Try sending someone into a coal mine wearing a cloth mask, your company will be sued out of existence. What do you think is bigger, coal particles or virus particles?
What is your point?
Osha doesnt cover coal mines.
You will never see OSHA at a coal mine.
Fit tested half face respirator at the very least.
Who regulates them safety wise then? Even nuke plants have osha rules
And the rules with MSHA are slightly different than OSHA.