84 
CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,  1904. 
|  BULL.  L'tfO. 
by  the  brecciation  of  the  ore  along  the  contact,  and  second,  by  the  fact 
that  the  vein  terminates  abruptly  against  it.  The  chief  ore  present  in 
the  vein  is  the  telluride  petzite.  The  gangne  minerals  of  this  ore 
have  not  yet  been  carefully  determined.  Through  the  kindness  of  the 
managers  the  following  statement  of  ore  values  is  given,  showing  the 
very  high  grade  of  the  ore  which  has  been  mined : 
Analysis  of  ore  of  Golden  Fleece  mine,  Lake  City  district,  Colorado. 
Class. 
Gold  per 
ton. 
Silver  per 
ton. 
Value. 
Dump 
Third  class  . 
Second  class 
First  class.  . 
Ounces. 
0.40 
2.00 
6.11 
134.10 
Ounces. 
15.00 
53. 00 
238. 00 
3,077.00 
$15. 1 
66.5 
351.2. 
4, 220. 5  J 
The  telluride  ore  occurs  in  an  irregular  tabular  shoot  which  i 
close  against  the  fault  plane  in  the  uppermost  level.  It  dips  steepl  J 
to  the  west  at  an  angle  of  about  60°,  a  very  much  steeper  angle  tha 
the  dip  at  the  fault  plane  (30°).  The  shoot,  therefore,  from  its  cor 
tact  with  the  fault  plane  gradually  diverges  from  it  as  it  is  followe 
downward. 
