Mexico/mexico300

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The expedition to Lomo de Toro and to Purísima del Cardonal mines was hosted by (right to left) mining engineer Alejandro Contreras, Compañía Fresnillo S.A. de C. V. Unidad El Monte (who furnished the rugged van for the mountainous terrain); mining engineer Rubén Covarubias, Covamin, S. A. de C. V. Alejandro Contreras González; and Oscar Fernando Nieto de la Mora, Gerente [manager] de Unidad Minera, Peñoles Mining Company, Zimapán, Hidalgo, Mexico.