Mining Geophysics
2nd Edition
Published on 11. April 2014
416 pages
978-0-444-59623-9 (ISBN)
Description
Mining Geophysics
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D.S. Parasnis
Mining Geophysics
Book
05/1975
2nd Edition
Elsevier
€56.87
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Content
- Front Cover
- Mining Geophysics
- Copyright Page
- Table of 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
- Radioactivity
- Collection of preliminary information
- Trial surveys
- Staking an area
- Field measurements
- Geophysical maps
- Isoanomaly curves or contours
- Profile drawing
- Interpretation
- CHAPTER 3. MAGNETIC METHODS
- Introduction
- 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
- Magnetometers
- 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
- Introduction
- Origin of self-potentials
- Measurement of self-potentials
- Field procedure
- Examples of SP surveys
- CHAPTER 5. ELECTROMAGNETIC METHODS
- Introduction
- 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
- Afmag
- H-mode VLF
- Distortion of anomalies due to magnetic permeability
- CHAPTER 6. ELECTRICAL METHODS
- Introduction
- Resistivity
- Resistivity of rocks and minerals
- Apparatus
- 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
- Introduction
- 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
- Introduction
- Scope of the gravity method in ore prospecting
- Some difficulties
- Absolute and relative gravity measurements
- Gravimeters
- 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
- Introduction
- 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
- Introduction
- 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 METHODS
- Introduction
- Limitations of airborne surveys
- Magnetic airborne work
- Examples
- Interpretation of aeromagnetic maps
- Airborne electromagnetic methods
- Classification of airborne e.m. systems
- Fixed-separation systems
- Phase-measuring or quadrature systems
- INPUT
- 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
- Introduction
- 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 CROSS-SECTION
- REFERENCES
- INDEX
