Related by context. All words. (Click for frequent words.) 67 Tintina Gold Belt 66 copper cobalt deposit 66 Greenstone belt 65 greenstone belt 65 Kilo Moto 64 PGM deposit 64 greenstone belts 64 PGM deposits 63 Husab Uranium Project 63 nickel sulphide deposits 63 nickel laterite deposits 63 Kabanga 63 Deseado Massif 62 Chucapaca 62 Dukwe Project 62 prolific Carlin Trend 62 Ganarin 62 poly metallic 62 Tocantinzinho 62 metallogenic belt 62 Kalahari Copper 62 Goldbanks 62 polymetallic deposit 62 Cordillera del Condor 62 Abitibi greenstone belt 62 Swayze Greenstone Belt 62 nickel laterite deposit 61 Abitibi Greenstone Belt 61 Labrador Trough 61 massive sulphide VMS 61 Zambian Copperbelt 61 volcanogenic massive sulphide VMS 61 Tulawaka 61 Culebrilla 61 prolific Abitibi Greenstone Belt 61 porphyry copper deposit 61 Banfora Gold Project 61 Katangan Copperbelt 61 Mineral Belt 61 laterite deposits 61 Kabanga nickel 60 gold copper porphyry 60 Dumico 60 Witwatersrand Basin 60 alluvial diamond 60 Njame 60 Bushveld complex 60 Abitibi Greenstone belt 60 Asankrangwa Gold Belt 60 Pequop 60 Cortez Trend 60 Copper Cobalt 60 Magistral Project 60 copper porphyry 60 Bushveld Complex 60 Ni Cu PGE 60 Besakoa 60 Quesnel Trough 60 Birimian 59 Tolgoi 59 Mkuju 59 Wa Lawra 59 Itilima 59 Ashanti Belt 59 granodiorite intrusive 59 epithermal gold deposits 59 Au Cu 59 IOCG mineralization 59 Titiribi 59 porphyry deposit 59 Batopilas 59 Geita Gold Mine 59 Mt Penck 59 Northcore Project 59 Sabodala gold 59 Kootenay Arc 59 Marmato Mountain 59 Falea Uranium Silver 59 sulphide deposit 59 Catamarca Province 59 Otjikoto Gold Project 59 prolifically mineralized 59 gold copper porphyries 59 calcrete hosted uranium 59 Hypogene 59 Falea 59 molybdenum tungsten 59 Esaase 59 Kaoko property 59 La Jojoba 59 Ouro Roxo 59 metallogenic 59 Kechika Trough 59 Iberian Pyrite Belt 59 Mineralisation 59 Husab uranium project 58 Middle Cauca 58 Platreef 58 open pittable 58 Alluvial Diamond 58 Matsitama 58 alluvial workings 58 Mabale Hills 58 orogenic gold 58 Gaoua Project 58 iron vanadium titanium 58 manganese mineralization 58 Esaase Gold 58 cobalt mineralization 58 Kalumines 58 goldfield 58 mineralization occurs 58 lithium tantalum 58 Tete Province 58 VMS deposit 58 Greenstone Belt 58 Bombore Project 58 Duparquet 58 bulk mineable gold 58 Nkout 58 copper molybdenum 58 Zinc Lead 58 Gcwihaba projects 58 Toroparu 58 Sefwi Belt 58 HBB properties 58 Rare Metal 58 volcanogenic massive sulphide 58 gold porphyry mineralization 58 Saskatchewan Athabasca Basin 58 Kobada 58 copper molybdenum gold 58 Volcanogenic Massive Sulphide VMS 58 Dadiangou 58 Yanfolila 58 Duparquet Township 58 Mineralized Zone 58 volcanic massive sulphide 58 breccia hosted 58 Komana 58 Chubut Province 58 Esquilache 58 Kileba 58 epithermal precious 58 San Lucas Orogenic 58 Tulks 58 Kipushi 58 Frankfield East 58 orebodies 58 epithermal vein 58 Gramalote 58 Limosna 58 VMS deposits 58 Birimian Greenstone Belt 58 bearing kimberlite 58 Chubut Argentina 58 Flin Flon Greenstone Belt 58 Carbonatite Complex 58 Agbaou 58 Guayabales 57 tungsten