Geology and Ore Deposits of the Creede District, Colorado.

USGS Bulletin 718, 220 pages 1923

Chapter I. Introduction

• Location and topography
• Tield work and acknowledgments
• History
• Mining and treatment of ores
• General conditions
• • Humphreys mill
  • Amethyst mill
  • Solomon mill
  • Ridge mill
• Production
• Bibliography
• Chapter II. Outline of the geology
• • Age of the rocks
  • Potosi volcanic series
  • Alboroto group
  • Piedra group
  • Creede formation
  • Fisher quartz latite
  • Intrusive rocks
  • Quaternary deposits
  • Geologic structure
• III. Rocks of the Alboroto group
• • General features
  • Outlet Tunnel quartz latite
  • General character and occurrence
  • Petrography
  • Weathering and outcrops
  • Willow Creek rhyolite
  • General character and distribution
  • Petrography
  • Chemical composition
  • Structure
  • Weathering and alteration
  • Topography and scenery
  • Oampbell Mountain rhyolite
  • General character and distribution
  • Contacts
  • Petrography
  • Weathering and outcrops
  • Distinction from other rhyolites
  • Phoenix Park quartz latite
  • General character and distribution
  • Petrography
  • Outcrops and weathering.
  • Equity quartz latite
  • General character and occurrence
  • Contacts
  • Petrography
  • Weathering and outcrops
• Chapter IV. Rocks of the Piedra group
• • General features
  • Hornblende-quartz latite
  • General character and distribution
  • Thickness
  • Petrography
  • Weathering and outcrops
  • Windy Gulch rhyolite breccia
  • General character and distribution
  • Petrography
  • Weathering and outcrops
  • Comparison with Campbell Mountain rhyolite
  • Mammoth Mountain rhyolite
  • General character and distribution
  • Character of contacts and thickness
  • Petrography
  • Weathering and outcrops
  • Comparison with Campbell Mountain rhyolite
  • Rhyolite tuff
  • General character and distribution
  • Petrography
  • Tridymite latite
  • General character and occurrence
  • Thickness
  • Petrography
  • Tridymite, quartz, and cristobalite in volcanic rocks
  • Chemical composition
  • Flow near mouth of Deerhorn Creek
  • Outcrops, weathering, and alteration
  • Andesite
  • General character and distribution.
  • Petrography
  • Alteration and topography
  • Quartz latite tuff
  • General character and occurrence
  • Thickness
  • Petrography
  • Massive rock in the tuff
  • Weathering and outcrops
  • Rat Creek quartz latite
  • General character and distribution
  • Thickness
  • Petrography
  • Weathering, outcrops, and topography
  • Nelson Mountain quartz latite
  • General character and distribution
  • Thickness
  • Petrography
  • Weathering and outcrops
• Chapter V. Creede formation
• • Name, general character, and occurrence
  • Structure and thickness
  • Subdivisions
  • Lower member
  • General character
  • Petrography
  • Interbedded travertine
  • Character and distribution.
  • Origin
  • Upper member
  • General character and distribution
  • Petrography
  • Massive rocks
  • Weathering and topography
  • Origin
  • Position in the section
  • Age
• Chapter VI. Fisher quartz latite
• • General relations
  • General character and distribution
  • Thickness
  • Petrography
  • Weathering and outcrops
• Chapter VII. Intrusive rocks
• • Types
  • Rhyolite porphyry
  • General character and distribution
  • Relation to adjoining rocks
  • Petrography
  • Quartz latite porphyry
  • Occurrence
  • Age
  • Petrography
  • Intrusive basalt
  • Occurrence
  • Petrography
  • Hornblende-quartz latite porphyry
• Chapter VIII. Quaternary deposits
• • Significance
  • Moraines
  • Distribution
  • Glacial topography
  • Two stages of glaciation
  • Earlier moraines
  • Later moraines
  • Character of material
  • Postglacial erosion
  • Economic considerations
  • Terrace gravels
  • Landslides
  • General features
  • Distribution
  • Economic considerations
  • Talus
  • Alluvial fans
  • Alluvium
• Chapter IX. Structure
• • Faulting
  • Difficulties in detecting faults
  • General character of faulting
  • Age
  • Mineralization along faults
  • Amethyst fault system
  • Equity fault
  • Fault block of Mammoth Mountain
  • Bulldog Mountain fault
  • Solomou-Ridge fault
  • Alpha fault
  • Structure northeast of Sunnyside
  • Minor faults
• Chapter X. Ore deposits
• • General character
  • Minerals of the deposits
  • Quartz
  • Barite
  • Thuringite
  • Adularia
  • Rhodochrosite
  • Fluorite
  • Galena
  • Pyrite
  • Sphalerite
  • Chalcopyrite
  • Gold
  • Native silver
  • Argentite
  • Stephanite
  • Marcasite
  • Anglesite
  • Cerusite
  • Limonite
  • Jarosite
  • Calcite
  • Siderite
  • Malachite
  • Chryaocolla
  • Kaolin
  • Cerargyrite
  • Chrysoprase
  • Chalcedony
  • Wad
  • Goelarite
  • Gypsum.
  • Chalcanthite
  • Melanterite
  • Smithsonite
  • Pyromorphite
  • Hematite
• The fractures
• General character
• Nature of fault movements
• Character of the ores
• Composition and metals contained
• Structure and paragenesis of the primary ores
• Hydrothermal metamorphiam
• Character of solutions that deposited the primary ores
• Age and genesis of the deposits
• Superficial alteration of ores
• Downward enrichment
• General character
• Fractured condition of the lodes
• Mine waters
• Composition of altered ores
• Secondary precipitation of silver and gold
• Extent of Amethyst vein before erosion
• Gases in Amethyst lode
• Exploration of district
• Extensions on strike of developed deposits
• Fractures and veins in walls of developed deposits
• Extensions in depth
• Prospecting for new lodes
• Chapter XI. Mines
• • Bachelor mine
  • Copper lode
  • Commodore mine
  • Last Chance, New York, and Del Monte mines
  • Amethyst mine
  • Happy Thought mine
  • White Star mine
  • Park Regent mine
  • Captive Inca mine
  • Dolgooth claim
  • Equity mine
  • Exchequer tunnel
  • Jo Jo tunnel
  • Mammoth mine
  • Oxide claims
  • Pipe Dream claim
  • Mustang vein
  • Overholtlode
  • Rio Grande No.2 lode
  • Jack Pot lode
  • Solomon and Holy Moses mines
  • Ridge mine
  • Phoenix mine
  • Outlet tunnel and Ada group of claims
  • Carbonate vein
  • Mollie S. mine
  • Eunice mine
  • Dora Belle tunnels
  • Homestake claim
  • Mammoth tunnel
  • Barney tunnel
  • Monte Carlo mine
  • Conejos No. 2 chum
  • Cleaveland tunnel
  • Tahrahathea claim
  • Bulldog, Kansas City Star, and North Star claims
  • Bethel claim
  • Little Gold Dust claim
  • Alpha and Corsair mines
  • Reno prospect
  • Kreutzer Sonata mine
  • Diamond King claim and Paris tunnel
  • Monon mine
  • Sunnyside tunnel
  • Delaware claim
• Index

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