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Mineral Resource.S of the Ragged Top Wilderness Study Area, Pima Countyt,Arizona

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Mineral Resource.S of the Ragged Top Wilderness Study Area, Pima Countyt,Arizona Mineral Resource.s of the Ragged Top Wilderness Study Area, Pima Countyt,Arizona ' - . I • - U.S. GEOLOGICAL SU.RVEY BULLETIN 1702-H ARIZONA • AVAILABILITY OF BOOKS AND MAPS OF THE U.S. GEOLOGICAL SURVEY Instructions on ordering publications of the U.S. Geological Survey, along with prices of the last offerings, are given in the cur­ rent-year issues qf the monthly catalog "New Publications of the U.S. Geological Survey." Prices of available U.S. Geological Sur­ vey publications released prior to the current year are listed in the most recent annual "Price and Availability List" Publications that are listed in various U.S. Geological Survey catalogs (see back inside cover) but not listed in the most recent annual "Price and Availability List" are no longer available. Prices of reports released to the open files are given in the listing "U.S. Geological Survey Open-File Reports," updated month­ ly, which is for sale in microfiche from the U.S. Geological Survey, Books and Open-File Reports Section, Federal Center, Box 25425, Denver, CO 80225. Reports released through the NTIS may be obtained by writing to the National Technical Information Service, U.S. Department of Commerce, Springfield, VA 22161; please include NTIS report number with inquiry. Order U.S. Geological Survey publications by mail or over the counter from the offices given below. BY MAIL OVER THE COUNTER Books BOOk$ Professional Papers, Bulletins, Water-Supply Papers, Techniques of Water-Resources Investigations, Circulars, publications of general in­ Books of the U.S. Geological Survey are available over the terest (such as leaflets, pamphlets, booklets), single copies of Earthquakes counter at the following Geological Survey Public Inquiries Offices, all & Volcanoes, Preliminary Determination of Epicenters, and some mis­ of which are authorized agents of the Superintendent of Documents: cellaneous reports, including some of the foregoing series that have gone out of print at the Superintendent of Documents, are obtainable by mail from • WASHINGTON, D.C.--Main Interior Bldg., 2600 corridor, 18th and C Sts., NW. U.S. Geological Survey, Books and Open-File Reports • DENVER, Colorado--Federal Bldg., Rm. 169, 1961 Stout St. Federal Center, Box 25425 • LOS ANGELES, California--Federal Bldg., Rm. 7638, 300 N. Denver, CO 80225 Los Angeles St. • MENLO PARK, California--Bldg. 3 (Stop 533), Rm. 3128, Subscriptions to periodicals (Earthquakes & Volcanoes and 345 Middlefield Rd. Preliminary Determination of Epicenters) can be obtained ONLY from • RESTON, Vlrglnla--503 National Center, Rm. 1C402, 12201 the Sunrise Valley Dr. • SALT LAKE CITY, Utah--Federal Bldg., Rm. 8105, 125 Superintendent of Documents South State St. Government Printing Omce • SAN FRANCISCO, California--Customhouse, Rm. 504, 555 Washington, D.C. 20402 Battery St. • SPOKANE, Washington--U.S. Courthouse, Rm. 678, West (Check or money order must be payable to Superintendent of Docu­ 920 Riverside Ave .. ments.) • ANCHORAGE, Alaska--Rm. 101.4230 University Dr. • ANCHORAGE, Alaska--Federal Bldg, Rm. E-146, 701 C St. Maps For maps, address mail orders to U.S. Geological Survey, Map Distribution Maps Federal Center, Box 25286 Maps may be purchased over the counter at the U.S. Geologi­ Denver, CO 80225 cal Survey offices where books are sold (all addresses in above list) and at the following Geological Survey offices: Residents of Alaska may order maps from • ROLLA, Mlssourl--1400 Independence Rd. Alaska Distribution Section, U.S. Geological Survey, • DENVER, Colorado--Map Distribution. Bldg. 810, Federal New Federal Building - Box 12 Center 101 Twelfth Ave., Fairbanks, AK 99701 • FAIRBANKS, Alaska--New Federal Bldg., 101 Twelfth Ave. Chapter H Mineral Resources of the Ragged Top Wilderness Study Area, Pima County, Arizona By GARY A. NOWLAN, JOCELYN A. PETERSON, .JAMES A. PITKIN, and WILLIAM F. HANNA U.S. Geological Survey TERRY J. KREIDLER U.S. Bureau of Mines U.S. GEOLOGICAL SURVEY BULLETIN 1702 MINERAL RESOURCES OF WILDERNESS STUDY AREAS: SOUTHWESTERN AND SOUTH-CENTRAL ARIZONA DEPARTMENT OF THE INTERIOR MANUEL LUJAN, JR., Secretary U.S. GEOLOGICAL SURVEY Dallas L. Peck, Director Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1989 For sale by the Books and Open-File Reports Section U.S. Geological Survey Federal Center, Box 25425 Denver, CO 80225 Library of Congress Cataloging-in-Publication Data Mineral resources of the Ragged Top Wilderness Study Area, Pima County, Arizona I by Gary A. Nowlan ... [et al.] p. em. -(Mineral resources of wilderness study areas- southwestern and south-central Arizona ; ch. H)(U.S. Geological Survey bulletin ; 1702-H) Bibliography: p. Supt. of Docs. no. : I 19.3:1702-H 1. Mines and mineral resources-Arizona-Ragged Top Wilderness. 2. Ragged Top Wilderness (Ariz.) I. Nowlan, G.A. II. Series. Ill. Series: U.S.