 | | 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...and sphalerite after calcite, from the Broken Hill mine, Aggeneys, Northern Cape Province, South Africa...epimorphs after calcite, 14.2 cm, from the Broken Hill mine, Aggeneys, Northern Cape Province, South Africa...transparent, deep purple cubic crystals on drusy quartz, in some cases with platy white barite crystals |  | | Journal (article/letter/editorial) | | no stolzite equivalent of wulfenite’s Red Cloud mine, yet attractive, somewhat wulfenite-like stolzite...from Chillagoe, Queensland, Australia; the Fat Jack mine, Arizona; and Santa Rosa, Argentina. Stolzite is... These include the well-known Loudville (Mahan) mine at Easthampton, Hampshire County, Massachusetts...Chester County, Pennsylvania, and the Silver Hill mine, Davidson County, North Carolina. It has been found...A fine 1.4-un stolzite on matrix from Ste.Lucie mine, Ste.-Lkgerde Peyre, Lozkre, France;Eric Asselborn |  | Staude, S., Mordhorst, T., Neumann, R., Prebeck, W., Markl, G. (2010) Compositional variation of the tennantite–tetrahedrite solid-solution series in the Schwarzwald ore district (SW Germany): The role of mineralization processes and fluid source. Mineralogical Magazine, 74 (2) 309-339 doi:10.1180/minmag.2010.074.2.309 | Journal (article/letter/editorial) | | solidsolution series in the Schwarzwald ore district (SW Germany): The role of mineralization processes and fluid...Tübingen, Wilhelmstrasse 56, D-72074 Tübingen, Germany [Received 30 October 2009; Accepted 28 April 2010]...locations in the Schwarzwald ore district of SW Germany. Electron microprobe analysis is used to correlate...1980). From the Middle Triassic to Jurassic, SW Germany was part of a shelf platform with distinct time...Lörrach, Karlsruhe and Stuttgart in Southern Germany is well suited to understanding the controls on |  | 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) | | Mineral zoning and gold occurrence in the Fortuna skarn mine, Nambija district, Ecuador Received: 24 February...May 2006 # Springer-Verlag 2006 Abstract The Fortuna oxidized gold skarn deposit is located in the northern...which are named from north to south: Cuerpo 3, Mine 1, Mine 2, and Southern Sector. Massive skarn bodies...affects a quartz–diorite porphyritic intrusion which crops out below the skarn bodies in Mine 2 and the...that skarn formation is directly related to the quartz–diorite porphyritic intrusion, the latter being |  | | Report (chapter) | | from Australia and the Cologne Embayment, West Germany H. Wopfner SUMMARY:Silcretes are subdivided into...been formed by: I crystalline quartz growth; II cryptocrystalline quartz aggregation or III formation...silcretes of the Cologne Embayment in western Germany. SEM investigations of grain surfaces and fabrics...of 97-99% of SiO 2, the main constituent being quartz (see Table 1). TiO z was also enriched, making...mining operations in the large lignite open cut at Fortuna-Garsdorf, situated about 24 km west of Cologne |  | 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 |  | 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...δ18O values of 0.4‰ to 6.2‰ for fluids depositing quartz (below 350°C) in sulfiderich barren veins. Low-temperature...responsible for the precipitation of late comb quartz and calcite in cavities and veins and indicate |  | | 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 |  | | Report (issue) | | Rincon.________________________________________ La Fortuna-------------_----_--_-__-__---_----___.-_-__-___...and section of the north veins of El Palo Verde mine.______-_____.____________-_-_-__---__--_____ Geology...El Promontorio mine________ Geology of the La Fortuna area__-_____-___-__-_---_--_ Geology of the La...rocks are intruded by dikes and irregular bodies of quartz porphyry, diorite, and trachyte. The Triassic rocks...the cross faults are occupied by veins containing quartz, oxides of antimony, and locally gold, chloride |  | | Journal (article/letter/editorial) | | geologicevents apartfromminorbasaltdikes,is a cylindrical quartz monzonitethat is approximately60 m in diin the...morethan99.8 percentaSAr. smallintrusionfrom the Fortuna mine, located in the The aSArspikecalibrations wereperformedagainst... Lithology groundmass containing plagioclase, quartz,K-feld- AnalyticalResultsand CalculatedAges Sample...Feldspar-richfraction Feldspar-quartzfraction Fortuna mine Fortuna mine Fortuna mine 3.74 4.31 3.96 S-6 Porphyriticgranodiorite...plagioclase,K-feldspar,and quartz and an aphanitic groundmass consistingof feldspar,quartz, ore, and chloriteandpyrite |  | | Journal (article/letter/editorial) | | mineralized veins. Oligocene rhyolitic domes and a quartz-monzonite stock also occur in the area, whereas...04 ± 0.05 Ma. Dating of orthoclase from the Fortuna quartz-monzonite was problematic due to excess argon...well after emplacement of the dated phase of the Fortuna stock and, consequently, it cannot be the source...age between epithermal mineralization and the Fortuna stock is indicative of a long-lived but episodic...experiments on orthoclase from the Fortuna quartz-monzonite (Fortuna stock) associated with skarn and manto |  | | 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...Dilles et al. 1997; McInnes et al. 1999). Los Picos-Fortuna and Pajonal-El Abra igneous suites Fig. 1 Map...showing the approximate outline of the Los Picos-Fortuna and Pajonal-El Abra igneous suites, the Chuquicamata...intrusions The Los Picos-Fortuna igneous suite outcrops west of the Chuquicamata mine across the West Fault |  | 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) | | discontinuous skarn orebodies occur from north to south: Fortuna, Cambana, Campanillas, Nambija, Guaysimi, and Sultana...spatially associated with granodiorite and porphyritic quartz–diorite intrusions cutting the Zamora batholith...stage consists essentially of vugs and veins with quartz, K-feldspar, calcite, chlorite, hematite±plagioclase±muscovite...