Mine waste of the correct kind will indeed absorb CO2. The rightn type can be found as small particles and even nearly dust.
However, some mine dust contains toxic metals, Chrome, Arsenic, lead, copper in acidic form as acid mine drainage.
So what you spread on your crops or pasture or even waste land must be chosen with care.
That said, there is a lot of the right rock to make a difference at only the cost of haulage.
This is exactly what you have to worry about. There are innumerable amounts of spoil tips and gob piles across the world but purifying the waste for use is the real barrier to market leaving it ripe for exploitation by bad science and business practices.
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[ 5.9 ms ] story [ 28.6 ms ] threadhttps://en.wikipedia.org/wiki/Acid_mine_drainage