Porco caldera
... that the Porco caldera in Bolivia, a major source of silver for the Inca, is now Bolivia's largest zinc mine?
... that the <b id="mwCA4"><a href="./Porco_(caldera)" id="mwCA8" rel="mw:WikiLink" title="Porco (caldera)">Porco caldera</a></b> in Bolivia, a major source of <a href="./Silver" id="mwCBA" rel="mw:WikiLink" title="Silver">silver</a> for the <a href="./Inca_society" id="mwCBE" rel="mw:WikiLink" title="Inca society">Inca</a>, is now Bolivia's largest <a href="./Zinc" id="mwCBI" rel="mw:WikiLink" title="Zinc">zinc</a> mine?