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up to now, more than kinds of natural minerals have been identified in the korean region, among which the mineral deposits with economic development value account for about % of the land area, and more than kinds of economically useful minerals. other minerals in the top are tungsten, molybdenum, graphite
up to now, more than kinds of natural minerals have been identified in the korean region, among which the mineral deposits with economic development value account for about % of the land area, and more than kinds of economically useful minerals. other minerals in the top are tungsten, molybdenum, graphite...
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