Structural Geology in Drillcore

 

 

STRUCTURAL GEOLOGY AND ORE-FINDING IN DRILLCORE

SUMMARY PAPERS
INTRODUCTION
IDENTIFYING STRUCTURES IN DRILLCORE
Planar and linear structures
Concrete lineations
Folds
STRUCTURAL FERTILITY
Fertility of drillcore versus drillholes
How many structural readings do I need?
SCALAR PARAMETERS IN ORE FINDING
What are scalar parameters and why are they so valuable?
Ore deposit exploration models based on scalar parameters
STRUCTURAL ORIENTATIONS: TECHNIQUES
Information from non-oriented drillcore: vector patterns
Partial solutions
Internal solutions
External solutions
Drillhole dimensionality
Orientational stability
Reference structures
Reference structures in fold and greenstone belts
Lines and planes: special orientations
STRUCTURAL ORIENTATIONS: STRATEGIES
Visual
Core orienting kit
Drillcore reference frame and the stereonet
Lines and planes: stereonet constructions
Oriented drillcore
DRILLCORE MANAGEMENT
Coreyard layout
Drillcore handling
The error chain in drillcore
VERGENCE
FACING
FAULT ANALYSIS
STRUCTURAL TARGETING AND DRILLING DESIGN
Structural targeting versus spatial targeting
Learning curves of drilling and drllcore
Optimum sequencing of drillcore activities
Logging strategies
Drill path design via the stereonet
Inherent undersampling of a structure due to its drill path
Systematic failure to intersect drill target
Drilling strategies for shoots
MANIPULATION AND PRESENTATION OF RESULTS
Plotting structures on to a presentation plane (drill section)
New dip and plunge symbols for cross sections
SERIAL SECTION ANALYSIS
Vectorisation
Architectural templates in drill correlation
The natural cross section
NICHE ANALYSIS
Niche grade
Niche assaying: proactive and retrospective
OPTIMISING THE USE OF COMPUTERS
APPENDIX A:
STEREONET PRINCIPLES AND BASIC CONSTRUCTIONS
APPENDIX B: STEREONET EXPRESSION OF STRUCTURES
APPENDIX C: WORKED STEREONET EXERCISES
APPENDIX E: DOWNHOLE ORIENTATION TECHNOLOGY
REFERENCES