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Papers by Stephen Reynolds

Research paper thumbnail of Spectacular Field-Trip Localities in the Maria Fold and Thrust Belt, Western Arizona and Southeastern California

Abstracts with programs, 2018

Research paper thumbnail of Geologic map of the Little Harquahala Mountains, west-central Arizona

The Little Harquahala Mountains of west—central Arizona contain major Mesozoic thrust faults that... more The Little Harquahala Mountains of west—central Arizona contain major Mesozoic thrust faults that juxtapose a complex assemblage of Mesozoic sedimentary and volcanic rocks, Paleozoic cratonic strata, and Jurassic and Precambrian crystalline rocks. The structurally ...

Research paper thumbnail of Digital Graphics Files for the Geologic Map of Arizona, a representation of Arizona Geological Survey Map 35, v. 1.0

Research paper thumbnail of Geologic Map of the Vulture Mine Area, Vulture Mountains, West-Central Arizona

Research paper thumbnail of Geologic map and cross section across the boundary between the Colorado Plateau and the Basin and Range southwest of Bagdad, Arizona

Research paper thumbnail of Reconnaissance geology of the crest of the Sierra Estrella, central Arizona

A reconnaissance study of the crest of the northwest-trending Sierra Estrella in central Arizona ... more A reconnaissance study of the crest of the northwest-trending Sierra Estrella in central Arizona indicates that this range is composed primarily gneiss and schist with a steeply dipping, northwest-striking foliation similar to that in 1.6-1.7 b.y.-old metamorphic rocks elsewhere in Arizona. Granitic rocks with a concordant foliation form sills and large intrusions into the schist and gneiss, and are thought to be approximately the same age as metamorphism and deformation. Younger, weakly foliated to unfoliated granitic rocks are exposed at the south end of the range, and are probably correlative with the widespread 1.4 b.y. old anorogenic granite suite of North America.

Research paper thumbnail of Geologic map of the Artillery and Rawhide Wash 7.5' minute Quadrangles, Mohave and La Paz Counties, Arizona (v. 2.0)

The Artillery Peak and Rawhide Wash 7 ½' Quadrangles are located in southern Mohave County an... more The Artillery Peak and Rawhide Wash 7 ½' Quadrangles are located in southern Mohave County and northern La Paz County in western Arizona, and encompass Alamo Lake reservoir at the confluence of the Santa Maria and Big Sandy Rivers. New geologic mapping and map compilation for the two quadrangles, presented here, was done under the joint State-Federal STATEMAP program, as specified by the National Geologic Mapping Act of 1992, and was jointly funded by the Arizona Geological Survey and the U.S. Geological Survey under STATEMAP assistance award G11AC20455. This map was compiled digitally using ESRI ArcGIS software. The Artillery Mountains and the northeastern flank of the Rawhide Mountains were partially mapped by Lasky and Webber (1949) and by Spencer et al. (1989). The northwestern part of the Rawhide Mountains was mapped by Yarnold and McDaniel (1992), and the entire range was mapped by Shackelford (1989). Two areas in the Rawhide Mountains were mapped in detail by Scott (2004). New mapping was done in unmapped areas, and to field check and improve mapping in previously mapped areas. Mapping by Lasky and Webber was not done on a modern topographic base, and their study area was almost entirely remapped. Previous mapping did not significantly differentiate Quaternary map units. For this mapping investigation, Quaternary units were differentiated in detail for entire map area. Georeferenced aerial-photograph imagery was used extensively for mapping Quaternary deposits.DGM-100 version 2.0 map sheets 1 and 2 were released on March 16, 2015.Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu

Research paper thumbnail of Geologic map of the Bouse and Ibex Peak 7 ½ ’ Quadrangles, La Paz County, Arizona v 2.0

The Bouse and Ibex Peak 7.5 minute quadrangles are located approximately 40 km south-southeast of... more The Bouse and Ibex Peak 7.5 minute quadrangles are located approximately 40 km south-southeast of the town of Parker in La Paz County, western Arizona. The Quadrangles encompass the northern Plomosa Mountains and flanking piedmonts, as well as part of upper Bouse Wash, the town of Bouse, and the southern edge of Cactus Plain. Geologic mapping was completed under the joint State-Federal STATEMAP programs as specified in the National Geologic Mapping Act of 1992, and was jointly funded by the Arizona Geological Survey and the U.S. Geological Survey under STATEMAP assistance award #G12AC20464.

