Abstract:In the vicinity of the Broken Hills mine, flow-banded rhyolites are overlain by silicified rhyolite pyroclastics composed of fine to coarse pyroclastic-flow lapilli sheets and airfall ash and lapilli. Within the Broken Hills mine, epithermal subvolcanic gold-silver-selenium-arsenic mineralisation occurs in both fissure veins and in several breccia pipes. The grain size of the mineralisation is typically 50/Lm or less. Some of the gold and silver is inferred to occur either as a solid solution with pyrite, or a… Show more
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