| Mine Name and YSU Mine Number | URMSON | MAHO000020 |
| Townships | Smith | ... | ... | Quadrangle 001 | Alliance Quad |
| Lots | SEC. 23 (SW 1/4) | Quadrangle 002 | ... |
| County, State | Mahoning | OH | UTM | 17 465,000 2,412,700 |
| DOM Map Number | MG-19 | Seam Elevation | 1130' |
| OGS Mine Number | Seam Thickness |
| USBM Document Number | 321560 | Cover Thickness | 30' MAX |
| Mine Type and Commodity Mined | DRIFT | COAL | Drain Level | ABOVE |
| Seam Code 001 | MIDDLE KITTANNING, GREAT VEIN | Hazard Potential | LOW |
| Seam Code 002 | Seam Information Unavailable | Mapped | Yes |
| Date Opened | 1888 | Date Closed | 1902 | Located | Yes |
| Operator 001 | RALPH URMSON | Operator 001 Date Opened | 1891 |
| Operator 001 Date Closed | 1900 |
| Operator 002 | RALPH URMSON | Operator 002 Date Opened | 1891 |
| Operator 002 Date Closed | 1900 |
| Operator 003 | ... | Operator 003 Date Opened |
| Operator 003 Date Closed |
| Operator 004 | ... | Operator 004 Date Opened |
| Operator 004 Date Closed |
| Operator 005 | ... | Operator 005 Date Opened |
| Operator 005 Date Closed |
| Operator 006 | ... | Operator 006 Date Opened |
| Operator 006 Date Closed |
| Operator 007 | ... | Operator 007 Date Opened |
| Operator 007 Date Closed |
| Operator 008 | ... | Operator 008 Date Opened |
| Operator 008 Date Closed |
| Remarks | Mine map [1] shows: 1 air and pumping shaft. Coal identified by elevation. |
| Last Update: | Wednesday, February 17, 1999 |