A new type of tin ore in Eastern Kazakhstan

Stanniferous ores of quartz-sulfide-tourmaline type in a part of the Delbegetey ore field, within the Kalba zone, resemble the Far-Eastern ones by their geological position, but show no resemblance or kinship with any of Kalba ores. Their cassiterite is relatively high in indium but is almost free from tantalum and Miobium, in contrast with the other cassiterites of Kalba. Their mineralization, imposed as it is onto dikes of the second stage, may have connections with the Semeytau volcanic-plutonic complex, but not with the Kalba granites. —V.P. Sokoloff.