Related by context. All words. (Click for frequent words.) 81 radiometric survey 79 radiometrics 79 geophysical surveys 79 VTEM surveys 78 aeromagnetic survey 78 airborne radiometric survey 78 induced polarization surveys 78 IP geophysical surveys 77 geochemical surveys 77 magnetometer survey 77 airborne radiometric 77 soil geochemical surveys 77 VTEM survey 76 airborne geophysics 76 VTEM airborne survey 76 Geophysical surveys 76 airborne EM 76 magnetometer surveys 76 airborne magnetic 75 geochemical surveying 75 soil geochemical survey 75 magnetic electromagnetic 75 electromagnetic surveys 75 airborne geophysical surveys 75 geological reconnaissance 75 magnetic geophysical surveys 75 prospecting mapping 75 airborne geophysical 75 airborne magnetic survey 74 airborne radiometric anomalies 74 geophysical survey 74 radiometric surveying 74 airborne radiometrics 74 airborne radiometric magnetic 74 Detailed geological mapping 74 detailed aeromagnetic survey 74 geophysical surveying 74 detailed geologic mapping 74 VLF EM survey 74 resistivity surveys 74 ground magnetics 74 soil geochemical sampling 74 EM geophysical survey 74 induced polarization 74 Geotech VTEM 73 detailed airborne magnetic 73 IP geophysics 73 geochemical sampling 73 mapping prospecting 73 airborne electromagnetic 73 detailed geological mapping 73 Induced Polarization 73 electromagnetic geophysical survey 73 ground geophysics 73 geochemical soil 73 Detailed mapping 73 airborne magnetics 73 aeromagnetic surveys 73 Geochemical sampling 73 ground geophysical surveying 73 magnetometric 73 scintillometer surveys 73 airborne VTEM survey 72 aeromagnetics 72 airborne magnetic anomalies 72 outcrop sampling 72 geophysical interpretation 72 airborne electromagnetic survey 72 geophysical geochemical 72 airborne VTEM 72 induced polarization survey 72 electromagnetic EM survey 72 Soil sampling 72 airborne EM survey 72 geological mapping prospecting 72 ground geophysical surveys 72 electromagnetic surveying 72 AeroTEM III 72 aircore drilling 72 termite mound sampling 72 scintillometer survey 72 Geological mapping 72 geologic mapping 72 airborne geophysical anomalies 72 airborne geophysical survey 72 soil geochemistry 72 Geophysical Survey 72 reconnaissance prospecting 71 Megatem 71 magnetic radiometric 71 VLF surveys 71 VTEM airborne 71 geophysical conductors 71 Geologic mapping 71 soil geochemical 71 VTEM anomalies 71 IP induced polarization 71 geological mapping 71 resolution airborne magnetic 71 airborne anomalies 71 IP resistivity survey 71 IP geophysical 71 ZTEM survey 71 Induced Polarisation IP 71 Ground geophysical surveys 71 IP Resistivity survey 71 trench sampling 71 Ground geophysics 71 airborne geophysical surveying 71 mapping trenching 71 auger drill 71 geochemical 71 gravity geophysical surveys 71 IP resistivity 71 resolution aeromagnetic survey 71 geologically mapped 71 EM conductors 71 geophysics prospecting 71 aeromagnetic data 70 radiometric anomalies 70 excavator trenching 70 VTEM 70 Induced Polarisation 70 mechanical trenching 70 magnetometry 70 auger drilling 70 EM anomalies 70 stream sediment 70 geochem anomalies 70 surface trenching 70 soil sampling 70 trenching sampling 70 magnetic geophysical 70 Aircore drilling 70 aeromagnetic 70 Induced Polarization IP 70 HLEM 70 ground radiometric surveys 70 aircore 70 IP Resistivity surveys 70 conductive zones 70 CSAMT 70 geophysical 70 IP Resistivity 70 radiometric geophysical survey 70 surface outcrops 70 AeroTEM II 69 airborne