# Can acid mine drainage form acid rain?

Can acid mine drainage form acid rain?

Since normal acid rain is formed via combustion of fossil fuels, the sulphur dioxide and nitrogen dioxide are all in the gas phase, whereas in acid mines the sulphuric acid is in solution.

Here's the reaction for acid rock drainage if it helps:

$$\ce{FeS2 + 3.75 O2 + 0.5 H2O → Fe^3+ + 2 SO4^2- + H+}$$

I don't think acid rain formation from liquid acid mine drainage is very likely. The reason is that in acid rock drainage (a.k.a. acid mine drainage or AMD), the acidity is caused by sulfuric acid. Sulfuric acid, $\ce{H2SO4}$ is much less volatile than water. It simply won't appreciably evaporate from bulk liquids at normal conditions on the Earth.