When a Coal Mine is built and some but not all coal cubes are moved to the Market, can the remaining cubes be moved in a later turn, or is this only done immediately upon building?
inferred
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Official Answer
The remaining coal cubes cannot be moved to the Market in a later turn. Coal and iron cubes may only be sold to their Markets during the action when their Industry tile is built. They are never sold to their Markets in later turns.
This is stated on page 9:
"Note: Coal and iron cubes may only be sold to their Markets during the action when their Industry tile is built. They are never sold to their Markets in later turns."
Therefore, any coal cubes left on the Coal Mine after the build action remain there until consumed by players building other tiles that require coal.
Source: page 9.
Source: Core Rulebook (pp. 10, 6, 8, 9)