veining 63 Taricori 62 sulfide bearing 62 sericite carbonate 62 magnetite skarn 62 quartz stockworks 62 mineralized breccia 62 Detailed geological mapping 62 NNW trending 62 aeromagnetic anomalies 62 IP chargeability anomalies 62 disseminated mineralization 62 conductive anomalies 62 polymetallic vein 62 massive sulphide zones 62 soil geochemical survey 62 deformation corridor 62 surface geochemistry 62 feldspar porphyry 62 mineralized occurrences 62 quartz monzonite intrusion 62 IOCG mineralization 62 volcanogenic massive sulphide VMS 62 quartz pyrite 62 peralkaline 62 ultramafic intrusion 62 carbonate veins 62 altered rhyolite 62 Sudbury Breccia 62 quartz porphyry 62 pyrite stringers 62 subvolcanic 62 pyrite altered 62 uranium anomalism 62 outcrop exposures 62 quartz chlorite 62 meta sedimentary 62 Luhwaika 62 alteration halo 62 lithological contacts 62 layered mafic 62 NNE trending 62 Tertiary volcanic rocks 62 intense hydrothermal alteration 62 quartz breccias 62 exhalative 62 lapilli tuff 62 andesitic rocks 62 bulk tonnage mineralization 62 sylvinite 62 mafic intrusives 62 andesitic 62 Fofina 62 vein stockworks 62 conductive zones 62 NE trending 62 formation BIF 62 outcropping mineralization 62 mineralized quartz vein 62 sheared mafic volcanic rocks 62 Induced Polarization IP chargeability 62 silicic alteration 62 untested geophysical 62 ground magnetics 62 pyritized 62 sheeted quartz 62 secondary biotite 62 kimberlite dyke 62 Paleozoic sedimentary rocks 62 soil geochemical sampling 62 feldspar porphyry intrusive 62 mafic volcanics 62 bulk mineable gold 62 kimberlitic 62 quartz sulphide veins 62 gabbroic 62 quartz feldspar porphyries 62 ultramafic sill 62 potassic alteration 62 stratigraphically controlled 62 epithermal quartz veins 62 IP chargeability anomaly 62 mineralized outcrop 62 amphibolite 62 resistivity anomaly 62 geochemically anomalous 62 high sulphidation 62 breccia textures 62 argillic alteration 62 geophysical anomaly 62 dravite 62 veinlet 62 paleo placer 62 palaeochannel 62 mineralizations 62 magnetite mineralization 62 stream sediment geochemical 62 Carbonatite Complex 62 felsic dikes 62 ultramafics 62 diatreme 62 induced polarization anomalies 62 stratiform 62 northerly trending structures 62 massive sulphide horizons 62 galena sphalerite 62 Roughrider East 62 Cordero Porphyry Belt 62 anomalous mineralization 62 quartz sericite alteration 62 Nose Deposit 62 volcano sedimentary belt 62 tonalitic 62 granitic intrusive 62 dacitic 62 stockworks 62 quartz sulphide vein 62 ultramafic intrusive 62 EW trending 62 chlorite pyrite 62 potassically altered 62 silicified zone 62 anomalous geochemistry 62 VTEM anomaly 62 lithology 62 Cerro Moly 62 antimony mineralization 62 porphyry style 62 porphyry mineralization 62 volcanic massive sulphide 62 bearing sulphide mineralization 62 geophysical signatures 62 plutonic rocks 62 mineralized vein 62 quartz sericite pyrite alteration 62 porphyry intrusives 62 andesitic flows 62 quartz hematite 61 magnetite alteration 61 Permo Carboniferous 61 quartz monzonite porphyry 61 brecciated zones 61 syenite porphyry 61 sulphide bearing 61 felsic dykes 61 Breccia Zone 61 volcaniclastic 61 banded quartz 61 pyrite arsenopyrite 61 syenite 61 epithermal silver 61 dyke swarm 61 gold copper porphyry 61 pegmatites 61 mineralized corridor 61 pyroxenites 61 volcanic sedimentary 61 sphalerite galena 61 airborne magnetic 61 Yaxtché deposit 61 mineral assemblages 61 porphyry intrusion 61 mylonite 61 metasedimentary rocks 61 epithermal quartz 61 quartz vein zones 61 hydrothermal alteration zones 61 easterly trending 61 silicified limestone 61 Bracemac Zone 61 silicified porphyry 61 copper molybdenum porphyry 61 massive sulphide mineralization 