Download or read book Gold Mineralization in Shear Zones written by Stan White and published by . This book was released on 1987 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Structural Geology Workshops written by Stan H. White and published by . This book was released on 1987 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Regional Structural Model for Gold Mineralization in the Southern Part of the Archean Superior Province United States written by Paul Kibler Sims and published by . This book was released on 1992 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Download or read book Mineralization and Shear Zones written by and published by . This book was released on 1989 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book African Mining 91 written by Institution of Mining and Metallurgy and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second 'African Mining' conference is planned for June 1991, and follows the first, very successful, event held in May 1987. That full four-year period was characterized by substantial changes in the political and economic climate of many countries in both hemispheres. Copper prices were relatively firm, and the advance and steady demand for nickel and ferrochromium stabilized important sectors of the mineral industry, certainly in Zimbabwe. The promise for gold remained unfulfilled, but the smaller, relatively flexible, mines survived and only the large, deep and low-value mines seem seriously at risk. None of this has affected the hungry, and intensive exploitations from surface to the water-table have revealed many targets of promise to those willing to take the risks. The pattern in Southern Africa was extraordinarily stable among the turmoil, with independence for Namibia, adjustments in South Africa and a gradual shift to market economies in the region. The pace of exploration has increased to recover some part of the progress that was lost in the Independence struggle, and atthe end of the first decade in Zimbabwe, for example, oil is being sought in the Zambesi Rift, following the investigation of the Luangwa in Zambia, and there are exciting exploration projects for methane released from coal, deep in its basins.
Download or read book Gold Quartz Veins of the Alleghany District California written by Henry Gardiner Ferguson and published by . This book was released on 1932 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Structural Control of Mineral Deposits written by Alain Chauvet and published by MDPI. This book was released on 2019-04-16 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Structural Control” remains a crucial point that frequently lacks in any scientific and/or economic analysis of ore deposits, whatever their type and class. The case of lode deposits is exemplary, although also other deposits, like breccia pipe, stockwerk, massive sulphides, skarn, etc., can, surprisingly, be concerned. Several concepts like the gold-bearing shear zone have not proven valid during the last few decades in terms of our understanding of gold deposit and have been totally abandoned. Additionally, the relationships between magmatism, regional tectonic context, and mineralization remain uncertain and have been debated in several recent publications. This demonstrates that this issue is still relevant, and its solution may help in the distinction between intrusion-related and orogenic deposits. In this Special Issue, we particularly invite any case study of mineral deposits, in which it has been demonstrated that structural geology may have a significant role in the establishment of the deposit model of formation and/or on exploration and exploitation programs. Examples in which the structural model diverges from those described in the classical literature are particularly welcomed, including studies in which relationships with magmatism can be suspected and/or demonstrated. Indeed, all cases that illustrate concepts that differ from the classic ones and from theoretical models may represent significant contributions to this volume.
Download or read book Gold Mineralization Associated with Shear Zones in Mafic Volcanic Rocks North of Snow Lake Manitoba written by Mark G. Steacy and published by . This book was released on 1982 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Archean Lode Gold Deposits in Ontario written by A. C. Colvine and published by . This book was released on 1988 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gold Metallogeny and Exploration written by B. Foster and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 of all major aspects of gold 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.
Download or read book The Geology Gold Mineralization and Greenstones of the Whisky Knob Area of Eastern Central Victoria written by Jonathan Christian Kelly and published by . This book was released on 1991 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: There are two macroscopic shear zones in the Whisky Knob area. One trends northwest-southeast, parallel to the pronounced structural grain of the area, whilst the second trends approximately east-west and truncates the northwest orientated shear zone. The shear zones display brittle-ductile deformation. Disseminated gold mineralization occurs in rhyolitic bodies hosted by the two shear zones and displays characteristics which are consistent with epithermal mineralization at shallow depth in a high sulphidation system. The mineralization is associated with much pyrite and massive silica. At least three generations of quartz veins, minor breccia pipes and vuggy dissolution cavities can be recognised. The genesis of the mineralization is probably related to the operation of a meteoric water convection cell set in motion by a magmatic heat engine. The greenstones of the Whisky Knob region have affinities with high-magnesium, calc-alkaline orogenic andesites. The greenstones are thought to represent an island arc constructed through the subduction of young hot lithosphere.
Download or read book Contrasting Structural Controls on Gold Mineralization Along the Eldorado Shear Zone Zimbabwe written by T. G. Blenkinsop and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Geology And Gold Mineralization Of The Shabi Shear Zone Shabani District Southern Rhodesia written by Morris Hugh C. and published by . This book was released on 1968 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Turbidite hosted Gold Deposits written by J. Duncan Keppie and published by St. John's, Nfld., Canada : Geological Association of Canada. This book was released on 1986 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gold Mineralization in the Menzies Kambalda Region Eastern Goldfields Western Australia written by W. K. Witt and published by . This book was released on 1993 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: Battye accession number 015139, 015139A.
Download or read book Structural Controls of Gold Mineralization in the Zimbabwe Craton Exploration Guidelines written by S. D. G. Campbell and published by . This book was released on 1994 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gold 86 written by Alasdair James Macdonald and published by . This book was released on 1986 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt:
