Geological map of the area around the Delbridge deposit, showing projected location of sulfide lens discovered in 1971 (after O'Dowd, 1990; and Noranda Exploration maps). A sequence of rhyolite flows, breccias and intrusive rhyolite is overlain by mafic debris flows, porphyritic and aphanitic rhyolitic, and andesites. The host stratigraphy at Delbridge probably overlies the Central Mine Sequence.
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