radiometric surveys 69 3D Induced Polarization 69 Time Domain Electromagnetic 69 geochemical samples 69 induced polarization geophysical surveys 69 induced polarization IP 69 lithogeochemical 69 auger sampling 69 geological mapping trenching 69 soil sampling trenching 69 coincident geophysical 69 infill sampling 69 sampling trenching 69 radiometric magnetic 69 Radiometric surveys 69 mapping geochemical sampling 69 Ruhuhu 69 ZTEM 69 prospecting geological mapping 69 prospecting trenching 69 anomalies coincident 69 Airborne geophysics 69 surface geochemical sampling 69 induced polarization geophysical 69 InfiniTEM survey 68 airborne magnetic radiometric 68 magnetometer surveying 68 Radiometric 68 radiometric 68 Abitibi Geophysics 68 XDS VLF EM 68 CSAMT survey 68 TDEM 68 geochemical anomalies 68 aeromagnetic anomalies 68 airborne magnetic surveys 68 induced polarization geophysics 68 RAB drilling 68 Geotech Ltd. 68 calcrete sampling 68 stream sediment geochemical 68 VLF EM surveys 68 resource delineation drilling 68 IP Induced Polarization 68 reconnaissance geological mapping 68 REE bearing 68 2D seismic survey 68 linecutting 68 Airborne Geophysical Survey 68 VLF EM 68 Horizontal Loop Electromagnetic 68 TDEM survey 68 VTEM airborne geophysical 68 mechanized trenching 68 induced polarization anomalies 68 geophysics trenching 68 magnetic anomalies 68 VTEM geophysical survey 67 stream sediment geochemistry 67 heliborne magnetic 67 radiometric prospecting 67 kilometer airborne magnetic 67 petrographic studies 67 VTEM Survey 67 IOCG targets 67 Reverse Circulation 67 VTEM airborne surveys 67 geological geochemical 67 Airborne Survey 67 electro magnetic EM 67 electromagnetic conductors 67 gamma ray spectrometry 67 excavator trenches 67 meter spacing 67 mineralized outcrops 67 gold geochemical anomalies 67 Airborne EM 67 induced polarization resistivity 67 Fugro airborne 67 geological mapping geochemical sampling 67 geochemical geophysical 67 geochemical assays 67 ground radiometric surveying 67 AeroTEM survey 67 meter spacings 67 airborne electromagnetic EM 67 backhoe trenching 67 palaeochannel 66 IP chargeability anomalies 66 Reverse Circulation drilling 66 outcrop exposures 66 geological mapping geochemistry 66 Soil geochemistry 66 AeroTEM 66 MMI soil geochemical 66 Surface sampling 66 resistivity anomalies 66 IP geophysical surveying 66 geophysical surveys trenching 66 Mouchalagane 66 Geotech Airborne Limited 66 Cobrecon 66 adit sampling 66 surface geochemistry 66 anomalous zones 66 Kay Tanda 66 Yanfolila 66 electromagnetic geophysical 66 Induced polarization 66 resolution aeromagnetic 66 gravity anomalies 66 magnetometric survey 66 palaeochannels 66 airborne EM surveys 66 uranium anomalism 66 Bulk sampling 66 extensional drilling 66 diamond drilling 66 Anuri kimberlite 66 helicopter borne VTEM 66 gossanous 66 Gravity Survey 66 anomalism 66 Rare Earth Element REE 66 NQ diamond 66 dipole dipole IP 66 electromagnetic VTEM survey 66 Fugro Airborne Surveys 66 Roughrider East 66 airborne magnetometer survey 66 electromagnetic EM conductors 66 magnetite mineralization 66 Sicera Sur 66 High Resolution Aeromagnetic 66 mineralized skarn 66 geochem 66 grade drill intercepts 65 regolith mapping 65 CSAMT surveys 65 coincident magnetic 65 Itigi Manyoni Uranium 65 airborne magnetic electromagnetic 65 aircore holes 65 outcrop samples 65 Induced Polarization Resistivity 65 airborne electro magnetic 65 Banded Iron Formation 65 MegaTEM 65 DEEPEM 65 geological mapping