Research paper thumbnail of Reconnaissance geologic map of the Merritt Hills, southwestern Yavapai County, Arizona

Reconnaissance geologic map of the Merritt Hills, southwestern Yavapai County, Arizona. Map scale... more Reconnaissance geologic map of the Merritt Hills, southwestern Yavapai County, Arizona. Map scale 1:24,000Documents in the AZGS Documents Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu)

Research paper thumbnail of Detailed geologic map and cross sections of the Big Horn and Belmont Mountains, West-central Arizona

Arizona Geological Survey (Tucson, AZ), 1994

The principal geologic feature of the Big Hom and Belmont Mountains is a complexly faulted and ti... more The principal geologic feature of the Big Hom and Belmont Mountains is a complexly faulted and tilted series of mostly Miocene volcanic rock that record a period of Middle Tertiary magmatism and extension. These volcanic rocks vary widely in composition, but basaltic and rhyolitic rocks are most abundant (Figure 1). Intrusive equivalents of these volcanics exposed in the Belmont Mountains are dominantly granitic. Despite the large volume of rhyolite erupted, small, coalescing flow and dome complexes were formed in preference to large-volume ash-flow tuffs, and no collapse calderas were formed. These rocks lie in the upper plate ofthe regional Whipple-Buckskin-Bullard detachment fault [Rehrig and Reynolds, 1980], at its southeastern tip [Richard et aI, 1990a]. A regional boundary between major tilts domains in Tertiary strata follows an irregular course from northwest to southeast through the range [Rehrig et aI., 1980]. Northeast of this boundary, strata dip to the northeast, and southwest of the boundary, Tertiary strata dip to the southwest. Pre-Tertiary rocks are exposed in several parts of the range. These rocks consist of a Laramide-age (71-63 Ma)hornblende-biotite granodiorite, informally referred to as the Big Hom granodiorite, which intrudes a complex of Proterozoic igneous and metamorphic rocks. Metamorphic grade in the Proterozoic rocks increases from southeast to northwest, and associated igneous rocks become more abundant to the northwest. In the southeast the Proterozoic rocks consist of highly deformed, greenschist facies, mafic and pelitic schist. These grade to heterogeneous mafic-tointermediate- composition gneiss to the northwest. Report with geologic map and cross sections of the Big Horn and Belmont Mountains, west-central Arizona. Scale 1:50,000.Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu

Research paper thumbnail of Geologic map of the Wickenburg, Southern Buckhorn, and Northwestern Hieroglyphic Mountains, central Arizona

This report describes the geology of the Red Picacho quadrangle and parts of the Wickenburg, Garf... more This report describes the geology of the Red Picacho quadrangle and parts of the Wickenburg, Garfias Mountain, and Wittman quadrangles. The map area comprises metamorphic-plutonic basement unconformably overlain by Tertiary volcanic and sedimentary rocks. Geologic map of the Wickenburg, Southern Buckhorn, and Northwestern Hieroglyphic Mountains, central Arizona Scale 1:24,000, with report.Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu

Research paper thumbnail of Control of Mineralization by Mesozoic and Cenozoic Low-Angle Structures in West-Central Arizona

Research paper thumbnail of Geologic Map of the Northeastern Vulture Mountains and Vicinity, Central Arizona

Research paper thumbnail of Geologic Map and Sections of the Granite Wash Mountains, West-Central Arizona

M-30-Geologic Map and Sections of the Granite Wash Mountains, West-Central Arizona 1991, scale 1:... more M-30-Geologic Map and Sections of the Granite Wash Mountains, West-Central Arizona 1991, scale 1:24,000. Color.Documents in the AZGS Documents Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu)

Research paper thumbnail of Patterns in the development of extensional fault-block shapes from comparison of outcrop-scale faults and experimental physical models

