Skip to main content
Conference Proceedings

PACRIM 2004

Conference Proceedings

PACRIM 2004

PDF Add to cart

Disseminated Gold Mineralisation in a Schist-Hosted Mesothermal Deposit, Macraes Mine, Otago, New Zealand

The Macraes mine is producing 175 000 ounces Au/year from a mesothermal deposit with total resource of at least five million ounces. The deposit is hosted in greenschist facies Otago Schist, a widespread Mesozoic metasedimentary sequence that forms the basement of the South Island of New Zealand. Mineralisation was controlled by a late metamorphic shear zone which had both brittle and ductile structures accompanying mineralisation. The shear zone dips shallowly (about 15), subparallel to the shallow-dipping regional foliation, and mineralization occurred during southwesterly-directed thrust motion. Mineralisation occurred under greenschist facies conditions (about 350C) during uplift of the Otago Schist in the late Jurassic. No syn- or late-metamorphic igneous bodies occur within the schist belt. The hosting shear zone is up to 120 m thick, and is traceable for more than 30 km along strike. The shear zone is truncated by an underlying low angle normal fault that juxtaposes mineralised lower greenschist facies rocks on to unmineralised upper greenschist facies rocks.
Return to parent product
  • Disseminated Gold Mineralisation in a Schist-Hosted Mesothermal Deposit, Macraes Mine, Otago, New Zealand
    PDF
    This product is exclusive to Digital library subscription
  • Disseminated Gold Mineralisation in a Schist-Hosted Mesothermal Deposit, Macraes Mine, Otago, New Zealand
    PDF
    Normal price $22.00
    Member price from $0.00
    Add to cart

    Fees above are GST inclusive

PD Hours
Approved activity
  • Published: 2004
  • PDF Size: 5.559 Mb.
  • Unique ID: P200405021

Our site uses cookies

We use these to improve your browser experience. By continuing to use the website you agree to the use of cookies.