Gold (silver) mine. Epithermal quartz vein system.
Martha Hill mine (Southern Hauraki goldfield).
Complex quartz vein field with braided quartz veins in hydrothermally altered Late Miocene andesites and dacites.
Three alteration zones are present :
- Smectite, chlorite, calcite, pyrite
- Interstratified illite/smectite
- Illite, adularia, quartz
Refs.:
Dana 6: 48.
http://www.marthamine.co.nz/mine_overview.html
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Map Reference: 37°25'S , 175°43'E
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