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Thesupce-largesealetin-polymctallicoredepositsintheTongkeng-ChangpomineisoneofthemostimportantoredepositsintheDacliangtin-polymctallicorefield,locatedinYunnan-GuangxiDiwaSeriesofSoutheasternChinadiwaregion,oceurinasedimentaryrockserieswhiehiscomposedofsil