Structural Controls to, and Exploration for, Epithermal Au-Ag Deposits
GREG CORBETT
Structural controls to the formation of epithermal Au-Ag deposits within magmatic arc (extending into back arc) environments are apparent as:
• Localisation by major structures,
• Provision of fluid flow paths to enable fluid evolution,
• Dilatant settings of enhanced fluid flow and mineral
deposition,
• Sites of mineral deposition by fluid mixing, locally at
structural intersections.
Structural controls to epithermal Au-Ag mineralisation must be considered as an interaction with other factors such as mineralisation style, host rock characteristics and
mechanisms of precious metal deposition. The path to discovery delineated herein relies on the use of evolving geological models, built up from consideration of many exploration examples (Corbett, 2009), but which should never be treated too rigidly (Lowell, 2012).
Structural controls to the formation of epithermal Au-Ag deposits within magmatic arc (extending into back arc) environments are apparent as:
• Localisation by major structures,
• Provision of fluid flow paths to enable fluid evolution,
• Dilatant settings of enhanced fluid flow and mineral
deposition,
• Sites of mineral deposition by fluid mixing, locally at
structural intersections.
Structural controls to epithermal Au-Ag mineralisation must be considered as an interaction with other factors such as mineralisation style, host rock characteristics and
mechanisms of precious metal deposition. The path to discovery delineated herein relies on the use of evolving geological models, built up from consideration of many exploration examples (Corbett, 2009), but which should never be treated too rigidly (Lowell, 2012).
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