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Country rock
"Country rock" in a Sentence (2 examples)
It is commonly said of manganese ores that in their occurrence they are generally of a pockety nature, by which it is meant that the ores are found in limited masses surrounded by unproductive country rock, as opposed to the usual occurrence of other minerals in veins […]
After driving, and opening the reef for some distance, it turned under, and completely pinched out in country rock.
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