﻿Fig. 
  18 
  Plan 
  of 
  main 
  workings, 
  Lyon 
  Mountain 
  

   )ur 
  lines 
  are 
  based 
  on 
  sea 
  level. 
  . 
  After 
  a 
  map 
  by 
  N. 
  

  

  Hansell 
  and 
  H. 
  H. 
  Hindshaw 
  

  

  