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f** ' ':". _ gy of Cot atidnal' Forest, > Southeastern Arizona, and; ,' Southwesternr*~' f '' New' MexicoV ' * *^* *" 4. ^ »-»-->JS»; f ^ U.S. GEOLOGICAL SURVEY BULLEf IN 2083-A-K ftepared in cooperation with tHe U.S. Torest Service 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 current-year issues of the monthly catalog "New Publications of the U.S. Geological Survey." Prices of available U.S. Geological Survey publications re leased prior to the current year are listed in the most recent annual "Price and Availability List." Publications that may be listed in various U.S. Geological Survey catalogs (see back inside cover) but not listed in the most recent annual "Price and Availability List" may no longer be available. 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 listed below. BY MAIL OVER THE COUNTER Books Books and Maps Professional Papers, Bulletins, Water-Supply Papers, Tech Books and maps of the U.S. Geological Survey are available niques of Water-Resources Investigations, Circulars, publications over the counter at the following U.S. Geological Survey offices, all of general interest (such as leaflets, pamphlets, booklets), single of which are authorized agents of the Superintendent of Docu copies of Earthquakes & Volcanoes, Preliminary Determination of ments. Epicenters, and some miscellaneous reports, including some of the foregoing series that have gone out of print at the Superintendent of Documents, are obtainable by mail from ANCHORAGE, Alaska-Rm. 101, 4230 University Dr. U.S. Geological Survey, Information Services LAKEWOOD, Colorado-Federal Center, Bldg. 810 Box 25286, Federal Center Denver, CO 80225 MENLO PARK, California-Bldg. 3, Rm. 3128, 345 Middlefield Rd. Subscriptions to periodicals (Earthquakes & Volcanoes and Preliminary Determination of Epicenters) can be obtained ONLY RESTON, Virginia-USGS National Center, Rm. 1C402, from the 12201 Sunrise Valley Dr. Superintendent of Documents SALT LAKE CITY, Utah-Federal Bldg., Rm. 8105, Government Printing Office 125 South State St. Washington, DC 20402 SPOKANE, Washington-U.S. Post Office Bldg., Rm. 135, (Check or money order must be payable to Superintendent of West 904 Riverside Ave. Documents.) WASHINGTON, D.C.-Main Interior Bldg., Rm. 2650, Maps 18th and CSts.. NW. For maps, address mail orders to Maps Only U.S. Geological Survey, Information Services Maps may be purchased over the counter at the following Box 25286, Federal Center U.S. Geological Survey offices: Denver, CO 80225 Residents of Alaska may order maps from FAIRBANKS, Alaska-New Federal Bldg, 101 Twelfth Ave. U.S. Geological Survey, Earth Science Information Center ROLLA, Missouri-1400 Independence Rd. 101 Twelfth Ave., Box 12 Fairbanks, AK 99701 STENNIS SPACE CENTER, Mississippi-Bldg. 3101 Mineral Resource Potential and Geology of Coronado National Forest, Southeastern Arizona and Southwestern New Mexico Edited by Edward A. du Bray U.S. GEOLOGICAL SURVEY BULLETIN 2083-A-K Prepared in cooperation with the U.S. Forest Service UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1996 U.S. DEPARTMENT OF THE INTERIOR BRUCE BABBITT, Secretary U.S. GEOLOGICAL SURVEY Gordon P. Eaton, Director For sale by U.S. Geological Survey, Information Services Box 25286, Federal Center Denver, CO 80225 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 Library of Congress Cataloging-in-Publication Data Mineral resource potential and geology of Coronado National Forest, southeastern Arizona and southwestern New Mexico / edited by Edward A. du Bray, p. cm. (U.S. Geological Survey bulletin ; 2083-A-K) Includes bibliographical reference Supt. of Docs. no. : I 19.3:2083-A-K 1. Mines and mineral resources Coronado National Forest (Ariz. and N.M.) 2. Geology Coronado National Forest (Ariz. and N.M.) I. du Bray, E. A. II. Series. QE75.B9 no. 2083-A-K [TN24.A6] 557.3 s dc20 [553'.097915] 94-2417 CIP CONTENTS A. Summary and Introduction By Harald Drewes and Mark W. Bultman B. Geology of Coronado National Forest By Harald Drewes C. Geochemistry of Coronado National Forest By Gary A. Nowlan D. Aeromagnetic, Radiometric, and Gravity Data for Coronado National Forest By Mark E. Gettings E. Electrical Geophysical Surveys of Coronado National Forest By Douglas P. Klein F. Remote Sensing and Its Use in Identification of Altered Rocks in Coronado National Forest By Mark W. Bultman G. Mineral Resources, Ore Deposit Models, and Resource Potential of Coronado National Forest Locatable Minerals By Mark W. Bultman and Harald Drewes H. Mineral Resources and Resource