geochemical 65 Preliminary metallurgical 65 Mag EM 65 anomaly coincident 65 Z TEM 65 anomalous radiometric 65 geophysical targets 65 outcropping quartz veins 65 Geotech Ltd 65 ground magnetometer surveys 65 MEGATEM survey 65 flotation testwork 65 borehole geophysics 65 penetrating electromagnetic 65 Hotish 65 3D induced polarization 65 sampling geological mapping 65 Accha deposit 65 mineralized zones intersected 65 Quantec Geoscience 65 uraniferous 65 approximately #km# [001] 65 soil geochemistry surveys 65 Klaza property 65 geochemical analyzes 65 gradient array 65 RC drillholes 65 Systematic sampling 65 anomalous soil geochemistry 65 geotechnical drilling 65 VTEM targets 65 lithologic 65 Ikungu 65 uranium radiometric anomalies 65 Adumbi Prospect 65 reconnaissance mapping 65 BHEM surveys 65 Electromagnetic EM 65 massive sulphide intersections 65 gossans 65 bulk tonnage mineralization 65 Higo Blanco 64 Reverse circulation 64 diamond drillholes 64 sulphide mineralized 64 Crone Geophysics 64 Geophysical surveying 64 Singida Gold Project 64 geochemical assay 64 manganese mineralization 64 2D seismic surveys 64 soil geochemical anomalies 64 vanadium mineralization 64 gold anomalism 64 Detailed geologic mapping 64 resistivity surveying 64 kimberlitic material 64 sediment sampling 64 Induced Polarization surveys 64 BIF outcrops 64 downhole geophysical 64 metallurgical testwork 64 MPD# 64 NQ diamond drill 64 trenching 64 conductive anomalies 64 MEGATEM II 64 UTEM 64 outcropping mineralization 64 downhole geophysics 64 platinum palladium mineralization 64 airborne magnetometer 64 rockchip 64 Induced Polarization Survey 64 petrographic 64 preliminary metallurgical testwork 64 corehole 64 geological modeling 64 talus fines 64 termite mound geochemistry 64 Soquem 64 calcrete 64 pole dipole 64 MEGATEM 64 Abitibi Geophysique 64 Despoblados 64 RC drilling 64 tungsten mineralization 64 artisanal workings 64 Gradiometer 64 mapping geochemistry 64 bulldozer trenching 64 Simuku 64 geochemistry anomalies 64 magnetite bearing 64 Aeromagnetic 64 REE showings 64 Tres Juanes Norte 64 Sian Praso 64 mineralized intrusive 64 airborne electromagnetic AEM 64 copper anomalism 64 radiometric airborne 64 Emba Derho Adi Nefas 64 anomalous mineralization 64 Reconnaissance mapping 64 Itilima 63 NQ diamond drilling 63 Las Boquillas 63 Letitna 63 Pitaloza 63 IP geophysical anomalies 63 Quantec 63 alluvial workings 63 Calandria Norte 63 Significant intersections 63 Metallurgical testwork 63 kimberlite occurrences 63 Mt Penck 63 borehole geophysical 63 #m@#.#g t Au [001] 63 enzyme leach 63 geophysical datasets 63 variably mineralized 63 geological geophysical 63 radiometric readings 63 Ni Cu PGM mineralization 63 disseminated sulphide mineralization 63 KIMs 63 RC drill 63 drillcore 63 Gossan Hill 63 Surface trenching 63 electromagnetic anomalies 63 Dubenski property 63 RC percussion 63 geological mapping sampling 63 intersected sulphide mineralization 63 airborne electromagnetic anomalies 63 Nyota Prospect 63 geophysical geological 63 Oro Amigo 63 itabirite 63 Induced Potential 63 eluvial deposits 63 GEOTEM 63 Ntaka Hill 63 seismic reprocessing 63 radon anomalies 63 silica pyrite 63 Au Cu mineralization 63 Preliminary metallurgical testwork 63 kimberlite dykes 63 ground geophysics trenching 63 lateritic 63 Guayabales 63 Sesmo Sur 63 delineation drill 63 Fayolle property 63 Cordero Porphyry 63 trenching mapping 63 Koshaj 63 Pulse EM 63 overburden stripping 63 Marban deposit 63 geology geochemistry 63 vein outcrops 63 MMI soil geochemistry 63 Bejucosa 63 mineralized occurrences 63 #m@#.