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The Cerro Blanco project resource is from a typical hot spring-style epithermal, low-sulfidation or quartz-adularia-type, vein deposit. The vein system is within Tertiary volcaniclastic sediments, andesitic and dacitic welded tuff rocks and, to a lesser extent, in Cretaceous limestone and fine to coarse siliceous to argillaceous clastic sediments. The stockwork vein system extends in a northwest trend for three kilometers before reaching post-mineral basalt cover. A sinter and silica replacement blanket is underlain by basin-fill volcaniclastic rocks including re-worked Cretaceous sediments and is underlain at depth by a thick, pervasively chloritized, dacitic welded tuff. Stockwork quartz/calcite veining is pervasive in the permeable volcaniclastic sequence and forms more discrete but generally higher-grade veins near and in the dacite. The deposit at Cerro Blanco has been defined over a strike length of one kilometer and is open at depth, to the north and south.
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