340 
CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,  1904. 
Lbull.  26(m 
of  the  ore,  for  no  outcrops  of  such  rocks  appear  within  a  half  mile  of 
the  mine.  Partial  analyses  of  the  ore  follow,  taken  from  the  Tenth 
Census  Report,  volume  15,  page  134,  analysis  No.  1  being  of  carload 
lots  of  washed  ore  and  No  2  of  a  selected  specimen  of  limonite : 
Analyses  of  iron  ore  from,  the  Manhattan  mine,  near  Sharon,  N.  Y. 
Metallic  iron 
Phosphorus 
Phosphorus  in  100  parts  iron. 
Manganese  protoxide 
47.77 
.086 
.180 
50.13 
.  038 
.076 
1.93 
Amenta   mines. — The   Amenia   group   of   mines   is   located   three 
fourths  of  a  mile  west  of  Amenia  station,  in  a  narrow  limestone  val 
ley  between  two  ridges  of  Hudson  schist.     As  shown  in  the  sectioi 
all  these  rocks  dip  steeply  (50°-60°)  to  the  east  and  strike  about 
15°   E.     The  hanging  wall  of  the  deposit  is  a  dark-colored  mics 
schist;   the  foot  wall  is  Stockbridge  limestone.     The   principal  oi 
worked  is  brown  hematite,  but  iron  carbonate  occurs,  being  partici 
larly  common  in  the  more  southerly  workings,  where  the  limonil 
body  is  apparently  widest.     Little  siderite  now  shows  in  the  presei 
underground  workings,  which  are  near  the  northern  end  of  the  ol< 
pit.     In  one  of  the  old  pits  limestone  was  found  nearly  all  the  wa| 
across  the  opening,  under  the  ore.     The  carbonate  occurred  at  tl 
bottom  of  the  opening  in  bedded  form,  the  beds  dipping  steeply  cast 
ward.a     This  carbonate  ore  was  smelted  at  the  Wassaic  furnace,  ai 
Gridley  b  has  described  the  rather  unusual  character  of  the  iron  ma< 
from  it. 
Analyses  of  Amenia   ores  follow,  No.  3  being  of  the  carbonat 
above  mentioned : 
Analyses  of  iron  ore  from  the  Amenia  mines,  Dutchess  County,  N.  Y. 
Metallic  iron 
Phosphorus 
Phosphorus  in  100  parts  iron 
48.99 
.413 
.843 
48.28 
.092 
.190 
42. 
053 
123 
National  mine. — The  National  mine  is  located  W2.J   miles  west   of 
Pawling,  N.  Y.     The  ore  body  has  for  foot   wall  a  body  of  Hudson 
"  Smock,  J.  0.,  Bull.  N.  Y.  State  Museum  No.  7,  p.  57. 
b  Gridley,   10.,   Note  concerning  a  grade  of  iron  made   from  carbonate  ore:   Trans.   Ai 
Inst.  Min.  Eng.,  vol.  12,  pp.  520-522, 