molybdenum 57 Juanicipio Joint Venture 57 low sulphidation 57 alluvial diamond deposits 57 Woodjam 57 Droujba kimberlite pipe 57 Asmara Project 57 nickel sulfide 57 Lugushwa 57 Williamson Mwadui 57 alluvial deposits 57 Uchi Subprovince 57 La Rioja Province 57 Geraldton Beardmore 57 Nordeau East 57 Ofin river 57 Silver Lead Zinc 57 Carlin Trend 57 favorable stratigraphy 57 Tapajos Gold 57 Epithermal Gold 57 skarn deposit 57 epithermal silver 57 Birimian greenstone belt 57 Carajas Mineral Province 57 Slave Craton 57 Volcanic Belt 57 Komana West 57 epithermal gold silver 57 Ivanhoe Mines Oyu Tolgoi 57 Chapudi 57 Iron Quadrangle 57 copper cobalt 57 Tombstone Mining 57 Handeni 57 Etango Uranium Project 57 DPFZ 57 Porcupine Destor Fault 57 mineral tenements 57 Manfo Property 57 Cerro Negro gold 57 Kaniago 57 Zona Alta 57 Nechako Plateau 57 Otjikoto 57 volcano sedimentary belt 57 epithermal gold targets 57 Inata 57 Taricori 57 Pb Zn Ag 57 Taviche 57 vanadium mineralization 57 El Torno 57 Rossing mine 57 laterite deposit 57 Tally Pond 57 Boromo greenstone belt 57 Rossing Mine 57 Concepcion del Oro 57 prolific Sierra Madre 57 Rössing South 57 JM Reef 57 Pinaya Project 57 epithermal gold mineralization 57 Langmuir Township 57 epithermal veins 57 PGM mineralization 57 Ronguen gold 57 Ni Cu PGM 57 disseminated nickel sulphide 57 Uranium mineralization 57 Iron Oxide Copper 57 bulk tonnage gold 57 deformation zone 57 epithermal gold vein 57 porphyries 57 geological similarities 57 Husab project 57 Igneous Complex 57 Zanzui 57 Pinaya 57 Marmato 57 Mtonya 57 polymetallic 57 Taldybulak 57 Komahun Gold Project 57 geologically prospective 56 polymetallic mine 56 copper platinum palladium 56 Penasquito deposit 56 Tungsten Molybdenum 56 Boseto Copper Project 56 Yilgarn Craton 56 Cu Au porphyry 56 Rare Earth Element REE 56 Yoquivo 56 Bushveld Igneous Complex 56 Magambazi 56 Maricunga Belt 56 Ngayu 56 bearing quartz vein 56 Thompson Nickel Belt 56 Sekenke 56 paleo placer 56 Chukuni property 56 Commences Drill Program 56 Bouroum 56 Sakoose 56 Salta Province Argentina 56 Cerro Vanguardia 56 Dublin Gulch 56 Cuiu Cuiu 56 Bourlamaque Batholith 56 tungsten mineralization 56 radiometric anomaly 56 Kangaluwi 56 Alto Chicama 56 nickel sulphide mineralization 56 Vaquillas 56 Samapleu Project 56 placer deposits 56 Archaean greenstone 56 Zinc Copper 56 Letitna 56 epithermal vein systems 56 epithermal gold 56 exploration tenements 56 polymetalic 56 skarn deposits 56 grade epithermal gold 56 Lakanfla 56 Tassawini 56 Geologically 56 Casa Berardi Mine 56 Ouzzal 56 polymetallic deposits 56 Niakafiri 56 gold IOCG 56 Muirs Reef 56 Kitongo 56 geologically analogous 56 Kilindi 56 Kalplats 56 Samapleu 56 Xstrata Copper Las Bambas 56 Buffalo Ankerite 56 Superior Craton 56 Huxter Lane 56 Singida Londoni gold 56 Uruachic Camp 56 Nithi Mountain 56 El Torno gold 56 Maricunga Gold Belt 56 Leitch Sand River 56 mineralized showings 56 Los Zorros 56 uranium occurrences 56 polymetallic mineralization 56 Chirano Gold Mine 56 molybdenum deposit 56 F2 Zone 56 Bushveld 56 Guiana Shield 56 gold