Crossword puzzle clue "coal sources"

Here are the possible solutions for coal sources clue

Answer
Clue
Relevancy
mines
Clue
Underground coal sources
Sources of coal
Definition
MINE, to dig for valuable materials
seams
Clue
Coal sources
stripmines
Clue
Eco-unfriendly coal sources
acetylene
Clue
Gas made from limestone and coal
Definition
a colourless toxic inflammable gas formed by the action of water on calcium carbide, aka ethyne
albia
Clue
Iowa coal center
Coal city in Iowa
allfuelsday
Clue
When coal, gas and oil are delivered?

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