Elsevier eBooks, 1992

Abstract The geometry and kinematics of normal fault blocks and subsidiary faults within fault bl... more Abstract The geometry and kinematics of normal fault blocks and subsidiary faults within fault blocks are illustrated by centimeter-to meter-scale faults in an exposure of Tertiary sedimentary rocks in Arizona and are interpreted using results from previously published physical models. In map view, the outcrop fault population consists of anastomosing curved and planar faults. In cross-section there are planar faults and curved faults with either smooth or abrupt (ramp-flat) curvature. The fault patterns resemble those of physical models and larger faults in other extended terrains. Ramp-flat faults with planar and curved faults and tilt-block domains are the most prominent structures. Ramp-flat geometry prevails where faults intersect bedding at low angles. Rats are commonly zones of distributed faults rather than a simple throughgoing fault. In tilt-block arrays curved faults that are convex-up are as numerous as concave up (listric) faults and contribute to the overall geometry of the fault array. Subsidiary planar and curved faults prevail in the toes of tilt blocks, whereas horst-and-graben patterns occur in the less faulted block interiors. Internal deformation of rollover structures due to both accommodation and extension of the upper plate was accomplished mainly by slip on arrays of smaller faults in synthetic tilt-block arrays and by crisscrossing horst-and-graben-bounding faults.

Research paper thumbnail of Cenozoic Extension and Magmatism in Arizona

Research paper thumbnail of Geology and Mineral Resources of the Buckskin and Rawhide Mountains, West Central Arizona

The text and geologic maps that compose Bulletin 198 represent a major advance in our understandi... more The text and geologic maps that compose Bulletin 198 represent a major advance in our understanding of the geology and mineral resources of west-central Arizona. The Buckskin and Rawhide Mountains, along with the adjacent Harcuvar and Harquahala Mountains, are one of the approximately 25 metamorphic core complexes in western North America. The geology of the Buckskin and Rawhide Mountains is dominated by the BuckskinRawhide detachment fault, a subhorizontal, undulating normal fault. Detachment faults are characteristic features of metamorphic core complexes. Improved understanding of detachment faults is critical in formulating more accurate models of the genesis of mineral deposits in Arizona. 279 p.Released to the online Arizona Geological Survey on 29 July 2016.Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu

Research paper thumbnail of Geology and production of Middle Tertiary Mineral Districts in Arizona

Page 1. GEOLOGY AND PRODUCTION OF MIDDLE TERTIARY MINERAL DISTRICTS IN ARIZONA BY: JOHN W. WELTY ... more Page 1. GEOLOGY AND PRODUCTION OF MIDDLE TERTIARY MINERAL DISTRICTS IN ARIZONA BY: JOHN W. WELTY JON E. SPENCER GEORGE B. ALLEN STEPHEN J. REYNOLDS RICHARD A. TRAPP Arizona Bureau ...

Research paper thumbnail of Digital Representation of the Geological Map of the Phoenix South 30' x 60' Quadrangle, Central Arizona V 2.0

Folder containing the ESRI personal geodatabase, which is a Microsoft Access .mdb file, and relat... more Folder containing the ESRI personal geodatabase, which is a Microsoft Access .mdb file, and related documents. These are copies of Arizona Geological Survey databases that are used for compilation and archiving of geologic information. The data structure is a relational implementation of an object model, and will require some study to utilize. The databases are included for advanced users interested in a more content rich geologic database implementation. Contact AZGS for more information.

Research paper thumbnail of Ore Grades for Metallic Mineral Districts of Arizona

This report provides average grades for all metallic mineral districts of Arizona. Metallic miner... more This report provides average grades for all metallic mineral districts of Arizona. Metallic mineral districts were defined by Keith and others (1983a,b) as a means to classify mineral occurrences by virtue of their geologic and metallogenic characteristics, rather than the geographic parameters used in a traditional mining-district classification. The mineral districts are not intended to circumvent traditional mining districts, but rather to provide a more scientific and rational means of studying mineral occurrences and to determine the geologic interrelationships among mines, prospects, and discoveries.Documents in the AZGS Documents Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu)

