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(Click for frequent words.) 71 Au oz 70 tonne milled 69 Tonnes milled 69 Ore milled 67 mill throughput 67 Ag oz 67 Ore milled tonnes 67 -Rancont 66 -www.st 66 - -SCRT 66 Cozamin 66 tonnage milled 66 Au eq 65 WO3 65 metallurgical recoveries 65 -Whitsunday Regional 65 ore mined 65 Au eqv oz 65 #.#/tonne [001] 64 -Microsoft Expression Blend 64 Huaron 64 -#YO 64 Minesite costs 64 -Muttitt 64 Cu Eq 64 -Amir Maftah 64 Beaufor Mine 64 stockpiled ore 64 -gasline 64 Ore mined 64 NiEq 64 -Phranakorn Center 64 oz.Au 64 oz Ag 63 -Rassbach 63 Au Eq 63 -Horntvedt 63 Ore Mined 63 -Maddur 63 crusher throughput 63 -Inkpop 63 -annual OzFest 63 -Gody 63 #.#/oz Ag [002] 63 Ag Eq 63 Fazenda Brasileiro Mine 63 #.#/oz Ag [001] 63 Tonnages 63 Au eqv 62 Ounces produced 62 Probable Mineral Reserves 62 Gold Eq 62 #.#Moz [001] 62 Quiruvilca 62 Tonnes Cu 62 Kalsaka Gold 62 oz Au 62 Chapada 62 AuEq 62 cathode copper 62 Lac Herbin gold 62 #.#gpt [001] 62 Pt + Pd 62 Ag Eq Oz 62 Tonnes Au 62 Bouchard Hébert 62 -auroral oval 62 -OF CERTAIN 62 #.#/lb Zn 62 Category Tonnes 62 - -WMGK 62 tonnage mined 62 Mochito 62 - -DEA informant 61 Silver Equivalent 61 -stephen lawson@idg.com 61 Copper cathode 61 Kiniero 61 Gold Equivalent Ounces 61 -Arabica Coffee 61 #koz [002] 61 lb Cu 61 #koz [001] 61 INFERRED 61 Grade Ounces 61 Fazenda Nova Mine 61 Myra Falls 61 floatation mill 61 #.#/tonne [003] 61 Tonnes Au g t 61 gm Au 61 #.#g Ag t 61 g t Au eq 61 -semitransparent 61 flotation concentrates 61 #.#kg t 61 Zinc Concentrate 61 Tons milled 61 Ag eq oz 61 #.#/lb molybdenum 60 Toqui 60 #.#/lb Cu 60 Ag Eq oz 60 4E PGM 60 -Jerry Seinfield 60 #.#Moz [003] 60 heap leach operation 60 -Antieau 60 tonne Au 60 -Bisque 60 -player Flo Hyman 60 TCu 60 Heap Leach 60 gAu tonne 60 oxide ore 60 #g t Ag [002] 60 -Expandable Memory 60 U#O# U#O# 60 -Roadway Inn 60 Total Contained Metal 60 #.#/lb Pb 60 #/oz Au [002] 60 MoO3 60 Probable Reserves 60 CuT 60 Yauliyacu 60 #,# g t 60 gm t 60 -WINE SHOP 60 PGM ounces 60 Wassa HBB 60 Pyhasalmi 60 Cozamin Mine 60 Updated Feasibility Study 60 Inferred Category 60 -ARE NOT INTENDED TO 60 Q4 F# 59 concentrator throughput 59 -original Hitlist 59 flotation concentrate 59 Mineral Resource estimates 59 Bogoso sulfide processing 59 Deno Gold 59 #.#Mt [001] 59 -center fielder A.Jones 59 Silver Eq 59 - -Eakring 59 Tonnes Milled 59 Podolsky Mine 59 Cyanidation 59 Boroo 59 oz Au ton 59 oz pa 59 -Neurotrauma 59 #.#Mlb [001] 59 Sahavaara 59 Akwaaba Deeps 59 mined ore 59 copper cathode 59 koz 59 Grade Contained 59 vanadium pentoxide V#O# 59 -AutoSkill International 59 Ounces -Recipe Chicken 59 minesite costs 59 -Simeulue Island 59 Cosmo Deeps 59 AngloGold Ashanti Titiribi 59 Pahtavaara 59 #.#/BOE [002] 59 CuEq 59 Ore Reserves 59 Au g t 59 #.