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Author: Admin | 2025-04-28
Mineral Exploration and Mining! - PowerPoint PPT Presentation Description: Define placer deposit, and explain. how placer deposits form. Placer deposits are minerals concentrated by wind and water into surface locations ... – PowerPoint PPT presentation Number of Views:595Avg rating:3.0/5.0 lessTranscript and Presenter's NotesTitle: Mineral Exploration and Mining! 1IT'SLECTURETIME 2Chapter 16Mining and Mineral Resources 3B. Describe the different types of mining and associated processesB1. Describe the manner in which mining companies explore for new mineral depositsa. First step Find an ore deposit! Companies use instruments that measure gravity, magnetism, and radioactivity and pictures from satellites and planes Next Take samples Determine how much ore is present d. Open a mine ??A mineral deposit must have 100 to 1000 times the concentration of the mineral than ordinary rocks do to be feasible to mine! 4B2. Describe three methods of subsurface mining1. Room-and-pillar mining. Gigantic areas are excavated and small areas remain untouched to hold up the ceiling 52. Longwall MiningIn this type of mining, a machine moves along the face of rock and shears off the stone onto a conveyer Hydraulic arms hold up the ceiling until the machine moves forward then the ceiling collapses 63. Solution MiningHot water is used to dissolve the ores and bubbles lift it to the surface 7B3. Describe three methods of surface mining1. Open-pit mining This mining occurs when the ore is near the surface and layers of rock covering it, called overburden, can be stripped away by machines 82. QuarryingMethod of cutting larger sections of
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