 | de Ronde, C. E. J., Spooner, E. T. C., de Wit, Maarten J., Bray, C. J. (1992) Shear zone-related, Au quartz vein deposits in the Barberton greenstone belt, South Africa; field and petrographic characteristics, fluid properties, and light stable isotope geochemistry. Economic Geology, 87 (2) 366-402 doi:10.2113/gsecongeo.87.2.366 | Journal (article/letter/editorial) | | Vol. 87, 1992, pp. 366-402 ShearZone-Related,Au Quartz Vein Depositsin the BarbertonGreenstone Belt, SouthAfrica:Field...recorded:talc-carbonate, quartz-carbonate, fuchsite-quartz-carbonate _ sulfides,and sericite-quartz-sulfides _ carbonate-...minimumscaleof •60 x 10 km andfor phaseseparation on a local(mine)scale.Evidencefor phaseseparation is notedby...dies on alterationminerals associated with the quartz-carbonate _ goldveins(including adjacentwall rock)are...SouthAfrica. 0361-0128/92/1316/366-3753.00 366 BARBERTON GREENSTONE BELT GOLD DEPOSITS 367 b34Ssulfides |  | Markowski, Agnès, Vallance, Jean, Chiaradia, Massimo, Fontboté, Lluìs (2006) Mineral zoning and gold occurrence in the Fortuna skarn mine, Nambija district, Ecuador. Mineralium Deposita, 41 (4) 301-321 doi:10.1007/s00126-006-0062-x | Journal (article/letter/editorial) | | zoning and gold occurrence in the Fortuna skarn mine, Nambija district, Ecuador Received: 24 February 2005...May 2006 # Springer-Verlag 2006 Abstract The Fortuna oxidized gold skarn deposit is located in the northern...northern part of the Nambija gold district, southern Ecuador. It has been subdivided into four mineralized...1 km, which are named from north to south: Cuerpo 3, Mine 1, Mine 2, and Southern Sector. Massive skarn...affects a quartz–diorite porphyritic intrusion which crops out below the skarn bodies in Mine 2 and the |  | | Journal (article/letter/editorial) | | 1•88, pp. 1583-1596 Ore Deposits at the Fresnillo Mine, Zacatecas,Mexico DELFINO C. RUVALCABA-RUIZ PasajeE...basemetal-silverdepositsare zonedto the southeastawayfrom a small quartz monzonitestock,with increasingsilvercontentand...s with increasingelevation. Fluid inclusionsin quartz, calcite, and sphaleritecontaintwo phases,water...surface)level. Introduction hills, Loma de la Fortuna, Cerro Proafio, and Cerro Populo, with reliefs...veins,of which more than 30 ental (Fig. 1). The mine area,immediatelysouthand havebeenmajorore producers |  | Campbell, I. H., Ballard, J. R., Palin, J. M., Allen, C., Faunes, A. (2006) U-Pb Zircon Geochronology of Granitic Rocks from the Chuquicamata-El Abra Porphyry Copper Belt of Northern Chile: Excimer Laser Ablation ICP-MS Analysis. Economic Geology, 101 (7) 1327-1344 doi:10.2113/gsecongeo.101.7.1327 | Journal (article/letter/editorial) | | composite Los Picos-Fortuna–Pajonal-El Abra igneous complex, Radomiro Tomic mine, and Opache prospect...El Abra mine porphyry, is ore bearing. The five units that were dated from the Los Picos-Fortuna complex...activity in the source region of the Los Picos-Fortuna–Pajonal-El Abra igneous complex increased steadily...55 Ma. The five dated units from the Los Picos-Fortuna igneous complex have the same age, within analytical...than the youngest intrusions of the Los Picos-Fortuna–Pajonal-El Abra igneous complex, which makes it |  | | Report (issue) | | Antimony Deposits of El Antimonio District Sonora, Mexico GEOLOGICAL SURVEY BULLETIN 962-B Antimony... Antimony Deposits of El Antimonio District Sonora, Mexico By DONALD E. GEOLOGICAL WHITE and SURVEY...Rincon.________________________________________ La Fortuna-------------_----_--_-__-__---_----___.-_-__-___...___-__________________-_--.--__ Future of the district._____-_--______-______-_______--_-__-_-__-___...and section of the north veins of El Palo Verde mine.______-_____.____________-_-_-__---__--_____ Geology |  | | Report (issue) | | 0000eeceescececscdbeen structural map, or Rico; Colorado, .district: . ..