#g t gold [001] 63 garnet skarn 63 ultramafic rock 63 Mankarga 5 63 km 2D seismic 63 basal till 63 Colnic 63 bearing sulphide mineralization 63 kimberlitic 63 epithermal gold targets 63 Delineation drilling 63 Tantamaco 63 Goldpines North 63 MMI anomalies 63 lamprophyre 63 Cu Ni 63 Significant intercepts 63 Purepoint 63 #m@#.#g t gold [002] 63 VTEM conductors 63 petrological 63 Magusi deposit 63 auger geochemical 63 Corachapi 63 Assay Results 63 Terraquest 63 breccia pipes 63 kimberlitic bodies 63 #km 2D seismic 63 mineralogical studies 63 outcropping veins 62 Merensky Reef 62 VTEM electromagnetic 62 coincident geochemical 62 Amax Exploration 62 mineralized quartz veins 62 VTEM conductor 62 Gongondy 62 Magnetometer 62 InfiniTEM 62 Muirs Reef 62 sylvinite 62 #km# [003] 62 magnetic geophysical anomaly 62 metallogenic 62 antimony mineralization 62 kimberlite breccia 62 alteration zones 62 Uzboy 62 WDC# 62 2D seismic data 62 petrophysical evaluation 62 Nakru 62 Cu Au mineralization 62 Titan# 62 Dombraly 62 copper molybdenum mineralization 62 MMI geochemistry 62 Ida Dome 62 kimberlite indicator minerals 62 spectrometric 62 TerraX 62 Tres Juanes 62 ANIT 62 Lac Pau 62 Carotare 62 Fugro Airborne 62 Fofina 62 Aurizona Main 62 Laterite 62 Etango deposit 62 coincident gravity 62 Luhwaika 62 Lunguya 62 gold bearing gravels 62 Metallurgical Testing 62 bedrock outcrops 62 mafic intrusions 62 PGM mineralization 62 Sinchao Property 62 kimberlite dyke 62 epithermal quartz veins 62 spodumene bearing 62 aero magnetic 62 alluvial gravels 62 anomalous geochemical 62 Zone Bambadinka 62 geophysical signatures 62 copper sulphide mineralization 62 PdA Extension 62 IP chargeability 62 Lower Acacus Formation 62 Zona Alta 62 Hushamu 62 Isambara 62 electromagnetic geophysical surveys 62 Diamond Drilling 62 GEOTEM survey 62 Soil geochemical 62 Drill Hole Locations 62 vuggy silica quartz alunite 62 Kangaluwi 62 Anomalous values 62 VTEM geophysical 62 BLEG 62 vuggy silica 62 radiometric anomaly 62 stepout drilling 62 Minera Afrodita 62 Farellon 62 West Pequop 62 Lone Pine Property 62 aeromagnetic anomaly 62 mafic dyke 62 electromagnetic EM geophysical 62 spectrometer readings 62 Seagull Intrusion 62 potentially bulk mineable 62 Highbank Lake 62 Poste Lemoyne Extension 62 auriferous zones 62 molybdenite mineralization 62 sericitic 62 magnetic susceptibility 62 transient electromagnetic 62 Onkelo 62 Kierens 62 inversion modeling 62 Kaniago 62 hematite mineralization 62 kimberlite outcrop 62 EM geophysical 62 EL# [002] 62 #m@#.# % [003] 62 sawn channel 62 mafic intrusive 62 element geochemistry 62 Las Carolinas 62 Geophysical Surveys 62 cobalt mineralization 62 aircore drill 62 Gwabe 62 airborne EM anomalies 62 magnetic gradiometer 62 Oshiveli 62 Sicera Norte 62 Renard cluster 62 NE Wollaston 62 detailed airborne geophysical 62 Okohongo 62 multielement 62 untested geophysical 62 Drill Targets 62 kimberlite float 61 Airborne Surveys 61 Ni Cu PGM 61 Cannivan Gulch 61 Igunda 61 Klaza Zone 61 Airborne Geophysical 61 Malrok 61 Drill hole SADD# 61 diamondiferous kimberlite pipes 61 Tortigny 61 Arsenopyrite 61 airborne magnetic anomaly 61 vein stockwork 61 Reverse Circulation RC 61 Rusk Zone 61 CSAMT geophysical survey 61 structural lineaments 61 Sunbeam Pettigrew property 61 mineralized drill intercepts 61 Akasaba Mine 61 diatreme breccias 61 Messenger Formation 61 Aeroquest Limited 