Crossword puzzle clue "underground coal sources"

Here are the possible solutions for underground coal sources clue

Answer
Clue
Relevancy
mines
Clue
Underground coal sources
Sources of coal
Definition
MINE, to dig for valuable materials
mine
Clue
Underground coal source
Underground source for coal
Definition
to dig for valuable materials
aquifers
Clue
Underground water sources
Definition
AQUIFER, an underground reservoir of water which can be extracted for surface use, also AQUAFER
ores
Clue
Underground sources of income
Definition
ORE, rock containing a valuable metal, also OWRE
wellillustrated
Clue
" 'A Pictorial History of Underground Water Sources' is ..."
wells
Clue
Underground water sources

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