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Mining Books

Tertiary Gold Bearing Channel Gravel California Mining


Tertiary Gold Bearing Channel Gravel California Mining


Product Description

Rare Publications on Ebook

Tertiary Gold-Bearing Channel Gravel in Northern Nevada County, California

Geological Survey Circular 566 - 1968

Here is a great study done by the USGS on the Motherlode! Complete with Maps and Diagrams!

Contents Include:

  • Abstract
  • Geology of the Channel Gravel
  • Introduction
    • Previous work
    • Acknowledgments
  • General Geology
    • Bedrock
    • Auriferous Gravel
    • Volcanic Rocks
    • Colluvium
  • Tertiary Channel Near North Columbia
    • Configuration of the Channel
    • Grade and Distribution of gold
  • Geophysical Investions of the channel gravel
    • Introduction
    • Acknowledgements
  • Instrumentation and Field Procedures
  • Determination of Bedrock Configuration
    • Seismic Method
    • Gravity Method
    • Magnetic Method
    • Resistivity Method
    • Electromagnetic Method
    • Induced - Polarization Method
  • Detection of Tertiary channels under volcanic cover
  • Recognition and delineation of the blue gravel
  • Location of concentrations of magnetic minerals
  • Conclusions
  • References Cited


  • Index Map showing loation of area studied
  • Geologic map of part of area between the South and Middle Yuba Rivers
  • Diagram showing inferred path followed by the Tertiary Yuba River
  • Diagrammatic section across and idealized Tertiary channel
  • Detailed Geologic map showing location of hydraulic pits and drill holes in the Tertiary gravel in the vicinity ofn North Columbia and Badger Hill
  • Subsurface Contour map of bottom of channel near North Columbia as indicated by drill holes
  • Cross Section o channel near North Columbia as indicated by one line of drill holes
  • Contour map of the foot-assay product as indicated by drilling information

* This document was digitally archived by Sylvanite, Inc. and is not to be used for resale or reproduction. You are not purchasing the original document but a PDF format available for instant download upon purchase.


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