To dream of mining represents a mindset that is scouting or prospecting for resources that can be used.
Negatively, mining may reflect desperation to keep finding resources to use to maintain a situation.
Example: A man dreamed of going down a mine-shaft at a scary speed to do a mining job. In waking life he was financially broke and keep looking for personal property he could sell to stay financially stable. He had to keep selling collectible coins a lot sooner than he wanted to.