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Author : Edwin W. Tooker,Laurence P. James,Ted G. Theodore,Stephen S. Howe,David W. Blake
Publisher : Unknown
Page : 68 pages
File Size : 42,5 Mb
Release : 1990
Category : Copper ores
ISBN : UCR:31210025972645
Author : Geological Survey (É.-U.)
Publisher : Unknown
Page : 0 pages
File Size : 43,9 Mb
Release : 1990
Category : Electronic
ISBN : LCCN:89600379
Author : Terence Graham Hoschke
Publisher : Unknown
Page : 47 pages
File Size : 51,6 Mb
Release : 2010
Category : Copper ores
ISBN : 1862956251
Geophysical data are presented for a number of deposits including the Batu Jijau, Elang, Grasberg, and Alumbrera porphyry copper-gold deposits; the Martabe and Yanacocha high-sulphidation epithermal gold deposits; and the Pajingo and Waihi low-sulphidation epithermal gold deposits. The physical properties of the mineralisation and alteration are discussed with emphasis on those properties that can be measured with standard exploration techniques. Mineralisation in porphyry Cu-Au deposits is commonly associated with magnetite that can produce strong discrete magnetic anomalies. This is usually within a zone of magnetite-destructive alteration that can be identified with a high-resolution magnetic survey. Magnetic surveys are also useful in defining regional structure and geology in the porphyry environment. Strong chargeabilities due to sulphides are typically associated with porphyry systems. Mineralisation and clay-pyrite alteration can produce strong anomalies, and late-stage and post-mineral intrusions can be mapped as chargeability lows within the system. These systems may be more conductive than the host rocks because of clay-pyrite alteration and sulphide veining, and airborne EM can be useful in locating and defining their extent. Gravity, radiometrics, remote sensing and topography may also be useful in exploration for porphyry Cu-Au deposits. In high-sulphidation epithermal systems gold is commonly associated with massive silica alteration. This alteration results in resistivities in the order of thousands of ohm-metres compared with background resistivities of tens of ohm-metres in argillic and propylitic alteration. Both ground resistivity and airborne EM surveys have been successful in locating and defining these deposits. Alteration in high-sulphidation epithermal deposits is magnetite destructive over a large area, although it does not appear to have a large vertical extent as the subdued character of the underlying lithologies can be observed. Typically, gold in low-sulphidation epithermal deposits is in thin quartz veins that are associated with major structures. The alteration associated with the veins is magnetite destructive, and high-resolution magnetics can be very useful and cost-effective technique to map the structures and alteration. Some deposits are associated with broad zones of magnetite destruction which is apparent in the regional magnetics. The mineralised quartz veins are within broader zones of silicification, and resistivity surveying can be used to map these zones. Generally, the high resistivity zones due to silicification are coincident with the structures identified in the magnetics. High-resolution magnetics and electrical surveys are the most useful geophysical techniques in exploration for porphyry and epithermal deposits. Airborne magnetic and EM surveys are fast and cost effective, particularly in areas of rugged topography. Regional magnetics, gravity, remote-sensed data and topographic data can also be used to identify major structures, intrusive complexes and alteration. Radiometric surveys can be useful in mapping geology and alteration.
Author : Greg John Corbett
Publisher : Unknown
Page : 262 pages
File Size : 45,6 Mb
Release : 1998
Category : Copper ores
ISBN : STANFORD:36105028972243
Author : Kula Misra
Publisher : Springer Science & Business Media
Page : 866 pages
File Size : 49,7 Mb
Release : 2000
Category : Nature
ISBN : 0045530092
Mineral deposits have supplied useful or valuable material for human consumption long before they became objects of scientific curiosity or commercial exploitation. In fact, the earliest human interest in rocks was probably because of the easily accessible, useful (e. g. , red pigment in the form of earthy hematite) or valuable (e. g. , native gold and gemstones) materials they contained at places. In modem times, the study of mineral deposits has evolved into an applied science employing detailed field observations, sophisticated laboratory techniques for additional information, and computer modeling to build complex hypotheses. Understanding concepts that would someday help geologists to find new mineral deposits or exploit the known ones more efficiently have always been, and will continue to be, at the core of any course on mineral deposits, but it is a fascinating subject in its own right, even for students who do not intend to be professional economic geologists. I believe that a course on mineral deposits should be designed as a "capstone course" that illustrates a comprehensive application of concepts from many other disciplines in geology (mineralogy, stratigraphy and sedimentation, structure and tectonics, petrology, geochemistry, paleontology, geomorphology, etc. ). This book is intended as a text for such an introductory course in economic geology, primarily for senior undergraduate and graduate students in colleges and universities. It should also serve as a useful information resource for professional economic geologists.
