Gold In Porphyry Copper Systems

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Gold In Porphyry Copper Systems

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Author : Edwin W. Tooker
language : en
Publisher:
Release Date : 1990

Gold In Porphyry Copper Systems written by Edwin W. Tooker and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Copper ores categories.

Gold In Porphyry Copper Systems

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Author : E. W. Tooker
language : en
Publisher:
Release Date : 1990

Gold In Porphyry Copper Systems written by E. W. Tooker and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.

Geology And Resources Of Gold In The United States

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Author : Geological Survey (É.-U.)
language : en
Publisher:
Release Date : 1990

Geology And Resources Of Gold In The United States written by Geological Survey (É.-U.) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.

Gold In Porphyry Copper Systems

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Author : Daniel R. Shawe
language : en
Publisher:
Release Date : 1990

Gold In Porphyry Copper Systems written by Daniel R. Shawe and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.

Southwest Pacific Rim Gold Copper Systems

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Author : Greg John Corbett
language : en
Publisher:
Release Date : 1998

Southwest Pacific Rim Gold Copper Systems written by Greg John Corbett and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Copper ores categories.

Geophysical Signatures Of Copper Gold Porphyry And Epithermal Gold Deposits And Implications For Exploration

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Author : Terence Graham Hoschke
language : en
Publisher:
Release Date : 2010

Geophysical Signatures Of Copper Gold Porphyry And Epithermal Gold Deposits And Implications For Exploration written by Terence Graham Hoschke and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Copper ores categories.

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.

The Porphyry Copper System And The Precious Metal Gold Potential

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Author : Ian Richard Gendall
language : en
Publisher:
Release Date : 1994

The Porphyry Copper System And The Precious Metal Gold Potential written by Ian Richard Gendall and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Copper ores categories.

Hypogene Alteration And Mineralization In The Dos Pobres Porphyry Cu Au Mo Deposit Safford District Arizona

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Author : Daniel Russin
language : en
Publisher:
Release Date : 2008

Hypogene Alteration And Mineralization In The Dos Pobres Porphyry Cu Au Mo Deposit Safford District Arizona written by Daniel Russin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Copper ores categories.

Dos Pobres is unusual among Arizona porphyry deposits in that it is relatively gold- and bornite-rich, and magnetite-bearing and is intimately associated with relatively mafic (quartz monzodiorite-low silica granodiorite) porphyry dikes. Conversely, it has considerably less pyrite and acid alteration than most other Arizona porphyry deposits. These features are like those in many other Au-rich porphyry systems, and they have also stimulated comparisons with andesite-hosted iron-oxide (-Cu-Au) (IOCG) systems such as Candelaria.

Gold

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Author : Geological Survey (U.S.)
language : en
Publisher:
Release Date : 1989

Gold written by Geological Survey (U.S.) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with categories.

Distribution Of Gold In Porphyry Copper Deposits

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Author : Dennis P. Cox
language : en
Publisher:
Release Date : 1988

Distribution Of Gold In Porphyry Copper Deposits written by Dennis P. Cox and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Copper ores categories.