Ann:, page-7

https://www.smedg.org.au/mines-and-wines-2015-files/papers/Bulletin%20M&W%202015%20v1_22.pdf

Snippets:

A previous exploration case study for Thursdays Gossan (Rajagopalan 1999) has characterised a 1 kilometre diameter geophysical footprint for this porphyry. First is a magnetic anomaly of high and lows (due to magnetite creation and destruction associated with the alteration zones). Second is a gravity low (interpreted as enhanced weathering facilitated by acid sulphate groundwater propagating down the fractures into already altered rocks). Last is an electrically conductive anomaly (interpreted as due to saline groundwater in the deep weathering profile but also because of the sulphides?). The existing regional precompetitive aeromagnetic data has 200-400 m line spacing across the Stavely region so that sampling density is sufficient to reveal many magnetic anomalies with a kilometre-size footprint.