(Fig. 2a, c, d), and up to severalcentimeters-wide quartz-bearing sulfide-poor veins (type I and type II...N San Carlos de las Minas Ecuador PiÒon 0˚ Fortuna DTR64, 184 Cordille ra Quito Amazon craton Cambana |  | | 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...trough west of the Gila Mountains, designated the Fortuna basin, that is estimated to contain about 16,000...nonmarine deposits. 3. A shallow extension of the Fortuna basin, designated the PicachoBard basin, that extends |  | | 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) | | "—letter dated Oct. 24, 1953, from Mr. ViGario. Quartz Sand from Starved Rock, III. From Horsehoe Canyon...111., we have a fine grained gray sand—all smoky quartz. The sand was donated by R. W. Nutting, 35 Forrest...This is a medium grained gray sand. It consists of quartz (colorless, smoky), black biotite, green epidote...is a gray, medium grained sand. It consists of quartz (colorless, smoky), black biotite, pinkish feldspar...fine grained gray sand, and consists entirely of quartz (smoky, colorless, brownish). Donated by Glen E |  | | Journal (article/letter/editorial) | | distributed apatite samples fromeachofthecrustal blocks (Fortuna andChuquieamata Intrusive Complexes) bordering...however, theage-elevation curve forthewestern Fortuna block isshifted vertically withrespect totheeastern...of the major Chuquieamataopen-pit GeologicSetting mine(Fig.1).TheChuquieamata porphyry copperorebody Chuquieamata...istheWestfault.CIC = Chuquicamata Intrusive Complex, FIC = Fortuna Intrusive Complex. SCIENTIFIC COMMUNICATIONS...Blanco, 500 rn [•-• Fortuna Granodiorite ChuquicatnataIntrusiveComplex • • Quartz-sericite alteration |  | | Journal (article/letter/editorial) | | biiefringence is approximately 0.01. The mineral occurs in quartz veins associated with stibiconite. X-ray investigation...White came from La Fortuna and San Jose mines, the type material being that from La Fortuna. In August 1950...intimately admixed stibiconite. A specimen from La Fortuna mine, only slightly contaminated with stibiconite...removed in any way. The only other contaminant was quartz, which was largely eliminated by careful picking...dissolve completely (with the exception of the quartz) in concentrated HCt containing KI as a reducing |  | 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) | | 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...Potrerillos, Olson 1989; Marsh et al. 1997; La Fortuna-El Negro, Perelló et al. 1996; Quebrada Blanca-Collahuasi...deposit Mina Sur, the newly developed Ministro Hales mine (formerly known as Mansa Mina) located 5.5 km south...although in the Carmen area, east of the Chuquicamata mine, this unit yielded U–Pb zircon ages of 233.1±2.2 |  | | Report (issue) | | the anticlinal axis and dip toward it; but the Fortuna fracture, which carried the richest ore body, lies...Reference Ore district Sabinal, Chihuahua La Fortuna, Chihuahua Las Cruces, Sonora Oposura, Sonora Guaynopita...DIPPING ON SECTION) METALLOGENETIC ZONE ~~xy_ — MINE OR PROSPECT FLOW Many ROCKS SECTION) peeeorcor...carries abundant, but narrow and discontinuous, quartz-carbonate veins of the base-metal type containing...only drusy quartz and pyrite Chalcopyrite-pyrite-gold-quartz veins _ : : Chalcopyrite-quartz-carbonate |  | | Book (volume) | | Iron Ores 1. Segregations of Magnetic Iron Ore in Quartz-free Orthoclase Porphyries and Syenites . . "'...Schluckenau, in Northeastern Bohemia, and at Sohland, in Saxony (e) Arsenious Nickel Ores in the Serpentine of...Spherosiderites Carbonaceous Iron Ores of Upper Silesia and Saxony Carbonaceous Iron Ores of Great Britain The Iron...(Tourmaline-bearing Copper Formations.) 6. Cupriferous Quartz Veins Australian Deposits African Veins (6) ....Copper Veins (Gangue of Various Carbonates with Quartz, ; ,226 Barite, and sometimes Fluorspar) Zeolitic |  | 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...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...older?. Li, Be, Nb, Ta, Sn, W; feldspar muscovite, quartz Cu, W, Fe U Au, Ag, Pb, Zn Cu, Au Ordovician to |  | 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 |  | 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) | | 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...DFS Fig. 1. Surface geology map of the El Abra mine, with sample locations. Projection: UTM19; Datum:...fault system. Modified from an unpublished El Abra mine map. EA-710 EA-657 EA-6 EA-1284 22° S Pacific...biotite and sericite associated with potassic and quartz-sericite alterations, respectively. These data |  | | Journal (article/letter/editorial) | | composed is of Chuqui the Granite III. from Fortuna the propylitic Sciences, in and Chuqui rock... Monzonite, atoms. The the rocks oxygen Fortuna Si Fe20,/Fe0 indicate Qz-Mt-Fa (1975) gave... their the presence subsolidus entire of Fortuna imply Monzonite, that congelation. meteoric... Monzonite (ChGP) west Plutonic Aracena, Fortuna were not little amount of cause of the ...mineralization and covers the area between the Fortuna Monzo The The wall rocks of the com plex are |
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