326 
CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,  1904.         [bull.  260. 
good  ore  in  this  strip  of  the  formation  in  the  southern  part  of  sec. 
8,  T.  22  N.,  R,  7  W.,  and  a  mine  has  been  opened  in  it  by  Mr.  W.  P. 
Pinckard,  of  Birmingham.  In  November,  1904,  the  slope  had  been 
driven  in  440  feet  on  a  bed  dipping  15°  to  18°  in  a  direction  S.  65°  E.J 
The  seam  is  reported  to  be  about  10  feet  thick,  although  but  6|  to  I 
feet  of  good  clean  ore  is  removed  in  mining.  Some  ore  is  left  at 
the  top,  since  the  clay  shale  overlying  the  ore  body  was  considered 
an  unsafe  roof.  Extensive  development  is  projected  here,  sincei 
prospecting  with  a  core  drill  has  yielded  results  that  seemed  to  war- 
rant it.  Limestone  suitable  for  fluxing  is  exposed  over  an  area  of 
25  to  30  acres,  along  the  upper  part  of  Big  Sandy  Creek,  less  thanji 
a  mile  east  of  the  mine. 
Representative  samples  of  the  leached  (I)  and  partly  leached  I 
(II)  ore  from  this  slope  have  been  analyzed  by  George  Steiger  in  thd< 
laboratory  of  the  United  States  Geological  Survey  with  the  following^ 
results : 
Partial  analyses  of  ore  from  Pinckard' 's  mine. 
Metallic  iron 
Lime  (CaO) 
Phosphorus 
Insoluble  in  HC1  and  HNOs  (mainly  silica) 
Per  cent. 
40. 2G 
1.11 
.42 
32.40 
II. 
Per  rent. 
38. 1 
7.4$ 
.3( 
21.H 
Still  farther  to  the  southwest,  and  evidently  greatly  oifset  bj 
faulting,  are  two  short  ridges  of  the  Rockwood  formation  in  sec.  2 
T.  24  N.,  R.  7  W.,  on  Big  Sandy  Creek,  not  far  from  the  old  Clements 
homestead.  A  sandy  red  ore  is  reported  to  outcrop  near  the  bas< 
of  the  southeast  of  the  two  ridges,  but  this  is  of  interest  principally 
because  it  is  the  most  southwesterly  outcrop  of  the  formation  on  tin 
northwest  side  of  Roups  Valley. 
On  the  southeast  side  of  Roups  Valley  the  Rockwood  forma tioi 
enters  the  quandrangle  about  1J  miles  south  of  McCalla,  in  sec.  7 
T.  20  K,  R.  4  W.,  and  extends  in  a  direction  S.  45°  W.  along  Re( 
Mountain  to  sec.  7,  T.  21  N.,  R.  5  W.,  about  1J  miles  southeast  o 
Green  Pond.  In  this  vicinity  the  strike  swings  gradually  around  t 
S.  30°  W.,  and  the  trend  of  the  formation  is  in  this  direction  fo 
about  8  miles.  This  strip  of  the  formation  is  crossed  by  the  Ala  i 
bama  Mineral  division  of  the  Louisville  and  Nashville  Railroad  a 
Big  Spring,  in  the  SE.  J  of  SE.  J,  sec.  34,  T.  21,  N.,  R.  G  W.,  and  i> 
apparently  about  350  feet  thick.  An  attempt  to  mine  the  ore  a 
Big  Spring  was  made  by  Dr.  G.  B.  Crowe,  of  Birmingham,  but  th 
enterprise  was  apparently  unprofitable,  since  it  was  soon  discor 