Author : R. P. Foster
Publisher : Springer Science & Business Media
Page : 447 pages
File Size : 51,7 Mb
Release : 2012-12-06
Category : Science
ISBN : 9781461304975
Within the last decade, the high and continuing demand for gold has prompted a global gold rush on a scale never before seen, not even in the heady days of Ballarat, California and the Yukon. Gold is being sought on every continent and, with very few exceptions, in every country around the world. Such interest and fierce competition has demanded considerable innovation and improvement in exploration techniques paralleled by a rapid expansion of the geological database and consequent genetic modelling for the many different types of gold deposits now recognized. This proliferation of data has swamped the literature and left explorationist and academic alike unable to sift more than a small proportion of the accumulating information. This new book represents an attempt to address this major problem by providing succinct syntheses ofall major aspects ofgold metallogeny and exploration, ranging from the chemical distribution of gold in the Earth's crust, and the hydrothermal chemistry of gold, to Archaean and Phanerozoic lode deposits, epithermal environments, chemical sediments, and placer deposits, and culminates in chapters devoted to geochemical and geophysical exploration, and the economics of gold deposits. Each chapter is written by geoscientists who are acknowledged internationally in their respective fields, thus guaranteeing a broad yet up-to-date coverage. In addition, each chapter is accompanied by reference lists which provide readers with access to the most pertinent and useful publications.
Author : Anonim
Publisher : Unknown
Page : 680 pages
File Size : 51,9 Mb
Release : 1983
Category : Geology
ISBN : MINN:31951P00065733B
Author : Anonim
Publisher : Unknown
Page : 700 pages
File Size : 51,8 Mb
Release : 1984
Category : Mines and mineral resources
ISBN : STANFORD:36105018668462
Author : Geological Survey (U.S.)
Publisher : Unknown
Page : 428 pages
File Size : 48,9 Mb
Release : 1989
Category : Geochemistry
ISBN : OSU:32435022084354
Author : A. Piestrzynski
Publisher : CRC Press
Page : 1180 pages
File Size : 51,5 Mb
Release : 2022-05-02
Category : Science
ISBN : 9781000099584
The Joint 6th Biennial SGA-SEG Meeting was held in Krakow in August 2001. This volume contains 274 extended abstracts, grouped thematically under 18 session titles covering topics such as lead-zinc deposits; metamorphism affecting mineral deposits; and the environmental aspects of mining.
Author : Anonim
Publisher : Unknown
Page : 642 pages
File Size : 55,8 Mb
Release : 1984
Category : Geology
ISBN : MINN:31951T00214071C
Author : Anonim
Publisher : Unknown
Page : 324 pages
File Size : 44,6 Mb
Release : 1992
Category : Geochemistry
ISBN : ERDC:35925002524384
Additional title page description: The Buckingham stockwork molybdenum deposit, a Late Cretaceous calc-alkaline system, is estimated to contain more than 1,000 million tons of mineralized rock averaging 0.10 weight percent Mo (MoS2) and containing small amounts of silver, tungsten, copper, and gold.
Author : Peter Laznicka
Publisher : Springer Science & Business Media
Page : 949 pages
File Size : 44,5 Mb
Release : 2010-09-02
Category : Science
ISBN : 9783642124051
Metals in the earth's crust are very unevenly distributed and, traditionally, a small number of ore deposits, districts or countries have dominated the world supply and have influenced commodity prices. The importance of exceptionally large, or rich, deposits has greatly increased in the age of globalization when a small number of international corporations dominate the metals market, based on few very large ore deposits, practically anywhere in the world. Search for giant orebodies thus drives the exploration industry: not only the in-house teams of large internationals, but also hundreds of junior companies hoping to sell their significant discoveries to the "big boys". Geological characteristics of giant metallic deposits and their setting and the politico-economic constraints of access to and exploitation in prospective areas have been a "hot topic" in the past fifteen years, but the knowledge generated and published has been one-sided, scattered and fragmented. This is the first comprehensive book on the subject that provides body of solid facts rather than rapidly changing theories, written by author of the Empirical Metallogeny book series and founder of the Data Metallogenica visual knowledge system on mineral deposits of the world, who has had an almost 40 years long international academic and industrial experience. The book will provide abundant material for comparative research in metallogeny, practical information for the explorationists as to where to look for the "elephants", and some inspiration for commodity investors.
Author : Roger Taylor
Publisher : Springer Science & Business Media
Page : 146 pages
File Size : 40,8 Mb
Release : 2011-09-22
Category : Science
ISBN : 9783642220517
This text concentrates upon field observations concerning leached cappings and gossans, occurring as oxidised surface expressions of underlying ore zones. Although the advent of modern multielement geochemical sampling and easier mechanical excavation assist considerably in subsurface interpretation, there are still many occasions where the first observation and recognition are made by the lone field geologist. New exposures continue to be found in remote and often difficult terrains, where “on the spot” skills are of prime importance. In general terms the text has been arranged from the broad scale to the specific, and it should be realised that all scales provide valuable input for final interpretation. The topics covered include: • Theoretical perspectives • Initial recognition • General field observations • Detailed field observations (secondary minerals, boxworks) • Porphyry copper leached cappings
Author : Edwin W. Tooker,William C. Bagby,Thor H. Kiilsgaard,Frederick S. Fisher,Earl H. Bennet,Jack Allison Redden,Gregory McN. French
Publisher : Unknown
Page : 84 pages
File Size : 53,6 Mb
Release : 1989
Category : Gold mines and mining
ISBN : UCR:31210025972595