274 



40 to 704 per 1000 fr 



NATURAL GAS E 



-♦- 



Hfr 



L 



10 

 COAL 



13 



10 



14 



10 



15 



10 



16 



10 17 units 



$8 per ton 



H 1 tons 



$3 40 per barrel 



CRUDE OIL E 



p H barrels 



2.54 per ft J 



HELIUM 



H ( ft- 



$1 5.40 ton iron In ore concentrate $23 .40 



IRON | < ) 



944 per lb $2 per lb 

 NICKEL I I < I 



$1.62 per lb 



MOLYBDENUM I " 



i short tons 

 lb 



H lb 



TUNGSTEN | H I 



$43. $63. and $80 per ton 



SILVER [ 



$2.14 per oz $3.5 per oz 



| II troy oz 



10 



8 



$1.85 per lb 



10 



,10 



10' 

 $2.56 per lb 



units 



10 12 1.5 x 10 12 



COBALT E 



■+■ 



H 1 lb 



25 to 324 per lb 



ALUMINUM E 



404 per lb but see immense low-grade resources 

 J j j short tons 



$35 per oz 



goldE 



$47, $52, $145 per oz 

 I II I I troy oz 



$10perlbU.,O„ $15 $30 



URANIUM E 



3~8 



I   ! I short tons 



$54 to $64 per ton chromium in ore concentrate 



I | short tons 



CHROMIUM | I 



$2.50 per long ton manganese concentrate $3.60 $4.50 



t | ll long tons 



MANGANESE 



384 per lb 



COPPER E 

 ZINC f 



H 1 short tons 



13.54 per lb 



274 per lb 

 — 4-| 1 short tons 



LEADf 

 PLATINUM [ 

 MERCURY 



124 per lb 



174 per l b 

 I ( short tons 



Market price 



^ 



$200 per flask $1 500 per flask 



 - t ^] 77-lb flasks 



"2 troy oz 



1 



10= 



10 c 



10' 



10° 



10 J 



10" 



10 3 



10° 



10 9 units 



10 units 



Fig. 5 Reserves of selected U. S. 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. 



