﻿V°l- 
  53'] 
  THE 
  SUDBURY 
  NICKEL 
  DISTRICT 
  ( 
  CANADA). 
  65 
  

  

  The 
  proportions 
  of 
  ferrous 
  oxide 
  and 
  titanic 
  acid 
  are 
  unusually 
  

   large. 
  The 
  latter 
  doubtless 
  occurs 
  partly 
  in 
  the 
  magnetite 
  and 
  

   ilmenite 
  and 
  partly 
  in 
  the 
  augite, 
  giving 
  this 
  last 
  its 
  peculiar 
  violet 
  

   colour. 
  It 
  has 
  long 
  been 
  known 
  that 
  nickel 
  is 
  a 
  frequent 
  constituent 
  

   of 
  the 
  heavy 
  ferro-magnesian 
  minerals, 
  especially 
  of 
  olivine 
  and 
  

   pyroxene, 
  and 
  it 
  is 
  probable 
  that 
  the 
  heavy 
  metals 
  contained 
  in 
  the 
  

   diabase 
  are 
  constituents 
  of 
  these 
  silicates. 
  Whether 
  the 
  nickel, 
  

   cobalt, 
  and 
  copper 
  were 
  primarily 
  constituents 
  of 
  the 
  diabase-magma 
  

   or 
  not 
  would 
  be 
  difficult 
  to 
  say, 
  as 
  they 
  may 
  have 
  been 
  derived 
  from 
  

   the 
  nickel-bearing 
  greenstones 
  which 
  are 
  intersected 
  by 
  these 
  dykes. 
  

   Fragments 
  of 
  the 
  nickel-bearing 
  rocks 
  may 
  have 
  been 
  absorbed 
  by 
  

   the 
  diabase-magma. 
  I 
  am, 
  however, 
  inclined 
  to 
  regard 
  the 
  nickel 
  

   content 
  of 
  the 
  diabase 
  as 
  a 
  constituent 
  of 
  the 
  original 
  diabase- 
  

   magma. 
  No 
  nickel-deposits 
  have 
  been 
  found 
  associated 
  with 
  these 
  

   dyke-rocks. 
  

  

  Had 
  the 
  nickeliferous 
  diabase 
  solidified 
  more 
  slowly 
  and 
  been 
  

   richer 
  in 
  sulphur, 
  the 
  nickel 
  would 
  probably 
  have 
  separated 
  as 
  iron- 
  

   nickel 
  sulphides 
  along 
  the 
  border, 
  as 
  it 
  did 
  in 
  the 
  case 
  of 
  the 
  nickel- 
  

   bearing 
  greenstones, 
  where 
  these 
  differentiations 
  of 
  pyrrhotite-norite 
  

   now 
  constitute 
  the 
  most 
  extensive 
  nickel-deposits 
  in 
  the 
  world. 
  

  

  The 
  map 
  which 
  accompanies 
  this 
  paper 
  is 
  founded 
  on 
  that 
  issued 
  

   by 
  the 
  Canadian 
  Geological 
  Survey. 
  It 
  differs, 
  however, 
  in 
  two 
  

   ways 
  from 
  the 
  Government 
  map. 
  Firstly, 
  I 
  have 
  omitted 
  much 
  of 
  

   the 
  detail 
  both 
  in 
  topography 
  and 
  geology, 
  and 
  have 
  reproduced 
  only 
  

   such 
  features 
  as 
  are 
  necessary 
  to 
  illustrate 
  the 
  present 
  paper. 
  The 
  

   second 
  difference 
  is 
  wholly 
  geological, 
  and 
  consists 
  in 
  such 
  changes 
  

   as 
  my 
  own 
  explorations 
  showed 
  to 
  be 
  necessary. 
  These 
  changes 
  

   are 
  principally 
  connected 
  with 
  the 
  Whitson 
  Lake 
  and 
  Windy 
  Lake 
  

   eruptives, 
  and 
  with 
  the 
  Younger 
  Granites. 
  

  

  The 
  investigations 
  reported 
  in 
  this 
  paper 
  were 
  carried 
  on 
  under 
  

   the 
  direction 
  of 
  Herr 
  Geheimrath 
  Professor 
  Zirkel. 
  It 
  affords 
  me 
  

   great 
  pleasure 
  to 
  acknowledge 
  my 
  indebtedness 
  to 
  him 
  for 
  his 
  

   friendly 
  advice 
  and 
  encouragement. 
  

  

  VIII. 
  Literature. 
  

  

  Adams, 
  F. 
  D. 
  ' 
  On 
  the 
  Igneous 
  Origin 
  of 
  certain 
  Ore 
  Deposits.' 
  Mining 
  

   Association 
  of 
  the 
  Province 
  of 
  Quebec. 
  Montreal, 
  1894. 
  

  

  Barlow, 
  A. 
  E. 
  ' 
  Nickel 
  and 
  Copper 
  Deposits 
  of 
  Sudbury.' 
  Ottawa 
  Naturalist, 
  

   1891. 
  

  

  Bell, 
  Eobert. 
  ' 
  The 
  Nickel 
  and 
  Copper 
  Deposits 
  of 
  Sudbury, 
  Canada.' 
  Bull. 
  

   Geol. 
  Soc. 
  Am. 
  vol. 
  ii. 
  (1891) 
  pp. 
  125-137. 
  

  

  . 
  ' 
  Report 
  on 
  the 
  Sudbury 
  Mining 
  District.' 
  Geol. 
  Survey 
  of 
  Canada, 
  

  

  1891, 
  Ann. 
  Rep. 
  pt. 
  i. 
  F. 
  

  

  Bonney, 
  T. 
  G-. 
  ' 
  Notes 
  on 
  a 
  Part 
  of 
  the 
  Huronian 
  Series 
  in 
  the 
  Neighbour- 
  

   hood 
  of 
  Sudbury, 
  Canada.' 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  xliv. 
  (1888) 
  

   pp. 
  32-44. 
  

  

  Foullon, 
  H. 
  B. 
  von. 
  'Ueber 
  einige 
  Nickelerzvorkommen.' 
  Jahrb. 
  d. 
  k.-k. 
  

   geol. 
  Reichsanstalt. 
  Vienna, 
  1892, 
  pp. 
  223-310. 
  

  

  Garnier, 
  J. 
  ' 
  Mines 
  de 
  Nickel, 
  Cuivre 
  et 
  Platine 
  du 
  Sudbury, 
  Canada.' 
  Mem. 
  

   Soc. 
  des 
  Ing. 
  civils. 
  Paris, 
  1891. 
  

  

  a 
  J. 
  G. 
  S. 
  No. 
  209. 
  f 
  

  

  