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placer gold examination
PRINCIPALS AND PRACTICE
field guide book...to evaluate gold placer
properties & mining operations

Gold Placer Examination Book

Are you struggling under the recession? Go find Gold! This book will help you.
(Editors note: Order your book now and we are adding an "extra value" gift that will be of great value to your search for "the yellow stuff".)

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E-mail: placerexamination@goldminingclaims.net
or phone: Barry Murray 503-753-5868

We are providing you an opportunity to purchase this digitally re-mastered book placer examination, Principals and Practice “While prepared specifically for use by the Bureau of Land Management personnel” to evaluate gold placer mining operations, with the hope that it would be “useful to the mining profession.” Thank you John Wells for being a bureaucrat with a concern for what was right.

This very rare volume came from my Fathers’ mining attorney library. Wm B.Murray, an authority on patenting mining claims, had the crazy notion that the Mining Law of 1872 was a contract where citizens of the frontier could help build a strong nation. I too, back in 1955 during the Uranium rush to the Colorado Plateau, was proud to protect a free enterprise system in America from Communists.

As a prospector, who had, and lost, to new county tax regulations, placer gold claims in California, I know the rush is not over.

Therefore to justify charging for another man’s wisdom, I have added-50-years of margin notations to the re-mastering of what once was a $3 book, that can be downloaded through www.GoldMiningClaims.net for $9.95.

As I carried the little black book master in my pack for many years, I have improved the format. The easier to read enhanced type is also exportable to 3-hole 8.5 x 11 binder paper, where the “Check List” pages can be reprinted.

 

Contents of the Placer Examination, Principals and Practice Field Guide Book
(Editors note: Barry Murray has added footnotes from his experiences throughout this book)

CONTENTS

PART I - REVIEW OF PLACER THEORY AND GEOLOGY
1. Placers Defined
2. Study of Placers - General
3. Sources of Valuable Mineral
    a) Lodes or mineralized zones
    b) Erosion of pre-existing placer deposits
    c) Low-grade auriferous conglomerates or glacial debris
    d) Magmatic segregations and associated basic rocks
    e) Regional rocks containing particles of valuable mineral
4. Weathering and Release Processes
Placer Examination Book Cover     a) Ground water
    b) Temperature change
    c) Plant growth
    d) Surface erosion
5. Stream Processes Related to Placers
6. Concentration of Valuable Minerals
    a) Bedrock concentrations
    b) Types of bedrock
    c) Pay streaks
7. Preservation of the Deposit
    a) Abandonment
    b) Regional uplift
    c) Burial

PART II - TYPES OF PLACERS
1. Residual Placers
2. Eluvial Placers
3. Stream Placers
    a) Gulch placers
    b) Creek placers ,
    c) River deposits
    d) Gravel plain deposits
4. Bench Placers -
5. Flood Gold Deposits
6. Desert Placers
7. Tertiary Gravels
8. Miscellaneous Types -
    a) Beach placers ,
    b) Glacial deposits
    c) Eolian placers ,

PART III - SAMPLING AND EVALUATION
1. General Considerations
    a) Problems
    b) Industry practice
    c) Minerals other than gold i
    d) Other factors to be considered
    e) In brief
2. Sampling Guides
    a) Reconnaissance ,
    b) Choosing a sampling method
    c) Number and size of samples
3. Sampling Methods
    a) Existing exposures
    b) Hand-dug excavations
    c) Machine-dug shafts
    d) Backhoe excavators
    e) Bulldozer trenches
    f) Sampling with churn drills
    g) Bulk samples
    h) Grab samples
    i) Drift mine sampling
    j) Hydraulic mine sampling
4. Special Problems
    a) Large rock or boulders ,
    b) Erratic high values
5. Uncased or Small-diameter Drill Holes
6. Salting
7. When Sampling Fails

PART IV - SAMPLE WASHING EQUIPMENT (editors note: There are plans in this section of the book to build many of these pieces of gold mining equipment yourself.)
1. General Considerations
2. Miner's Pan
3. Sluice Box
4. Rockers
5. Special Machines
6. Dry Washers

PART V - PANNING AND ASSAY PROCEDURES
1. Panning
2. General Notes on Panning with Suggestions
For Improving Procedure
3. Fire Assay of Placer Samples - Misleading Results
4. Procedure For Determining Recoverable Gold in Placer Samples

PART VI - NOTES ON GENERAL PRACTICE
1. Description of Samples
2. Reduction of Sample Volumes
3. Reporting Values ,
4. Cost Estimates
5. New or Unproven Processes

PART VII - CHECK LIST FOR PLACER INVESTIGATIONS
1. General Considerations
2. Field Guide and Check List (example)

PART VIII - GLOSSARY OF PLACERS TERMS

APPENDIX
A. Placer Sampling Forms
B. Gold Price and Value Data
C. Water Data
D. Placer Drilling Data
E. General Information and Cost Data
F. Conversion Tables

 
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