61 Enzyme Leach 61 Testwork 61 pegmatite dykes 61 South Minita 61 gravity gradiometry 61 2D Seismic 61 gossan 61 lithogeochemical sampling 61 silicified zone 61 stockwork breccia 61 McFauld West 61 geophysical induced polarization 61 Footwall Zone 61 diamondiferous kimberlite 61 potash mineralization 61 subcrop 61 bedrock conductors 61 alluvials 61 geologic modeling 61 Wireline logs 61 geological interpretations 61 Seismic surveys 61 mineralized outcrop 61 Hasbrouck Geophysics 61 silicified breccia 61 surface geochemical anomalies 61 Juanicipio Vein 61 Yaramoko 61 hematite goethite 61 Triassic reservoirs 61 magnetotelluric survey 61 alaskite 61 intrusive breccia 61 northwesterly trending 61 scintillometers 61 overburden sampling 61 Y Zr 61 Leman sandstone 61 Turnor Lake 61 infill holes 61 saprolitic 61 Prospecting Licences 61 EW trending 61 formation BIF 61 silicic 61 Nyafe 61 Asankrangwa Holdings 61 approximately #km# [002] 61 Scadding Gold 61 AMMTEC 61 eluvial 61 Mineralized intervals 61 previously undrilled 61 Kalana Mine 61 anomalous uranium 61 sulphide zones 61 Calandria Sur 61 Radiometric Survey 61 stringer mineralization 61 dyke swarms 61 ATP#P 61 surficial 61 Lupoto 61 soil anomalies 61 garimpeiro workings 61 mineral occurrences 61 aircore drill holes 61 anomalous soil geochemical 61 mineralogical analysis 61 Javhlant license 61 structural stratigraphic 61 Gramalote property 61 mineralized breccias 61 advanced argillic alteration 61 induced polarization anomaly 61 reverse circulation 61 Maybrun 61 AHGZ 61 Breccia Zone 61 resistivity geophysical 61 paleochannels 61 Fugro Ground 61 Huarabagoo 61 litho geochemical 61 ground truthing 61 granitoids 61 Chiis 61 E#/# [001] 61 VTEM anomaly 61 intersected mineralized 61 ultramafic intrusives 61 Reconnaissance prospecting 61 JVX 61 Eastmain Mine 61 chromitite 61 volcanic stratigraphy 61 Drill intersections 61 airborne electromagnetics 61 anomalous Au 61 Fobiri 61 mineralized shears 61 drill holes 61 petrographic analysis 61 Nueva Concepcion 61 anomalous geochemistry 61 Dogpaw Lake 61 sulphide bearing 61 sulfide bearing 61 lateral extensions 61 Terraquest Ltd. 61 poly metallic mineralization 61 sidewall cores 61 Miwah Gold Zone 61 bulk sampling 61 lithology 61 EM geophysical surveys 61 mafic intrusion 61 breccia pipe targets 61 geophysically 61 Teapot Granite 61 Siribaya mega structure 61 Hurdman Property 61 Manfo Property 61 Santa Pancha 61 Prefeasibility Study 61 Klappibacken 61 variably altered 61 Villeta T 61 Kipawa deposit 61 Chargeability 61 Ouro Roxo 61 nickel sulphide mineralization 61 gold copper porphyry 61 DUB# 61 outcropping vein 61 supergene mineralization 61 #:#,# scale [002] 61 BHEM 61 Tiriganiaq deposit 61 Nueva Caledonia 61 Kavola East 61 Senior Geochemist 61 stockwork vein 61 Claim Blocks 61 IOCGU 61 geophysics 61 glacial overburden 60 chargeability anomalies 60 JORC resource estimate 60 Induced Polarization IP chargeability 60 Dienemera 60 Otjikoto 60 relogging 60 Bigrlyi 60 anomalous molybdenum values 60 mineralized boulders 60 Sudbury Breccia 60 underground delineation drilling 60 Geotechnical drilling 60 Pellivuoma 60 Mobile Metal Ions 60 resource delineation 60 Coneto 60 Hibou dyke 60 Mistassini property 60 UTEM survey 60 Pucamayo 60 mineralized horizons 60 mineralized intercepts 60 m@#.