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Coahuila on the northeast, Sonora on the northwest, and Oaxaca on the south-southeast. In the Coahuila region, bituminous coking coals are present in Upper Cretaceous rocks. The Sonora region contains deposits of Upper Triassic anthracitic coal, altered by probable thermal metamorphism. The Oaxaca region contains anthracitic and some bituminous coking coal in Lower(?) to Middle Jurassic sequences.

Through 1973, only the coal deposits of the Coahuila region had been developed commercially. The coals of the Sonora and Oaxaca regions are undeveloped because of unfavorable geo-economic conditions and...

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