#Moz [002] 58 oz Pt 58 #.#/lb Ni 58 Tonnes Grade 58 Ambrex 58 Zun Holba 58 Porcupine Joint Venture 58 R# #/kg [003] 58 -Waie 58 platinum palladium rhodium 58 lb U#O# 58 -Furniture Sharehouse 58 #/lb U#O# 58 Cu Equivalent 58 Taparko Bouroum 58 Cayeli 58 ULV PCI 58 Indicated Category 58 inferred ounces 58 m@#.# g t [004] 58 PGM ounce 58 Preliminary metallurgical 58 dmt 58 Amapari 58 #.#/lb Mo 58 ounces Ag eq 58 #.#Mlbs U#O# [001] 58 -Brandon Fincher community@laurelleadercall.com 58 Tapuli Stora Sahavaara 58 Million ozs 58 tonnes@#.# % [003] 58 Contained Metal 58 #Moz 58 #ppm U#O# 58 oxidized ore 58 #.#Mt @ [003] 58 Lagunas Norte 58 Pallancata Mine 58 2Mtpa 58 % Nb#O# 58 Operating Costs 58 mineable reserve 58 -Dropper 58 Tanjianshan 58 Gold Equivalent 58 ton milled 58 % CuT 58 g.Au t 58 Damang 58 Mine Bucko 58 Kulu copper 58 Metallurgical recoveries 57 adit sampling 57 + Pd g t 57 g t grammes 57 #.#Mlbs 57 cyanide extraction 57 -Shadowbend Place 57 Au Equivalent 57 % WO3 57 flotation circuits 57 Paracatu 57 Kuriskova 57 - -Billeaudeau 57 pyrite concentrate 57 -dwayne tingley 57 g t Moz 57 #.#/Mcfe 57 -6News Jennifer 57 g t AuEq 57 R# #/kg [002] 57 -Nach dem 57 -TM microdisplays 57 Inferred mineral resource 57 Emba Derho 57 - -Rosseau Asset Management 57 -OLD MAN 57 Metallurgical testwork 57 Copper Equivalent 57 - -Hochschule für Musik 57 Rare Earth Oxides 57 Silverstreams 57 Nb#O# 57 Seabee mine 57 Resource Estimate 57 ounces AuEq 57 La Colorada mine 57 #/oz Ag 57 eU#O# 57 Brule Mine 57 % Cu Eq 57 JORC Code compliant 57 -ActivClient 57 Indicated mineral 57 saprolite ore 57 sulphide ore 57 El Toqui 57 Indicated Inferred 57 excluding Alumbrera 57 -Dikpati 57 Mineral Resource Statement 57 per tonne gpt 57 % Cu #.#g 57 tonnage throughput 57 Cu Ag 57 #oz [002] 57 oz Au t 57 g Ag 57 Payable Metal 57 Probable Mineral Reserve 57 3PGE + Au 57 #.#g t [006] 57 Au t 57 Pt g t 57 #.#/lb copper 57 -Pincetich 57 Kinsevere 57 -Kozeny extradition 57 Measured Resources 57 Niobec 57 Akdala 57 Cantung Mine 57 sulphide ores 57 US#/oz 57 proposed Bonanza Ledge 57 cpht 57 #.#g t silver [004] 57 4E ounces 57 AgEq 57 - -Vijitr 57 grammes tonne 57 per MCFE 56 Yatela 56 -Matt Marcewicz 56 zinc #.#g t 56 vat leaching 56 Q2 F# 56 gAu t 56 tantalum oxide 56 V#O# 56 Ozs 56 acid soluble 56 Indicated Resource categories 56 Contained Contained 56 ounces 4E 56 Antapite 56 #.#Mlb [002] 56 Pampalo 56 -Amrut 56 Platinum Pt 56 #.#/BOE [001] 56 Kiena mine 56 Adjustments Inventory 56 -Comitan 56 heap leach processing 56 #,#-#,# oz 56 Grade oz ton 56 ore grading 56 Undiscounted 56 1g t 56 tpd 56 ore 56 Ag Au 56 Infill Drilling 56 Heap leach 56 pounds U#O# 56 Indicated Resources 56 Pre Feasibility Study 56 ore grades 56 tantalum pentoxide 56 Colihues 56 Goldex 56 -Hisarcıklıoğlu 56 #,# lb 56 -ist verse 56 Metallurgical Testing 56 Mt@#.