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GEOPHYSICAL EXPLORATION METHODS
CASE HISTORIES IN MINING GEOPHYSICS
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aeromagnetic aeromagnetic survey asbestos bands bedrock Boliden Boston township Canada cent conductive conductors contours copper costean curves deposits depth detail diabase diamond drilling dip needle drill holes dykes earth electrical electrode electromagnetic electromagnetic survey exploration fault formation frequency gabbro gammas geochemical Geol geological mapping geologist geophones geophysical methods Geophysical Prospecting geophysicist granite graphitic gravity gravity anomalies greywacke ground magnetometer horizontal in-phase indicated interpretation intervals intrusive iron-formation Lake layer lines located magnetic anomalies magnetic data magnetic field magnetic surveys magnetite magnetometer magnetometer survey massive sulphide measurements meter-ohms miles milligals Mining observed obtained orebodies out-of-phase outcrops overburden peridotite potentials Precambrian present profiles pyrite pyrrhotite receiving coil reconnaissance resistivity rhyolite Ridge rocks samples schist sediments self-potential shear zones shown in Figure shows soil spontaneous polarization sulphide sulphide body surface techniques thickness tion township Trans transmitting coil traverse values variations veins vertical volcanic