1869: Old Carbon No. 3 and No. 4: Union Pacific Coal Company's
No. 3 and No. 4 Mines in Old Carbon, Wyoming
Exhibit by Bob Leathers
- The Union Pacific Coal Company's Old Carbon No. 3 and No. 4 underground mines were 1869 test mines. The only coal produced was an amount sufficient to locate and prove the coal seam. No fatalities were found in the No. 3 or No, 4 mines.