molybdenum porphyry 56 Porphyry Copper Gold 56 Scadding Gold 56 chromite deposit 56 Rattlesnake Hills Wyoming 56 Pataz 56 Eureka Trend 56 #km# [003] 56 Beluga sapphire property 56 subsidiary Luiri Gold 56 Represa Zone 56 alluvial gold 56 Matsitama Project 56 La Poma 56 Yanacocha Mine 56 Wabassi property 56 Kalumbila 56 prolific Abitibi 56 Hurdman Property 56 porphyry Cu Au 56 Otish Mountains 56 craton 56 Lachlan Fold Belt 56 porphyry copper 56 Polymetallic 56 porphyry copper gold 56 El Creston molybdenum 56 Louvicourt 56 Inmaculada gold 56 Kwanika 56 copper molybdenum silver 56 Kimberlites 56 Gold Mineralization 56 copper molybdenum mineralization 56 Bulyanhulu 56 Destor Porcupine Fault Zone 55 Cu Au Ag 55 lode gold 55 skarn mineralization 55 Cumaru 55 Gurupi 55 greenstones 55 Nkran 55 Hambok 55 garimpos 55 geologically favorable 55 copper sulphide 55 kimberlite diamond 55 molybdenum porphyry 55 El Tambo 55 Uranium Deposit 55 South Tally Pond 55 leachable copper 55 massive sulphide deposits 55 Mactung 55 Mangabal 55 Lapa Mine 55 Eudialyte 55 Kampti 55 Tintina 55 Singida Gold Project 55 Khongor 55 orebody 55 copper molybdenum porphyry 55 Kerr Addison 55 vanadium deposit 55 mineral occurrences 55 Intrusive Complex 55 Las Calandrias 55 soil geochemical anomaly 55 Manzako 55 Buesichem 55 Onaman 55 Urumalqui 55 Macusani uranium 55 Colquipucro 55 epithermal deposit 55 Tulks South 55 nickel sulphides 55 Malambani 55 Nimini Hills 55 Obuasi Property 55 Arae Gassel 55 Moly Dome 55 Orogrande Shear Zone 55 Éléonore 55 Kasala Project 55 El Compas 55 Shirotnaia 55 lode claims 55 Epithermal 55 Constancia copper 55 Waterberg coalfield 55 Tenke Fungurume 55 gold geochemical anomaly 55 Beardmore Geraldton greenstone belt 55 copper mineralization 55 Bombore 55 Cu Zn Au Ag 55 bauxite deposits 55 Buffalo Ankerite Property 55 Mayoko 55 Kenville Gold Mine 55 Shebandowan 55 Rio Novo 55 Hemlo 55 Tintina gold 55 Snowbird Tectonic Zone 55 Sudbury Basin 55 Destor Porcupine 55 Pilunani 55 Pueblo Viejo gold 55 Amaruk property 55 Molybdenite 55 wholly owned Snowfield 55 Batholith 55 Bambari 55 Newmont Ahafo 55 Zafranal 55 Quesnel Terrane 55 Wellgreen 55 James Bay Lowlands 55 Mojave Sonora Megashear 55 Garrcon 55 Molybdenum Copper 55 silver indium 55 Nemegosenda 55 Ga Phasha 55 Nixon Bartleman 55 Cu Zn Ag 55 Dukwe 55 Macusani Plateau 55 Porphyry Project 55 Cerro Chorcha 55 Lamaque Property 55 Ag Pb Zn 55 Archean greenstone belt 55 REE mineralization 55 Clay Howells 55 Sombrero Butte 55 Incahuasi 55 Walsh Katrine 55 Itigi Manyoni Uranium 55 Chirano 55 stockwork vein 55 Kay Tanda 55 volcanic stratigraphy 55 Shebandowan greenstone belt 55 lateritic nickel 55 Los Helados 55 Batong Buhay 55 Tonkin Springs 55 diamondiferous kimberlite pipes 55 Cheowa 55 layered mafic intrusion 55 Tantamaco 55 vuggy silica quartz alunite 55 VMS mineralization 55 Soil Anomaly 55 Lalor deposit 55 Au Cu mineralization 55 Dutwa nickel project 55 gossans 55 nickel laterite 55 Freegold Mountain Project 55 Camino Rojo 55 Shanta Gold 55 Yandera 55 Granduc 55 copperbelt 55 Luisha 55 tenement holdings 55 oxide