Research paper thumbnail of Spectacular Field-Trip Localities in the Maria Fold and Thrust Belt, Western Arizona and Southeastern California

Abstracts with programs, 2018

Research paper thumbnail of Geologic map of the Little Harquahala Mountains, west-central Arizona

The Little Harquahala Mountains of west—central Arizona contain major Mesozoic thrust faults that... more The Little Harquahala Mountains of west—central Arizona contain major Mesozoic thrust faults that juxtapose a complex assemblage of Mesozoic sedimentary and volcanic rocks, Paleozoic cratonic strata, and Jurassic and Precambrian crystalline rocks. The structurally ...

Research paper thumbnail of Digital Graphics Files for the Geologic Map of Arizona, a representation of Arizona Geological Survey Map 35, v. 1.0

Research paper thumbnail of Geologic Map of the Vulture Mine Area, Vulture Mountains, West-Central Arizona

Research paper thumbnail of Geologic map and cross section across the boundary between the Colorado Plateau and the Basin and Range southwest of Bagdad, Arizona

Research paper thumbnail of Reconnaissance geology of the crest of the Sierra Estrella, central Arizona

A reconnaissance study of the crest of the northwest-trending Sierra Estrella in central Arizona ... more A reconnaissance study of the crest of the northwest-trending Sierra Estrella in central Arizona indicates that this range is composed primarily gneiss and schist with a steeply dipping, northwest-striking foliation similar to that in 1.6-1.7 b.y.-old metamorphic rocks elsewhere in Arizona. Granitic rocks with a concordant foliation form sills and large intrusions into the schist and gneiss, and are thought to be approximately the same age as metamorphism and deformation. Younger, weakly foliated to unfoliated granitic rocks are exposed at the south end of the range, and are probably correlative with the widespread 1.4 b.y. old anorogenic granite suite of North America.

Research paper thumbnail of Geologic map of the Artillery and Rawhide Wash 7.5' minute Quadrangles, Mohave and La Paz Counties, Arizona (v. 2.0)

The Artillery Peak and Rawhide Wash 7 ½' Quadrangles are located in southern Mohave County an... more The Artillery Peak and Rawhide Wash 7 ½' Quadrangles are located in southern Mohave County and northern La Paz County in western Arizona, and encompass Alamo Lake reservoir at the confluence of the Santa Maria and Big Sandy Rivers. New geologic mapping and map compilation for the two quadrangles, presented here, was done under the joint State-Federal STATEMAP program, as specified by the National Geologic Mapping Act of 1992, and was jointly funded by the Arizona Geological Survey and the U.S. Geological Survey under STATEMAP assistance award G11AC20455. This map was compiled digitally using ESRI ArcGIS software. The Artillery Mountains and the northeastern flank of the Rawhide Mountains were partially mapped by Lasky and Webber (1949) and by Spencer et al. (1989). The northwestern part of the Rawhide Mountains was mapped by Yarnold and McDaniel (1992), and the entire range was mapped by Shackelford (1989). Two areas in the Rawhide Mountains were mapped in detail by Scott (2004). New mapping was done in unmapped areas, and to field check and improve mapping in previously mapped areas. Mapping by Lasky and Webber was not done on a modern topographic base, and their study area was almost entirely remapped. Previous mapping did not significantly differentiate Quaternary map units. For this mapping investigation, Quaternary units were differentiated in detail for entire map area. Georeferenced aerial-photograph imagery was used extensively for mapping Quaternary deposits.DGM-100 version 2.0 map sheets 1 and 2 were released on March 16, 2015.Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu

Research paper thumbnail of Geologic map of the Bouse and Ibex Peak 7 ½ ’ Quadrangles, La Paz County, Arizona v 2.0

The Bouse and Ibex Peak 7.5 minute quadrangles are located approximately 40 km south-southeast of... more The Bouse and Ibex Peak 7.5 minute quadrangles are located approximately 40 km south-southeast of the town of Parker in La Paz County, western Arizona. The Quadrangles encompass the northern Plomosa Mountains and flanking piedmonts, as well as part of upper Bouse Wash, the town of Bouse, and the southern edge of Cactus Plain. Geologic mapping was completed under the joint State-Federal STATEMAP programs as specified in the National Geologic Mapping Act of 1992, and was jointly funded by the Arizona Geological Survey and the U.S. Geological Survey under STATEMAP assistance award #G12AC20464.

