www.maptek.com CASE STUDY Francisco I. Madero deposit is located in Zacatecas state, Mexico. Peñoles geologists, Angel Castro and Leopoldo González, studied the uncertainty in the zinc grades. The two main objectives were to: • assess the uncertainty in the Zn grades in the main ore rock and produce a model that could be used later to evaluate the economic risks in the reserves, and • establish a methodology for future studies of miner

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