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  • Mining - Placer mining | Britannica

    Mining - Placer mining: Placers are unconsolidated deposits of detrital material containing valuable minerals. The natural processes by which they form range from stone weathering to stream, marine, and wind action.

  • Pegmatites and aplites: Their genetic and applied …

    Fig. 1. a. Cross section through the Hagendorf-North pegmatite, SE Germany. The underground workings are shown by the galleries and shafts and rises.