 The industrial complex was delivered 18 months late, and the budget went off limit by $750 million.In 2017, the output of the site was much lower then predicted, which led the company to lower its future production expectations.The ore (mineralization) occurs in a strata bound form known as mantos in El Boleo Formation which is a range of clastic sedimentary rocks from siltstone to sandstones, with some claystone.