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El Oro, Mexico



1529 First records of mining was by Spanish in the Borda Coronas Area
1700s Cornish Tin miners arrive in El Oro and restart mining of the Spanish discoveries
1880s - 1929 El Oro Bonanza Mining Period: El Oro Mining, Esperanza Mining, Mexican Mining discover and mine the San Rafael Vein & others
    Dos Estrellas Mining Co drives adit and discovers Veta Verde
    San Rafael mine floods and production stopped
1929 - 1938 Dos Estrellas Mining Co. continues to mine Veta Verde, bankrupt in 1938 following a tailings dam slide
1938 - 1959 Mexican government hands over the district to the Workers Cooperative. Mining of backfill and pillars continued until 1959 on an ad hoc basis with processing plant located in Borda /Coronas area. Production appears to be minimal but no records exist


1969 - 1971 More Mines Limited; Drilling Total: 2 holes, 513m - no results kept
1983 - 1990 Luismin drilled the surrounding areas for new veins 33 drill holes / 7064m completed with the Buen Despacho, Zona Oriente. Cortaduras, San Francisco de Reyes, Pomoca targets tested
1993 Hillsborough - San Rafael remnant resource definition drilling
Total of 12 drill holes / 3008m
1996 - 1997 Teck - IP Geophysical Survey and Geochemical Surface Sampling Program - Veta San Rafael & Verde, Zona Oriente
Drilling of IP targets mostly identified dykes not veins: 13 drill holes, 3069 m - Veta Verde, Zona Oriente, Cortaduras targets tested
2003 - 2004 Placer Dome - San Rafael Vein Drilling
Total: 11 drill holes, 5021m
Geochemical Surface Sampling Program Oriente
2007 Minera CCM S.A. de C.V. (Candente) Geophysical Program: Resistivity NASTM
Regional Geochemical sampling
Drilled 4096m in 11 holes underneath old mine workings in four veins: 8 holes hit targets and 7 mineralized structures intersected