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Structural methodsin explorationCollection of orientation data
Analysis methodsStructural orientation dataStructural patterns map, x-sectionFault-vein longitudinal sectionsDrill targeting - ore zones, ore shoots
Collection of orientation data bedding/contact strike/dip fault strike/dip slickenline rake shear sense vein strike/dip fold fold axis fold axial plane (cleavage) fold asymmetry, vergence dike strike/dip flow foliation shear sense
Collection of orientation dataBasement structure important: test for structural controls Volcanic structuresFlow layering test for flow dome geometry, concentric/radialBedding/volc. layering test for block rotations, inference of listric normal faults, intrusive centersDikes test for intrusive center, extension directionFault and fault-vein dataStrike/dip, slickenline rake, shear sense, fill paragenesis test for kinematic control on ore shoot
Analysis of structural dataSlickenline histogram test for dominant structural regime
Quellopata
Statistical analysis determine average orientation of fabric elements or setsIdaho Springs district, Colorado
Statistical analysis determine average orientation of fabric elements or setsIdaho Springs district, Coloradofoliationveins
Paleo-stress modeling determine extension directionM-plane analysisFaultkin analysis
M-plane analysisT-fractures = most favorable opening = s1 s2 plane
Ejemplo de anlisis cinemtica, Veta Baja, Arcata mine, Peru
EjercicioPaleo-stress modelingVeta Baja data: MHC geos: M-plane method Compile all data (Nelson Faultkin)Tres Reyes dataVeta Baja dataCompile:
Structural pattern recognitionMap and cross section patterns but 3-DPatterns:ConjugateOrthorhombicEn echelonjog, bend (cymoid loop)
en echelon, jog, bend
Cerro Blanco, Chile
Intersection model
Fault-vein longitudinal sectionsProject x, y, z mine data to longitudinal sectionContour:Ore gradeVein thicknessStrikeDipMetal ratios, geochemistry
Long Sections
Dip - Grade
Strike - GradeN
Drill targeting - Designore zones, ore shoots
Other Models
Ore shoot = cutoff lineSlickenlines ^ ore shoot 90Ore shoot = fault Riedel intersection
Ore shoot = cutoff line
Slickenlines ^ ore shoot 90
Ore shoot = fault Riedel intersectionOblique slip
EjercicioDrill hole designVeta Baja data: slickenline model
Veta Tres Reyes data: fault jog model(need data from all MHC geos)
WHAT ARE THE EQUATIONS ??