Geology of the World's Major Gold Deposits and Provinces
Author :
Publisher :
Page : 845 pages
File Size : 22,4 MB
Release : 2020
Category : Geology, Economic
ISBN : 9781629493121
Author :
Publisher :
Page : 845 pages
File Size : 22,4 MB
Release : 2020
Category : Geology, Economic
ISBN : 9781629493121
Author : Steffen Gerd Hagemann
Publisher :
Page : 584 pages
File Size : 33,60 MB
Release : 2000
Category : Gold
ISBN :
Author : Paul Kibler Sims
Publisher :
Page : 28 pages
File Size : 37,69 MB
Release : 1992
Category : Geology, Stratigraphic
ISBN :
The Canadian segment of the Archean Superior province is a major world source of lode gold. The gold deposits occur in or near regional transcurrent and oblique slip-shear deformation zones that comprise a conjugate set to a northwest- directed compression of the Superior province. These structures provided permeable pathways for the flow of large volumes of auriferous fluid derived from an external source. Historic gold production from the United States segment of the Superior province is modest, but the close similarity in the geologic environment of the United States and Canadian segments suggests that large gold deposits should be present in the U.S.A. An occurrence model largely based on known parameters of gold mineralization in Canada suggests that the greenstone-granite terranes of the Wawa and Wabigoon sub-provinces in the United States are favorable for important gold deposits. The model suggests that gold mineralization took place during or later than the transcurrent faulting and that it took place contemporaneously with emplacement of silica-undersaturated intrusions. The faulting occurred late in the igneous-tectonic history of the Superior province, about 2,690 Ma. Extensive, intense alteration comprising carbonitization, silicification, and sulfidization accompanied the gold mineralization. The relationships between alteration minerals and mineralized veins suggest a close temporal relationship between the alteration and gold mineralization processes. The proposed occurrence model for gold mineralization and the available data suggest that two broad regions of greenstone in the Archean Superior province in north-central United States are particularly favorable for gold deposits: (1) the Upper Peninsula of Michigan, and (2) northeastern Minnesota. The Ishpeming greenstone belt of the Wawa subprovince in Michigan contains the important Ropes deposit and several other known gold occurrences, and the Vermilion district (Wawa subprovince) in northeastern Minnesota contains highly anomalous gold in soils and minor known bedrock occurrences. Transcurrent faults in both areas should be favorable sites for gold mineralization
Author : Ted G. Theodore
Publisher :
Page : 308 pages
File Size : 22,73 MB
Release : 1987
Category : Geology
ISBN :
Author : Marco Keersemaker
Publisher : Springer Nature
Page : 97 pages
File Size : 24,43 MB
Release : 2020-01-28
Category : Science
ISBN : 3030402681
This book summarizes the exploration history and provides a framework for assessing the economic potential of the country’s minerals by defining minimal deposit parameters for the various commodities present. Suriname was explored extensively for mineral occurrences in the course of the previous century, indicating the presence of a range of commodities. The country mined and processed bauxite for a century (until 2016), and has an even longer history of small-scale alluvial gold mining; it is currently home to two major gold producers. However, exploration activities have been limited during the past 4 decades as most parts of Suriname’s interior are difficult to access, making geological fieldwork both difficult and expensive. Further, the markets and prices have changed in the interim, which calls for a fresh look at the historic data.
Author : Neil Phillips
Publisher : Springer Nature
Page : 294 pages
File Size : 37,56 MB
Release : 2022-06-16
Category : Science
ISBN : 981163081X
This book addresses the origin of gold deposits to answer questions of science and curiosity. These answers contribute in turn to the improved exploration and mining of gold. Initially there is a summary of the methods used to address the genesis of gold deposits including some of the essential science and concepts. Five basic observations follow that apply to many gold deposits and need to be considered in any genetic ideas. Magmatic processes enriching gold are discussed followed by the role of aqueous fluids during gold deposit formation at elevated temperatures and pressures. Modifying effects after deposit formation include high-grade metamorphism, retrogression, weathering, and erosion. The main types of gold deposits are then explained within the spectrum of viable genetic ideas, with informal names for these examples that include gold-only, gold-plus, Carlin, slate-belt, epithermal, porphyry, iron oxide copper gold, and Archean greenstone. Case histories are included in which the role of gold geology contributed directly to discoveries—one example is at the province-scale and another at the goldfield-scale. Unlike other books on the subject, this one addresses virtually all gold deposit types rather than focusing on one type in isolation. The primary readership includes industry geologists, senior undergraduates, postgraduates, and those with some knowledge of science and an interest in the gold industry.
Author : Maureen G. Johnson
Publisher :
Page : 54 pages
File Size : 22,80 MB
Release : 2012-02-01
Category : Technology & Engineering
ISBN : 9781614740179
A Reprint of the Original US Geological Survey Bulletin 1348. This publication is a catalog of locations, geology, and production from the placer districts of New Mexico. Over 40 New Mexico Placer locations covered in this publication.
Author : Sophie Decrée
Publisher : John Wiley & Sons
Page : 272 pages
File Size : 42,79 MB
Release : 2019-04-23
Category : Science
ISBN : 1119290538
The latest knowledge on mineral ore genesis and the exploration of ore deposits Global demand for metals has risen considerably over the past decade. Geologists are developing new approaches for studying ore deposits and discovering new sources. Ore Deposits: Origin, Exploration, and Exploitation is a compilation of diverse case studies on new prospects in ore deposit geology including atypical examples of mineral deposits and new methods for ore exploration. Volume highlights include: Presentation of the latest research on a range of ore deposit types Application of ore deposits to multiple areas of geology and geophysical exploration Emphasis on diverse methods and tools for the study of ore deposits Useful case studies for geologists in both academia and industry Ore Deposits: Origin, Exploration, and Exploitation is a valuable resource for economic geologists, mineralogists, petrologists, geochemists, mining engineers, research professionals, and advanced students in relevant areas of academic study. Read an interview with the editors to find out more: https://eos.org/editors-vox/developments-in-the-continuing-search-for-new-mineral-deposits
Author : John Calvert (Mineral Surveyor.)
Publisher :
Page : 364 pages
File Size : 28,89 MB
Release : 1853
Category :
ISBN :
Author : David A. John
Publisher :
Page : 276 pages
File Size : 34,12 MB
Release : 1998
Category : Geology
ISBN :