This description of the minerals of Arizona has been compiled largely from publications and manuscripts. Numerous persons were also consulted regarding undescribed mineral deposits and occurrences, and a great deal of valuable information was obtained from these sources.

This report summarizes the mineral and water resources of Arizona. Its purpose is to give factual information about the present supplies of minerals and water in the State and present a realistic appraisal of the supplies that are available for future exploitation. The report is intended mainly for use by governmental officials and agencies, by leaders in industry and commerce, and by schools and the lay public. Specialists in the fields of mineral commodities and water may not find much that is new to them, but it is hoped that they will at least find the report a useful compendium. References to pertinent sources of additional information are cited in the text and listed at the end of each section of the report.

This report is designed to serve as a brief, general account of the geology and mineral deposits of Arizona, especially in connection with the County Geologic Maps of Arizona*, Geo(ogic Cross-Sections*, Outcrop Maps*, Map of Known Metallic Mineral Occurrences of Arizona*, Map of Known Nonmetallic Mineral Occurrences of Arizona *, and Map and Index of Arizona Mining Districts*.

The purpose of these investigations is to document and map the extent of Holocene channel and floodplain alluvium associated with the Verde River in central Arizona. Mapping completed in this study may be used by Arizona Department of Water Resources (ADWR) staff as part of their effort to delineate subflow zones in the Verde River Watershed. Geologic mapping is a primary function of the Arizona Geological Survey (AZGS), so in cooperation with ADWR staff we have established procedures and protocols for documenting and mapping the extent of Holocene floodplain alluvium along rivers in Arizona. 54 p. report and 10 maps on 5 plates

Map 6 shows the mining districts and prominent mining localities of Arizona. It is now out-of-print and superseded by Map 18, Metallic Mineral Districts of Arizona. Map scale 1:1,000,000.

Chino Valley North 7 ½' Quadrangle covers portions of Big Chino Valley and Chino Valley and the uppermost reach of the Verde River, and includes the towns of Chino Valley and southern Paulden. These valleys are flanked by bedrock of Sullivan Buttes to the west and southwest and the westernmost portion of Black Hills to the north and northeast. The Verde River is fed by significant tributaries Big Chino Wash, Williamson Valley Wash, Chino Wash, Granite Creek and Lonesome Valley Wash (Figure 1). Production of this new geologic map continues the Arizona Geological Survey mapping program of the Verde River valley. This mapping was done under the joint State-Federal STATEMAP program, 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 Program Contract award number 08HQAG0093. Mapping was compiled digitally using ESRI ArcGIS software. The Chino Valley North Quadrangle was mapped previously by Krieger (1965). This mapping depicts the bedrock geology of the northwestern most part of the Black Hills and a small part of the Sullivan Buttes. Much of the mapping effort was focused on the late Cenozoic geology of the region, especially Quaternary units within and along the Chino Valley basin, with special attention to differences between the major drainage networks (Big Chino Wash, Chino Valley Wash and Granite Creek. New mapping also revealed a newly discovered Quaternary fault that flanks the western boundary of the Black Hills.

The Verde River drainage is a major river system that heads in Big Chino Valley in north central Arizona, flows generally southeast through the rugged terrain of central Arizona, and empties into the Salt River east of the Phoenix metropolitan area. It is unusual in Arizona because much the main channel of the Verde River is perennial for much its length. Data summarized in this report were gathered to aid in the assessment of the navigability of the Verde River in February, 1912, when Arizona became a State. These investigations were conducted in cooperation with CH2MHill and were funded by the Arizona State Land Department. The purposes of this report are to (1) outline the geologic and geomorphic framework of the Verde River, (2) to describe the physical character of the channel of the Verde River, and (3) to evaluate how channel morphology and position have changed in the past century.

The primary criteria for selection of boundaries are geology and topography, in a few instances political boundaries were used 2) The lower Colorado River Valley extends along the Colorado River from Hoover Dam to the U.S -Mexican border; it also Includes the lowland areas along the Colorado River such as Mohave Valley and Clbola Valley, which are delineated by dashed lines and considered subdivisions of the Lower Colorado River Valley.

Arizona has suffered relatively modest amounts of damage and destruction resulting from earthquake shaking during its historical period. There is cause to be concerned about earthquake hazards in Arizona, however. Many earthquakes ranging in magnitude up to about 6 have occurred within Arizona, and portions of the State have experienced strong shaking resulting from earthquakes that occurred in California and Mexico. Geologic investigations indicate that at least 20 faults in Arizona have been active in the past 100,000 years, and thus may be considered potential sources for large earthquakes. This bibliography represents an attempt to develop a reasonably comprehensive list of references pertaining to all aspects of earthquake hazards in Arizona. We hope that this bibliography will be useful for planners, engineers, scientists, emergency-management officials, and government agencies concerned about earthquake hazards in Arizona. In addition to the bibliography, we provide a short summary of seismic hazard in Arizona after this introduction.

In 1992 the Arizona Geological Survey (AZGS) organized a repository in which drill core that the AZGS has accumulated through donations is stored and available for public inspection. The repository is presently located in the basement of the Corbett Building (210 E. 7th Street) in Tucson, Arizona. Core samples in the facility represent almost 300 individual drill holes and approximately 150,000 linear feet of hole. All the core has been skeletonized (either by the donor or by AZGS geologists) to varying degrees, with from 20% to less than 1 % of the original core retained. Fourteen of Arizona's fifteen counties are represented in the storage facility by at least one drill hole, with Apache, Cochise, Maricopa, and Mohave Counties represented by the most individual holes. The core was produced during various projects ranging from geotechnical site assessments to metallic mineral exploration.