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Author: Alain Chauvet Publisher: MDPI ISBN: 3038977845 Category : Science Languages : en Pages : 256
Book Description
"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.
Author: Alain Chauvet Publisher: MDPI ISBN: 3038977845 Category : Science Languages : en Pages : 256
Book Description
"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.
Author: Joseph Dean Zeitler Publisher: ISBN: Category : Gold ores Languages : en Pages : 100
Book Description
The Middle Zone ore body of the Cortez Hills Deposit, located in Lander County, NV, hosts gold mineralization in the Roberts Mountains Formation (Silurian) and the Wenban Limestone (Devonian). This study used drillhole data to create a structural model of the Middle Zone and determine controls on gold mineralization and possible visual indicators of said mineralization. Gold mineralization is located throughout the Middle Zone, but higher grades appear to be concentrated at the base of the Middle Zone in a structurally complex area with thrust faults, listric normal faults and high angle faults. The thrust faults extend throughout the entire Middle Zone and generally strike S45°E and dip between 40°SW-40°NE. The listric faults show at least 50 meters of apparent stratigraphic offset and strike N30°W and dip from near horizontal to 40°SW. The normal faults in the Middle Zone offset stratigraphy between seven and thirteen meters vertically and strike between N30°W and N50°W and dip between 25°SW-35°SW. The evolution of these structures is complex beginning to the northeast of the Middle Zone with a thrust fault and continuing with thrusting to the southwest with the last thrust overprinting the Middle Zone with units 4 and 5 of the Roberts Mountains Formation and all units of the Wenban Limestone. Alteration present in the Middle Zone includes decarbonatization, silicification, sulfidation and oxidation. All types of alteration other than silicification are associated with gold in the Middle Zone, with decarbonatization being most closely associated based upon a preliminary statistical analysis. Gold and alteration are spatially associated with both high angle faults and shallowly dipping thrust and listric normal faults indicating strong structural controls on gold mineralization. Identification of structural features and decarbonatization will assist in determining the distribution of ore during mining of the Middle Zone.
Author: John Jeffrey Geier Publisher: ISBN: Category : Geology Languages : en Pages : 286
Book Description
The Santa Gertrudis Mining District of Sonora, Mexico contains more than a dozen purported Carlin-like, sedimentary-hosted, disseminated-gold deposits. A series of near-surface, mostly oxidized gold deposits were open-pit mined from the calcareous and clastic units of the Cretaceous Bisbee Group. Gold occurs as finely disseminated, sub-micron coatings on sulfides, associated with argillization and silicification of calcareous, carbonaceous, and siliciclastic sedimentary rocks in structural settings. Gold occurs with elevated levels of As, Hg, Sb, Pb, and Zn. Downhole drill data within distal disseminated gold zones reveal a 5:1 ratio of Ag:Au and strong correlations of Au to Pb and Zn. This study explores the timing and structural control of mineralization utilizing field mapping, geochemical studies, drilling, core logging, and structural analysis. Most field evidence indicates that mineralization is related to a single pulse of moderately differentiated, Eocene intrusives described as Mo-Cu-Au skarn with structurally controlled distal disseminated As-Ag-Au.
Author: Alain Chauvet
Author: Alain Chauvet
Author: S. D. G. Campbell
Author: Lyal Harris
Author: Julie V. Rowland
Author: Joseph Dean Zeitler
Author: Christopher C. Bell
Author: Tommy B. Thompson
Author: Ozcan Yigit
Author: T. G. Blenkinsop
Author: John Jeffrey Geier