+.5. ssw Fea ive Res five voles ow tod...cureieunertiae ote teers 12 Plan. and section of Sunlight district, Wyoming, 16 4, tires sheik aes ........02+2...Mexico Aenea SmmSCLUCLUTAlEMaprOrsOllyentons district ColoLadoum Ole Generalusectionsthroupheoilyentonidistricte...40 13. Structural map and section, Goldfield district, Nevada................0.eeeeeeee 47 AeA ticliness...Cross¥sections, 32. Block diagram and section, Mogollon district, ONG fal Ress (ec eee en Rear erate nen tteannun |  | Vallance, Jean, Fontboté, Lluís, Chiaradia, Massimo, Markowski, Agnès, Schmidt, Susanne, Vennemann, Torsten (2009) Magmatic-dominated fluid evolution in the Jurassic Nambija gold skarn deposits (southeastern Ecuador) Mineralium Deposita, 44 (4) 389-413 doi:10.1007/s00126-009-0238-2 | Journal (article/letter/editorial) | | epidote and are spatially associated with porphyritic quartz-diorite to granodiorite intrusions. Endoskarn is...and occurs mainly in sulfide-poor vugs and milky quartz veins and veinlets in association with hematite...values between 6.2‰ and 11.5‰ for gold-bearing milky quartz from the retrograde stage suggest that the ore-forming...the evidence for CO2 effervescence and probable local boiling. The dominance of magmatic low-saline to...δ18O values of 0.4‰ to 6.2‰ for fluids depositing quartz (below 350°C) in sulfiderich barren veins. Low-temperature |  | | Journal (article/letter/editorial) | | 240-m-thick quartzite unit of the Pennsylvanian Bingham Mine Formation, extends 170 m from the northeast margin...a thrust fault, below which beds of the Bingham Mine Formation are vertical and cut by abundant northeast-striking...dipping faults, dikes, and isoclinal folds, the Fortuna zone. Ore-forming hydrothermal assemblages in quartzite...Main-stage minerals are predominantly disseminated quartz + phlogopite ± K feldspar, with nukundamite replaced...the Main stage. Latestage assemblages consist of quartz + sericite ± kaolinite with abundant pyrite, lesser |  | | Journal (article/letter/editorial) | | LONG-LIVED HYDROTHERMAL SYSTEM IN THE FRESNILLO SILVER DISTRICT, MEXICO: CONSTRAINTS FROM 40Ar/39Ar GEOCHRONOLOGY...mineralized veins. Oligocene rhyolitic domes and a quartz-monzonite stock also occur in the area, whereas...and dikes are the youngest igneous rocks in the district. Spatial association of Tertiary volcanic rocks...sulfate alteration, and epithermal veins makes the district ideal for evaluating the temporal relations between...04 ± 0.05 Ma. Dating of orthoclase from the Fortuna quartz-monzonite was problematic due to excess argon |  | | Journal (issue) | | they are, Roger Baxter, CEO: Minerals Council South Africa REVEALED P12 Africa's TOP 3 mining destinations...ESG-FOCUSED VALUE PROPOSITION P22 MINING REVIEW AFRICA | ISSUE 1 – 2023 P4 17 20 www.miningreview.com...Roger Baxter, CEO: Minerals Council South Africa REVEALED South Africa Power sector reforms provide glimmer...Phenomenal geology + phenomenal team = phenomenal mine Khoemacau Delivering on expectations, planning the...Goodbye to SA’s true mining veteran MINING REVIEW AFRICA | ISSUE 1 / 2023 1 EDITOR’S COMMENT Chief Executive |  | Ossandon C., G., Freraut C., R., Gustafson, L. B., Lindsay, D. D., Zentilli, M. (2001) Geology of the Chuquicamata Mine: A Progress Report. Economic Geology, 96 (2) 249-270 doi:10.2113/gsecongeo.96.2.249 | Journal (article/letter/editorial) | | 2001, pp. 249–270 Geology of the Chuquicamata Mine: A Progress Report GUILLERMO OSSANDÓN C., CODELCO-Chile...preserved. It is accompanied by granular quartz and quartz-K feldspar veinlets, which contain only trace...bornite remains from this early stage. Fine-grained quartz-K feldspar alteration, with destruction of biotite...deformation and destruction of igneous texture. A band of quartz-K feldspar alteration, up to 200 m wide and 1,500...chalcopyrite-pyrite as sulfide abundance fades out. Sulfides in quartz-K feldspar alteration are abundant only where there |  | | Journal (article/letter/editorial) | | tg4SEMENT Los Loros ALTERATIO_N SlLICIFICATION & Fortuna Grano- ADVANCED diorite,Chua. uicamata ARGILLIC...K r.'.'.'.'.'.'.'.-.-. --I- SURFACE -'11'-+FORTUNA GRANODIORITE • • ........ '/J .,:':':.:.:.:.:-:...that the West Fissure, beyondwhich outcropsthe Fortuna mineralizing fluids ascendedthe West Fissure and...Fissuretestifyto importantmovementalongit subthe Fortuna granodioriteand 29.2-----0.5m.y. for sequentto...active prior to mineralization,and may even for the Fortuna granodiorite. A much older age is have helped to |  | | Report (issue) | | element principally sought were listed by the State Mine Inspector of which four actually produced some gold..................... 23 Eureka district................. 