Related by context. All words. (Click for frequent words.) 70 Rare Earth Element REE 70 El Compas 70 Timmins Porcupine West 70 Geologic mapping 70 El Cometa 69 Chucara 69 outcropping mineralization 69 Jumping Josephine 69 Tungsten Molybdenum 68 excavator trenching 68 Banded Iron Formation 68 Scadding Gold 68 Eastford Lake 68 Moly Brook 68 Mouchalagane 68 Regcourt 68 Roughrider East 68 soil geochemical survey 68 Haukiaho 68 Highbank Lake 67 magmatic nickel copper 67 downdip extension 67 Kenville Gold Mine 67 Ntaka Hill 67 Kuriskova 67 Detailed geological mapping 67 Dubenski property 67 Louvicourt 67 outcrop sampling 67 Bisha Main 67 mineralized skarn 67 Las Bolas structure 67 EM geophysical survey 67 lithologic 67 AHGZ 67 Bellechasse Timmins 67 Malrok 67 geophysics prospecting 67 Las Bolas Los Hilos 67 Skukum Creek 67 Dogpaw Lake 67 Thor Trend 66 Pidgeon Molybdenum Deposit 66 volcanic stratigraphy 66 ZTEM survey 66 Ni Cu PGM 66 Frankfield East 66 Alaskite 66 Estrades 66 Dogpaw 66 extensional drilling 66 Goldpines North 66 Hushamu 66 Boomerang massive sulphide 66 Riviere des Plantes 66 Simuku 66 reconnaissance mapping 66 outcropping vein 66 Homestake Silver 66 Dombraly 66 detailed airborne magnetic 66 East Acma 66 Anchaca 66 Cu Ni 66 surface outcrops 66 dike swarm 66 Zam Zam Shenkman 66 Walsh Katrine 66 Southeast Pediment 66 Pokukrom West 66 Junnagunna 66 Big Daddy Chromite 66 Kena Gold 66 Dubenski Shaft Zone 66 surface trenching 66 exhalite 66 Gold Oxide Skarn 66 McClarty Lake 66 Marban Block 66 felsic volcanic 66 NQ diamond 66 magnetometer survey 66 Minita deposit 66 West Pequop 66 auriferous zones 66 Norlartic 66 bearing sulphide mineralization 66 Nixon Bartleman 66 Epithermal 66 mechanical trenching 66 gold copper porphyry 66 mesothermal gold 65 Detailed mapping 65 VTEM airborne survey 65 gold geochemical anomalies 65 Aricheng C 65 IP geophysical surveys 65 geological geochemical 65 stratigraphically below 65 hematite mineralization 65 Silica Ridge 65 Kanosak 65 Tib Lake 65 Main Homestake 65 Geological mapping 65 Ida Dome 65 Eastmain Mine 65 Las Boquillas 65 Western Porphyry Zone 65 surface geochemistry 65 Anuri kimberlite 65 Cu Zn 65 potentially open pittable 65 Culebrilla 65 sulphide mineralized 65 unpatented lode claims 65 Kierens 65 Marban deposit 65 outcrop subcrop 65 Duddridge Lake 65 Tulks South 65 McFaulds Lake Property 65 geophysical geochemical 65 Sachigo Greenstone Belt 65 Itigi Manyoni Uranium 65 IP chargeability anomalies 65 Tortigny deposit 65 geological mapping trenching 65 El Creston molybdenum 65 Porcupine Destor Fault 65 quartz sulphide vein 65 Aappaluttoq 65 Volcanogenic Massive Sulphide VMS 65 Aricheng West 65 mineralized occurrences 65 #,# acre Angilak 65 mineralized pegmatite 65 Riscos 65 Orogrande Shear Zone 65 Snowfield Zone 65 Nueva Concepcion 65 Santa Pancha 65 REE mineralized 65 Ciresata deposit 65 Ouro Verde deposit 65 Meliadine West 65 Norpax Deposit 65 volcanogenic massive sulfide VMS 65 detailed geologic mapping 65 Fry Inlet 65 Au Cu Ag 65 magnetite bearing 65 El Rayo structure 65 Beardmore Geraldton Gold 65 approximately #km# [002] 65 West Cedartree Gold 65 gossan 65 Nyafe 65 Cu Au 65 molybdenum tungsten 65 