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Gold - Coggle Diagram

- - - - old hard lithified
- - - - makes metallic gold
      - high recovery
  - - - by oxidising sulphides
      - no toxic materials
  - - - mercury boiled off in acid
      - mercury poisonous
      - good when no sulphides or arsenic
- - - - vapour concentrates minerals and saturates solution
    - - mixing of hydrothermal fluids from depth with ones from above creates change in oxidation state creating deposition
    - - rock wall alteration
        
        limestone more reactive than sandstone
        
        fluid reacts with rock wall causing precipitation
- - - - low reactivity at low temp, reactivity increases with temperature
      - siderophile - where iron is present