23 Hillside mine ~..............................and Dexter mine................................................................ 25 Cowboy mine........................ 26 Crosby mine 26 Southern Cross mine 27 Mammoth or Hubbard mine................................................. 27 Prescott district 28 Bullwhacker mine.................................... |  | Chiaradia, Massimo, Vallance, Jean, Fontboté, Lluis, Stein, Holly, Schaltegger, Urs, Coder, Joshua, Richards, Jeremy, Villeneuve, Mike, Gendall, Ian (2009) U–Pb, Re–Os, and 40Ar/39Ar geochronology of the Nambija Au-skarn and Pangui porphyry Cu deposits, Ecuador: implications for the Jurassic metallogenic belt of the Northern Andes. Mineralium Deposita, 44 (4) 371-387 doi:10.1007/s00126-008-0210-6 | Journal (article/letter/editorial) | | Pangui is a recently discovered porphyry Cu–Mo district. The geology of the Subandean zone in southeastern...veins postdating gold deposition) of the Nambija district are all indistinguishable from each other within...Chapleau Resources Ltd., Suite #104, 135-10th Avenue South, Cranbrook, BC V1C 2NI, Canada 372 obtained on...minerals. The new Jurassic age for the Nambija district is slightly younger than the 40Ar/39Ar and Re–Os...magmatic–hydrothermal minerals from the Pangui district, which range between 157 and 152 Ma. Mineralization |  | | Report (issue) | | Laguna, and Chocolate Mountains ............... 11 Fortuna basin .............................. 15 Picacho-Bard................ Gravity profile A-A' across the Fortuna basin from DH-25 to the Gila Mountains ................... Resistivity profile a-a' across the Fortuna basin along the southerly international boundary............. Seismic-refraction profile 8 on the south flank of the Yuma basement high ..................trough west of the Gila Mountains, designated the Fortuna basin, that is estimated to contain about 16,000 |  | | Report (issue) | | Gavilanes Tungsten District El Antimonio District Magdalena District Cananea District Preliminary Deposit-Type...and occurrences in Sonora, North Baja California, South Baja California and the northern part of Chihuahua...or to a group of closely-spaced deposits. Two district records have been included (MX00018 and MX02161)...or names of individual orebodies. DISTRICT/AREA Informal district name used in the literature. Names...located: Sonora, North Baja California (NBAJA), South Baja California (SBAJA), or Chihuahua. LATITUDE/LONGITUDE |  | Correa, Karen J., Rabbia, Osvaldo M., Hernández, Laura B., Selby, David, Astengo, Marcelo (2016) The Timing of Magmatism and Ore Formation in the El Abra Porphyry Copper Deposit, Northern Chile: Implications for Long-Lived Multiple-Event Magmatic-Hydrothermal Porphyry Systems. Economic Geology, 111 (1) 1-28 doi:10.2113/econgeo.111.1.1 | Journal (article/letter/editorial) | | cluster expand the mineralization period in the district up to ~1.0 m.y., suggesting a multistage, long-lived...basin Radomiro Tomic Chuquicamata Potrerillos Quartz-sericite zone Lineaments U-Pb Ages Re-Os Ages ...Clara granodiorite Rojo Grande granite Equis quartz-monzodiorite Central diorite EXPLANATION Dark...of the El Abra mine, with sample locations. Projection: UTM19; Datum: Provisional South America 1956 (PSAD56)...fault system. Modified from an unpublished El Abra mine map. EA-710 EA-657 EA-6 EA-1284 22° S Pacific |  | Barra, Fernando, Alcota, Hugo, Rivera, Sergio, Valencia, Victor, Munizaga, Francisco, Maksaev, Victor (2013) Timing and formation of porphyry Cu–Mo mineralization in the Chuquicamata district, northern Chile: new constraints from the Toki cluster. Mineralium Deposita, 48 (5) 629-651 doi:10.1007/s00126-012-0452-1 | Journal (article/letter/editorial) | | porphyry Cu–Mo mineralization in the Chuquicamata district, northern Chile: new constraints from the Toki...Opache porphyry Cu–Mo prospects, is located 15 km south–southwest of the Chuquicamata–Radomiro Tomic mines...of the Collahuasi Group and intrusions of the Fortuna–Los Picos Granodioritic Complex. Hypogene mineralization...Sericitic alteration is relatively restricted to late quartz–pyrite veins (D-type veins). Previous K–Ar geochronology...period of several million years in the Chuquicamata district. Introduction Chile is the major copper producer |  | | Journal (issue) | | honored by The American Association for State and Local History (Desert, Jan., '56, page 28) for her distinguished...cause of making Americans better aware of their local history. She is the Southwest's top travel writer...MARCH, 1966 Volume 19 COVER LETTERS CALENDAR LOST MINE WILDFLOWERS EXPERIENCE NATURE INDIANS TRUE OR FALSE...hiked so many times between the Red Cloud and La Fortuna mines in the Yuma, Arizona, area. But, somewhere...dirty quartz cropping out beside a palo verde tree—or the ghost of a polo verde—remains—dirty quartz, rich |  | | Book (volume) | | Cover Photo: Chapter 20. 