252 
CONTRIBUTIONS   TO   ECONOMIC    GEOLOGY,    1904.        [bull.  260. 
resources  available  for  this  increasing  output.  In  many  cases  the 
tigures  of  production  available  are  estimates  only,  but  they  are 
believed  to  show  with  a  fair  degree  of  accuracy  the  relative  impor- 
tance of  the  different  countries  or  districts,  and  are  quoted  for  that 
reason. 
WORLD'S  PRODUCTION  OF  LEAD. 
In  1902,  the  last  year  for  which  complete  statistics  are  available, 
the  world's  production  of  lead  is  estimated  °  at  920,895  metric  tons. 
Of  this  amount,  the  United  States  produced  approximately  26  per 
cent,  Spain  19  per  cent,  Germany  15  per  cent,  and  Mexico  11  per 
cent.  Spain  and  Mexico  afforded  the  principal  surplus  production, 
both  Germany  and  the  United  States  using  somewhat  more  lead  than 
they  mined.  Great  Britain,  France,  and  Russia  were  the  main  bidders 
for  the  surplus.  The  following  table,  quoted  from  Mineral  Indus- 
try and  Mineral  Resources,  is  of  interest  in  this  connection : 
Production,  imports,  exports,  and  consumption  of  lead  in  the  chief  countries  of\ 
the  world  in  1902. 
[In  metric  tons.] 
Austria- 
Hun- 
gary." 
Bel- 
gium." 
France." 
Ger- 
many." 
Italy." 
Rus- 
sia." 
Spain." 
United 
King- 
dom." 
United 
States,  b 
13,543 
8,706 
19,500 
53,000 
18,817 
72,730 
140,  a31 
39,006 
26,494 
7,563 
250 
23,000 
177,560 
Nil. 
27,100 
235,522 
342,16(1 
65,233 
Total 
22,249 
53 
72,500 
50,000 
91,547 
6,454 
179,337 
23,100 
34,057 
5,650 
23,250 
Nil. 
177,560 
172,480 
262,622 
24,408 
407, 39^ 
129,632 
Consumption  _ . . 
22,196 
22,500 
85,093 
156,237 
28,407 
23,250 
5,080 
2:38, 21 4 
:.'77.758 
"The  Mineral  Industry  during  1903.  p.  230. 
/'Mineral  Resources  of  the  United  States,  1903,  p.  257.  (Stocks  included  with  exports  and 
imports,  and  production  including  that  from  foreign  ores  smelted  in  bond  as  well  as  that  fror 
domestic  ores.) 
WORLD'S  PRODUCTION  OF  ZINC. 
The  production  of  zinc  ore  and  of  spelter  for  1902  is  estimated  ii 
Mineral  Industry,  as  below.     The  distribution  by  individual  countries; 
is  unusual,  the  Rhine  district,  for  example,  being  ordinarily  given 
without  division,  and  the  figures  are  doubtless  somewhat  inaccurate 
as  to  detail. 
«  The  Mineral  Industry  during  1003,  p.  230. 