# % [001] 56 Mutoshi 56 Overburden removal 56 Adi Nefas 56 ROM pad 56 El Mochito 56 sulphide concentrate 56 Bulk sampling 56 ozs 56 -Chateau Indage 56 #/ounce [003] 56 testwork 56 LaRonde 56 Lac Herbin 56 leach recoveries 56 -Routledge #/#/# 56 Ounces Produced 56 #.#Mtpa 56 g t Ounces 56 #,#,# tonnes@#.# g [002] 56 oz Au yr 56 refractory ore 56 JORC compliant Inferred Resource 56 Brocks Creek 56 Colquijirca 56 ppm U#O# 56 4E oz 56 hole FC# 56 Eugene Puritch P.Eng 56 caustic fusion 56 -Don Freiday 56 South Minita 56 -PXI PCI USB 56 Au equivalence 56 Refined zinc 56 Prefeasibility Study 56 Newmont Midas 56 ounces Moz 56 #.# oz Au 56 PGM oz 56 -Siwa oasis 56 Ounces Tonnes 56 5g t 56 tonnes grading #.#g t [001] 56 Q3 F# 56 ozs silver 56 -Shankey 56 updated Mineral Resource 56 Quebrada Blanca 56 metallurgical testwork 56 Normalized EBITDA 56 Piaba 56 #.#gpt gold [001] 56 Indicated Resources grading 56 Mlbs 56 #.#Mt grading [002] 56 grade stopes 56 gold equivalent AuEq 55 El Penon 55 La Coipa 55 1Moz 55 #.#Mt [005] 55 ozs Au 55 oxide ores 55 residual leaching 55 Partially offset 55 Dolores Mine 55 Niobec mine 55 averaging #.#g t [001] 55 Drill Hole Results 55 Molybdenum Mo 55 Varvarinskoye 55 #.#gpt [004] 55 Q1 F# 55 #.#g Au t [002] 55 Sulphides 55 tonnes@#.# g t [002] 55 Summarized Results 55 Kubaka 55 Million Ounces 55 heap leachable 55 NI #-# Compliant 55 -Rainer Bonhof 55 Bucko Lake Nickel 55 #.#g/tAu 55 -Erdos TCH 55 - -Ascaron 55 Mt@#.# g t [001] 55 + Pd + 55 Wodgina 55 % TCu 55 South Inkai 55 #-#/oz 55 Metallurgical coal 55 Probable Reserve 55 Seabee Mine 55 Poracota 55 Hassai 55 #Mt grading [001] 55 #.#g t silver [001] 55 Lac des Iles 55 Turmalina 55 Indicated Resource category 55 Kiena 55 Resource Estimation 55 Indicated Resource 55 Namoya 55 Ag g t 55 Tonnes Grade g t 55 #-#,# ounces 55 #g t Ag [001] 55 % MoS2 55 -ALBANY NY AP/# WINS 55 Ag eq 55 copper #.#g t [002] 55 #.#g t Pd 55 Y#O# 55 -OptiPlex FX# 55 mineable resource 55 gm tonne 55 -Terrence McNally Frankie 55 g t Aueq 55 downhole radiometric logging 55 -vs. Sonjay Dutt 55 NI #-# Mineral Resource 55 tonnes@#.# % [001] 55 US#.#/lb 55 #.#M ounces 55 Tonnes Ni 55 #m grading #.#g [002] 55 Per boe 55 heap leach pad 55 Marban Block 55 - -Glas Securities 55 - -Sam Cammack 55 #.#Mt [003] 55 Luismin 55 -Textron Six Sigma 55 #oz [003] 55 MBoe 55 % copper #.#g 55 Twangiza 55 lbs Cu 55 vanadium pentoxide 55 Langer Heinrich 55 HREO TREO 55 Operating netbacks 55 Mineral Reserve 55 oz ton Au 55 flotation tailings 55 g t Au Ounces 55 Ounces 55 tonnes@#.# g t Au [002] 55 TSX VENTURE CXD FRANKFURT 55 Per Ton 55 potentially mineable widths 55 paste backfill 55 sulphide flotation 55 Mineral Resource estimate 55 -Fertile Hope 55 Wattle Dam 55 Choco Mine 55 agitated leach 55 Definitive Feasibility Study 55 Sadiola 55 -Albert Pujols Yadier Molina 55 La Libertad Mine 55 -adjacent Ubaydi 55 Classification Tonnes 55 Alumbrera 55 5Mt 55 oz t Au 55 silver dore 55 #.