Research paper thumbnail of Reconnaissance geologic map of the Merritt Hills, southwestern Yavapai County, Arizona

Reconnaissance geologic map of the Merritt Hills, southwestern Yavapai County, Arizona. Map scale... more Reconnaissance geologic map of the Merritt Hills, southwestern Yavapai County, Arizona. Map scale 1:24,000Documents in the AZGS Documents Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu)

Research paper thumbnail of Detailed geologic map and cross sections of the Big Horn and Belmont Mountains, West-central Arizona

Arizona Geological Survey (Tucson, AZ), 1994

The principal geologic feature of the Big Hom and Belmont Mountains is a complexly faulted and ti... more The principal geologic feature of the Big Hom and Belmont Mountains is a complexly faulted and tilted series of mostly Miocene volcanic rock that record a period of Middle Tertiary magmatism and extension. These volcanic rocks vary widely in composition, but basaltic and rhyolitic rocks are most abundant (Figure 1). Intrusive equivalents of these volcanics exposed in the Belmont Mountains are dominantly granitic. Despite the large volume of rhyolite erupted, small, coalescing flow and dome complexes were formed in preference to large-volume ash-flow tuffs, and no collapse calderas were formed. These rocks lie in the upper plate ofthe regional Whipple-Buckskin-Bullard detachment fault [Rehrig and Reynolds, 1980], at its southeastern tip [Richard et aI, 1990a]. A regional boundary between major tilts domains in Tertiary strata follows an irregular course from northwest to southeast through the range [Rehrig et aI., 1980]. Northeast of this boundary, strata dip to the northeast, and southwest of the boundary, Tertiary strata dip to the southwest. Pre-Tertiary rocks are exposed in several parts of the range. These rocks consist of a Laramide-age (71-63 Ma)hornblende-biotite granodiorite, informally referred to as the Big Hom granodiorite, which intrudes a complex of Proterozoic igneous and metamorphic rocks. Metamorphic grade in the Proterozoic rocks increases from southeast to northwest, and associated igneous rocks become more abundant to the northwest. In the southeast the Proterozoic rocks consist of highly deformed, greenschist facies, mafic and pelitic schist. These grade to heterogeneous mafic-tointermediate- composition gneiss to the northwest. Report with geologic map and cross sections of the Big Horn and Belmont Mountains, west-central Arizona. Scale 1:50,000.Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu

Research paper thumbnail of Geologic map of the Wickenburg, Southern Buckhorn, and Northwestern Hieroglyphic Mountains, central Arizona

This report describes the geology of the Red Picacho quadrangle and parts of the Wickenburg, Garf... more This report describes the geology of the Red Picacho quadrangle and parts of the Wickenburg, Garfias Mountain, and Wittman quadrangles. The map area comprises metamorphic-plutonic basement unconformably overlain by Tertiary volcanic and sedimentary rocks. Geologic map of the Wickenburg, Southern Buckhorn, and Northwestern Hieroglyphic Mountains, central Arizona Scale 1:24,000, with report.Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu

Research paper thumbnail of Control of Mineralization by Mesozoic and Cenozoic Low-Angle Structures in West-Central Arizona

Research paper thumbnail of Geologic Map of the Northeastern Vulture Mountains and Vicinity, Central Arizona

Research paper thumbnail of Geologic Map and Sections of the Granite Wash Mountains, West-Central Arizona

M-30-Geologic Map and Sections of the Granite Wash Mountains, West-Central Arizona 1991, scale 1:... more M-30-Geologic Map and Sections of the Granite Wash Mountains, West-Central Arizona 1991, scale 1:24,000. Color.Documents in the AZGS Documents Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu)

Research paper thumbnail of Patterns in the development of extensional fault-block shapes from comparison of outcrop-scale faults and experimental physical models

