Rosario Mining Company
History 1880. The President of Honduras, Marco Aurelio Soto, offered companies that invested in the mine in San Juancinto a 20year exemption from all 1880, Julius Valentine, of New York City founded the New York and Honduras Rosario Mining Company, exchanging 50% of the Company's stock for the mining rights of the El Rosario deposits at San Juancito which were owned by Soto.