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Catalog Number

2011.1.12

Object Name

Book

Summary

Practical Field Geology including a guide to the sight recognition of one hundred and twenty common or important minerals by Alfred J. Moses, E. M. Ph D. Author: J. H. Farrell, E. M. PUBLISHER: McGraw- Hill Book Company, Inc. 239 West 39th St, NY
COPYRIGHT: 1912
CONTENTS
PREFACE.......................................................................v
CHAPTER I:PLANE TABLE AND STADIA SURVEYING .............................
Plane table outfit-Use of the plane table-The alidade-Theory
of stadia surveying-Stadia rod.
CHAPTER 1I.-TOPOGRAPHIC MAPPING........................................................ 10
What a base map should show-What a topographic map shows-
Best basis for a geologic map-Making a topographic map
Measuring the base line Correction of measurements-Triangulation
-Setting points, reading angles, calculation and solution of
triangles-Determination of elevations of triangulation points-
Plotting the triangulation system.
CHAPTER III.-TOPOGRAPHIC MAPPING (Continued).............................26
Transit vs. plane table for topographic mapping-Preparation of
working sheets-Choice of scale and contour interval-Field work
-Making the setup-Locating the point-Starting the map-Suggestions
as to methods of working-Field Outfit-Office work.
CHAPTER IV.-GEOLOGIC MAPPING..........................................................36
General surface mapping-What a geological map should show-
Base map-Working sheets-Methods Of field work and equipment
-Small plane table, geologist's compass-Strike and dip-
Sight alidade-Geological mapping in the field-Reconnoissance-
General geology, boundaries, when obscured by debris-Different
types illustrated-Work within areas of the same formatiOn-
Traversing-Points to be observed in working a sedimentary area
-Points to be observed in working an igneous formation, phases,
segregatiOns-Representing geological features on the map.
CHAPTER V.-GEOLOGIC MAPPING (Continued).................................... 51
Economic geology-Mapping faults-Mapping veins-Field notes
-Locations, sketches-Office work-Inking working maps-
Posting the field tracing-Final field map-Preparation and Labeling
of specimens-Underground mapping-Outfit, a good lamp,
candles, mine notebOok-Working maps, scale, etc.-Work of
underground mapping-RecOnnoissance-Starting the work-
Features tO be mapped.
CHAPTER VI.-GENERAL SUGGESTIONS FOR GEOLOGIC WORK . . 66
Tabulation of geological observations-Criteria of relative age-
Planning the field work-How to look for things in the field-
General impressions of boundaries-Altered
formations-Metamorphosed formations-General impressions of structure-Obscure
bedding planes-Variations in type within same rock mass-
Field classification of rocks-Qualifications for successful geological
work-How to think out geological problems-Limited working
hours.
CHAPTER VII.-THE INTERRUPTION OF GEOLOGICAL DATA . . . . 78
Surface and underground maps and notes must be compared and
correlated-Sections-Mine models-Assay plans-Studying general
sections, inferences to be drawn from them-Comparison of surface
and underground maps-Comparison of underground maps
from level to level-Comparison of geologic maps and sections
with assay plans-Checking theories by short field trips-Importance
of writing reports in the field-Further inference from
sections-Productive formations-Inference from mineral groups
-Recognition of conditions which may produce ore bodies-Conclusions
to be reached from facts regarding enrichment-Reasons
for ore sheets-Concerning recommendations-Geologist must not
be too theoretical-Negative recommendations-Field covered by
recommendations-Recommendations should be based upon mode
of occurrence of the ore bodies.
CHAPTER VIII.-GEOLOGICAL MEASUREMENTS....................................... 94
Measurements from surface map-Effect of topography upon outcrop
-Faulting-Definitions-Diagrams of fault measurements.
CHAPTER IX.-APPLICATION OF DESCRIPTIVE GEOMETRY TO MINING
PROBLEMS. BY JOSEPH W. ROE ............................................................103
Introduction-Problems-To find the strike of a vein-To find the
dip-To find the depth of a shaft-Length of a tunnel-Location
of a tunnel-To find the bearing of a shoot -To find the thickness
of a vein-To find the limits of an ore dump-Ore dump on a property
line-Location of a ridge for maximum capacity-To plot the
outcrop of a vein-To determine the outcrop of a folded seam.
CHAPTER X.-APPLICATION OF GEOLOGICAL THEORY............................127
Theory of ore deposition-Introductory-Two kinds of natural
processes-Association of ore deposits with igneous rocks-Sources
of the metals-Origin of transporting solutions-Magma defined-
Magmatic differentiation-End phases-Transition from dike to
vein-Vein stages or zones-Surface waters theory-Examples of
application of foregoing theories.
CHAPTER XI.-APPLICATION OF GEOLOGICAL THEORY (Continued) . 139
Secondary enrichment-Theory outlined-Definitions-Controlling
factor-Influence of structures-Solvent action of descending
waters-Solubility of the metals-Depth of the zone of secondary
enrichment-Criteria for the recognition of the oxidized zone-
Criteria for the recognition of the zone of secondary enrichment-
Possible cases-Contact metamorphism-Definition-Discussion
-Description of limestone-Igneous contact zone-Division into
stages of mineral deposition-Rock texture-Descriptions-
Deductions.
CHAPTER XII.-RocK CLASSIFICATION.............................................. 150
Definition-Igneous rocks-Means of classification-Texture-
Rock forming minerals-Naming rocks in the field-Rock names
not included in the table-Field names for doubtful specimens-
Clastic rocks-General classes-Sedimentary rocks-Tabulation of
types-Metamorphic rocks-Agencies of metamorphism-Types-
Gneiss-Schist-Quartzite-Slate-Limestone, etc.-Use of the
microscope suggested-Table for the examination of rocks.
CHAPTER XIII.-GEOLOGICAL PROSPECTING.......................................162
Outfit-General hints-Pack straps-Pack saddles-Extra supplies
for repair en route-Concerning shoes, clothing, bedding,
medicine case, etc.-Maps-Instruments-Triangulation-Plane
table location-Sampling and assaying-General remarks-A
portable assay outfit.
CHAPTER XIV.-GEOLOGICAL PROSPECTING (Continued) .................... 180
Generalities-Float-Color of outcrop-Inference to be drawn from
nature of vein and country rock.
CHAPTER XV.-PROSPECTING DY DRILLING....................................... 187
Diamond drill-Churn drill-Drilling as a method of prospecting-
The geologist's work-Report forms-Final records.
APPENDIX.............................................................................................195
Definitions-Lists of outfits-Measurement of gold and silver beads
by means of microscope.
SUPPLEMENT.-GUIDE TO THE " SIGHT RECOGNITION " OF ONE
HUNDRED AND TWENTY COMMON OR IMPORTANT MINERALS. BY
A. J. MOSES 207
INDEX TO MINERALS

Author

Alfred J. Moses, E. M. Ph D.

Title

Practical Field Geology including a guide to the sight recognition of one hundred and twenty common or important minerals

Published Date

1912

Cataloged by

Graham, Tom