Elsevier eBooks, 1992

Abstract The geometry and kinematics of normal fault blocks and subsidiary faults within fault bl... more Abstract The geometry and kinematics of normal fault blocks and subsidiary faults within fault blocks are illustrated by centimeter-to meter-scale faults in an exposure of Tertiary sedimentary rocks in Arizona and are interpreted using results from previously published physical models. In map view, the outcrop fault population consists of anastomosing curved and planar faults. In cross-section there are planar faults and curved faults with either smooth or abrupt (ramp-flat) curvature. The fault patterns resemble those of physical models and larger faults in other extended terrains. Ramp-flat faults with planar and curved faults and tilt-block domains are the most prominent structures. Ramp-flat geometry prevails where faults intersect bedding at low angles. Rats are commonly zones of distributed faults rather than a simple throughgoing fault. In tilt-block arrays curved faults that are convex-up are as numerous as concave up (listric) faults and contribute to the overall geometry of the fault array. Subsidiary planar and curved faults prevail in the toes of tilt blocks, whereas horst-and-graben patterns occur in the less faulted block interiors. Internal deformation of rollover structures due to both accommodation and extension of the upper plate was accomplished mainly by slip on arrays of smaller faults in synthetic tilt-block arrays and by crisscrossing horst-and-graben-bounding faults.

Research paper thumbnail of Cenozoic Extension and Magmatism in Arizona

Research paper thumbnail of Geology and Mineral Resources of the Buckskin and Rawhide Mountains, West Central Arizona

The text and geologic maps that compose Bulletin 198 represent a major advance in our understandi... more The text and geologic maps that compose Bulletin 198 represent a major advance in our understanding of the geology and mineral resources of west-central Arizona. The Buckskin and Rawhide Mountains, along with the adjacent Harcuvar and Harquahala Mountains, are one of the approximately 25 metamorphic core complexes in western North America. The geology of the Buckskin and Rawhide Mountains is dominated by the BuckskinRawhide detachment fault, a subhorizontal, undulating normal fault. Detachment faults are characteristic features of metamorphic core complexes. Improved understanding of detachment faults is critical in formulating more accurate models of the genesis of mineral deposits in Arizona. 279 p.Released to the online Arizona Geological Survey on 29 July 2016.Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu

Research paper thumbnail of Geology and production of Middle Tertiary Mineral Districts in Arizona

Page 1. GEOLOGY AND PRODUCTION OF MIDDLE TERTIARY MINERAL DISTRICTS IN ARIZONA BY: JOHN W. WELTY ... more Page 1. GEOLOGY AND PRODUCTION OF MIDDLE TERTIARY MINERAL DISTRICTS IN ARIZONA BY: JOHN W. WELTY JON E. SPENCER GEORGE B. ALLEN STEPHEN J. REYNOLDS RICHARD A. TRAPP Arizona Bureau ...

Research paper thumbnail of Digital Representation of the Geological Map of the Phoenix South 30' x 60' Quadrangle, Central Arizona V 2.0

Folder containing the ESRI personal geodatabase, which is a Microsoft Access .mdb file, and relat... more Folder containing the ESRI personal geodatabase, which is a Microsoft Access .mdb file, and related documents. These are copies of Arizona Geological Survey databases that are used for compilation and archiving of geologic information. The data structure is a relational implementation of an object model, and will require some study to utilize. The databases are included for advanced users interested in a more content rich geologic database implementation. Contact AZGS for more information.

Research paper thumbnail of Ore Grades for Metallic Mineral Districts of Arizona

This report provides average grades for all metallic mineral districts of Arizona. Metallic miner... more This report provides average grades for all metallic mineral districts of Arizona. Metallic mineral districts were defined by Keith and others (1983a,b) as a means to classify mineral occurrences by virtue of their geologic and metallogenic characteristics, rather than the geographic parameters used in a traditional mining-district classification. The mineral districts are not intended to circumvent traditional mining districts, but rather to provide a more scientific and rational means of studying mineral occurrences and to determine the geologic interrelationships among mines, prospects, and discoveries.Documents in the AZGS Documents Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu)