Lead-zinc orebodies. Broken Hill, New South Wales, Australia

Major Minerals:

Galena, sphalerite

Minor Minerals:

Chalcopyrite, hexagonal and monoclinic pyrrhotite, pyrite, arsenopyrite, lollingite, gahnite, tetrahedrite

Trace Minerals:

Include troilite, valleriite, molybdenite, stannite, ilmenite, haematite, boulangerite, marcasite, dyscrasite, pyrargyrite, polybasite, stephanite, cubanite, bournonite, cobaltite, niccolite, breithauptite, gudmundite, native gold, native antimony, native silver, wolframite, scheelite, bornite


Both prograde and retrograde metamorphic textures are present. Prograde regional metamorphism of the ores has resulted in sieve-like textures between the major sulphides and gangue minerals-where each mineral can occur as inclusions within the others. Primary hexagonal pyrrhotite has exsolved troilite lamellae within it. Secondary monoclinic pyrrhotite about grain boundaries and along fractures of relict hexagonal pyrrhotite has formed during retrograde metamorphism. Pyrrhotite alters to pyrite and marcasite. Argentian tetrahedrite occurs as inclusions within galena or is present at grain boundaries of galena and sphalerite. Tetrahedrite alters to intergrowths of gudmundite, chalcopyrite, sphalerite, lollingite, secondary tetrahedrite, argentite, pyrargyrite, polybasite and stephanite due to retrograde metamorphism


Markham and Lawrence, 1962; Lawrence, 1968, 1973; Both and Rutland, 1976; Scott et al., 1977; Both and Stumpfl, 1987