Mining Geophysics

Mining Geophysics

2nd Edition - January 1, 1973

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  • Author: D Parasnis
  • eBook ISBN: 9780444601858

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Mining Geophysics, Second Revised and Up-dated Edition serves as an introduction to the methods of ore mining and prospecting in the perspective of geophysics. The book explains the role of geophysics in ore prospecting; the collection and presentation of related data; and the location of ores through different methods such as the self-potential method, electromagnetic methods, induced polarized methods, seismic, and radioactive methods. The book also details the concepts and procedures behind said methods. The monograph is recommended for those in the mining industry who would like to know more about the methods of locating ores, as well as for geologists and geophysicists who aim to understand more and make studies about this phenomenon.

Table of Contents

  • Contents

    Preface to the First Edition

    Preface To the Second Edition

    Chapter 1. The Role of Geophysics in Ore Prospecting

    Chapter 2. General Aspects of the Collection and Presentation of Geophysical Data

    Classification of Geophysical Methods


    Collection of Preliminary Information

    Trial Surveys

    Staking An Area

    Field Measurements

    Geophysical Maps

    Isoanomaly Curves Or Contours

    Profile Drawing


    Chapter 3. Magnetic Methods


    Recalling Some Fundamental Concepts

    Induced and Permanent Magnetism

    General Magnetic Properties of Rocks

    Susceptibilities of Rocks

    Permanent Magnetization (Remanence) of Rocks

    Measurement of Susceptibility and Remanence

    The Geomagnetic Field


    Field Work

    The Zero Level

    An Orebody As A Magnet

    Interpretation of Magnetic Anomalies

    A Simple Example of A Magnetic Survey (U-Dal, Central Sweden)

    Magnetic Survey In the E-o Orefield (Central Sweden)

    Transverse Magnetization

    A Simple Geometrical Construction For Determining the Position Of An Ore Sheet

    Magnetic Effects of Broad Zones

    The Greenstone Area of Loos (Sweden)

    Vector Measurements

    Example of Vector Measurements

    Borehole Measurements

    Note On Reverse Magnetic Anomalies

    Chapter 4. the Self-Potential Method


    Origin of Self-Potentials

    Measurement of Self-Potentials

    Field Procedure

    Examples of Sp Surveys

    Chapter 5. Electromagnetic Methods


    Geometry of the Electromagnetic Field

    The Tilt-Angle Method

    Amplitude and Phase

    The Phase Angle and the Vector Diagram

    Real and Imaginary Components

    Measurement of the Real and Imaginary Components

    Classification of Electromagnetic Methods

    Fixed-Source Methods

    Loop Layouts

    Moving Source—Receiver Methods

    Examples of Moving Source—Receiver Surveys

    Use of Two Frequencies In Electromagnetic Prospecting

    Depth Penetration of Electromagnetic Methods



    Distortion of Anomalies Due To Magnetic Permeability

    Chapter 6. Electrical Methods



    Resistivity of Rocks and Minerals


    Commutation of Current

    Classification of Electric Methods

    Equipotential Method

    Earth-Resistivity Methods

    Apparent Resistivity

    Electrode Configurations In Resistivity Methods

    Electric Sounding

    Electric Mapping

    Mapping By Linear Current Electrodes (Theory)

    Field Examples of Line-Electrode Mapping

    The Mise-À-La-Masse Method

    Potential-Drop Ratio and A.C. Potential Methods

    Resistivity Measurements In Boreholes

    Chapter 7. Induced Polarization Methods


    Origin of Induced Polarization

    The Condenser Model

    Effect of Alternating Current

    Time-Domain and Frequency-Domain IP Methods

    Measures of the IP Effect

    Polarizability of Minerals and Rocks

    Examples of IP Surveys

    Interpretation of IP Results

    Concluding Remarks Concerning the IP Method

    Chapter 8. Gravity Methods


    Scope of the Gravity Method In Ore Prospecting

    Some Difficulties

    Absolute and Relative Gravity Measurements


    Field Procedure

    Corrections To Gravimeter Observations

    The Bouguer Anomaly

    Density Determination

    Interpretation of Gravity Anomalies

    Key Variables of Gravity Interpretation

    Gravity Profiles Across Simple Structures

    Regional and Local Gravity Anomalies

    Gravity Measurements On the Udden Sulphide Body (Sweden)

    Effect of Overburden On Gravity Anomalies

    Mass Estimates

    A Further Example of A Gravity Survey

    Underground and Shaft Measurements of Gravity

    Second Vertical Derivatives of Gravity Anomalies

    Chapter 9. Seismic Methods


    Types of Elastic Waves

    Scope of Seismic Measurements In Ore Prospecting

    Generation, Detection and Registration of Seismic Waves

    The Reflection Method

    The Refraction Method

    Illustrations of Seismic Measurements In Ore Prospecting

    Chapter 10. Radioactive Methods


    Scope of the Method

    Radioactive Decay and Radioactive Equilibrium

    Radioactivity of Rocks

    Instruments and Field Procedure

    Airborne Radioactive Prospecting

    Chapter 11. Airborne Magnetic and Electromagnetic



    Limitations of Airborne Surveys

    Magnetic Airborne Work


    Interpretation of Aeromagnetic Maps

    Airborne Electromagnetic Methods

    Classification of Airborne E.M. Systems

    Fixed-Separation Systems

    Phase-Measuring Or Quadrature Systems

    Input 3

    Passive Airborne E.M. Systems

    Depth-Penetration and Efficiency of Airborne E.M. Systems

    Interpretation of Airborne Electromagnetic Anomalies

    Example of An Airborne Survey

    Chapter 12. Combination of Geophysical Methods


    The Location of Geophysical Indications

    Examples of the Combination of Geophysical Methods

    Appendix 1. Simple Method of Determining the Magnetic Susceptibility and Remanence of Approximately Spherical Rock and Ore Samples

    Appendix 2. Magnetic Anomaly of Pole Systems

    Appendix 3. the Magnetic Field of A Large Rectangular Loop Carrying An Electric Current

    Appendix 4. Semi-Absolute Calculation of the Electromagnetic Field Components From Turam Reduced Ratios and Phase Differences

    Appendix 5. Electric Potential Due To A Point and A Line Current Electrode Placed On the Surface of A Homogeneous Ground

    Appendix 6. Method of Images

    Appendix 7. Gravity Anomalies

    Appendix 8. Depth Estimates of Some Simple Mass Shapes

    Appendix 9. Notes On the Master Curves In Fig. 117 For Total Field Magnetic Anomalies

    Appendix 10. Elliptic Polarization of the Electromagnetic Field

    Appendix 11. Fortran Source-Programs For Calculating the Vertical Field Magnetic Anomaly Due To An Inclined Prism and the Gravity Anomaly of A Two-Dimensional Feature of Arbitrary, Uniform




Product details

  • No. of pages: 414
  • Language: English
  • Copyright: © Elsevier 1973
  • Published: January 1, 1973
  • Imprint: Elsevier
  • eBook ISBN: 9780444601858

About the Author

D Parasnis

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