A    MINERAL    PEOSPECT    IX     MAINE.  110 
well  shown  the  sulphides  occur  more  generally  in  the  matrix,  and  in 
the  amygdaloidal  phases  the  metallic  minerals  are  found  in  the 
amygdules. 
A  sample  of  ore  was  collected  at  the  small  opening  designated  the 
No.  6  prospect.  Care  was  taken  to  procure  a  representative  sample, 
with  the  view  of  determining  the  value  of  the  material  such  as  would 
necessarily  be  mined  and  shipped  from  a  deposit  of  this  type.  Such 
selection  was  made  to  secure  a  good  sample  of  the  possible  shipping 
product.  The  same  quality  of  mineralized  rock  occurs  at  most  of  the 
openings,  but  at  none  could  any  commercial  quantity  of  better  grade 
ore  be  mined.  On  this  account  the  sample  is  believed  to  be  represent- 
ative of  this  deposit  and  probably  also  to  a  large  extent  of  other 
bodies  of  mineralized  rock  in  this  region. 
The  assay  of  this  sample  by  Ledoux  &  Company  of  New  York, 
follows: 
Assay  of  ore  from  West  Pembroke,  Me. 
Copper  by  electrolytic  assay per  cent.     0. 08 
Zinc do 1. 26 
Lead do 51 
Silver  (per  ton  2,000  pounds) ounce . .       .13 
Gold  (per  ton  2,000  pounds) Trace. 
While  this  assay  indicates  a  total  content  of  between  $2  and  $3, 
under  the  present  high  prices  of  metals,  the  values  are  so  distributed 
among  the  four  metals  that  this  valuation  expresses  little.  No  com- 
mercial process  is  known  that  would  win  all  these  metals,  and  with 
any  treatment  now  in  use  the  cost  of  the  recovery  of  any  two  of  them 
would  doubtless  exceed  the  value  of  the  very  small  content  in  this 
rock.  It  can  therefore  be  stated  with  confidence  that  the  cost  of 
mining  and  treating  an  ore  of  this  type  would  be  prohibitive. 
