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El Oro, Mexico

History

Mining

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
1900
    Dos Estrellas Mining Co drives adit and discovers Veta Verde
1929
    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

Exploration

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