enzyme leach 65 potentially bulk mineable 65 geochemically anomalous 65 Amaruk property 65 geophysical conductors 65 Yuinmery 65 Itilima 65 stockwork breccia 65 tuffaceous 65 Avion Tabakoto 65 Minapampa 65 Brucejack Project 65 Zafranal 65 soil geochemical surveys 65 IP geophysical 65 copper molybdenum gold 65 El Compas vein 64 Kelex 64 South Minita 64 Tantamaco 64 Fold Nose 64 mineralized shear zones 64 NE Wollaston 64 Skukum 64 Vaquillas 64 Heruga deposit 64 VLF surveys 64 Shaft Zone 64 Uzboy 64 Ni Cu PGM mineralization 64 ENE trending 64 Douay Ouest 64 MC Dalhousie 64 Pucarana 64 Soquem 64 Cadillac Break 64 Cu Zn Ag 64 Condor de Oro 64 electromagnetic geophysical survey 64 Yaxtche deposit 64 Azulitas 64 coincident geophysical 64 approximately #km# [001] 64 Cu Au mineralization 64 Geophysical surveys 64 conductive zones 64 Cerro Moly 64 detailed aeromagnetic survey 64 kimberlite dyke 64 Croxall Property 64 geophysical surveys trenching 64 Don Ese 64 surface geochemical sampling 64 untested geophysical 64 volcanogenic 64 Clay Howells 64 South Miwah Bluff 64 Molybdenum Copper 64 Zn Pb 64 Ag Pb Zn 64 Zuun Mod deposit 64 Penasco Quemado 64 ultramafic intrusives 64 borehole EM 64 Lipena 64 radiometrics 64 silica pyrite 64 VTEM targets 64 diamond drillholes 64 mineralized zones intersected 64 Kalana Mine 64 Bonanza Ledge 64 Huarabagoo 64 Shining Tree Gold 64 Nicholas Denys 64 airborne geophysical anomalies 64 Shebandowan 64 Kena Property 64 Lac Levac 64 itabirite 64 Calvario Vein 64 Tortigny 64 IP Resistivity survey 64 Namoya Summit 64 favorable stratigraphy 64 ground radiometric surveys 64 Bokan Dotson Ridge 64 IP induced polarization 64 Money Knob 64 erosional window 64 volcanic sedimentary 64 Au Ag Pb Zn 64 anomalous soil geochemistry 64 trenching sampling 64 Luiri Hill 64 Riscos de Oro 64 disseminated sulphide 64 Breccia Zone 64 Kettukuusikko 64 Gramalote property 64 mafic intrusive 64 Roughrider uranium 64 Akasaba Mine 64 La Solucion 64 LONG Bars 64 copper sulphide 64 Airborne geophysics 64 Mikwam 64 Kwanika 64 geological mapping geochemistry 64 Capoose 64 Cannivan Gulch 64 hole CJV 64 Dargues 64 JAK Zone 64 Corani silver 64 Ouro Verde Deposit 64 mineralized outcrops 64 Palito Main 64 Tatajuba 64 Sicera Sur 64 Ground geophysics 64 Platreef 64 Lapaska 64 Aurizon Joanna 64 massive sulphide VMS 64 Tres Juanes Norte 64 La Mascota zone 63 VTEM geophysical 63 Porcupine Destor 63 induced polarization survey 63 Cobre Grande 63 copper molybdenum porphyry 63 IP geophysical surveying 63 Megatem 63 induced polarization surveys 63 Guayabales 63 northerly trending 63 Atikwa Lake property 63 epithermal silver 63 ODAE 63 kimberlite occurrences 63 Heruga Deposit 63 rockchip 63 Klaza 63 anomalous geochemical 63 sparsely drilled 63 bulk minable 63 vanadium mineralization 63 Starvation Canyon 63 Nithi Mountain 63 anomalous uranium 63 geochemical soil 63 volcanogenic massive sulfide 63 granitoid bodies 63 Langmuir Township 63 Lac Cinquante deposit 63 geochemical surveying 63 electromagnetic conductors 63 #.