The Bureau of Mines determined costs associated with the production of tin from 18 market economy countries (mec's). The resource and relative economic positions of 146 tin deposits or regions were evaluated. The demonstrated resource of recoverable tin metal within the countries evaluated is estimated to be 2.8 million mt. Over 73 pct of this total is recoverable from three southeast Asian countries, Malaysia, Thailand, and Indonesia; all are members of the international tin council (itc). In recent years, Brazil, a nonmember of the itc, has become a major low-cost, high-volume supplier of tin and has tin resources that could allow it to maintain, or perhaps increase, current production levels. Given the 1984 tin market price of us $5.69 Lb in January 1984 dollars, over 60 pct of demonstrated tin resources are economically recoverable.