The tin-tungsten mineralization in the Kruné hory Mts. /Erzgebirge shows a close spatial association with the granite contacts. This feature is explained by the structural control of solid endocontact part of the granite bodies for the import of postmagmatic solutions. The mineralizing solutions were derived from the deeper parts of the earth's crust, the ore deposits being thus in a paragenetic position to the granites. The tin-tungsten mineralization occurred during an interrupted process of metallization in the course of several stages. In the quartz veins a distinct intravenous metasomatism was observed with the replacement of earlier quartz vein fillings. The symmetrical selvages of some minerals around quartz veins originated by the replacement of quartz from the wall contact. The sections of the quartz veins with felspars resembling very closely the pegmatites were formed by the post-greisen metasomatism of the quartz veins. The emplacement of granites was accompanied by extensive wall- rock alterations of which potash- felspatization (I and II), albitization, greisenization, sericitization, kaolinization and hematitization were distinguished. The main geological and mineralogical features of the deposits are summarized in tables.