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Ore Deposits -- Origin and Processes Host; Dr. David Pearson. Ore Deposits - Lesson 21 - Part 1 of 6 •Ore definition •Finding ore deposits •Instruments of early prospectors •Igneous intrusions •Concentrations of ore •Crystallization of magmas •How are veins produced Ore Deposits - Lesson 21 - Part 2 of 6 •Crystallization of magmas •How are veins produced •Secondary intrusions -- effects of the surrounding rock •Yellowknife Giant Mine •Refined, pouring gold bricks •Yellowknife gold deposit -- vein type •Young Sulphides deposit occur in subduction zones Ore Deposits - Lesson 21 - Part 3 of 6 Host; Dr David Pearson •Ancient subduction zone, ie. Andes mountains •Andes Mountains mineral ore deposit •Geological exploration in Canada early 70's •Geophysical equipment to detect ore deposits in the 70's •Magnetic equipment •Radiometric equipment •Resistivity equipment (resistance to passage of electrical current of the rocks/ore in a body beneath the surface) Ore Deposits - Lesson 21 - Part 4 of 6 Host Dr. David Pearson •Resistivity equipment •Magnetometer •Measuring tilt of magnetic field •Seismograph •Portable drills •Downhole cameras Ore Deposits - Lesson 21 - Part 5 of 6 Dr. David Pearson •Downhole cameras •Interpretation of images from downhole camera •Core logging •Concentration of ores and separation Ore Deposits - Lesson 21 - Part 6 of 6 •Concentration of ores and separation