#gpt gold [001] 63 Destor Porcupine fault 63 Skarn Zones 63 Au Cu mineralization 63 TerraX 63 ground geophysical surveying 63 Ouro Roxo 63 Naybob 63 Fermont Iron Property 63 Sisson Brook 63 Buffalo Ankerite 63 Bedard Dyke 63 mapping trenching 63 Goldbanks 63 El Quevar project 63 Kambalda style 63 ultramafic rock 63 copper skarn 63 geology geochemistry 63 Brucejack 63 molybdenum porphyry 63 Marge Vein 63 quartz lode 63 Emba Derho 63 m@#.# g t Au [002] 63 Gramalote 63 McFauld 63 Singida Gold Property 63 manganese mineralization 63 sulfidation style 63 Dory Pond 63 Cerro de Oro 63 ground magnetics 63 copper molybdenum mineralization 63 Chiis 63 Kerr Sulphurets 63 Ayelen Vein 63 Frea vein 63 Pigiput 63 radiometric anomalies 63 mineralized gabbro 63 Riou Lake 63 Cu Mo Au 63 Ccaccapaqui 63 Nopalera 63 magnetite mineralization 63 Dadiangou 63 magnetometric 63 mineralized dykes 63 Dioulafoundou 63 metavolcanic 63 hole HR# 63 Bigrlyi 63 Friday Petsite 63 Au Cu 63 Nyota Prospect 63 talus fines 63 Cannu zone 63 Gossan Hill 63 mafic ultramafic intrusions 63 linecutting 63 Tintina Gold Province 63 drill hole HR# 63 airborne radiometric 63 jasperoid 63 Mapimi 63 formation BIF 63 Calandria Sur 63 Njame 63 sulphide bearing 63 EM conductors 63 Skarn Zone 63 monzonite intrusion 63 Fayolle Property 63 Webbs Silver 63 Heruga 63 MMI anomalies 63 Goldex Mine 63 mineralized horizon 63 Mactung 63 Coneto 63 downhole geophysics 63 Yaramoko 63 Crackingstone 63 veins stockworks 63 vein stockworks 63 mapping geochemical sampling 63 Pucamayo 63 Ag Au 63 Delineation drilling 63 Iron Titanium Vanadium 63 Imwauna 63 Bambadinka trend 63 scheelite bearing 63 vein stockwork 63 Carheil 63 Pantanillo 63 porphyry skarn 63 NNE trending 63 Ronguen gold 63 antimony Sb 63 auger drill 63 Parkin Offset 63 Geotech VTEM 63 Cobrecon 63 TiTac 63 calcrete sampling 63 infill sampling 63 Mankarga 5 63 Encino Gordo 63 coincident magnetic 63 Cerro Maricunga 63 Ciresata Porphyry 63 Valle Esperanza 63 Hemlo Gold 63 Assean Lake 63 porphyry Cu 63 WNW trending 63 GG6 63 mineralized showings 63 Canamerica 63 vein breccia 63 helicopter borne VTEM 63 Sunbeam Pettigrew property 63 Prospector Mountain 63 aeromagnetics 63 fluorite mineralization 63 Nyieme 63 airborne magnetometer 63 Cu Au porphyry 63 prospecting geological mapping 63 lithogeochemical 63 Angela Vein 63 intrusive breccia 63 geologically mapped 63 Zone Bambadinka 63 quartz sulphide veins 63 mineable resource 63 Onaman 63 Paleozoic sedimentary 63 Miwah Gold Zone 63 3D induced polarization 63 La Morocha 63 bearing breccias 63 Opinaca Nord 63 silver indium 63 arsenopyrite mineralization 63 La Blache 63 mapping prospecting 63 Etango deposit 63 Croinor 63 CSAMT geophysical survey 63 mafic intrusives 63 sulphide zones 63 Somituri Project 62 epithermal veins 62 previously undrilled 62 Klaza Zone 62 geophysics trenching 62 Ticho Project 62 Planchas de Plata 62 La Prieta 62 epithermal gold vein 62 Star Kimberlite 62 coincident anomalous 62 mineralization encountered 62 Corachapi 62 sulphide occurrences 62 Artillery Peak 62 paleochannel 62 copper molybdenum silver 62 Slave Craton 62 Hoidas Lake 62 Filo de Oro 62 hole RC# 62 Carscallen Gold 62 Geochemical sampling 62 Leduc Formation 62 Mato Velho 62 bulk mineable gold 62 Tyranite 62 induced polarization 62 alunite alteration 62 altered rhyolite 62 airborne