Tacora
... that Tacora , Chile's northernmost volcano, was the site of substantial sulfur mining operations that were explicitly given to Chile in a 1929 treaty with Peru?
... that <b id="mwBVI"><a href="./Tacora" id="mwBVM" rel="mw:WikiLink" title="Tacora">Tacora</a></b> <i id="mwBVQ">(pictured)</i>, Chile's northernmost <a href="./List_of_volcanoes_in_Chile" id="mwBVU" rel="mw:WikiLink" title="List of volcanoes in Chile">volcano</a>, was the site of substantial <a href="./Sulfur" id="mwBVY" rel="mw:WikiLink" title="Sulfur">sulfur</a> mining operations that were explicitly given to Chile in a <a href="./Treaty_of_Lima_(1929)" id="mwBVc" rel="mw:WikiLink" title="Treaty of Lima (1929)">1929 treaty</a> with Peru?