61 mineralising 61 dunite 61 tectonic breccia 61 felsic tuffs 61 porphyritic intrusive rocks 61 Miocene aged 61 termite mound sampling 61 mineralized porphyry 61 specular hematite 61 resistivity anomalies 61 La Mascota zone 61 reconnaissance mapping 61 volcano sedimentary sequence 61 Birimian metasediments 61 airborne radiometric anomalies 61 IP geophysical anomaly 61 hematitic 61 volcaniclastic rocks 61 uraniferous boulders 61 unconformity type 61 VTEM anomalies 61 bulk minable 61 chemical metasedimentary rocks 61 lithocap 61 quartz stockwork 61 stockwork veined 61 surface bulk tonnage 61 epithermal gold mineralization 61 mineralized shear zone 61 porphyritic intrusive 61 variogram 61 intersected mineralized 61 wallrocks 61 Rusk Zone 61 granitoid bodies 61 silicified breccia 61 graphitic sediments 61 low sulphidation 61 Athabasca unconformity 61 previously unsampled 61 breccia veins 61 stockwork zones 61 brecciated silicified 61 Aricheng West 61 Porcupine Destor Fault 61 soil geochemical surveys 61 gold mineralization intersected 61 abundant pyrite 61 dyke swarms 61 Destor Porcupine fault 61 actinolite 61 gravity anomalies 61 anomalous zones 61 pyrite alteration 61 Ni Cu PGM mineralization 61 sericite alteration 61 stratigraphic interval 61 Fobiri 61 rhyolite tuffs 61 anomalous zinc 61 Piaba deposit 61 airborne EM 61 Pyrrhotite 61 hematite mineralization 61 porphyry intrusive 61 anomalous molybdenum 61 diorite intrusion 61 gold mineralizing 61 mineralized quartz 61 quartz muscovite 61 pelitic 61 conductivity anomalies 61 Archean aged 61 chargeability anomalies 61 geophysical conductor 61 quartz breccia 61 Korkan target 61 Mineralization occurs 61 ignimbrite 61 sulfide veins 61 quartz tourmaline veins 61 Okohongo target 61 quartz monzonite 61 Enzyme Leach soil 61 copper mineralization intersected 61 molybdenite mineralization 61 Lac Cinquante deposit 61 airborne geophysical anomalies 61 Encanto Zone 61 supergene enrichment 61 grade bulk mineable 61 albite alteration 61 polymetallic sulphide 61 Proterozoic age 61 geochemical signature 61 molybdenite occurs 61 Fayolle Deposit 61 Kambalda style 61 copper skarn 61 strongly altered felsic 61 calcrete sampling 61 lithological 61 porphyry Cu 61 meter spacing 61 amphibolites 61 Mankarga 5 61 polymetallic mineralization 61 felsic dyke 61 Zam Zam Shenkman 61 enzyme leach 61 footwall zones 61 sericitic alteration 61 quartz diorite 61 parallel shear zones 61 carbonate vein 61 Rojo Grande 61 synvolcanic 61 bedrock conductors 61 Porcupine Destor fault 61 felsic porphyry 61 pyrite marcasite 61 west trending shear 61 Cambrian Ordovician 61 silicic 61 arsenopyrite pyrite 60 quartz stockwork zone 60 paragneiss 60 EM geophysical survey 60 low sulphidation epithermal 60 pyrrhotite pyrite 60 hole CJV 60 felsic 60 Geologic mapping 60 Shoreline Basalt 60 Mineralized zones 60 silicification quartz 60 Dienemera 60 Induced Polarization anomaly 60 granodiorites 60 sulphide mineralized 60 mineralized envelopes 60 banded iron 60 syenitic 60 resistivity lows 60 sulphide veins 60 anomalous chargeability 60 Archaean greenstone 60 calc silicate rocks 60 illite 60 Harena 60 bearing quartz veins 60 magnetometry 60 granitic pegmatite 60 soil geochemical anomalies 60 sericitized 60 mineralized shear zones 60 mafic intrusive rocks 60 La Cumbre porphyry 60 Dubenski shear 60 anastomosing 60 soil geochemical 60 ODAE 60 anomalous arsenic 60 argillaceous 60 ANIT 60 surface outcrops 60 Klaza Zone 60 Upper Bracemac 60 disseminated sulfide 60 rhyodacite 60 mineralized zones intersected 60 porphyries 60 mineralized felsic 60 pelite 60 granitic rocks 60 #WR# 60 deformation zone 60 Fayolle deposit 60 pervasively silicified 60 surface trenching 60 Calandria Sur 