magnetometer survey 62 uraniferous 62 mafic intrusions 62 Brabant Lake 62 Teapot Granite 62 Ogama Rockland 62 Broulan Reef 62 bulk minable gold 62 molybdenum rhenium copper 62 Darnley Bay gravity 62 ODM# 62 outcrop exposures 62 outcrop stripping 62 Mt Penck 62 Massive Sulphide VMS 62 Archean aged 62 Tiriganiaq 62 Kobada 62 Tuvatu 62 IOCG targets 62 magnetic electromagnetic 62 Xstrata Copper Las Bambas 62 Yanque deposit 62 Chucapaca 62 Kingurutik River 62 steeply dipping fault 62 variably siliceous fine grained 62 Quebrada Verde 62 ground geophysical surveys 62 Solotomo 62 Djambaye 2 62 induced polarization geophysics 62 mineralized horizons 62 Extension Occurrence 62 Takom 62 calc silicate 62 palaeochannel 62 meta sedimentary 62 VTEM surveys 62 Roughrider Zone uranium 62 Foy Offset Dike 62 Rottenstone 62 Oyu Tolgoi mineralized 62 auriferous 62 Cluff Lake 62 Bronson Slope deposit 62 VTEM anomalies 62 Homestake Ridge 62 Val d'Or Malartic 62 Imwauna Project 62 saprolitic 62 La Josefina 62 sheeted vein 62 trending mineralized 62 Induced Polarisation IP 62 geological mapping prospecting 62 McFaulds 62 Tad Toro 62 airborne EM 62 drillhole spacing 62 Greenstone belt 62 Curipamba 62 Molybdenum Mineralization 62 Koshaj 62 Harrier Underground 62 Magambazi 62 IP Resistivity 62 Pivert East 62 Magusi deposit 62 polymetallic massive sulphide 62 gold arsenic antimony 62 scheelite 62 Bejucosa 62 Cumpie Hill 62 IOCGU 62 soil geochemical sampling 62 Lamelee 62 granodiorite porphyry 62 Rusk Zone 62 airborne VTEM 62 Larder Lake Cadillac 62 Goldstorm 62 Citronen 62 prospective lithologies 62 Induced Polarisation 62 Heruga copper gold 62 sampling trenching 62 Antimony Mountain 62 antimony mineralization 62 Alaskite Zone 62 Taricori 62 Copper Cobalt 62 Nemegosenda 62 Cerro la Paila 62 ODM# Zone 62 Birch Uchi 62 El Rayo silver 62 Lac Pelletier 62 airborne geophysical surveying 62 Sierra Pintada 62 Vianey Mine 62 Higo Blanco 62 Riviere Dore Copper 62 Fobiri 62 leachable copper 62 untested geophysical anomalies 62 Surface sampling 62 Soil sampling 62 PGM mineralization 62 Oro Amigo 62 Animas vein 62 Suuri zone 62 Matoush fault 62 Banded Iron Formation BIF 62 breccia pipe targets 62 Adumbi Prospect 62 Casa Berardi Mine 62 Butia prospect 62 Massive Sulphide 62 polymetalic 62 airborne magnetic 62 Perestroika Prospect 62 Kaukua 62 aeromagnetic anomalies 62 reconnaissance prospecting 62 kimberlite dykes 62 low sulphidation 62 Zn Cu Ag 62 airborne magnetics 62 airborne radiometric magnetic 62 Chimiwungo 62 calcrete hosted uranium 62 Bonny Fault 62 garnet skarn 62 vein outcrops 62 BB# [002] 62 Foisey Larson 62 Pb Zn 62 Bajo Negro 62 Induced polarization IP 62 Explor Resources 62 surface geochemical anomalies 62 Aiguebelle Goldfields 62 Sourdough Ridge 62 Dorothy Dobie 62 Cu Au Mo 62 HoneyBadger 62 Hemlo 62 Gongondy 62 Farellon 62 Bouroum 62 bearing quartz vein 62 Hibou dyke 62 Accha deposit 62 VTEM survey 62 Haquira Project 62 Discovery Outcrop 62 Wachigabau 62 MMI geochemistry 62 Quesnel Trough 62 previously unsampled 62 polymetallic mineralized 62 Garrcon shaft zones 62 Bracemac 62 radiometric surveying 62 Flin Flon Snow 62 geochemical anomalies 62 trenching mapping 62 Ni Cu 