 From these limited resources, Reininger built Rosario into a powerful and diversified mining and oil company, with interests stretching out to North America, South America, and the North Sea.Under Reininger's leadership, El Mochito, with its rich ore and spectacular wire silver, soon became Central America's largest precious and base metals producer.Out of El Mochito's profits, Rosario made successful investments in new projects in the United States, Canada, Mexico, Peru, Nicaragua, and the Dominican Republic, as well as major Canadian gas discovery in 1969 and 1970s oil play in the British North Sea.