#Mlbs U#O# [002] 55 Early Joli Fou 55 #ppm U 54 #,# ADMTs 54 lithium carbonate equivalent 54 North Lanut 54 tonnes@#.# % [002] 54 Miguel Auza 54 Aranzazu Project 54 Saprolite 54 Brucejack Area 54 #m@#.# g t Au [007] 54 Levack Complex 54 Youga Gold Mine 54 Golouma South 54 #.#g t Ag [001] 54 -SatMAX R 54 -Gudger 54 UG2 54 -Salon Rebecca Traister 54 Piedras Verdes 54 -MOSAID Technologies 54 Ag Pb 54 #.#g t Au [001] 54 flotation concentrator 54 Q#/# Q#/# Q#/# Q#/# [001] 54 silver equivalent AgEq 54 Fabricated Products segment 54 lithium oxide 54 Dioulafoundou 54 Sleeping Giant mine 54 nickel Ni 54 heap leach 54 floatation circuit 54 Natural Gas MMcf 54 Inferred Resources 54 Caeté 54 Scoping Study 54 reassayed 54 Palladium Pd 54 Pd Pt 54 PGM 4E 54 Soledad Dipolos 54 CAPITAL EXPENDITURES 54 Ciresata 54 Wardrop Engineering Inc. 54 Bucko Mine 54 Dios Padre 54 g t Pd 54 SX EW processing 54 Guelb Moghrein 54 ion ion 54 - -ceremoney 54 NYSE Amex BRD 54 #.#g Au t [003] 54 Mt@#.# g t Au [002] 54 macrocrystic 54 #,#,# Ag eq 54 lbs U#O# 54 #.#/lb nickel 54 Li# 54 Gwabe 54 #.#/oz silver 54 Franke Mine 54 #m@#.#g t Au [004] 54 grading #.#g t [002] 54 Platinum oz. 54 #.#g t silver [003] 54 Probable Ore Reserves 54 Jundee 54 zinc indium 54 Scott Wilson RPA 54 Great Noligwa 54 #.#g t silver [002] 54 Rhenium Re 54 Gold oz. 54 #m@#.#g t [001] 54 troy oz 54 Equiv 54 #.#/lb [004] 54 Rosebel mine operated 54 Atikwa Lake property 54 Costs Per Ounce 54 metallurgical 54 Taparko Bouroum Gold 54 acid leached 54 magnetite concentrate 54 cyanidation 54 ppm U 54 - -Sobe Samsung Honda 54 - -stories contradicted Silsby 54 #.#g t [001] 54 Separation DMS plant 54 tpa nickel 54 -Nasdaq ZRAN 54 Price Per Ton 54 tonnes grading #.#g t [002] 54 lbs eU#O# 54 Preliminary Assessment 54 Sleeping Giant gold 54 Tom Gully 54 flowsheet 54 Ounces Au 54 Underlying EBIT 54 Mt@#.# g t Au [001] 54 -CANMET Energy 54 Kerekounda 54 Grams Per Tonne 54 Peñasquito 54 Bogoso Prestea 54 Mount Polley 54 La Colorada 54 #m@#.#g t [004] 54 Inferred resource 54 leachability 54 Fabie Bay 54 4g t 54 leucoxene 54 Inferred 54 Manganese ore 54 Updated Resource Estimate 54 PROBABLE RESERVES 54 Big Hurrah 54 -Lighting Designers 54 leach pads 54 Drill composites 54 tr oz Au 54 hypogene 54 Production Volumes 54 Minita deposit 54 meters grading #.#g [002] 54 tpd mill 54 g t 4E 54 Palladium oz. 54 Lomas Bayas 54 Frac Sand 54 Sulfide 54 Terrane Mt 54 oz. 54 KDH# [001] 54 Klipdam 54 - -Brigadier General Erv Lessel 54 Osisko Releases 54 #/oz Au [001] 54 Crixas 54 Kutcho Project 54 mined varying 54 Measured Resource 54 Twangiza Main 54 #.