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B2064-W Front The Geology and Mineral Deposits of Part of the Western Half of the Hailey 1°×2° Quadrangle, Idaho By Earl H. Bennett with a section on The Neal Mining District By Thor H. Kiilsgaard and Earl H. Bennett and a section on The Dixie Mining District By Thomas M. Jacob U.S. Geological Survey Bulletin 2064-W Prepared in cooperation with the Idaho Geological Survey, Idaho State University, and the University of Idaho U.S. Department of the Interior U.S. Geological Survey U.S. Department of the Interior Gale A. Norton, Secretary U.S. Geological Survey Charles G. Groat, Director This publication is only available online at: http://geology.cr.usgs.gov/pub/bulletins/b2064-w/ Version 1.0 2001 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 Published in the Central Region, Denver, Colorado Manuscript approved for publication April 20, 2001 Graphics by authors Photocomposition by Gayle M. Dumonceaux Contents Abstract ......................................................................................................................................... 1 Introduction ................................................................................................................................... 1 Geology .......................................................................................................................................... 1 Major Rock Units ............................................................................................................... 1 Metamorphic Rocks................................................................................................. 1 Rocks of the Idaho Batholith .................................................................................. 3 Tertiary Intrusive Rocks .......................................................................................... 3 Dike Swarms ..................................................................................................... 4 Challis Volcanic Group ............................................................................................ 7 Idavada Volcanics.................................................................................................... 7 Lacustrine Deposits ................................................................................................. 8 Basalts and Gravel Deposits .................................................................................. 9 Alluvial Deposits ....................................................................................................... 12 Structure ............................................................................................................................. 12 Cretaceous Tertiary(?) Compression and Extension(?)...................................... 13 House Mountain Decollement........................................................................ 13 Chimney Peak.................................................................................................... 13 Old Pine-Dixie Gulch Hot Springs Road Orthogneiss................................. 15 Cow Creek Fault................................................................................................ 15 Mylonite near Hall Gulch................................................................................. 15 Thrusting and the Batholith .................................................................................... 17 Eocene Extension ..................................................................................................... 17 Eocene and Older, Normal Northeast-Trending Faults ............................. 17 Regional Northeast Structures and Trends................................................. 17 Brittle Deformation........................................................................................... 19 Basin and Range Extension .................................................................................... 19 North-Trending Faults...................................................................................... 20 Geologic Summary ............................................................................................................ 22 Mineral Deposits .......................................................................................................................... 22 Periods of Mineralization ................................................................................................. 22 Late Cretaceous-Paleocene Deposits .................................................................. 22 Eocene Deposits....................................................................................................... 23 Possible Miocene and Younger Deposits ........................................................... 24 Neal Mining District by Thor H. Kiilsgaard and Earl H. Bennett ............................... 24 Production ................................................................................................................. 24 History ........................................................................................................................ 24 Homestake, Hidden Treasure, and Daisy Mines......................................... 26 Golden Eagle Mine........................................................................................... 26 Other Properties ............................................................................................... 26 Geologic Setting ....................................................................................................... 26 Principal Veins .......................................................................................................... 27 Other Veins ................................................................................................................ 27 Comparison of Veins of the Neal Mining District With Those of the Quartzburg and Yuba Mining Districts.................................................................. 28 Mineral Exploration of the Neal Mining District in the 1980’s........................... 28 III Daisy-Homestake-Mountaineer Area........................................................... 28 Golden Eagle Mine ........................................................................................... 28 Confidence Mine............................................................................................... 28 Sunshine Mine .................................................................................................. 29 Blacks Creek Prospect .................................................................................... 29 Pine (Pine Grove) Mining District.................................................................................... 29 Franklin Mine............................................................................................................. 29 Mountain View (Bonnie Anna) Mine ..................................................................... 30 Skeleton Creek Mining District........................................................................................ 30 Featherville Mining District .............................................................................................. 31 Rocky Bar Area (Rocky Bar, Spanish Town, Bear River, and Red Warrior Districts......................................................................................................... 31 Production.................................................................................................................. 31 Geologic Setting........................................................................................................ 32 History.........................................................................................................................32 Marsh Creek Mine.................................................................................................... 32 Prospects North of the Bonaparte Mine .............................................................. 32 Ophir Mine ................................................................................................................. 32 Other Occurrences in the Rocky Bar Area........................................................... 32 Lime Creek Mining District ............................................................................................... 32 Volcano Mining District .................................................................................................... 33 Dixie Mining District by Thomas M. Jacob.................................................................... 33 Geologic Setting........................................................................................................ 33 History and Production ............................................................................................ 33 Other Mines In or Near the Dixie Mining District................................................ 37 Roaring River Mining District........................................................................................... 37 Other Mines in the Study Area ........................................................................................ 37 References..................................................................................................................................... 37 Figures 1. Location map of the western half of the Hailey 1°×2° quadrangle, Idaho.......... 2 2. Generalized geologic map
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