CLINTON    ORES    OF    BIRMINGHAM    DISTRICT,   ALABAMA. 
143 
Character  of  Big  and  Irondale  seams  at  open  cut,  Greenspring  mine  S  W.  \  sec.  11,  T.'J,  N. 
R.  3  W. — Continued. 
Strata. 
Shale 
Sandstone 
Shale 
Ore,  sandy 
Shale - 
Ore,  sandy 
Shale 
Irondale  (?)  seam: 
Ore,  very  sandv 
Shale...' 
Sandstone,  fine  grained,  very  fer 
ruginous. 
Shale 
Sandstone,  fine  grained,  very  fer 
ruginous. 
Shale. 
Sandstone,  very  ferruginous 
Shale 
Sandstone,  very  ferruginous 
3hale. 
Character. 
■Not  minable. 
At  Graces  Gap  only  the  Big  seam  appears  to  be  present.     It  has  a 
thickness  of  about  22  feet  here,  and  the  upper  bench,  10  to  12  feet  of 
ore,  is  mined.      Four  miles  southwest  of  the  locality  of  the  foregoing 
ection  the  ore  presents  the  following  phase: 
Character  of  Big  and  Irondale  seams  at  mouth  of  slope  No.  12,  Tennessee  Coal,  Iron  and 
Railroad  Company,  SE.  i  sec.  20,  T.  IS  S.,  R.  3  W. 
Strata. 
Thickness. 
Character. 
shale  and  sandstone  in  thin  beds. 
3ig  seam: 
Ft.    in. 
8-10    0 
9    0 
2     1 
1    3 
4 
8 
6 
1 
8 
3 
1    3 
1 
7 
[Hard  ore:  Metallic  iron,  35±  percent;  insoluble, 
18±  percent;  lime,  16±  percent.     Only  hard  ore 
[    mined  now. 
Not  minable  under  present  conditions. 
Shale,  thin  parting. 
Ore,  lean  and  siliceous,  with  a  few 
local  shale  partings. 
Ore,  oolitic    and    fossiliferous,    in 
thin     bands     alternating     with 
streaks  of  calcite  and  shale. 
)re...            
Ihale     
rondale  (?)  seam: 
Shale 
Shale 
/Not  minable. 
Shale 
|hale,  sandy. 
Five  miles  southwest  of  slope  No.  12  is  that  part  of  Red  Mountain 
vhich  lies  opposite  Bessemer.  Here  the  parting  between  the  upper 
uid  lower  benches  of  the  Big  seam  reaches  a  thickness  of  3  feet  in 
places.  The  upper  bench  maintains  its  usual  quality  and  its  thick- 
less  of  10  to  11  feet,  8  to  10  feet  of  which  are  taken  in  mining.  Thin 
itreaks  and  lenses  of  shale  begin  to  appear  near  the  top  and  bottom 