copper 55 Tajo Vein System 55 Porphyry Copper 55 quartz reefs 54 Batero Quinchia Project 54 surface bulk tonnage 54 magmatic nickel copper 54 Airborne Survey 54 Rossing uranium mine 54 Fayolle deposit 54 Cu Ni PGE 54 South Kawishiwi Intrusion 54 Prospecting Licenses 54 Houndé 54 Asankrangwa gold 54 bearing quartz stockwork 54 Quinchia 54 Cadillac Larder Lake 54 Toodoggone 54 Tintina Gold Province 54 Pequop Mountains 54 auriferous quartz veins 54 Ag Zn Pb 54 Carscallen Township 54 Amazon Craton 54 Belahouro 54 Riviere Dore 54 Stikine Arch 54 Grants Mineral Belt 54 Sua Pan 54 Ag Au 54 Corriente Copper Belt 54 Kobada gold 54 Hotstone 54 Minita deposit 54 Tulameen Project 54 sulphide deposits 54 layered mafic 54 Balandougou property 54 Kivu Graben 54 producing Promontorio Silver 54 unpatented lode claims 54 km2 54 Fruta del Norte 54 unpatented lode mining 54 Portugesas 54 Tarachi 54 Niaouleni Gold Project 54 Aurizona 54 Gold Porphyry 54 Lipena 54 Pivert Rose property 54 mesothermal gold 54 quartz sulphide veins 54 Cerro Moly 54 Bathurst Mining 54 stratabound 54 Gcwihaba Resources Pty Limited 54 Mininko permit 54 metallogenic province 54 Nkout iron ore 54 Nyieme 54 Corani silver 54 Mikwam 54 bearing breccias 54 Goldcliff 54 Tim Mersoi Basin 54 Porcupine Destor Break 54 Gold Intersected 54 volcanogenic massive sulfide VMS 54 Proterozoic rocks 54 Gjegjan 54 low sulfidation 54 Pantanillo 54 Cerro Solo 54 Mongora 54 Witwatersrand basin 54 Ventersdorp alluvial diamond 54 Shear Zone 54 Main Lode 54 Tulu Kapi 54 orogenic gold deposits 54 Plutus prospect 54 grade metamorphic rocks 54 polymetallic veins 54 PGE mineralization 54 Relincho 54 Asumura gold projects 54 Planchas de Plata 54 gold porphyry 54 Gaoua 54 palaeochannels 54 Kansanshi mine 54 Vizcachitas 54 Caballo Blanco 54 VTEM geophysical 54 Rooipoort 54 Doolgunna 54 Akasaba Mine 54 wolframite 54 Victoria Greenstone Belt 54 Vilcoro Gold Property 54 Archean aged 54 Ixhuatan 54 Mwadui 54 Kyzyl Gold Project 54 Sisson Brook 54 La Blache 54 Juina 54 Changkeng 54 Gurthi 54 La Bufa 54 Ventersdorp Diamond 54 McFauld Lake 54 Strateco Matoush 54 porphyry copper mineralization 54 Mwambashi 54 Lupoto 54 overlies 54 Flin Flon Snow 54 Dachang Main Zone 54 Pinaya gold 54 Jujuy Province 54 Pulacayo 54 Au Cu porphyry 54 geological terrane 54 Sierra Madre Occidental 54 Kanosak 54 Buckreef 54 Tapajos Gold Province 54 Copper Zinc 54 Grade Mineralization 54 South Barnat deposit 54 Athabasca basin 54 Brucejack 54 Gawler Craton 54 diorite porphyry 54 Au Ag 54 copper porphyries 54 epithermal 54 Temascaltepec Mining District 54 Sihayo 54 Fougadian Exploration Permit 54 sulphidation epithermal deposits 54 Lavras 54 Ixtaca 54 polymetallic mineral 54 Segala gold 54 Moly Brook 54 Friday Petsite 54 Homase 54 carbonatite complex 54 Massive Sulphide 54 sulphidation gold 54 Uranium Mineralization 54 Tapajos Mineral Province 54 Twangiza Namoya 54 deformation corridor 54 uranium mineralization 54 Proterozoic sediments 54 Yarumalito 54 epithermal deposits 54 situ leach ISL 54 Kiaka 54 Curipamba 54 Kalukundi 54 Obuasi Mine 54 