﻿^°L 
  53-] 
  SUDBURY 
  NICKEL 
  DISTRICT 
  (CANADA). 
  59 
  

  

  Specific-gravity 
  determinations, 
  of 
  a 
  series 
  of 
  specimens 
  collected 
  

   along 
  the 
  railway 
  where 
  it 
  crosses 
  the 
  Windy 
  Lake 
  eruptive, 
  show 
  

   a 
  decrease 
  from 
  each 
  border 
  towards 
  the 
  centre, 
  where 
  the 
  lightest 
  

   and 
  most 
  acid 
  rocks 
  occur. 
  The 
  following 
  numbers 
  are 
  averages 
  of 
  

   pairs 
  of 
  specimens, 
  so 
  that 
  the 
  error 
  inherent 
  in 
  determinations 
  

   made 
  on 
  small 
  fragments 
  is 
  more 
  or 
  less 
  eliminated 
  : 
  — 
  

  

  Eastern 
  contact 
  2'714 
  

  

  2-746 
  

  

  2-690 
  

  

  Onaping 
  Station 
  2722 
  

  

  2-793 
  

  

  Western 
  contact 
  2*851 
  

  

  (iv) 
  The 
  Travers 
  Mine 
  Eruptive. 
  

  

  This 
  nickel-bearing 
  area 
  is 
  situated 
  in 
  the 
  townships 
  of 
  Drury 
  

   and 
  Denison, 
  about 
  25 
  miles 
  south-west 
  of 
  Sudbury. 
  It 
  is 
  most 
  

   easily 
  reached 
  from 
  Worthington 
  Station 
  on 
  the 
  ' 
  Soo 
  ' 
  branch 
  of 
  the 
  

   Canadian 
  Pacific 
  Railway. 
  Bell 
  maps 
  it 
  as 
  being 
  nearly 
  a 
  mile 
  wide 
  

   and 
  6 
  miles 
  long. 
  

  

  The 
  rock 
  on 
  the 
  dump 
  at 
  Travers 
  Mine 
  is 
  fine-grained, 
  dark 
  

   greenish-grey, 
  and 
  in 
  some 
  cases 
  exhibits 
  a 
  schistose 
  structure. 
  The 
  

   microscope 
  shows 
  that 
  it 
  is 
  composed 
  of 
  fine 
  granular 
  felspar, 
  uralitic 
  

   hornblende, 
  a 
  very 
  little 
  hornblende- 
  epidote, 
  and 
  iron 
  ores. 
  The 
  

   schistosity 
  is 
  often 
  very 
  distinct, 
  and 
  is 
  caused 
  by 
  the 
  bisilicates 
  

   forming 
  lengthened, 
  irregularly 
  - 
  pointed, 
  elliptical 
  areas, 
  which 
  

   alternate 
  with 
  granular 
  felspar-epidote 
  masses, 
  that 
  constitute 
  two- 
  

   thirds 
  of 
  the 
  rock. 
  

  

  Farther 
  south 
  the 
  rock 
  is 
  composed 
  of 
  the 
  same 
  minerals, 
  but 
  is 
  

   often 
  much 
  coarser. 
  Locally 
  there 
  are 
  small 
  patches 
  which 
  are 
  

   nearly 
  pure 
  felspar-epidote 
  aggregate, 
  while 
  in 
  other 
  places 
  there 
  

   are 
  dark 
  patches 
  which 
  contain 
  very 
  little 
  felspar-epidote 
  aggregate. 
  

   A 
  mile 
  and 
  a 
  quarter 
  south 
  of 
  the 
  mine 
  the 
  rock 
  becomes 
  very 
  much 
  

   coarser. 
  

  

  The 
  rocks 
  of 
  this 
  area 
  resemble 
  the 
  well-known 
  flaser-gabbros 
  of 
  

   Rosswein, 
  Saxony, 
  and 
  differ 
  widely 
  from 
  the 
  rocks 
  of 
  the 
  two 
  areas 
  

   already 
  studied. 
  At 
  present 
  it 
  is 
  composed 
  of 
  saussurite 
  flaser- 
  

   gabbro, 
  especially 
  rich 
  in 
  saussurite. 
  The 
  flaser-structure 
  has 
  pro- 
  

   bably 
  been 
  caused 
  by 
  great 
  pressure, 
  which 
  hastened 
  the 
  uraliti- 
  

   zation 
  and 
  saussuritization 
  of 
  the 
  components, 
  and 
  may 
  have 
  pro- 
  

   duced 
  the 
  crushed 
  granite 
  north 
  of 
  the 
  Travers 
  Mine. 
  I 
  have 
  not 
  

   determined 
  the 
  relation 
  of 
  the 
  gabbro 
  to 
  the 
  granite 
  north 
  of 
  the 
  

   mine, 
  but 
  I 
  think 
  that 
  the 
  two 
  are 
  genetically 
  distinct. 
  

  

  Y. 
  Other 
  Nickelieerous 
  Areas. 
  

  

  The 
  Stobie 
  Mine 
  is 
  connected 
  with 
  a 
  long 
  narrow 
  area 
  of 
  some- 
  

   what 
  schistose 
  greenstone, 
  which 
  is 
  only 
  a 
  few 
  yards 
  wide 
  where 
  

   crossed 
  by 
  the 
  Blezard 
  branch 
  of 
  the 
  Canadian 
  Pacific 
  Railway. 
  

   The 
  specimens 
  collected 
  indicate 
  an 
  approach 
  to 
  amphibolite. 
  The 
  

   Huronian 
  rocks 
  have 
  been 
  metamorphosed 
  by 
  this 
  now 
  highly-altered 
  

  

  