 | | Journal (article/letter/editorial) | | Composition of Altered Rocks at the Golden Cross Epithermal Au-Ag Deposit, New Zealand JEFFREY L. MAUK† AND MARK...Auckland Mail Centre, Auckland 1142, New Zealand Abstract Golden Cross is a late Miocene volcanic-hosted...assemblages located in the Coromandel peninsula, New Zealand. Gold- and Ag-bearing quartz veins occur in intensely...primary control of whole-rock geochemistry at Golden Cross, as at other volcanic-hosted epithermal deposits...geochemical zonation patterns identified at Golden Cross are very similar to those at other epithermal |  | | Report (issue) | | NEW ZEALAND DEPARTMENT OF SCIENTIFIC AND INDUSTRIAL RESEARCH NEW ZEALAND GEOLOGICAL SURVEY 125th ANNIVERSARY...1865 -1990 NEW ZEALAND GEOLOGICAL SURVEY BULLETIN 104 ISSN 0077-9628 Minerals of New Zealand by G. L....initials should be G.T., not G.L. Lower Hutt, New Zealand 1990 I I Beach sand, alluvium, • terrace...Figure 1. Simplified geological sketch-map of New Zealand. 0 20 40 60 80 100 KM l INTRODUCTION It...Morgan's "Minerals and Mineral Substances of New Zealand" was published, as NZ. Geological Survey bulletin |  | | Journal (article/letter/editorial) | | OF VOLCANIC ROCKS: I. THE GOLDEN CROSS EPITHERMAL ORE DEPOSIT, NEW ZEALAND DAVID A. TILLICK,l DONALD...University of Auckland, Private Bag 92019, Auckland, New Zealand 2Department of Geological Sciences, The University...interstratified clay minerals in the Golden Cross epithermal deposit, New Zealand, hydrothermally altered volcanic...sequence smectite through illite-smectite (I-S) to muscovite were examined by optical microscopy, X-ray diffraction...intermediate in composition between common illite and muscovite, and illite-rich I-S. Selectedarea electron diffraction |  | | Journal (article/letter/editorial) | | mines, and application to the Martha Au–Ag mine, Waihi, New Zealand Devin N. Castendyk a a,* , Jeffrey L...Auckland, New Zealand b Geology Department, The University of Auckland, Private Bag 92019, Auckland, New Zealand...method to the Martha epithermal Au–Ag mine, Waihi, New Zealand. Heterogeneous ore deposits, like Martha...nuisances depending on lake water chemistry. Many recent mine management strategies favor 0883-2927/$ - see front...into public amenities that will exist long after mine closure, as recreational areas, theme parks, scientific |  | Peacor, Donald R., Bauluz, Blanca, Dong, Hailiang, Tillick, David, Yan, Yonghong (2002) TRANSMISSION AND ANALYTICAL ELECTRON MICROSCOPY EVIDENCE FOR HIGH Mg CONTENTS OF 1M ILLITE: ABSENCE OF 1 M POLYTYPISM IN NORMAL PROGRADE DIAGENETIC SEQUENCES OF PELITIC ROCKS. Clays and Clay Minerals, 50 (6) 757-765 doi:10.1346/000986002762090281 | Journal (article/letter/editorial) | | the Golden Cross gold deposit, New Zealand, the Broadlands-Ohaaki geothermal system, New Zealand, the...the Potsdam Sandstone, New York, and the Silverton Caldera, Colorado. Specific clay-mineral packets identified...2M1 which parallels the sequence from illite to muscovite (e.g. Grathoff and Moore, 1996 and references...normal prograde geologic sequences. Indeed, using cross-fringes produced by non-00l reflections, they noted...Broadlands-Ohaaki geothermal system of the North Island of New Zealand. Identification was by TEM, including SAED patterns |  | | Journal (article/letter/editorial) | | THE BROADLANDS-OHAAKI HYDROTHERMAL SYSTEM, NEW ZEALAND YONGHONG Y AN, 1 DAVID A. TILLlCK,2 DONALD...Auckland, New Zealand 3Geothermal Institute, University of Auckland, Private Bag, 92019, Auckland, New Zealand...from the Broadlands-Ohaaki hydrothermal system, New Zealand, were investigated using X-ray diffraction (XRD)...we ll known, are equivalent to those in the Golden Cross hydrothermal gold deposit as described in Part...Broadlands-Ohaaki geothermal system, North Island, New Zealand, is a currently active geothermal system. The |  | | Journal (article/letter/editorial) | | University of Auckland, Private Bag, 92019, Auckland, New Zealand Abstract The Broadlands-Ohaaki geothermal system...mineral zonation, which is the focus of this paper. New data are presented on the occurrence and abundance...1 of about 20 known hydrothermal systems in the region (Fig. 1). These systems are liquid dominated