Brookbank Gold 54 Modder East gold 54 Skukum Mineral District 54 metasedimentary rocks 54 massive sulfide mineralization 54 Copper Nickel 54 Airborne Geophysical Survey 54 Cassiar Gold Camp 54 Destor Porcupine Fault 54 nickel laterite mineralization 54 mineralized breccias 54 Turquoise Ridge 54 gold mineralization 54 Rare Earth Element 54 Frankfield Project 54 Fofina 54 Siguiri Basin 54 VTEM anomaly 54 Tengrela 54 Goz Creek 54 mineralized quartz veins 54 Marra Mamba 54 quartz stockworks 54 #km# [004] 54 banded iron 54 Handeni Gold Trend 54 Proterozoic age 54 kimberlite dykes 54 bulk tonnage 54 Warmbad 54 Buritica 54 Schefferville Gold 54 Adumbi 54 Val d'Or Malartic 54 Kinyambwiga 54 Rooderand 54 underexplored 54 Siribaya Mega structure 54 Porcupine Destor 54 Boikgantsho 54 Angilak Project 53 Husab 53 Gounkoto 53 Kunche 53 Mafic 53 Banded Iron Formation 53 Cadillac Break 53 Sakoa 53 Basin Gulch 53 La Yagua 53 Maricunga gold 53 Picachos 53 Cerro Prieto 53 Denton Rawhide Mine 53 Chalchihuites 53 Otjikoto gold 53 Chaucha 53 epithermal mineral 53 Accha deposit 53 Riscos de Oro 53 Wachigabau 53 Onaman properties 53 Macassa mine 53 Drilling Confirms 53 Goldpines North 53 Bepkong 53 ENE trending 53 Hassai 53 Matoush fault 53 Macusani Uranium District 53 Kenieba 53 Drilling Extends 53 kimberlite dyke 53 Sabodala 53 Shining Tree 53 bulk minable 53 Aflease Gold Limited 53 Chloride Copper Mine 53 tantalite 53 Venecia lies 53 Sinchao Property 53 Claim Blocks 53 stockwork mineralization 53 low sulfidation epithermal 53 Kilimapesa 53 formation BIF 53 Ghanzi Copper Silver 53 Opinaca reservoir 53 Thelon Basin 53 Dory Pond 53 volcanogenic 53 Big Daddy chromite 53 Ni Cu 53 Cerro Las Minitas 53 Pony Spur 53 Otish Basin 53 grade epithermal vein 53 prospective Deseado Massif 53 mineralized corridor 53 Lumwana mine 53 Segilola 53 Fresnillo PLC 53 Canahuire 53 Kagera Project 53 Las Bolas Los Hilos 53 porphyry copper molybdenum 53 Passendro 53 Guazapares 53 Sadiola Mine 53 La Bufa property 53 molybdenum mineralization 53 Jujuy Argentina 53 zinc mineralization 53 Polymetallic Project 53 Nopalera 53 Gwabe 53 Quartz Claims 53 Destor Porcupine fault 53 nickel PGM 53 Lead Zinc 53 Western Bushveld Igneous 53 mineralized skarn 53 potentially bulk mineable 53 Rondonia Brazil 53 Droujba 53 Moz Au 53 coincident magnetic 53 Mistassini 53 Pico Machay 53 Toroparu gold 53 Marudi Mountain Gold 53 Inaja Greenstone Belt 53 Peppler Lake 53 Heruga copper gold 53 Uravan Mineral Belt 53 La Colosa deposit 53 Veladero gold 53 Cerro Quema 53 intrusives 53 ODM# Zone 53 Haut Katanga 53 prolific Abitibi greenstone belt 53 Roraima Basin 53 porphyry deposits 53 Norlartic 53 Ndablama 53 Kalsaka 53 Cu Mo Ag 53 West Pequop 53 Cerro Casale deposit 53 Pucarana 53 diamondiferous kimberlites 53 mineralized breccia 53 Akanani 53 Sindirgi 53 Swayze greenstone belt 53 underground mineable 53 Terneras Vein 53 Poly Metallic 53 Shirotnaia zone 53 Bulyanhulu gold 53 Copper Molybdenum 53 Aappaluttoq 53 Alluvial Gold 53 Nyanzaga 53 sulfidation style 53 Desmaraisville 53 Pokukrom West 53 Magembe property 53 