GRANITE-BIMETALLIC    AND    CABLE    MINES,   MONTANA. 
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scopic  study,  and  other  minerals  should  doubtless  be  added  to  it. 
Forty  minerals  or  varieties  are  noted.  Of  these  25  per  cent  are 
peculiar  to  the  Cable,  25  per  cent  peculiar  to  the  Granite,  and  50  per 
cent  are  common  to  both  mines. 
Comparison  of  minerals  in  the  Granite- Bimetal  lie  and  Cable  mines. 
Minerals. 
Oxides. 
Limonite 
Hematite 
Specula  rile 
Magnetite 
Manganese  oxide.  . 
Native  metals. 
Gold 
Silver 
Copper 
Carbonates. 
Calcite 
Rhodochrosite. . . . 
Siderite 
Dolomite 
Malachite 
Azurite 
Sulphate. 
Iron  sulphate 
Sulphides. 
Pyrite 
Pyrrhotite 
Marcasite 
Chalcopyrite 
Bornite! 
Argentite 
Chalcocite 
Arsenopyrite 
Ruby  silver  (pyrargy- 
rite  and  proustite). 
Gray  copper  (te1  rahe- 
drite  and  tennantite) . 
Galena 
Blende 
Realgar 
Orpiment 
Silicates. 
Quartz. 
Rhodonite... 
Chrysocolia. . 
Actinohte. . . 
Wollastonite. 
Garnet 
Green  mica . . 
Epidote...  . 
Kaolinite 
Granite-Bimetallic  mine  (a  silver- 
gold  fissure  vein  in  granite),  2,600 
feet  deep. 
In  upper  levels 
....do 
None 
Sparingly  present  in  upper  levels. 
Considerable  in  upper  levels 
Finely  divided  throughout  the  mine. 
In  upper  levels 
None 
Very  sparingly  present 
Considerable 
None 
A  little 
In  upper  levels 
do 
Common  as  crystals  on  walls. 
Abundant 
None 
....do 
A  little 
....do 
At  many  places 
Little  or  none 
Abundant  in  lower  levels 
At  all  depths  below  200  feet,  but  less 
abundant  in  lower  levels. 
In  lower  and  middle  levels 
At  many  places 
do 
Here  and  there. 
....do 
Very  abundant . 
At  many  places . 
In  upper  levels. 
None 
....do 
....do 
....do 
....do 
Abundant ...... 
Cable  mine  (a  gold-copper  contact- 
metamorphic  deposit  in  limestone 
and  shale  at  contact  with  granite  i , 
600  feet  deep. 
In  upper  levels. 
Do. 
Throughout  the  mine. 
Very  abundant  on  all  Lev<  Is. 
A  little  in  upper  levels. 
Large  nuggets  chiefly  in  upper  work- 
ings; small  anhedra  on  all  levels. 
No  native  silver  noted. 
A  little  in  upper  levels. 
Very  abundant  on  all  levels. 
None. 
A  little. 
Do. 
In  upper  levels.    • 
Do. 
Common  as  crystals  on  walls. 
Abundant. 
At  many  places. 
A  little.' 
At  many  places. 
Do/ 
Some. 
A  little. 
A  little  in  lower  levels. 
None. 
Do. 
Rare. 
Do. 
None. 
Do. 
Much  less  abundant  than  in  Granite- 
Bimetallic  mine. 
None. 
In  upper  levels. 
At  many  places. 
Here  and  there. 
Do. 
At  many  places. 
Here  and  there. 
Not    so    abundant     as    in    Granite- 
Bimetallic  mine. 
