(b) Each specific operational status is defined as follows:

1. (1) Underground mine:

   1. (i) Producing—has at least one mechanized mining unit producing material.
   2. (ii) Nonproducing—no material is being produced.
   3. (iii) Abandoned—the work of all miners has been terminated and production activity has ceased.

2. (2) Surface mine:

   1. (i) Producing—normal activity is occurring and coal is being produced or processed or other material or equipment is being handled or moved.
   2. (ii) Nonproducing—normal activity is not occurring and coal is not being produced or processed, and other material or equipment is not being handled or moved.
   3. (iii) Abandoned—the work of all miners has been terminated and all activity has ceased.

3. (3) DWP:

   1. (i) Producing—normal activity is occurring.
   2. (ii) Nonproducing—normal activity is not occurring.
   3. (iii) Abandoned—the dust generating source has been withdrawn and activity has ceased.