Malartic Gold 53 chromite occurrences 53 Meliadine West 53 Condor de Oro 53 prospective stratigraphy 53 Obotan 53 pegmatite 53 stockwork breccia 53 Ollachea Project 53 Uzboy 53 near Winnemucca Nevada 53 massive sulphide deposit 53 Cumpie Hill 53 Pb Zn Cu 53 Kena Copper 53 Batoto 53 Kimberlite 53 Mkuju River Project 53 bearing quartz veins 53 Biga Peninsula 53 Cachinal 53 Goldstorm 53 Ossa Morena 53 flagship La Bodega 53 VHMS 53 Heruga 53 artisanal workings 53 open pitable 53 Dutwa 53 magmatic sulphide 53 Pelusa Property 53 Torlon Hill 53 grade bulk tonnage 53 Skukum Creek gold 53 meta sedimentary rocks 53 Webbs Silver 53 Vanadium Titanium Iron 53 Porphyry Copper Project 53 Larder Lake Break 53 mineralized occurrences 53 mineralized outcrops 53 lithium brine 53 Kobada Mali 53 Batouri 53 NNE trending 53 Echandia 53 Chunya 53 Oxide Zone 53 nickel sulphide deposit 53 Kurupung Batholith 53 Zn Pb 53 Bayugo 53 Sunbeam Pettigrew property 53 Quebrada Blanca 53 Manneville 53 Bronson Slope deposit 53 Tabakoto Pit 53 Mina Justa 53 Putu iron ore 53 Serra Pelada Project 53 IOCG deposits 53 NI #-# compliant inferred 53 Thierry Mine 53 Shining Tree gold 53 Yaramoko 53 Zani Kodo 53 Beardmore Geraldton Greenstone Belt 53 Vein Zone 53 Milnet Mine 53 magnetite iron 53 Copalquin 53 alkaline intrusive complex 53 Xstrata Raglan 53 Porcupine Destor fault 53 sericite pyrite 53 EPL# 53 Tabakoto Segala 53 Timmins Porcupine West 53 AK6 diamond mine 53 low sulphidation epithermal 53 El Rayo structure 53 uraniferous 53 Athabasca Basin 53 Copper Mineralization 53 REE deposits 53 Silver Mineralization 53 Promontorio 53 Fermont 53 Ucayali basin 53 Carheil 53 Kaukua 53 Huarochiri Province 52 chromite deposits 52 massive sulphide mineralization 52 palaeochannel 52 Kagem mine 52 Kinyambwiga Gold Project 52 platinum palladium mineralization 52 Hache lens 52 La Colosa 52 Mt Isa Inlier 52 Laterite 52 Zafranal Main Zone 52 Asankrangwa Holdings 52 Whabouchi 52 Otish 52 Potrerillos 52 Zuun Mod 52 Vortex Zone 52 Burnstone Gold 52 Magistral Mine 52 Belleterre 52 Ikungu 52 Pan de Azucar 52 Santa Pancha 52 Salinas Grandes 52 Jumping Josephine 52 Nueva Concepcion 52 Jiama 52 Sinivit 52 kimberlite pipes 52 Andahuaylas Yauri 52 Salta Province 52 Luang Namtha 52 hematite mineralization 52 Group Metals PGM 52 Lanfranchi Nickel Mine 52 Kipoi Central 52 PD1 deposit 52 Duck Pond copper 52 Fenix Project 52 uranium anomalism 52 shear zone 52 Gossan 52 McFauld 52 IP chargeability anomalies 52 Porcupine Destor Fault Zone 52 Eskay Creek mine 52 Sonora Gulch 52 Singida Gold Property 52 Peru Copper Porphyry 52 prospecting licenses 52 Temiscamingue 52 Porphyry Creek 52 Birimian metasediments 52 Cluff Lake 52 Los Pumas Manganese 52 Higo Blanco 52 Aurizon Joanna 52 Sierra Pintada 52 Gongondy 52 open pittable gold 52 geologically mapped 52 Taparko 52 stringer mineralization 52 mineralized envelope 52 diamondiferous kimberlite 52 Tirek 52 Sulfato 52 Geita 52 heap leachable 52 kimberlite pipe 52 Minitas 52 Goldstrike Mine 52 copper molybdenum mine 52 Ventana La Bodega 52 Permo Carboniferous 52 porphyry skarn