60 jasperoids 60 stockwork zone 60 quartz calcite veining 60 ultramafic rocks 60 bearing breccias 60 chalcopyrite bornite 60 VTEM geophysical 60 sulfosalts 60 albitite 60 massive pyrrhotite 60 magnetic lineaments 60 stockwork 60 secondary chalcocite 60 trending mineralized 60 anomalous concentrations 60 steeply dipping fault 60 Artavasdes 60 aeromagnetic data 60 Junnagunna 60 volcanic breccia 60 El Compas 60 pyrite sphalerite 60 chloritic 60 silicified zones 60 bearing quartz vein 60 sulphides pyrite 60 VTEM surveys 60 Black Thor chromite 60 magnetic anomalies 60 unmineralized 60 Thor Trend 60 magnetite pyrite 60 IP geophysical anomalies 60 alkalic 60 volcanogenic massive sulfide 60 geochemically 60 mafic ultramafic rocks 60 Ultramafic 60 coincident gravity 60 andesite porphyry 60 Molybdenum mineralization 60 Grota Seca 60 quartz carbonate 60 calcrete 60 Pegmatite Zone 60 Ouro Verde deposit 60 arcuate 60 manto mineralization 60 quartzites 60 geologically mapped 60 anomaly coincident 60 REE mineralized 60 shear veins 60 bearing quartz carbonate 60 foliation 60 volcanogenic massive sulphide 60 hypabyssal kimberlite 60 Mt Penck 60 propylitic altered 60 altered volcanics 60 diatreme breccia 60 Madera Veins 60 diabase 60 calc alkaline 60 soil geochemical anomaly 60 granitic rock 60 airborne anomalies 60 andesitic volcanic 60 subparallel 60 coincident anomalous 60 granitic pluton 60 structural lineament 60 airborne magnetics 60 supergene mineralization 60 tholeiitic 60 IP geophysical surveys 60 electromagnetic anomalies 60 Nueva Concepcion 60 altered diorite 60 hydrothermal brecciation 60 rhyolite breccia 60 Yaxtché zone 60 mineralized horizon 60 ultramafic volcanics 60 quartz adularia 60 quartz lode 60 hydrothermal uranium 60 Calandria Norte 60 Extension Occurrence 60 quartz feldspar porphyry 60 DDH# [001] 60 MR# #C 60 Geophysical surveys 60 magnetite hematite 60 induced polarization surveys 60 calcareous sandstone 60 gabbroic rocks 60 mafic ultramafic intrusions 60 grade bulk tonnage 60 crackle breccia 60 chalcopyrite copper 60 Igneous Complex 60 hornfels 60 gossan zones 60 andesite flows 60 Cerro La Paila 60 felsite 60 NN Zone 60 mineral occurrences 60 alunite 60 cobalt mineralization 60 Cretaceous limestone 60 variably mineralized 60 trending steeply dipping 60 subhorizontal 60 clastic 60 outcropping veins 60 gabbros 60 felsic tuff 60 Kaukua 60 BHEM 60 spodumene bearing pegmatites 60 quartz ankerite 60 Paleozoic sedimentary 60 calcareous sediments 60 trenching mapping 60 El Domo 60 volcanoclastic 60 VTEM airborne survey 60 Ni Cu PGM 60 anomalies coincident 60 Hallnor 59 aeromagnetics 59 Hadal Awatib 59 mineralized shear 59 quartz alunite 59 sulphide alteration 59 Ground geophysical surveys 59 induced polarization survey 59 airborne radiometric 59 Dar Salam 59 intermediate argillic alteration 59 unconformity style 59 vuggy quartz 59 alteration haloes 59 ultramafic mafic 59 siliceous sediments 59 shallow bulk tonnage 59 Gongondy 59 quartz adularia veins 59 intrusives 59 trace chalcopyrite 59 uraniferous 59 greywackes 59 Archean basement rocks 59 MMI soil geochemical 59 chalcocite covellite 59 disseminated chalcopyrite 59 footwall mineralization 59 erosional window 59 airborne magnetic anomalies 59 element geochemical 59 geophysics prospecting 59 skarn deposits 59 rhyolitic 59 petrographic studies 59 amplitude anomaly 59 Tabakoto pit 59 Key Tuffite 59 airborne EM anomaly 59 silicified structures 59 electromagnetic anomaly 59 kimberlite occurrences 59 fine grained sandstone 59 lamprophyre 59 magnetic geophysical anomaly 59 Bourlamaque Batholith 59 IP chargeability 59 strongly foliated 59 intensely silicified 59 ultramafic unit 59 Aircore drilling 59 disseminated sulphides 59 