10 La Caridad Copper Mine, I. Salas, Guillermo P. 90-28579 ■ Sonora. 98765432...mineral deposits of the El Boleo copper mine, Santa Rosalia district, Baja California Sur . Ivan F. Wilson...Topia Mining District . H. Monje H. 215 23. Geology of the Tayoltita Mine, San Dimas District, Durango... Economic geology of the Santa Eulalia Mining District, Chihuahua . D. Maldonado E. 241 24. Economic...Economic geology of the San Martin Mining District P. Olivares R. Contents V 27. Geology and mineralization |  | | Journal (article/letter/editorial) | | oxidation state. This study is based on the Los Picos-Fortuna/Pajonal-El Abra igneous complex, a suite of spatially...of the correlative Los Picos-Fortuna intrusive suite. The Los Picos-Fortuna/ Pajonal-El Abra complex was...responsible for deformation along the western margin of South America. Changing patterns of stress have led to...Chuquicamata-El Abra belt, forming part of the north-south-orientated Domeyko Fault System which extends for...Dilles et al. 1997; McInnes et al. 1999). Los Picos-Fortuna and Pajonal-El Abra igneous suites Fig. 1 Map |  | Skirrow, R.G, Camacho, A, Lyons, P, Pieters, P.E, Sims, J.P, Stuart-Smith, P.G, Miró, R (2000) Metallogeny of the southern Sierras Pampeanas, Argentina: geological, 40Ar–39Ar dating and stable isotope evidence for Devonian Au, Ag–Pb–Zn and W ore formation. Ore Geology Reviews, 17 (1) 39-81 doi:10.1016/s0169-1368(00)00004-4 | Journal (article/letter/editorial) | | sulfide–quartz veining in the El Guaico district Ž386 " 4 Ma, sericite., and W-bearing quartz vein mineralization...Ag–Pb–Zn and W ore-forming fluids, calculated from quartz, white mica and chlorite isotope ratios, range...Present address: School of Geology, University of New South Wales, NSW 2052, Australia. 2 Present address: 13...metal mineralization. A large number of Au-bearing quartz vein and Ag–Pb–Zn vein deposits have been mined...Ni–Cu Au " Ag " Cu veins Ag–Pb–Zn veins Wolframite–quartz veins Disseminated scheelite in calcsilicates and |  | | Journal (article/letter/editorial) | | 164'2-1646 K-Ar Age Studiesin the Fresnillo Silver District, Zacatecas,Mexico BARBU LANG, GIDEON STEINITZ...latteraresomeofthemoreimportantorebodies of the Fresnillo district. The K-Ar measurements demonstrate an evolvingpatternof...betweenintrusivemagmatism and metallization in the Fresnillo district. Introduction (1925), Stone and MacCarthy (1948)...a cylindrical quartz monzonitethat is approximately60 m in diin the Fresnillo district. ameterfoundat...approximately1,000 m District Geology belowsurface.At surfacethisbodyis very poorlyexThe Fresnillo district is located |  | | Book | | El Antimonio District Cananea District ...... Arizpe District ........... Nacozari District ...... Moctezuma...Moctezuma District ... Hermosillo District ... Alamos District ........ San Bernardo Area Alistos District...SECTION 2 — Highway 45 Sabinal District ............... Los Lamentos District.... Placer de Guadalupe Puerto...Aire District Chihuahua .......................... Santa Eulalia District....... El Potosi Mine........Antonio Mine....... Cusihuiriachic District..... Barranca de Cobre (Copper Canyon) Batopilas District Strip |  | | Report (issue) | | describes his recent visits to a small former fluorite mine 2.5 kilometers north of the village of Mihalkovo...border with Greece. Until its closure in 1994 this mine produced fluorite for industrial uses, and, it seems...calcite, from the Broken Hill mine, Aggeneys, Northern Cape Province, South Africa. Have I ever pictured one...cm, from the Broken Hill mine, Aggeneys, Northern Cape Province, South Africa. Via Mineralia specimen...transparent, deep purple cubic crystals on drusy quartz, in some cases with platy white barite crystals |
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