272 



40 to lOt per 1000 ft 3 



GAS 



5EZ3-- 



H ft" 



10 



13 



10 14 

 $10 per ton 



10 



15 



10 



16 



10 17 units 



COALt 



^ 1 tons 



$3.40 per barrel 



CRUDE OIL^ 



~ \ \ 1 barrels 



2.54 per ft J 



Hft J 



HELIUM \ j 



$15.40 per ton iron in ore concentrate $23 40 per ton 



1 short tons 



IRON 



■+- 



944 per lb 



NICKEL £ 



-lib 



MOLYBDENUM 



$1.62 per lb 



t ^ 1 lb 



$43 to $63 per ton 

 TUNGSTEN | I I lb 

 $1.85 per lb 

 COBALT | I 1 lb 



Tons (at 324 per lb) but see immense low-grade resources 

 ALUMINUM fy short tons 

 $145 per oz 

 GOLD | I j troy oz 



$2.14 per oz $3.5 per oz 

 SILVER | 



I ^ — I troy oz 



I 



_L 



I 



10 s 



10 



10 



10 



1 1 



10 



12 



10 13 units 



$15perlbU 3 O g $30 per lb 



URANIUM 



k | t short tons 



CHROMIUM £ 

 MANGANESE F 



$54 to $64 per ton chromium in ore concentrate 



^ short tons 



$53.5 per ton 



j I short tons 



COPPER F. 

 ZINC F 



384 per lb 



H 1 short tons 



13.54 per lb 



274 per lb 



^ 1 short tons 



124 to 174 per lb 



LEAD £ 



TIN £ 



PLATINUM F 



H I short tons 



$1.54 to $1.90 per lb 



■T] short tons 



Market price 



H troy oz 



$200 per flask $1500 per flask 



MERCURY E 



•+- 



3 1 77-lb flasks 



10° 



10° 



10' 



10° 



10 9 units 



Fig. 4 Reserves of selected global mineral commodities compared with 

 cumulative demand, 1968 to 2000. Scale is logarithmic; prices are in 1968 

 dollars; all lines have their zero points to left of chart; note variable nature of 

 unit quantities. Data from U.S. Bureau of Mines (1970), supplemented by 

 U. S. Bureau of the Census (1970) and Committee on Resources and Man 

 (1969). The median lines show optimistically estimated reserves as of 1968, 

 and the shaded boxes indicate cumulative demand, 1968 to 2000. Total 

 reserves at different costs are indicated by position of vertical tick to right of 

 cost per unit. 