and...Island, New Zealand. Widespread volcanism and hydrothermal activity have characterized the region for the...field showing well locations used to construct cross sections (Figs. 2 and 5). The Broadlands and Ohaaki |  | Kesler, S. E., Hall, C. M., Russell, N., Pinero, E., Sanchez, R. C., Perez, M. R., Moreira, J. (2004) Age of the Camaguey Gold-Silver District, Cuba: Tectonic Evolution and Preservation of Epithermal Mineralization in Volcanic Arcs. Economic Geology, 99 (5) 869-886 doi:10.2113/gsecongeo.99.5.869 | Journal (article/letter/editorial) | | pp. 869–886 Age of the Camagüey Gold-Silver District, Cuba: Tectonic Evolution and Preservation of...where batholiths are widely exposed. The Camagüey district in central Cuba violates this tenet and provides...create and expose epithermal deposits. The Camagüey district hosts the Jacinto and Florencia low-sulfidation...low-sulfidation vein deposits and the Deseada and Golden Hill high-sulfidation prospects, all of which are within...Camagüey batholith and stand above the paleosurface. New Ar-Ar age measurements indicate that Jacinto-type |  | Zhai, Wei, Sun, Xiaoming, Sun, Weidong, Su, Liwei, He, Xiaoping, Wu, Youliang (2009) Geology, geochemistry, and genesis of Axi: A Paleozoic low-sulfidation type epithermal gold deposit in Xinjiang, China. Ore Geology Reviews, 36 (4) 265-281 doi:10.1016/j.oregeorev.2009.04.003 | Journal (article/letter/editorial) | | Technology of China, Heifei, 230026, PR China e Axi Gold Mine, Yining, Xinjiang, 835000, PR China b c a r t i...Kelian in Indonesia, Golden Cross in New Zealand, Ladolam and Porgera in Papua New Guinea, Chinkuashih...western Tianshan orogenic belt in Xinjiang Autonomous Region, China. The wall rocks of the deposit are subaerial...and identifying guidelines for exploration in the region. 2. Geological setting The Axi gold deposit is...located in Yining County of Xinjiang Autonomous Region, northwestern China, approximately 50 km NW of |  | Boomeri, Mohammad, Moradi, Rahele, Stein, Holly, Bagheri, Sasan (2019) Geology, Re-Os age, S and O isotopic composition of the Lar porphyry Cu-Mo deposit, southeast Iran. Ore Geology Reviews, 104. 477-494 doi:10.1016/j.oregeorev.2018.11.018 | Journal (article/letter/editorial) | | its various 34 igneous rocks have become a key region for both petrological and tectonic studies (e.g...youngest fault system strikes NE-SW and clearly 116 cross-cuts all mineralization and the LIC (Fig. 4). 117...contains K- 180 feldspar, plagioclase, biotite, muscovite, aegirine, microcline perthite, and calcite. The...veinlets. 288 Based on petrographic examination and cross-cutting relationships, at least five main groups...421 δ18O values (Field and Fifarek, 1985). This new hydrothermal water could sharply increase the 18O |  | | Journal (article/letter/editorial) | | epithermal gold mineralization in the Rosario–Bunawan district, East Mindanao Ridge, Philippines Jochen Kolb...Springer-Verlag 2009 Abstract The Rosario–Bunawan district is situated about 200 km north of Davao City,...Southern Philippines. Gold is produced from the Co-O mine, containing about 2,034,000 t of ore at 10.9 g/t...mineralization in the Rosario–Bunawan district and the Co-O mine is confined to narrow (0.2–4 m) low-sulfidation...near horizontal N–S-oriented vein opening (D2). New D2 extensional shear or shear veins formed in the |  | | Journal (article/letter/editorial) | | Permo-Carboniferous granitoid intrusions of the New England Orogen. Mineralisation occurred at a range...White P. M. Ashley (&) Earth Sciences, University of New England, 2351 Armidale, NSW, Australia E-mail: pashley@metz...Department, University of Otago, PO Box 56, Dunedin, New Zealand structural levels in the one deposit, formed...a whole, and relate these features to the local mine scale. These observations are then linked to the...Southern portion of the New England Orogen with location of the Hillgrove district, major regional structures |  | | Book | | appointments at the Astrobiology Centre, University of New South Wales, Sydney, and the China University of...in Europe, southern Africa, South East Asia, New Zealand, the southwest Pacific, China, Greenland and... Contents 4.6.5 Candelaria, Punta Del Cobre District, Chilean Coastal Belt. . . . . . . . . . . . ...2 Ladolam Epithermal System, Lihir Island, Papua New Guinea . . . . . . . . . . . . . . . . . . . . ..... . . . . . . . . 