Immobile element plot (Al2O3 versus Zr) showing that most of the volcanic rock the Ansil deposit form a bimodal suite of basasltic andesite and andesite on the one hand, and rhyolite on the other. The fans of samples shown in yellow represent rocks affected by mass gains or mass losses during alteration. The solid line is the estimated fractionation trend for the Central Mine Sequence in this area. Mass changes calculated from these relations show large net mass losses and also gains in the footwall, and commonly gains in the hangingwall; these effects extend at least 50 metres on either side of the sulfide lens.





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