# g t Au [002] 60 SOMINE property 60 borehole Pulse 60 Silverstreams 60 trenching pitting 60 Harrier Underground 60 Miocene reservoir 60 Mankarga 60 magnetite BIF 60 EM conductor 60 olivine rich 60 drillholes totaling 60 El Compas 60 untested geophysical anomalies 60 process flowsheet 60 Tabita Prospect 60 Grandroy 60 electromagnetic anomaly 60 Au Cu Ag 60 Chimiwungo 60 contracted Geotech Ltd. 60 Kaukua 60 airborne EM conductors 60 Roughrider uranium deposit 60 Zafranal 60 geophysical interpretations 60 monzonite intrusion 60 Naciente Quebrada Pedregosa 60 VTEM Versatile Time 60 Bajo Negro 60 silica breccia 60 chalcedonic 60 Junnagunna 60 Esso Minerals 60 quartz pyrite veins 60 nickel laterite mineralization 60 quartz sulphide 60 geological interpretation 60 wireline logging 60 alaskites 60 Cumpie Hill 60 Cu Au 60 Airborne Magnetic 60 Geophysical Targets 60 drillhole database 60 mineralized showings 60 Alaskite 60 Lugushwa 60 mineralized breccia 60 tenement E#/# 60 shallowly dipping 60 UG2 Reef 60 Zechstein 60 Ciresata 60 Geochemical surveys 60 McFauld 60 El Domo deposit 60 NN Zone 60 geochemistry 60 Mineralised 60 Hadal Awatib 60 Soil Anomaly 60 Adi Nefas 60 Douay Ouest 60 Cata Clavo 60 Gradient Geophysics 60 auriferous quartz 60 mineralized alteration 60 volcanogenic massive sulfide 60 outcrops 60 Nithi Mountain 60 Handcamp 60 diamond drill 60 pelitic gneisses 60 proposed Bonanza Ledge 60 massive sulphide lenses 60 Puella Bay 60 Aeroquest 60 colluvial 60 reprocessed seismic 60 Significant assay 60 Pinguino property 60 Infill drilling 60 gravity anomaly 60 anomalous concentrations 60 NAD# [002] 60 Vaca Muerta 60 Sahavaara 60 dravite 60 quartz sulphide veins 60 Veta Madre 60 calcrete hosted uranium 60 uranium occurrences 60 borehole electromagnetic 60 Radiometrics 60 Au Cu 60 geophysical conductor 60 delineation drilling 60 Haquira Project 60 Onaman 60 Central Mineralised Zone 60 Goldcreek Property 60 epithermal veins 60 Bellechasse Timmins 60 magnetite alteration 60 3D Seismic 60 disseminated magnetite 60 Geochemical analysis 60 diamond drill intercepts 60 jasperoids 60 uranium vanadium mineralization 60 Volcanogenic Massive Sulphide VMS 60 lake sediment geochemical 60 CUMO 60 breccia mineralization 60 Pokukrom West 60 Butia prospect 60 magnetite ilmenite mineralization 60 Uranium Mineralization 60 Gjegjan 60 Induced Polarization geophysical surveys 60 Imwauna Project 60 Shivee West 60 subhorizontal 60 stratigraphically below 60 #WR# 60 situ measurements 60 conductivity anomalies 60 copper skarn 60 #:# scale 60 Norlartic 60 DDH# [001] 60 Kelex 60 Bellechasse Timmins deposit 60 Induced Polarization geophysical 60 Resistivity 60 Ronguen 60 Epithermal 60 diatremes 60 MegaTEM II 60 UG2 reef 60 McPhar 60 spodumene bearing pegmatite 60 inferred resource calculation 60 massive sulphide deposits 60 extensive artisanal workings 60 IOCG mineralization 60 quartz stockworks 60 Ni Cu PGE mineralization 60 HRAM 60 electromagnetic EM 60 Shirotnaia zone 60 intersected kimberlite 60 REE mineralized 60 PONTAX property 60 Nkran 60 sulfide deposits 60 pyrite pyrrhotite chalcopyrite 60 Encino Vein 60 Grade interpolation 60 Gradient Array 60 Thelon Basin 60 Pasfield Lake 60 mineralized diatreme breccia 60 polymetallic mineralized 60 porphyries 60 coincident anomalous 60 scheelite bearing 60 carbonatite complex 60 Leitch Sand River 60 Skarn Zone 60 Nyieme 60 Amaruk property 60 anomalous chargeability 60 Boxey Point 60 steeply dipping fault 60 Dioulafoundou 59 3D seismic surveys 59 Opinaca Nord 59 saprolite 59 penetrating geophysical 59 EVx 59 volcano sedimentary belt 59 Sulphide mineralization 59 porphyry intrusives 59 sulphide alteration 59 jasperoid