Geology and Ore Deposits of the Upper Blue River Area Summit County Colorado

Geological Survey Bulletin 970

1951

Quentin D Singewald

Contents:

• Abstract
• Introduction
• Unconsolidated deposits
• Bedrock
• • Pre-Cambrian rocks
  • • Idaho Springs formation
    • Granite
    • Pegmatite
  • Pre-Pennsylvanian sedimentary rocks
  • Pennsylvanian and Permian sedimentary rocks
  • • Southwest of Boreas Pass fault
    • Northeast of Boreas Pass fault
  • Mesozoie sedimentary rocks
  • Late Cretaceous or early Tertiary igneous rocks
  • • Form and classification
    • Monzoni te porphyry
    • Quartz monzonite porphyry
    • Lincoln porphyry
    • Granodiorite
    • White porphyry
    • Contact metamorphism
• Structure
• • Pre-Cambrian structure
  • Laramide structure
  • • General features
    • Structure of Hoosier Pass area
    • Boreas Pass fault and associated transverse faults
    • Major faults north of Breckcnridge
    • Transverse belt of major faults
    • Minor faults
    • Theoretical analysis
• Ore deposits
• • Output and history
  • Geographic distribution.
  • • Western mineralized area
    • • Structural control
      • Zonal pattern
      • Megascopic mineralogy of ores
      • Form and stratigraphie relations of ores
    • Eastern mineralized area.
    • • Structural control
      • Megascopic mineralogy and zonal pattern
      • Form and stratigraphie relations of ores
  • Suggestions for prospecting
  • • General areas
    • Western mineralized area
    • Eastern mineralized area
• Mine descriptions
• • Monte Cristo Gulch
  • • Ling mine
    • Arctic mine
    • Senator mine
    • Vanderbilt mine
    • El Dorado mine
    • Monte Cristo mine
    • Bemrose mine
    • Adit located three-quarters of a mile north-northeast of Hoosier Pass
  • McCullough, Spruce, and Carter Gulches
  • • Briar Rose mine
    • Solitary and Big Bonanza mines
    • Last Dollar mine
    • Diamond Jack mine
    • Little Fool property
    • Governor mine
  • East side of Blue River Valley
  • • Fredonia mine
    • • Location, output, and character of ore
      • Geologic setting
      • Rocks cut by mine workings
      • Geologic structure
      • Ore bodies
    • Derilla and Hunter Boy workings
  • Indiana Gulch
  • • Warrior's Mark mine
    • Seven-Thirty mine
    • Twin Sisters mine
    • Mountain Pride mine
  • Shock Hill
  • • Iron Mask mine
    • Brooks-Snider mine
• Literature cited
• Index

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