Gold

 

Gold

Coarse gold yielded form reef and colluvial deposits in Central Queensland.

Set out to answer the five questions thought to be important in the formation of large-scale gold deposits:


1. What is the role of geodynamics (stratigraphy, structural, metallogenic, and metamorphic history)?

2. What structural architecture is required?

3. How is metal transported and deposited?

4. What and where are the fluid sources and reservoirs?

5. What are the fluid flow drivers and pathways?

Queensland Gold

The third-largest gold producing state in Australia is Queensland with over 950 tonnes total gold resources and reserves. Total gold production since the early gold rushes of the late 19th-century documented to be over 7000 tonnes. Current gold producers of most significance are Cracow, Ernest Henry, Mount Rawson, Pagingo and Ravenswood.


A diverse range of geological provinces and deposit styles contained gold mineralisation occurrences, ranging from a historically important large alluvial goldfields of the northern Queensland to the Proterozoic iron oxide-copper-Gold deposits off the Mount Isa orogen. Queensland's main gold mineralisation styles include:


  1. Bulletalluvial deposits,

  2. Bulletvolcanic-hosted massive sulfide,

  3. Bulletshear zone hosted hydrothermal and skarns,

  4. Bulletmesothermal Au–quartz veins,

  5. Bulletporphyry-related breccias,

  6. Bulletepithermal deposits,

  7. BulletProterozoic iron oxide–Cu–Au.

    Described in Preview (Aug 2008) p28-30:


Queensland Mines and Energy provides a history of gold, snippet below (reload button to view different snippets).