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Ore Deposits of the Jerome and Bradshaw Mountains Quadrangles, Arizona

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Ore Deposits of the Jerome and Bradshaw Mountains Quadrangles, Arizona DEPARTMENT OF THE INTERIOR Hubert Work, Secretary U. S. GEOLOGICAL SURVEY George Otis Smith, Director Bulletin 782 ORE DEPOSITS OF THE JEROME AND BRADSHAW MOUNTAINS QUADRANGLES, ARIZONA BY WALDEMAR LINDGREN WITH STATISTICAL NOTES BY V. C. HEIKES WASHINGTON GOVERNMENT PRINTING OFFICE 1926 CONTENTS Page Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1 History of mining - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -2 Production - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5 Mining districts near area here described - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6 General geology - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -7 Physiography - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -7 Paleozoic sediments - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 9 Pre-Paleozoic peneplain - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 10 Relation of the plateau province to the mountain region - - - - - - - - - - - - - - - - - - - - - 10 Post-Paleozoic erosion - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 13 Volcanic flows - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 13 Verde formation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 14 Latest formations - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 14 Pre-Cambrian rocks - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 14 - General features - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 14 Dike intrusions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -16 Bradshaw granite - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 16. Diorite and monzonite - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 17 Yavapai schist - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 17 Bradshaw Mountains quadrangle - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 17 Jerome quadrangle - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 19 Correlation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 20 Rocks of doubtful age - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 21 Granodiorite (quartz diorite) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 21 Basic dike rocks - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 22 Dikes of rhyolite porphyry - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 22 Ore deposits - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 24 Minerals of the ore deposits - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 24 General classification - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 31 Pre-Cambrian ore deposits - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -31 Pyritic copper deposits in schist - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -32 General character and form - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 32 Character of replacement - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 33 Origin of the replacement deposits - - - - - - - - - - - - - - - - - - - - - - - - - - - - 35 Magnetite deposits - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 35 Contact-metamorphic deposits - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 36 Gold-quartz-tourmaline replacement deposits - - - - - - - - - - - - - - - - - - - - - - - - 37 Gold quartz veins - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 37 General character - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 37 Production - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 38. Distribution - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 38 Strike, dip, and thickness - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 39 Mineralization - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 39 Unusual types of pre-Cambrian veins - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 39 Later gold and silver veins - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 41 General features - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 43 iii IV CONTENTS Ore deposits—Continued. Later gold and silver veins—Continued. Page Silver veins - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 43 Veins with barite - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 43 Veins mainly with quartz gangue - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 44 Gold and gold-silver veins - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 45 Proportion of gold to silver - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 45 Associated rocks - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 45 Mineralization - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 46 Distribution - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 46 Ore shoots - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 47 Unusual types - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 48 Water level and oxidation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 49 Chalcocite zones - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 50 Persistence in depth - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 51 Placer deposits - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 53 Detailed descriptions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 54 Verde district - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 54 Situation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 54 General geology - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 55 Pre-Cambrian rocks - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -56 Paleozoic sediments - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 58 Tertiary lavas - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 59 Tertiary lake beds - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 59 Ore deposits - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 60 United Verde mine - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 61 Location - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 61 History - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -61 Production - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 63 Development - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 64 Precipitation of copper - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 65 Smelting operations - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 66 Mine water - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 66 Geology - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 66 Metamorphosed sediments - - - - - - - - - -.
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