Potential of Coronado National Forest Leasable Minerals By Harald Drewes I. Mineral Resources and Resource Potential of Coronado National Forest Salable Minerals By John Gutierrez, U.S. Forest Service J. Quantitative Mineral Resource Assessment of Coronado National Forest By Mark W. Bultman and Mark E. Gettings K. Recommendations for Future Earth Science Investigations in Coronado National Forest By Harald Drewes, Mark W. Bultman, Gary A. Nowlan, and Mark E. Gettings Appendix 1. Definition of Levels of Mineral Resource Potential and Certainty of Assessment Appendix 2. Geologic Time Chart III IV MINERAL RESOURCE POTENTIAL AND GEOLOGY, CORONADO NATIONAL FOREST, ARIZ. AND N. MEX. PLATES [Plates are in pocket. As shown on plates 2-4 and 6-32, the northern part of Coronado National Forest includes the Santa Catalina-Rincon, Santa Teresa, Galiuro, Winchester, and Pinaleno Forest units; the southeastern part includes the Dragoon, Peloncillo, and Chiricahua-Pedregosa Forest units; and the southwestern part includes the Santa Rita, Atascos-Cobre-Coches-Pajarito-San Luis-Tumacacori, Whetstone, and Patagonia-Huachuca-Canelo Forest units] 1. Maps showing key geologic features and geology-based mineral resource evaluation of Coronado National Forest Compiled by Harald Drewes 2-4. Geologic maps of the northern, southeastern, and southwestern parts of Coronado National Forest Compiled by Harald Drewes 2. Northern part 3. Southeastern part 4. Southwestern part 5. Maps showing geology, sample localities, and distribution of samples containing anomalous abundances of selected elements, Coronado National Forest Compiled by Gary A. Nowlan 6-8. Maps showing geochemical anomalies and distribution of stream-sediment and soil samples containing high and anomalous abundances of Au, Ag, As, Sb, Cu, Pb, Zn, and Mo in the northern, southeastern, and southwestern parts of Coronado National Forest Compiled by Gary A. Nowlan 6. Northern part 7. Southeastern part 8. Southwestern part 9-11. Complete Bouguer-gravity-anomaly maps of the northern, southeastern, and southwestern parts of Coronado National Forest Compiled by Mark E. Gettings 9. Northern part 10. Southeastern part 11. Southwestern part 12-14. Terrain-clearance maps for NURE profiles for the northern, southeastern, and southwestern parts of Coronado National Forest Compiled by Mark E. Gettings 12. Northern part 13. Southeastern part 14. Southwestern part CONTENTS V 15-17. NURE aeromagnetic-anomaly profiles for the northern, southeastern, and southwestern parts of Coronado National Forest Compiled by Mark E. Gettings 15. Northern part 16. Southeastern part 17. Southwestern part 18-20. NURE equivalent-uranium profiles for the northern, southeastern, and southwestern parts of Coronado National Forest Compiled by Mark E. Gettings 18. Northern part 19. Southeastern part 20. Southwestern part 21-23. NURE equivalent-thorium profiles for the northern, southeastern, and southwestern parts of Coronado National Forest Compiled by Mark E. Gettings 21. Northern part 22. Southeastern part 23. Southwestern part 24-26. NURE equivalent-potassium profiles for the northern, southeastern, and southwestern parts of Coronado National Forest Compiled by Mark E. Gettings 24. Northern part 25. Southeastern part 26. Southwestern part 27-29. Maps showing mineral resource assessment tracts in the northern, southeastern, and southwestern parts of Coronado National Forest Locatable deposits Compiled by Mark W. Bultman and Harald Drewes 27. Northern part 28. Southeastern part 29. Southwestern part 30-32. Maps showing mineral resource potential in the northern, southeastern, and southwestern parts of Coronado National Forest Locatable placer deposits, and leasable and salable commodities Compiled by Mark W. Bultman and Harald Drewes, U.S. Geological Survey, and John Gutierrez, U.S. Forest Service 30. Northern part 31. Southeastern part 32. Southwestern part Summary and Introduction By Harald Drewes and Mark W. Bultman MINERAL RESOURCE POTENTIAL AND GEOLOGY OF CORONADO NATIONAL FOREST, SOUTHEASTERN ARIZONA AND SOUTHWESTERN NEW MEXICO Edited by Edward A. du Bray U.S. GEOLOGICAL SURVEY BULLETIN 2083-A UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1996 CONTENTS Summary......................................................................................................................... 3 Introduction.................................................................................................................... 4 Character and geologic setting ......................................................................................