5.3.3 Hauraki Goldfield, Coromandel Peninsula, New Zealand 5.3.4 The Epithermal Systems |  | | Journal (article/letter/editorial) | | profile across a multistage, m-wide vein of the Clara mine, Central Schwarzwald. These results highlight the...at different times. In particular for the Clara mine veins such repeated reactivation from Permian to...K–Ar, Rb–Sr and (U,Th)/ He methods, in the Clara mine and for a number of faults in the area (Lippolt...chlorite, hematite, pyrite, K-feldspar, sericite (muscovite), and clay minerals (possibly kaolinite). This...includes hematite, pyrite, chlorite, K-feldspar, muscovite, and clay minerals, as characteristic for epithermal |  | Abidin, Hamdan Z., Harahap, Bhakti H. (2007) Indikasi Mineralisasi Epitermal Emas Bersulfi Da Rendah, Di Wilayah Kecamatan Bonjol, Kabupaten Pasaman, Sumatera Barat [Indications of Low Da-Sulfated Gold Epithermal Mineralization, in the Bonjol District, Pasaman Regency, West Sumatra]. Indonesian Journal of Geology, 2 (1) 55-67 doi:10.17014/ijog.2.1.55-67 | Journal (article/letter/editorial) | | ABSTRACT Bonjol gold prospect, known as Old Dutch Gold mine, consists of several ore bodies (Malintang, Balimbing...nontronite, calcite, halloysite, palygorskite, muscovite, sepiolite, analcime, heulandite, clino-chlor...Hishikari, Jepang (Izawa dkk., 1990), Golden Cross, New Zealand (Lawless dkk., 1988) dan Creede, Colorado...yang dijumpai dalam batuan Gunung Api Taupo (New Zealand) (Henley and Hoffman, 1987) dan lingkungan pemekaran...sangat mirip seperti yang terjadi di Taupo (New Zealand) (Lawless dkk., 1995) dan Hishikari (Jepang) |  | | Report (chapter) | | to use when assessing economic favorability of a region or prospect. This chapter summarizes the various...fission track dating) and is therefore useful for cross-calibration purposes and complementary low-T history...potentially reveal the full thermal history of the region. Finally, modeling of thermochronometry data adds...of thermal history of an ore deposit or mineral district can be elucidated. It should be noted that one...theoretical intrusion are also shown. The white region brackets the thermal regime of hypogene ore formation |  | | Journal (article/letter/editorial) | | comprised locally transported sediment (Southern Cross Formation), derived from the same andesitic precursor...Ward’s kaolinite (Macon, Georgia, USA) and Ward’s muscovite were used as reference materials. X-ray diffraction...carbon-coated Cu grid and allowed to dry. Figure 1. Cross section showing the locations of the samples subjected...determined from both muscovite and kaolinite spectra, and those for K/Si and Fe/Si from muscovite spectra, using...natroalunite, and gypsum, whereas the Southern Cross Formation is dominated by quartz, kaolinite, and |  | | Book | | proportion of the accumulating information. This new book represents an attempt to address this major...of gold mineralization. For access to a wealth of new information the reader is encouraged to tum to the...demand for gold in the 1980s has opened up exciting new avenues of research and generated a wealth of hard...James Crocket is a graduate of the University of New Brunswick, Oxford University, and the Massachusetts...Manchester in 1973 (Ph.D.) and was then employed as a mine and exploration geologist by Falcon Mines Ltd in |  | | Journal (article/letter/editorial) | | Alteration and Mineralization in the Comstock District, Nevada DONALD M. HUDSON† 1540 Van Petten Street...metal deposits of the world-renowned Comstock district of western Nevada constitute one of several superimposed...superimposed Miocene hydrothermal systems. In the district, Mesozoic metasedimentary and igneous rocks are...kaolinite alteration exposed at the periphery of the district may be linked to preore alteration near the paleowater...Quartz, chlorite, illite, and very localized muscovite alteration (deep low-sulfidation) developed coeval |  | | Journal (article/letter/editorial) | | Ghana, Oberthür et al., 1997; Eniseiski mining district, Russian, Genkin et al., 1998; Suzdal gold deposit...of calcite (20-40 vol.