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Gold - Coggle Diagram

- - - - higher recovery and makes metallic gold
    - - cyanide to leach out gold
        
        gold dissolves in KCN
        
        gold recovery by settling ponds with zinc
        
        burn residual vapour
  - - - gold leached with cyanide
- - - - lithification to solid rock
        
        fluid flows through rock and remobilises gold
        
        gold concentrated and deposited in channel basin placer deposit
- - - - Often sulphide minerals in metamorphogenic fluid
        
        AuHS
  - - - wall rock alteration
      - fluids react with limestone walls
    - - vapour concentrates minerals and saturates solution so precipitate forms
    - - meteoric water from above mixes with hydrothermal fluids from below
        
        interface changes chemistry causing precipitation
- - - - no oxygen to oxidise these in paleo-placers
      - if they are present it suggests they formed before GOE
  - - - dense so deposited with quartz and pebbles and gravel
      - gold concentrated in gravel deposits
- - - - old stable continents
    - - hydrothermal disseminated
        
        fluids permeate and distribute through host rock
      - hydrothermal vein
        
        igneous intrusions with gold-bearing minerals
        
        faults = pathways vein/mineralisation deposits
      - key words
        
        stockwork
        
        collection of veins
        
        gangue
        
        surrounding rock waste in mining
        
        lode
        
        thick mineral load not individual fractures