62 coincident geochemical 62 Davcha 62 geological mapping geochemical 62 Ni Cu PGE 62 banded iron 62 intersected anomalous 62 Porphyry Copper 62 Induced Polarization 62 Granduc 62 Breccia Pipe 62 prolific Carlin Trend 62 Taurus Deposit 62 Fossey Zone 62 gold porphyry mineralization 62 drillholes totaling 62 Mulatos Pit 62 Lac Pivert Rose 62 Lalor deposit 62 skarn mineralization 62 Reverse circulation 62 airborne radiometric survey 62 Lone Pine Property 62 Intrusive Complex 62 mineralized corridor 62 open pittable 62 Suurikuusikko 62 prospective stratigraphy 62 Mantouchiche showing 62 Kenwest 62 #ppm molybdenum [002] 62 Tiriganiaq deposit 62 near Schefferville Quebec 62 Bakoudou Magnima 62 mineralized breccia 62 Hangingwall 62 Tiekoumala 62 #m@#.# g t [002] 62 DDH# [001] 62 systematic geochemical sampling 61 Barre de Fer 61 Kitenge gold 61 Bracemac Key Tuffite 61 open pittable gold 61 Carmacks Copper Gold 61 laterite mineralization 61 gravity geophysical surveys 61 Amun Deeps 61 Greenschist Zone 61 Claim Block 61 stepout drilling 61 Niblack Project 61 REE bearing 61 Cadillac Larder Lake 61 Hemlo gold 61 shallowly dipping 61 Animas Del Norte 61 Grota Seca 61 intensely silicified 61 disseminated stringer 61 drilled thicknesses 61 drill hole SADD# 61 maiden JORC resource 61 Javhlant license 61 Dubenski Gold 61 Muirs Reef 61 Letitna 61 Igunda 61 Selodong 61 Manbarrum 61 Huicicila 61 stratigraphic horizon 61 quartz ankerite 61 Ridgetop deposit 61 averaging #.#g t [003] 61 Main Lode 61 felsic intrusive rocks 61 Eskay Creek Silbak Premier 61 extensive artisanal workings 61 Eagle Nest deposit 61 Valdecanas 61 Sulphide Shear Zone 61 Klaza property 61 Whistle Offset 61 biotite rich 61 Afton Ajax 61 Onkelo 61 chromitite 61 induced polarization geophysical surveys 61 El Orito vein 61 Pilanesberg Project 61 mineralized outcrop 61 nickel Ni 61 Caladay 61 Silverjack 61 outcropping quartz veins 61 Guajes West 61 Las Bolas deposit 61 Chu Molybdenum 61 Golouma West 61 #WR# 61 Proterozoic aged 61 mineralized breccias 61 Cordero Porphyry 61 nickel PGM 61 airborne geophysics 61 #m@#.#g t Au [001] 61 Camflo West 61 Black Thor chromite 61 Lemarchant Prospect 61 weakly anomalous 61 Section #E [001] 61 Nueva Caledonia 61 Hotish 61 Ouzzal 61 historically productive Mirdita 61 Tami Mosi 61 tungsten mineralization 61 Phuoc Son Gold 61 aircore drill 61 Selbaie 61 Xstrata Nickel Raglan Mine 61 Cerro Las Minitas 61 Zuun Mod molybdenum 61 rhyolite tuffs 61 IP geophysical anomalies 61 sulphide lenses 61 Sleeping Giant Zone 61 NN Zone 61 MMI soil geochemical 61 Bellekeno deposit 61 Yaragua 61 prospecting trenching 61 intersected sulphide mineralization 61 La Bodega zone 61 Langmuir Nickel Discovery 61 Airborne Survey 61 Aurizon Casa Berardi 61 strongly silicified 61 Riviere Dore 61 radiometric survey 61 Ganes Creek 61 Yaxtche zone 61 massive sulphide horizon 61 Seabridge Gold KSM 61 Los Zorros 61 titanomagnetite 61 Claim Blocks 61 supergene copper 61 NQ diameter 61 variably mineralized 61 Skukum Creek gold 61 Flin Flon Greenstone Belt 61 3Ace 61 Leitch Sand River 61 La Preciosa silver 61 Shivee West 61 Shirotnaia 61 averaging #.