CHICAGO & MONTERREY, Mexico--(BUSINESS WIRE)--Fitch Ratings has downgraded the long-term foreign and local currency Issuer Default Ratings (IDRs) of Cobre del Mayo S.A. de C.V. (CdM) to 'CCC' from 'B', and the rating for its senior unsecured 10.75% notes due 2018 to 'CCC/RR4' from 'B/RR4'. CdM's national rating has also been downgraded to 'CCC(mex)' from 'BBB-(mex)'. KEY RATING DRIVERS Elevated Unit Costs: CdM encountered a number of operational issues since the second half of 2014 that have lo
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