256  CONTRIBUTIONS    TO   ECONOMIC    GEOLOGY,  1904.        [bull.  260g 
The  Tooele  County  production  is  mainly  from  the  Mercur  district, 
which  has  been  described  by  Mr.  Spurr.a 
Colorado. — No  very  accurate  recent  statistics  of  the  production  by 
counties  in  this  State  are  available.  The  estimates  of  Mr.  E.  L. 
White,  commissioner  of  mines,  for  the  year  1903  are  given  below : 
Lead  production  in  Colorado  in  1903,  hy  counties. 
Short  tons. 
Lake   18,177 
Pitkin   16,  635 
Mineral 4,  300 
San  Juan 3,485 
Clear  Creek 1,726 
Ouray   1, 675 
Hinsdale 230 
Others 4,520 
Total  50,757 
The  Lake  County  production  is  from  the  Leadville  mines,  which 
have  been  described  in  detail  by  Mr.  Emmons,1  and  the  Pitkin  County 
production  from  the  Aspen  mines,  described  by  Mr.   Spurr.c     The 
San  Juan  output  is  from  the  Silverton  mines,  described  by  Mr.  Ran- 
somed   The  Mineral  County  production  is  that  of  the  Creede  mines  ;j 
that  of  Hinsdale  County  is  from  Lake  City,  and  that  of  Ouray  Count; 
is  from  mines  near  the  town  of  the  same  name.    The  Lake  City  anc 
Ouray  mines  have  been  studied  by  Mr.  Irving  and  a  preliminary  state- 
ment of  the  results  is  given  in  this  bulletin.    The  Clear  Creek  Count] 
mines  are  also  described  by  Mr.  Spurr,  while  the  Summit  Count; 
mines,  among  the  most  important  of  the  minor  producers,  have  beei 
discussed  by  Mr.  Emmons,  in  the  Tenmile  District  Special  folio.c 
Minor  western  production. — Aside  from  Idaho,  Utah,  and  Colo- 
rado, relatively  little  lead  is  produced  in  the  Western  States.  While 
lead-bearing  minerals  are  widely  distributed,  the  deposits  are  not 
worked,  and  the  fact  that  this  condition  has  continued  througj 
many  years  of  active  development  of  the  mining  industry  may  b< 
fairly  interpreted  as  having  basis  in  the  original  quantitative  distri- 
bution of  lead.  California,  so  famous  for  the  abundance  and  variety 
of  mineral  products,  has  never  been  an  important  producer  oi 
either  lead  or  zinc.     Montana,  with  its  great  wealth  of  copper  anc 
a  Spurr,  J.  E.,  Economic  geology  of  the  Mercur  mining  district,  Utah  :   Sixteenth  Am 
Kept.  TJ.  S.  Geol.  Survey,  pt.  2,  1895,  pp.  343-456. 
6  Emmons,  S.  P.,  Geology  and  mining  industry  of  Leadville  :  Mon.  U.  S.  Geol.  Survej 
vol.  12,  1886,  870  pp. 
c  Geology  of  the  Aspen  mining  district,  Colorado,  with  atlas:  Mon.  U.  S.  Geol.  Survey, 
vol.  31,  1898,  260  pp. 
a  Report  on  the  economic  geology  of  the  Silverton  quadrangle:  Bull.  U.  S.  Geol.  Survey 
No.  182,  1901,  265  pp. 
c  Geologic  Atlas  U.  S.,  folio  81,  U.  S.  Geol.  Survey,  1898. 