#g t [004] 54 GROSS LOSS 54 Pt Pd Au 53 #g t [003] 53 -Jeffrey Sonn 53 -#:# GMT/# 53 Lac Pelletier 53 Kutcho 53 UG2 Reef 53 Frasers Underground 53 Six Months Ended -Norlo Park 53 metres@#.# % [002] 53 AND FINANCIAL DATA 53 - -Valio La Pena 53 molybdenum sulphide 53 oz st 53 MTPY 53 Kiniero mine 53 Ming Mine 53 JORC Inferred Resource 53 Met Chem 53 #ktpa 53 maiden JORC resource 53 Estimate Estimate 53 Rosebel royalty 53 AuEq g t 53 ppm eU#O# 53 Manantial Espejo 53 R#/kg [001] 53 Mineable 53 Pt Eq 53 Dikulushi 53 tonnes grading #.# 53 tungsten concentrate 53 Union Reefs 53 NET INCOME FROM CONTINUING 53 PGM recycling 53 Alamo Dorado 53 La Guitarra Mine 53 Mala Noche Footwall Zone 53 % P#O# 53 Niakafiri Southeast 53 -Physical Therapist Assistant 53 Metallurgical Recoveries 53 3Mtpa 53 Supergene 53 Metallurgical Testwork 53 process flowsheet 53 #.#gpt [002] 53 Mt@#.# % [002] 53 manganese alloys 53 Berezitovy 53 Fosterville mine 53 Tirisano Diamond Mine 53 -about.me 53 - -Linda Shrieves Orlando Sentinel 53 Leaching 53 metric tonne g t 53 meters grading #.#g [001] 53 #.#Moz [004] 53 Fazenda Brasileiro 53 g t 53 solvent extraction electrowinning 53 Kospi vein 53 inferred resource estimate 53 Snowfield Project 53 Zn Ag 53 Balcooma 53 mtu 53 Refugio Mine 53 Hypogene 53 Prestea Underground 53 -Amaka Anajemba 53 Measured Mineral Resource 53 unabsorbed fixed overhead 53 = Tb#O# 53 Shituru 53 #oz [001] 53 Miguel Auza mill 53 insitu 53 Bulk Sampling 53 inferred tonnes grading 53 PDP MLR 53 tpd throughput 53 Topia Mine 53 Sorowar 53 SX EW plant 53 #.#Mt [002] 53 Kinsevere Stage II 53 Hannukainen 53 Naica mill 53 Tonnes Grade Ounces 53 #/lb Mo 53 #,#-#,# ounces 53 Indicated categories 53 BCTMP 53 Ciresata deposit 53 CSH Gold 53 Kenge Target 53 Bulk Sample 53 #m@#.#g t Au [003] 53 dore 53 averaging #.#g t [003] 53 Gold Intersected 53 Maimon Mine 53 - -opera Wozzeck 53 -Addis Ketema 53 openpit 53 Dy#O# 53 #.#Â [001] 53 Pallancata silver 53 Chapada mine 53 gpt silver 53 Akdala Uranium Mine 53 ppm Pb 53 -Andrea Seabrook 53 Endako Mine 53 g t PGM 53 Indicated Mineral Resource 53 GENERAL AND ADMINISTRATIVE 53 Inferred Resource estimate 53 macrodiamonds 53 TSX ARG Amerigo 53 hole MJV 53 Malundwe 53 Flow Through Financing 53 ZrO2 53 metallurgical testing 53 Moz Au 53 GBM Minerals 53 Cu Ni 53 per mcfe 53 Tonnage 53 mboe d 53 t Au #.#g t [001] 53 SX EW copper 53 Stora Sahavaara 53 -David# 53 zinc sulphide 53 #.#/lb U#O# 53 molybdenum 53 Mineral Resource Estimate 53 Merensky reef 53 Cu lb 53 Xstrata Nickel Australasia 53 Luiri Hill 53 Tiriganiaq deposit 53 - -URBAN THOUGHT 53 -Norvic 53 -Shalinda Glass 53 - Gross Profit [004] 53 #.#/US [001] 53 Barreal Seco 53 Chapada Mine 53 -Chuck Knoblauch CJ Nitkowski 53 Mantoverde 53 ounce Akyem 53 Albras 53 Silver Equiv 53 Bokoni 53 #Mt [002] 53 Niobium 53 Irokinda 53 Oxide Mill 53 @ #.