﻿1864.] 
  SEELEY 
  HUNSTANTON 
  BED 
  ROCK. 
  327 
  

  

  developed, 
  consists 
  of 
  a 
  mixture 
  of 
  crystalline 
  quartz 
  in 
  aggregations 
  

   and 
  irregular 
  seams, 
  with 
  a 
  soft 
  mass 
  rich 
  in 
  free 
  silver 
  and 
  gold. 
  

   The 
  ore 
  corresponds 
  to 
  that 
  called 
  Colorado 
  in 
  Mexico. 
  

  

  In 
  width, 
  the 
  lode 
  varies 
  from 
  12 
  to 
  40 
  feet. 
  In 
  some 
  speci- 
  

   mens 
  of 
  the 
  ore, 
  free 
  gold 
  in 
  fine 
  grains 
  is 
  very 
  thickly 
  implanted 
  

   over 
  a 
  rough 
  surface 
  of 
  quartz 
  stained 
  with 
  iron-rust 
  ; 
  in 
  others, 
  

   the 
  native 
  silver 
  forms 
  a 
  light 
  bronze 
  -like 
  powder 
  in 
  cavities 
  of 
  the 
  

   quartz. 
  Chloride 
  of 
  silver 
  is 
  reported, 
  but 
  no 
  distinct 
  specimens 
  

   came 
  under 
  my 
  notice. 
  

  

  3. 
  Daney 
  Lode. 
  — 
  About 
  five 
  miles 
  south 
  of 
  Silver 
  City, 
  and 
  a 
  mile 
  

   south 
  of 
  the 
  overland-mail 
  route, 
  the 
  outcrop 
  of 
  a 
  quartz-vein 
  was 
  

   discovered 
  by 
  Mr. 
  Daney 
  inl860 
  and 
  1861, 
  and 
  has 
  been 
  shown 
  to 
  be 
  

   very 
  rich 
  and 
  promising. 
  The 
  outcrop 
  is 
  on 
  the 
  slope 
  of 
  a 
  low 
  porphy- 
  

   ritic 
  hill 
  rising 
  above 
  the 
  general 
  level 
  of 
  the 
  plains 
  of 
  Canon 
  Valley. 
  

  

  Shafts 
  sunk 
  proved 
  that 
  the 
  vein 
  was 
  very 
  regular, 
  with 
  a 
  width 
  

   of 
  12 
  to 
  13 
  feet, 
  and 
  an 
  inclination 
  north-easterly, 
  its 
  course 
  being 
  

   65° 
  N. 
  to 
  80° 
  W. 
  The 
  walls 
  are 
  regular, 
  and 
  consist 
  of 
  a 
  compact 
  

   felspathic 
  porphyry 
  of 
  a 
  dark-green 
  colour 
  below, 
  and 
  drab 
  or 
  

   yellowish 
  at 
  the 
  outcrop. 
  The 
  vein-stone 
  is 
  quartz, 
  and 
  breaks 
  out 
  

   in 
  hard 
  rounded 
  masses, 
  looking 
  like 
  ordinary 
  boulders, 
  while 
  

   between 
  them 
  the 
  vein 
  is 
  soft, 
  and 
  the 
  whole 
  is 
  much 
  stained 
  

   by 
  the 
  decomposition 
  of 
  a 
  pyrites 
  which 
  is 
  abundant, 
  and 
  seems 
  to 
  

   have 
  softened 
  the 
  ore. 
  The 
  hard 
  masses, 
  when 
  broken 
  up, 
  show 
  a 
  

   breccia 
  of 
  very 
  small 
  fragments, 
  but 
  thoroughly 
  cemented, 
  so 
  as 
  to 
  

   be 
  very 
  hard 
  and 
  unyielding, 
  yet 
  full 
  of 
  small 
  angular 
  cavities 
  

   lined 
  with 
  minute 
  quartz 
  crystals, 
  and 
  in 
  those 
  parts 
  least 
  affected 
  

   by 
  decomposition 
  with 
  pyrites. 
  This 
  pyrites 
  appears 
  to 
  be 
  rich 
  in 
  

   gold, 
  and 
  this 
  metal 
  is 
  plainly 
  seen 
  in 
  a 
  large 
  portion 
  of 
  the 
  rusted 
  

   ore. 
  In 
  one 
  of 
  these 
  hard 
  masses 
  of 
  quartz, 
  taken 
  to 
  San 
  Francisco 
  

   early 
  in 
  1861, 
  I 
  found 
  isolated 
  grains 
  and 
  patches 
  of 
  dark-red 
  

   silver 
  ore, 
  or 
  ruby 
  silver, 
  dispersed 
  throughout 
  the 
  brecciated 
  mass, 
  

   giving 
  it 
  a 
  greyish 
  colour. 
  The 
  same 
  was 
  afterwards 
  found 
  abun- 
  

   dantly 
  at 
  the 
  mine, 
  besides 
  some 
  small 
  crystals 
  of 
  silver 
  glance 
  

   (sulphuret 
  of 
  silver), 
  and 
  threads 
  of 
  white 
  native 
  silver, 
  together 
  

   with 
  native 
  gold. 
  The 
  gold 
  contains 
  a 
  large 
  portion 
  of 
  silver, 
  and 
  

   is 
  in 
  granular 
  masses 
  adhering 
  to 
  and 
  penetrating 
  the 
  quartz. 
  It 
  

   is 
  most 
  abundant 
  in 
  the 
  soft 
  clayey 
  ore, 
  which 
  is, 
  moreover, 
  the 
  

   most 
  available 
  for 
  working. 
  

  

  2. 
  On 
  the 
  Hunstanton 
  Red 
  Rock. 
  By 
  Harry 
  Seeley, 
  Esq., 
  F.G.S., 
  

   of 
  the 
  Woodwardian 
  Museum, 
  Cambridge. 
  

  

  [Abstract.] 
  

  

  In 
  the 
  'Annals 
  of 
  Natural 
  History 
  ' 
  for 
  April 
  1861*, 
  the 
  author 
  dis- 
  

   cussed 
  what 
  others 
  had 
  written 
  on 
  the 
  age 
  of 
  the 
  Red 
  Rock, 
  and 
  in 
  

   this 
  paper 
  he 
  gave 
  such 
  account 
  of 
  the 
  bed, 
  where 
  seen 
  in 
  the 
  Hun- 
  

   s'ton 
  section, 
  as 
  subsequent 
  observation 
  had 
  enabled 
  him 
  to 
  prepare 
  f. 
  

  

  * 
  3rd 
  ser. 
  vol. 
  vii. 
  p. 
  233. 
  

  

  t 
  The 
  notes 
  and 
  sections 
  for 
  this 
  paper 
  were 
  made 
  in 
  March 
  1863. 
  

  

  