Why did coal stocks equity share prices dive two days in a row so much?

Question

The Newcastle thermal coal spot price was down by about $US13 (A$13.51) to $US185 a tonne from $US198 a tonne. But this was still above last week's average of $US172 a ton and well above the recent contract price settlement of $US125 a tonne.

Answer 1

Jim Cramer said the price of coal dropped in Europe which caused all coal stocks to drop.