TABLE 3

PROJECTED REQUIREMENTS AND AVAILABILITIES
 OF SELECTED METALS TO THE YEAR 2000
 (In Million Short Tons)


 Cumulative United United
 Demand States States b World b
Metal 1960-2000 Reserves Resources Reserves

Iron 4,700 3,400 25,800 144,500
Copper 112 50 100 270
Aluminum 255 13 100 900
Lead 38 4.5 80
Zinc 69 25 140
Manganese 73 0.9 78 450
Nickel 11.7 0.5 16
Tungsten .46 0.071 1.4


 Source: Hans Landsberg, Natural Resources for
United States Growth (Baltimore: Johns Hopkins Press
for Resources for the Future, Inc., 1964), p. 204.

 aReserves shown for the United States represent
known, measured reserves that can be exploited economically
by current techniques.

 bResources for the United States and World
Reserves represent amounts of metals that are known,
but are of too low grade to currently be exploited
economically. They also include inferred reserves,
those not actually known or measured, but for which
geological characteristics indicate that they might
exist. As such, the figures shown, especially for
World Reserves, should be considered as speculative.
Reserve figures vary by author and by agency.