Crossword puzzle clue "mining matter"

Here are the possible solutions for mining matter clue

Answer
Clue
Relevancy
ore
Clue
Mining matter
Definition
rock containing a valuable metal, also OWRE
age
Clue
"___ is an issue of mind over matter.If you don't mind, it doesn't matter." (Mark Twain)
Definition
to grow old
idea
Clue
Matter for the gray matter
Gray matter matter?
Gray matter matter
Definition
a conception or a plan
makeamentalnote
Clue
Put some matter in the gray matter?
adit
Clue
Mining passage
Definition
a nearly horizontal shaft to the surface in a mine
alcoa
Clue
Mining-manufacturing giant based in Pittsburgh

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