84 
CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,   1903.  ibull.225. 
selected  quartz,  the  selection  being-  such  as  could  readily  be  made 
in  ore  sorting,  and  the  assay  of  this  sample,  made  by  Dr.  E.  T.  Allen  in 
the  Survey  laboratory,  is  given  below  under  A. 
At  vein  No.  6,  the  sample  was  an  average  across  the  vein,  where  6 
feet  of  quartz  is  exposed  in  the  shaft,  including  the  narrow  streak  of 
galena  and  pyrite  described  above.  The  assay  of  this  sample  is  given 
under  B.  The  calculated  value  per  ton  of  the  material  of  which  the 
two  assays  have  been  made  would  be,  at  average  market  prices  of 
the  contained  metals,  63  and  55  cents,  respectively. 
Assays  of  ore  from  the  Mount  Glines  mine,  Oxford  County,  Me.a 
A. 
B. 
c. 
Gold 
None. 
None. 
0.16 
0.25 
None. 
None. 
0.18 
0.08 
Trace. 
Silver , 
ounce. . 
3.50 
Copper  
Lead 
per  cent. . 
do.... 
3.33 
47.95 
a  Assays  A  and  B,  by  E.  T.  Allen,  U.  S.  Geol.  Survey;  assay  C,  by  Milton  L.  Hersey,  city  and  provin- 
cial analyst  of  Montreal. 
Contrasted  with  assays  A  and  B  is  the  assay  C,  made  for  the  Mount 
Glines  Gold  and  Silver  Mining  Company.  The  value  of  the  ore  as 
calculated  from  the  assay  is  given  as  $49.68. 
This  sample  was  taken,  it  is  reported,  from  the  No.  1  vein  at  a  depth 
of  about  35  feet.  In  comparing  this  assay  with  the  assay  of  the  sample 
from  the  same  shaft,  as  given  above  under  A,  it  will  be  noted  that  the 
value  is  almost  wholly  in  the  copper  and  lead.  Again,  the  high  per- 
centage of  lead  shows  that  the  sample  sent  to  Mr.  Hersey  was  almost 
55  per  cent  pure  galena.  This  indicates  the  method  employed  in  col- 
lecting the  sample,  which,  indeed,  is  comparable  to  a  low  grade  of  coarse 
mill  concentrates  rather  than  to  ore  as  mined.  This  assay  is  to  bej 
regarded  as  that  of  a  cabinet  specimen  of  galena,  rather  than  of  an  ore 
body.  In  determining  the  possible  value  of  a  quartz  vein  the  only 
assa}\s  that  can  be  used  as  a  basis  for  calculation  are  assays  of  average 
samples  across  the  vein,  like  B  in  the  table  given  above,  or  of  samples 
like  A,  of  selected  ore  picked  with  no  more  discrimination  than  isj 
possible  in  the  ordinary  sorting  of  ore  by  miners. 
Development  work  has  been  continued  on  the  Mount  Glines  prop! 
erty  and  the  streak  of  sulphides  is  reported  to  have  increased  in 
width  and  in  percentage  of  copper.  At  present  nothing  more  definite 
can  be  stated  concerning  the  value  of  such  quartz  veins  than  is  giver 
above.  All  the  assays  indicate  that  the  ore  is  in  no  sense  gold  bearing, 
and  even  in  the  best  assay  the  silver  content  is  no  greater  than  is  to  b( 
expected  in  a  galena  ore.  Whether  these  veins  contain  copper  and  leac 
in  profitable  amounts  will  depend  upon  future  developments,  but  th< 