#g t [002] 53 -Pagtakhan 53 Paracatu expansion 53 Contained Ounces 53 Tonnage Grade 53 tons@#.# [001] 53 Mineral Resource Estimates 53 Cata Clavo 53 niobium oxide 53 excluding depreciation depletion 53 Hycroft Mine 53 Diamond Drill Holes 53 JORC resource estimate 53 Pardoo DSO 53 Mareesburg 53 g mt 53 minesite 53 zinc MZN3 53 UG2 ore 53 g t Ta 53 Indicated resource 53 near Wabowden Manitoba 53 Azulcocha 53 Mineral Resource Summary 53 GSR1 53 tungsten tailings 53 Kansanshi 53 #.#g Au t [005] 53 Q#/# [001] 53 grading #.#g t [001] 53 SX EW 53 Guanajuato Mine 53 produce #,#-#,# ounces 53 Rosebel gold 53 % TOTAL AVAIL 53 Dombraly 53 Metre Diamond 53 molybdenum oxide 53 -Eden Monaro 53 Proved + 53 bulk sampling 53 #ppm Cu 53 South Barnat 53 GSR2 53 grams tonne 53 cmg t 53 LaRonde II 53 #.#m grading #.#g [001] 53 Lockerby Mine 53 Daneros 53 Non GAAP adjusted EBITDA 53 assay intervals 53 mine LOM 53 oxide sulphide 53 WEIGHTED AVG 53 #.#/oz Au 53 Mineral Resource 53 Manibridge 53 - -fascist regimes 53 3g t 53 Compania Minera Antamina 53 Santa Pancha 53 CIM compliant 52 - -Distribution BULLETIN DATE 52 heap leaching 52 Mana Mine 52 geostatistical methods 52 Maybrun 52 CEZinc 52 Gossan Hill 52 leach extraction 52 #g t Au [002] 52 Cr Fe 52 La Encantada Silver 52 Lac Herbin mine 52 Crowflight Announces 52 Q4 #F 52 Santa Eduviges mine 52 income teb 52 mined ores 52 Initial Resource Estimate 52 -PORR 52 milled Non GAAP 52 copper cathode output 52 Inata 52 #g t Au [001] 52 #m@#.#g t [002] 52 La Parrilla Silver 52 MoS2 52 g tg tg tg 52 Lobo Marte 52 3E PGM 52 averaging #.#g t [002] 52 Saprolite mafic intrusive 52 Expenses Incentive 52 TSX BWR 52 ppm Ag 52 FeV 52 Platosa 52 Q#/# Q#/# [001] 52 tU 52 Meliadine West 52 nickel concentrator 52 Animas Vein 52 #/oz [001] 52 Minera Andes announces 52 Rare Earth Oxides TREO 52 Morococha 52 #.#g t gold [005] 52 Holpan 52 Fosterville Gold 52 tungsten WO3 52 Rosebel 52 oxides TREO 52 caustic fusion diamond 52 Mineralized intercepts 52 #.#/lb [002] 52 -Powerstream 52 Aguablanca 52 gr t Au 52 Nalunaq 52 METAL PRICES 52 tonnes grading #.#g Au [003] 52 minable reserve 52 crusher conveyor system 52 Merensky Reef 52 Huarabagoo 52 vanadium V#O# 52 -Krefeld Germany 52 ROM ore 52 Turnagain deposit 52 Measured Mineral Resources 52 #-# compliant mineral 52 EAF dust receipts 52 OPERATING AND 52 Zinc Lead 52 ppm cobalt 52 Kobada Mali 52 Bisha Main 52 PT FI 52 Stratmat properties near 52 microdiamond 52 Kinross Kupol 52 SENET 52 ZAR#.# [007] 52 #.# oz ton 52 Kinsenda 52 depreciation depletion 52 Nariin Sukhait 52 Tonnes g t 52 Mineral Reserves 52 #g t [001] 52 Metric Ton 52 Refined platinum 52 variography 52 Probable reserves 52 Chromite 52 #.#g t Au [006] 52 YTD YTD 52 mineable widths 52 opencut 52 #m@#.#g t [003] 52 tungsten WO 3 52 -human papilloma viruses