Abstract: Turkey has rich bentonite deposits. However, particularly in drilling bentonite, new deposits will be needed in future, apart fromthe Kalecik (Ankara) and Reşadiye (Tokat) deposits. Thus, bentonite deposits located at the Kelkit Valley ought to be investigated in detail, and necessary technological processes be carried out, to involve the deposit in economic utilization. Yazıcık bentonite occurin the Upper Cretaceous volcano sedimentary sequence. They have formed by the alteration of andesitic tuff and pyroclastic materialin marine environment. Yazıcık bentonite deposits, investigated partly in detail, seems to be hopefull as molding sand binder, at least in one bed.