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Oregon Availability of Books and Maps of the U.S OREGON 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 of 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 Books OVER THE COUNTER Books 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, 1 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.. mertts.) • ANCHORAGE, Alaska--Rm. 101, 4230 University Dr. • ANCHORAGE, Alaska--Federal Bldg, Rm. E-146, 701 C St. MapsI 1 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. AlatSka 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. ERRATA SHEET Bulletin 1741-G Mineral Resources of the Blue Canyon and Owyhee Breaks Wilderness Study Area, Malheur County, Oregon A line of text is missing from the bottom right column of page G9: ... extension of the DeLamar-Duck Valley structural trend and ... Chapter G Mineral Resources of the Blue Canyon and Owyhee Breaks Wilderness Study Areas, Malheur County, Oregon By DEAN B. VANDER MEULEN, VINCENT E. BARLOCK, PATRICK S. PLUMLEY, JAMES G. FRISKEN, and ANDREW GRISCOM U.S. Geological Survey j. DOUGLAS CAUSEY U.S. Bureau of Mines U.S. GEOLOGICAL SURVEY BULLETIN 1741 MINERAL RESOURCES OF WILDERNESS STUDY AREAS: EAST-CENTRAL OREGON U.S. 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 : 1990 For sale by the f 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 Blue Canyon and Owyhee Breaks wilderness study areas, Malheur County, Oregon I by Dean B. Vander Meulen ... [et al.] p. em. - (Mineral resources of wilderness study areas-east- central Oregon; ch. G) (U.S. Geological Survey bulletin; 1741-G) Includes bibliographical references. Supt. of Docs. no.: I 19.3:1741-G 1. Mines and mineral resources-Oregon-Blue Canyon Wilderness. 2. Mines and mineral resources-Oregon-Owyhee Breaks Wilderness. 3. Blue Canyon Wilderness (Or.) 4. Owyhee Breaks Wilderness (Or.) I. Vander Meulen, Dean B. II. Series. Ill. Series: U.S. Geological Survey bulletin : 1741-G. QE75.B9 no. 1741-G 557.3 s-dc20 90-3902 [TN24.07] [553 1.09795 197] 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 repon presents the results of a mineral survey of the Blue Canyon (OR-003-073) and Owyhee Breaks (OR-003-059) Wilderness Study Areas Malheur County, Oregon. CONTENTS Summary G1 Abstract G1 Character and setting G 1 Identified resources G3 Mineral resource potential of the Blue Canyon Wilderness Study Area G3 Mineral resource potential of the Owyhee Breaks Wilderness Study Area G4 Introduction G4 Area description G4 Previous and present investigations GS Appraisal of identified resources GS History and production GS Mines, prospects, claims, and mineralized areas G8 Acknowledgments G8 Identified resources of the Blue Canyon Wilderness Study Area G8 Identified resources of the Owyhee Breaks Wilderness Study Area G8 Assessment of mineral resource potential G9 Geology G9 Caldera and structural evolution G9 Volcanic stratigraphy G 10 Sedimentary stratigraphy G11 Geochemical studies G 12 Regional gold mines and prospects G16 Results and interpretation G 17 Geophysical studies G 18 Aeromagnetic survey G 18 Gravity and gamma ray surveys G 18 Mineral and energy resource potential of the Blue Canyon Wilderness Study Area G19 Mineral and energy resource potential of the Owyhee Breaks Wilderness Study Area G20 References cited G21 Appendixes G25 Definition of levels of mineral resource potential and certainty of assessment G26 Resource/reserve classification G27 Geologic time chart G 28 FIGURES 1. Index map showing location of Blue Canyon and Owyhee Breaks Wilderness Study Areas, Malheur County, Oregon G2 2. Map showing mineral resource potential and generalized geology of Blue Canyon and Owyhee Breaks Wilderness Study Areas, Malheur County, Oregon G14 3. Bouguer gravity anomaly map of part· of the Lake Owyhee volcanic field, eastern Oregon G 19 Contents V TABLES 1. Mines, prospects and mineralized areas in the Blue Canyon and Owyhee Breaks Wilderness Study Areas, Malheur County, Oregon G6 2. Geochemical summary for 46 nonmagnetic panned-concentrate samples from the Blue Canyon and Owyhee Breaks Wilderness Study Areas and adjacent areas, Oregon G13 3. Geochemical summary for 47 minus-80-mesh stream-sediment samples from the Blue Canyon and Owyhee Breaks Wilderness Study Areas and adjacent areas, Oregon G13 4. Geochemical summary for 82 rock samples from the Blue Canyon and Owyhee Breaks Wilderness Study Areas and adjacent areas, Oregon Gl3 VI Contents Mineral Resources of the Blue Canyon and Owyhee Breaks Wilderness Study Areas, Malheur County, Oregon By Dean B. Vander Meulen, Vincent E. Barlock, Patrick S. Plumley, James G. Frisken, and Andrew Griscom .u.s. Geological Survey J. Douglas Causey U.S. Bureau of Mines SUMMARY Abstract At the request of the U.S. Bureau of land Management, hot-spring deposits. The rest of the study area has moderate the U.S. Geological Survey and the U.S. Bureau of Mines mineral resource potential for gold in volcanic- and sediment­ conducted field studies of 1 2',700 acres and 13,1 00 acres, hosted deposits. Tuffs associated with the Mahogany Mountain respectively, in the contiguous Blue Canyon (OR-003-073) caldera have low potential for zinc resources. These tuffs are and Owyhee Breaks (OR-003-059) Wilderness Study Areas; exposed locally throughout the study area. North-trending the areas are adjacent to and include part of the Owyhee fault zones within and adjacent to the study area have moder­ River in eastern Oregon. In this report, the a.reas studied for ate potential for geothermal energy resources. Sedimentary mineral resources are referred to, individually or collectively, rocks that underlie the northern and western parts of both as the 11Wilderness study area" or simply the "study area." study areas have moderate mineral resource potential for ben­ Fieldwork was conducted by the U.S. Geological Survey during tonite and diatomite, low mineral resource potential for fluorite, 1985 and 1988 and by the U.S. Bureau of Mines during 1988 and low potential for oil and gas energy resources. to appraise the identified mineral resources (known) and assess the mineral resource potential (undiscovered) of the study area. Character and Setting The southern part of the Blue Canyon Wilderness Study Area contains identified resources of jasper and perlite and The Blue Canyon (OR~3-073) and Owyhee Breaks occurrences of bentonite.
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