Bureau of Mines personnel evaluated the potential availability of nickel from 151 deposits in 18 market economy countries and selected 126 for detailed analyses. An evaluation was made of tonnage-cost relationships indicating the quantity of nickel available at various total costs of production expressed in dollars per pound nickel, including a 15-pct rate of return on the invested capital. The 126 deposits studied contain approximately 73 million metric tons (t) of nickel. An estimated 52 million t is available from laterite deposits, of which less than 2 pct would be produced at $3.50/Lb ni, about equal to the average published price of nickel in 1981. Approximately 21 million t can be produced from sulfide deposits, of which about 10.0 million t can be produced at $3.50/Lb. Sensitivity studies indicate that the total cost of nickel from laterites is most sensitive to increases in energy costs, and that sulfides are most sensitive to increases in labor costs; sulfides are also sensitive to changes in byproduct revenues. In 1983, the Nickel Mountain Mine in Oregon was the only U.S. producer, although development continued on the gasquet property in California. About 1.02 million t of recoverable nickel in the United States is available at or below $3.50/Lb.