· Geological Survey bulletin ; 1702-H. QE75.89 no. 1702-H 557.3 s-dc20 89-600134 [TN24.A6] [553 1.09791 1.77] CIP STUDIES RELATED TO WILDERNESS Bureau of Land Management Wilderness Study Areas The Federal Land Policy and Management Act (Public Law 94-579, October 21, 1976) requires the U.S. Geological Survey and the U.S. Bureau of Mines to conduct mineral surveys on certain areas to determine the mineral values, if any, that may be present. Results must be made available to the public and .be submitted to the President and the Congress. This report presents the results of a mineral survey of the Ragged Top Wilderness Study Area (AZ-020-197), Pima County, Arizona. CONTENTS Summary Hl Abstract Hl Character and setting Hl Identified resources Hl Mineral resource potential H3 Introduction H3 Character and setting H3 Previous investigations H4 Present study H4 Acknowledgments H4 Appraisal of identified resources H4 Mining and leasing activity H4 Appraisal of sites examined HS Ragged Top mine HS Barite prospects HS Other prospects H6 Sand and gravel H7 Summary H7 Assessment of mineral resource potential H7 Geology H7 Geochemistry Hll Geophysics Hl4 Gravity and aeromagnetic data H14 Aerial gamma-ray spectr9metry HlS Mineral and energy resource potential HlS Vein deposits HlS Porphyry copper deposits H16 Uranium in the Apache Group H16 Thorium, rare-earth elements, quartz, feldspar, and mica in granite H16 Energy resources H16 References cited Hl6 Appendixes Definition of levels of mineral resource potential and certainty of assessment H20 Resource/reserve classification H21 Geologic time chart H22 FIGURES 1. Index map showing location of Ragged Top Wilderness Study Area, Pima County, Arizona H2 2. Map showing mineral resource potential, geology, U.S. Bureau of Mines sampling sites, and locations of mines and prospects of Ragged Top Wilderness Study Area H8 3. Map showing stream-sediment and rock sample sites and areas of geochemical anomalies, Ragged Top Wilderness Study Area H12 4. Bouguer gravity anomaly map of Ragged Top Wilderness Study Area H14 5. Aeromagnetic map of Ragged Top Wilderness Study Area Hl4 Contents V TABLES 1. Selected geochemical data for U.S. Bureau of Mines samples from mines and prospects in and near Ragged Top Wilderness Study Area, Pima County, Arizona H6 2. Geochemical statistics for elements present in anomalous amounts in drainage-basin samples collected in 1987 in and near Ragged Top Wilderness Study Area, Pima County, Arizona H13 VI Contents Mineral Resources of the Ragged Top Wilderness Study Area, Pima County, Arizona By Gary A. Nowlan, Jocelyn A. Peterson, James A. Pitkin,- and William F. Hanna U.S. Geological Survey Terry J. Kreidler U.S. Bureau of Mines SUMMARY accessory minerals in Proterozoic granite and for quartz, feldspar, and mica for industrial uses in pegmatites within granite. The study area has no potential for oil and gas or for Abstract geothermal energy resources. The Ragged Top Wilderness Study Area (AZ- 020-197), Character and Setting for which mineral surveys were requested by the U.S. Bureau of Land Management, encompasses 4,460 acres in south­ central Arizona. Throughout this report, "study area" in­ The Ragged Top Wilderness Study Area (AZ- cludes the wilderness study area and adjacent terrain where 020-197) (fig. 1) is located about 35 mi northwest of samples were collected. Field work was carried out in 1987 Tucson, Ariz., on the northeast side of the Silver Bell by the U.S. Bureau of Mines and the U.S. Geological Survey Mountains, a small range within the Basin and Range to appraise the identified (known) resources and assess the physiographic province. The study area lies partially in the mineral resource potential (undiscovered) of the wilderness study area. The study area includes the northern part of a northern part of the recently identified Silver Bell caldera, mineralized area that includes the Silver Bell porphyry copper which provides the structural setting with which the Silver deposits. Despite this proximity to a major mine and the Bell porphyry copper deposits are associated (Sawyer,· presence of several mines and prospects within and near the 1987). The study area is underlain by Proterozoic (see study area, no metallic resources were identified; exposures of mineralized rock are generally erratic and small. Sand and geologic time chart in "Appendixes") granitic and sedimen­ gravel are present in minor amounts, but they have no unique tary rocks, Cretaceous volcanic rocks and granodiorite por­ qualities and other supplies are closer to markets. phyry, and Tertiary rhyolite. A veneer of pediment gravels Part of the southwest corner of the study area has high covers much of the granite north of Ragged Top. resource potential for gold, silver, lead, vanadium, barite, molybdenum, copper, and zinc in vein deposits. Adjacent parts of the study area to the north, west, and south have Identified Resources moderate resource potentfal for zinc, lead, barite, molybde­ num, gold, silver, and copper in similar veins.
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