Abstract

The gold-copper ore of the Orlando mine, Northern Territory, is a pipelike deposit that follows a shear zone within a gravity slide. Lithologic and structural units within the gravity slide reflect different degrees of fluidity and fragmentation, which depended, in turn, on grain size and depth of burial at the time of sliding. Structural features include flowage folds, rafted blocks, breccias, and pelletoid conglomerates. Minerals associated with the ore body include chlorite, magnetite, chalcopyrite, pyrite, bismuthinite, and gold. Other mineralized zones are characterized by talc, magnetite, carbonate, and galena-sphalerite.

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