ALUMINUM. 
The  known  bauxite  districts  of  the  United  States  were  examined  and  reported  on  in 
letail  some  years  ago  by  Dr.  C.  W.  Hayes,  and  so  far  no  large  extension  of  the  industry 
ias  taken  place  outside  the  area  covered  by  his  work.  That  such  an  extension  is  possible, 
lowever,  is  evidenced  by  discoveries  which  have  been  made  during  the  past  two  years, 
bauxite  deposits  of  more  or  less  promise  have  been  uncovered  in  the  vicinity  of  Fort  Payne, 
Ua.,  as  well  as  in  Tennessee,  Virginia,  and  Pennsylvania.  In  all  these  cases  the  bauxite  is 
tssociated  with  Cambrian  or  Cambro-Ordovician  rocks — the  Knox  or  Shenandoah  limestone 
f  the  valley  regions — so  that  the  newly  found  ore  bodies  correspond  clearly  to  the  type 
lescribed  by  Hayes  from  Alabama  and  Georgia. 
SURVEY    PUBLICATIONS    ON    ALUMINUM    ORES-BAUXITE, 
CRYOLITE,  ETC 
The  following  reports  published  by  the  Survey  contain  data  on  the  occurrence  of  alumi- 
|ium  ores  and  on  the  metallurgy  and  uses  of  aluminum: 
Canby,  H.  S.     The  cryolite  of  Greenland.     Nineteenth  Ann.  Kept.,  pt.  6,  pp.  615-617.     1898. 
Hayes,  C.  W.    Bauxite.    In  Mineral  Resources  U.  S.  for  1893,  pp.  159-167.    1894. 
The  geological  relations  of  the  southern  Appalachian  bauxite   deposits.    Trans.    Am.   Inst. 
Min.  Eng.,  vol.  24,  pp.  243-254.     1895. 
Bauxite.     Sixteenth  Ann.  Rept.,  pt.  3,  pp.  547-597.     1895. 
The  Arkansas  bauxite  deposits.     Twenty-first  Ann.  Rept.,  pt.  3,  pp.  435-472.     1901. 
Schnattekbeck,  C.  C.    Aluminum  and  bauxite  (in  1904) .     In  Mineral  Resources  U.  S.  for  1904,  pp. 
285-294.     1905. 
Struthers,  J.    Aluminum  and  bauxite  (in  1903).     In  Mineral  Resources  U.  S.  for  1903,  pp.  265-280. 
1904. 
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