%), chlorite (10-25 %), muscovite (10-20 %), quartz (10-20 %), and various amounts...vol.%), albite (10-20 %), calcite (10-20 %), muscovite (5-15 %), chlorite (< 5 %), sulfides (10-20 %)...arsenopyrite (Fig. 3e). Quartz coexists with muscovite and calcite in quartz-albite-sulfide veins (Fig...calcite with minor pyrite, muscovite, chlorite, quartz, and native gold. Muscovite and calcite generally coexist |  | Bongiolo, Everton Marques, Patrier-Mas, Patricia, Mexias, André Sampaio, Beaufort, Daniel, Formoso, Milton Luiz Laquintinie (2008) Spatial and temporal evolution of hydrothermal alteration at Lavras do Sul, Brazil: evidence from dioctahedral clay minerals. Clays and Clay Minerals, 56 (2) 222-243 doi:10.1346/ccmn.2008.0560207 | Journal (article/letter/editorial) | | alteration features observed in the east of the mining district. Deeper levels of exposure of a large hydrothermal...system are observed in the west of the mining district, as shown by higher-rank dioctahedral minerals... the Lavras do Sul Au-Cu (>Pb, Zn, Ag) mining district comprises a group of prospects hosted in Neoproterozoic...investigations of gold prospects were conducted in this district by Brazilian public agencies in the 1940s and...(Figure 1b, locations 8, 19, and 2, respectively). New exploration programs by mining companies are now |  | | Journal (article/letter/editorial) | | dissolution of detrital reactants and crystallization of new minerals accompanied by loss of porosity and permeability...phyllosilicate zones for the IID 2 well: (1) illite-muscovite (115 220ºC), (2) chlorite (220 310ºC), (3) biotite...(2000), who determined that detrital kaolinite and muscovite reacted to form interstratified illite-smectite...dissolution. In the 1222 m deep sample, chlorite and muscovite crystals occur both as detrital grains and as...combination of pore space and phyllosilicates (muscovite and chlorite) as shown below in TEM images. This |  | | Journal (article/letter/editorial) | | and the other is the No. 2 Imperial Irrigation District (IID No. 2) well, with samples from depths of...grain-size distributions were then determined for new reduced coordinates with frequency divided by maximum...from 485.5 m, from the No. 2 Imperial Irrigation District (IID No. 2) well, are plotted in Figure 4a c....to ~255.8 mbs: detrital materials, including muscovite, biotite and kaolinite, are undergoing modification...packets have the appearance of subparallel laths in cross-section, and only partially fill pore-space. All |  | Wilkinson, W., Wendt, C., Wilkins, J., Haxel, G. (1986, March) Frontiers in geology and ore deposits of Arizona and the southwest, Field Trip Guidebook 3 - Precious metal mineralization, stratigraphy, and tectonics in southeastern California - Part A. Guidebook. Arizona Geological Society | Report (issue) | | trips to recent precious-metal discoveries, areas of new and developing stratigraphic and structure concepts...to vehicles. Lunch* Stop 2. Overview of Mesquite mine Stop 3. Cargo Muchacho Mountains-visits to American...Exposure of cataclastic ledge Stops 5 and 6. Picacho mine. Lunch* between stops Depart for Tucson Arrive in...possible, bring hard hat and safety glasses for mine FIELD TRIP 3 PRECIOUS-METAL MINERALIZATION, STRATIGRAPHY...structural control of Au mineralization in the Picacho mine. Recent successes by exploration geologists from |  | John, D. A., Hofstra, A. H., Fleck, R. J., Brummer, J. E., Saderholm, E. C. (2003) Geologic Setting and Genesis of the Mule Canyon Low-Sulfidation Epithermal Gold-Silver Deposit, North-Central Nevada. Economic Geology, 98 (2) 425-463 doi:10.2113/gsecongeo.98.2.425 | Journal (article/letter/editorial) | | Phelps Dodge Tyrone, Inc., P.O. Box 571, Tyrone, New Mexico 88065 AND ERIC C. SADERHOLM * Newmont Gold...Company, Yanacocha, Peru Abstract The Mule Canyon mine exploited shallow, low-sulfidation, epithermal Au-Ag...rift (White and Hedenquist, 1990). THE MULE CANYON mine exploited low-sulfidation epithermal Au-Ag deposits...(Quaternary) Olivine basalt (Miocene) Mule Canyon Mine 2 Trachydacite (Miocene) 4 3 5 8 Muleshoe fault...(Oligocene) Sedimentary rocks (Paleozoic) Contact Barite mine Fault, dotted where concealed. Ball on downthrown |
|
