U.S. molybdenum production increased from 18.2 million pounds in 1946 to 90.5 million pounds in 1966 and constituted 87.3 percent of the total free world supply in the 1946-66 period. Molybdenum has important use as an alloying element in iron, steel, and high- temperature alloys. Consumption of molybdenum metal for making fabricated parts has increased in the past few years, especially in the space and nuclear industries. Molybdenum compounds are used mainly for making pigment, catalysts, and lubricants. Based on producer reports of shipments of primary products to domestic customers, U.S. comsumption increased from 16.5 million pounds of molybdenum in 1946 to 65.6 million pounds in 1966. Molybdenum reserves are now estimated to be 5.9 billion pounds of recoverable molybdenum, an increase of 2.1 billion pounds above previous estimates. Molybdenum ores account for 71.4 percent of the reserves, copper ores for 22.3 percent, and copper-molybdenum, tungsten, and uranium ores for 6.3 percent. Several methods for predicting future demand are illustrated and estimates of demand using these methods were made for 1975. Estimates of annual production were made for 1967 through 1975 for the United States, Canada, Chile, Peru, and the free world. These data indicate that molybdenum production in 1975 for the free world is expected to be 246 million pounds with the United States producing 68.2 percent and Canada, Chile, and Peru 30.3 percent.