quartz veins breccias 59 layered ultramafic 59 massive pitchblende 59 sulphidized 59 hypabyssal 59 coincident induced polarization 59 monzonite intrusion 59 chromite mineralization 59 steeply dipping 59 Cadillac Break 59 hematite stained 59 F2 Zone 59 andesites 59 Norlartic 59 argillic altered 59 VTEM airborne 59 Sulphide Shear Zone 59 quartz tourmaline vein 59 WNW ESE 59 quartz sulfide 59 eluvial 59 pyrite mineralization 59 pyroxenite 59 epithermal gold vein 59 silver arsenic antimony 59 sheared diorite 59 CSAMT survey 59 pole dipole 59 quartz pyrite vein 59 sericite quartz 59 mesothermal 59 Paleozoic carbonate 59 mineralized hydrothermal 59 chalcopyrite pyrite 59 porphyry Cu Mo 59 chromitite 59 sedimentary sequence 59 sheeted quartz veins 59 ultramafic sequence 59 section #E [003] 59 alunite alteration 59 radiometric surveys 59 mafic dyke 59 porphyry skarn 59 REE mineralization 59 spodumene rich 59 andesite volcanics 59 pelitic gneiss 59 shear zones 59 Hotish 59 quartz feldspar 59 specularite 59 turbidite 59 gabbro dykes 59 Plata Diatreme 59 skarn alteration 59 ultramafic intrusives 59 South Miwah Bluff 59 sedimentary strata 59 CRE# 59 Kanosak 59 dickite 59 IP Resistivity survey 59 chalcedonic quartz 59 Dioulafoundou zone 59 altered porphyry 59 graphitic schist 59 lithologies 59 alluvial workings 59 mapping trenching 59 Uzboy gold deposit 59 Wireframe models 59 Oshiveli 59 paleochannels 59 schistose 59 tourmaline breccia 59 Once Bocas 59 breccia vein 59 auriferous veins 59 pentlandite 59 Banded Iron Formation BIF 59 grade drill intercepts 59 veins stockworks 59 ignimbrites 59 hematite goethite 59 Shaft Zone 59 massive sulfides 59 Etango deposit 59 HG Sulphide zone 59 quartz calcite 59 sulphide stringers 59 anomalous soil geochemical 59 wallrock 59 breccia pipes 59 Dombraly 59 quartz monzonite intrusive 59 magnetometer survey 59 Marta Este 59 argillites 59 komatiitic 59 Ntaka Hill 59 tungsten mineralization 59 Frio Sands 59 Yaxtche deposit 59 magmatic kimberlite 59 molybdenite bearing 59 massive sulfide 59 MMI anomalies 59 granitoid rocks 59 intrusive dykes 59 radiometric anomalies 59 Klaza property 59 alluvial gravels 59 epithermal gold deposits 59 uranium occurrences 59 leucogranite 59 geochemical anomaly 59 nickel laterite mineralization 59 schists 59 Induced Polarisation IP 59 breccia pipe 59 LONG Bars 59 magmatic sulphides 59 garnet biotite 59 alkaline intrusive 59 brecciated limestone 59 stibnite 59 chargeability highs 59 Ultramafic Zone 59 bearing quartz stockwork 59 pyritic 59 Eskay Creek Silbak Premier 59 Kurupung Batholith 59 intersected mineralized zones 59 clasts 59 Megatem 59 Tan Chaffao East 59 open pitable 59 NW trending 59 radon anomalies 59 gold mineralized quartz 59 HGZ 59 geophysically 59 Siribaya mega structure 59 epithermal gold 59 Animas vein 59 Onkelo 59 basal till 59 K feldspar 59 polymictic conglomerate 59 chalcocite 59 skarn rocks 59 Batholith 59 disseminated pyrrhotite 59 stratigraphic trap 59 diatremes 59 breccia hosted 59 sedimentary sequences 58 Timmins Porcupine West 58 northeast trending sheeted 58 Gwenivere 58 pyrophyllite 58 chalcopyrite pyrrhotite 58 Turonian 58 greisen 58 gravity anomaly 58 biotite altered 58 granitoid 58 massive sulphide horizon 58 pyrrhotite chalcopyrite 58 angular boulders 58 silica chlorite 58 felsic intrusion 58 Zone Bambadinka 58 medium grained 58 sulphidation epithermal 58 felsic metavolcanic 58 intensely oxidized 58 resistivity surveying 58 semi massive sulphide 58 quartz carbonate veining 58 molybdenum porphyry 58 Tigranes 58 syenite intrusive 58 Kena Property 58 granite porphyry 58 abundant quartz veining 58 westerly dipping 58 scintillometer surveys

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