Topographical and Physical Conditions. Dangers From Excessive Water, Collapses, Poisonous Gases, Etc.

10. Assured.
Every facility for mining at a minimum cost unusual security against dangers.

9. Superior.
Facilities for mining at a low cost. No dangerous conditions indicated.

8. Very good.
No special difficulty or impediment in mining. The ordinary dangers only.

7. Good.
Slight difficulties to overcome and consequent dangers a little above the average.

6. Fair.
Engineering difficulties and dangers beyond the average, but not at all unsurmountable.

5. Passable.
Special engineering to overcome difficulties and danger before deposits are available.

4. Poor.
Available if special engineering overcomes difficulties and dangers. Results somewhat doubtful.

3. Very poor.
Probably available if special engineering overcomes difficulties and dangers. Results doubtful.

2. Bad.
Questionably available provided special engineering overcomes difficulties and dangers. Chances against successful engineering.

1. Very bad.
Possibly available if special engineering overcomes difficulties and dangers, but these so formidable that results are very doubtful.

0. Outclassed.
Engineering dangers, and difficulties which demonstrably could not be overcome.