#g t [002] 61 ground magnetometer surveys 61 Sulphide mineralization 61 scintillometer surveys 61 Adi Nefas 61 Ciresata 61 Anomalous gold 61 Lac Herbin 61 SADD# 61 anticlinal axis 61 Vargbacken 61 pyrite arsenopyrite 61 Brookbank Gold 61 ground geophysics 61 Dogpaw Lake property 61 Pinguino property 61 Wellgreen 61 polymetallic mineralization 61 Tumpangpitu 61 Leprechaun Deposit 61 sulphide breccia 61 alaskite hosted 61 Au Ag Cu 61 proposed Bonanza Ledge 61 potentially mineable 61 Chisna 61 Sorowar 61 Felsic 61 Brucejack Projects 61 Noront Double 61 cherty 61 Thrust Fault 61 Pampa Poroma 61 Duvay 61 induced polarization anomalies 61 Las Calandrias 61 stream sediment geochemical 61 Diamond Drill 61 Nordeau 61 lateral extensions 61 Los Candelones 61 sulfide mineralization 61 Longshot Ridge 61 Manibridge 61 epithermal deposit 61 Confirms Continuity 61 mineralized quartz veins 61 Pan de Azucar 61 Dublin Gulch 61 IP resistivity 61 Lynx Hibou system 61 Kvanefjeld 61 Bororo Nuevo 61 andesite volcanics 61 commercially mineable 61 Bracemac Zone 61 MMI anomaly 61 VTEM conductors 61 mineralized stockwork 61 Kenieba concession 61 Porphyry Zone 61 Medrizien 61 anomalous zones 61 VVGD 61 mineralized diorite 61 mineralized shear zone 61 MR# #C 61 kilometer airborne magnetic 61 Cata Clavo 61 historic Lac Cinquante 61 bulk mineable 61 Massive Sulfide 61 EW trending 61 Gwabe 61 Opikeigen 61 volcanogenic massive sulphide 61 quartz hematite 61 Magistral deposits 61 electromagnetic EM survey 61 arsenopyrite bearing 61 La Jojoba 61 backhoe trenching 61 steeply plunging 61 massive sulphide deposits 61 Hurdman Property 61 borehole geophysics 61 Lac Herbin mine 61 South Barnat deposit 61 mineralizations 61 Uruachic Camp 61 VTEM anomaly 61 Golouma South 61 Sian Praso 61 Mineralization Extended 61 Drilling Extends 61 VTEM 61 intersected mineralized 61 Hosco deposit 61 Buffalo Ankerite Property 61 Wabassi 61 Las Bolas 61 Kiggavik deposits 61 hole GF# 61 Djambaye II 61 Y Zr 61 Tres Chorreras 61 carbonatite complex 61 Tintina gold 61 Bornite 61 advanced argillic alteration 61 Hache lens 61 Inmaculada Project 61 Ground geophysical surveys 61 mineralized alteration 61 volcanic massive sulphide 61 Skarn 61 surface bulk tonnage 61 Oshiveli 61 Au Cu porphyry 61 massive sulphide lens 61 #.#g t Au [004] 61 sulphide veins 61 basal till 61 Mistassini 61 Taunus pit 61 holes #WR# 61 metres@#.# % [002] 61 intersected anomalous gold 61 mineralized vein 61 Enzyme Leach soil 61 leachable copper mineralization 61 Colnic 61 Aillik 61 hydrothermal brecciation 61 Pipestone Fault 61 dipole dipole IP 61 Athabasca Uranium 61 ultramafic intrusion 61 volcaniclastic rocks 61 Mineralized Zone 61 Calandria Norte 61 syenite porphyry 61 Dios Padre 61 Incahuasi 61 Liontown 61 Ambrex 61 Hallnor 61 sulphide deposit 61 HPM Forgues Property 61 Leprechaun Pond 61 Huajoto 61 Wildfire Copper Keel 61 Macassa mine 61 Cieneguita 61 litho geochemical 61 #.#g t [004] 61 IP geophysical anomaly 61 Nariin Sukhait 61 geochemical geophysical 61 mafic intrusion 61 Shoreline Basalt 61 Mineralized intercepts 61 Fayolle deposit 61 stringer mineralization 61 Fabie Bay 61 McFauld West 61 gossanous 61 stratigraphic horizons 61 mineralized sandstone 61 massive sulphide zones