Data from diamond drilling have demonstrated repetition of certain distinctive rock types (granitic gneiss, amphibolite, bedded iron formation, and so-called Potosi gneiss) formerly thought to occur at only one horizon in the Broken Hill succession. As a result, the structure which contains the lead and zinc lodes, once considered anticlinal, is now interpreted as a drag fold on the steeply dipping eastern limb of a major syncline (the Hanging Wall Basin).

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