Fort Calhoun Underground Mine
Active
Underground
Stone
Operator: Martin Marietta Materials Inc.
Controller: Martin Marietta Materials Inc
Location: Fort Calhoun, Washington County, NE
Employees: 102
212
Violations
41
S&S Violations
14
Accidents
$140K
Penalties
Recent Violations
View all 212 →| Date | Section | S&S | Negligence | Penalty |
|---|---|---|---|---|
| 01/22/2026 | 57.11051(b) | Non-S&S | ModNegligence | $0 |
| 01/22/2026 | 57.4501 | Non-S&S | ModNegligence | $0 |
| 01/22/2026 | 57.14100(d) | Non-S&S | LowNegligence | $0 |
| 01/21/2026 | 57.12028 | Non-S&S | ModNegligence | $165 |
| 11/04/2025 | 57.4011 | Non-S&S | ModNegligence | $151 |
| 11/04/2025 | 57.12018 | Non-S&S | ModNegligence | $151 |
| 11/04/2025 | 57.14112(b) | Non-S&S | ModNegligence | $151 |
| 10/29/2025 | 57.4460(a)(1) | Non-S&S | ModNegligence | $151 |
| 10/28/2025 | 57.14101(a)(2) | Non-S&S | LowNegligence | $151 |
| 08/27/2025 | 56.4200(b)(2) | Non-S&S | ModNegligence | $151 |
| 08/26/2025 | 57.14209(b) | Non-S&S | ModNegligence | $245 |
| 08/26/2025 | 57.14130(g) | S&S | ModNegligence | $1,219 |
| 08/26/2025 | 48.31(a) | Non-S&S | LowNegligence | $168 |
| 06/11/2025 | 57.18002(b) | Non-S&S | ModNegligence | $193 |
| 06/09/2025 | 57.4201(a)(2) | Non-S&S | HighNegligence | $193 |
| 06/08/2025 | 57.11058 | Non-S&S | LowNegligence | $151 |
| 06/05/2025 | 57.14112(a)(1) | Non-S&S | ModNegligence | $151 |
| 06/03/2025 | 57.4102 | Non-S&S | LowNegligence | $151 |
| 06/02/2025 | 57.14131(b) | Non-S&S | LowNegligence | $313 |
| 06/02/2025 | 57.13021 | Non-S&S | ModNegligence | $697 |
Accidents & Injuries
View all 14 →| Date | Classification | Injury | Days Lost |
|---|---|---|---|
| 09/22/2025 | HANDTOOLS (NONPOWERED) | DAYS AWAY FROM WORK ONLY | 1d lost |
| 07/22/2025 | FALL OF FACE/RIB/PILLAR/SIDE/HIGHWALL | DAYS RESTRICTED ACTIVITY ONLY | 9d restricted |
| 02/24/2025 | SLIP OR FALL OF PERSON | DAYS RESTRICTED ACTIVITY ONLY | 122d restricted |
| 08/05/2024 | SLIP OR FALL OF PERSON | DAYS RESTRICTED ACTIVITY ONLY | 22d restricted |
| 05/21/2024 | INUNDATION | ACCIDENT ONLY | None |
| 04/19/2023 | MACHINERY | DYS AWY FRM WRK & RESTRCTD ACT | 1d lost, 12d restricted |
| 03/05/2023 | FALL OF ROOF OR BACK | ACCIDENT ONLY | None |
| 12/30/2022 | FALL OF ROOF OR BACK | ACCIDENT ONLY | None |
| 09/20/2022 | FALL OF ROOF OR BACK | ACCIDENT ONLY | None |
| 10/30/2021 | OTHER | INJURIES DUE TO NATURAL CAUSES | 11d lost |
Inspections
View all 63 →| Begin | End | Hours | Inspectors |
|---|---|---|---|
| 01/19/2026 | 01/30/2026 | 59.25 | 1 |
| 11/13/2025 | 11/13/2025 | 8.75 | 1 |
| 10/27/2025 | 11/12/2025 | 84.25 | 1 |
| 08/26/2025 | 09/03/2025 | 77.00 | 2 |
| 06/02/2025 | 06/17/2025 | 158.75 | 3 |
| 02/10/2025 | 03/12/2025 | 137.00 | 2 |
| 10/21/2024 | 11/21/2024 | 111.50 | 2 |
| 08/20/2024 | 08/20/2024 | 3.75 | 1 |
| 07/16/2024 | 07/25/2024 | 128.00 | 3 |
| 06/10/2024 | 06/18/2024 | 105.25 | 2 |
Mine Details
MSHA Mine ID2501300
Mine TypeUnderground
StatusActive
CommodityStone
SIC DescriptionCrushed, Broken Limestone NEC
Employees102
Days/Week7.0
Hours/Shift11.0
Coordinates41.4738890, -96.0125000
Nearest TownFort Calhoun
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Frequently Asked Questions
How many MSHA violations does Fort Calhoun Underground Mine have?
Fort Calhoun Underground Mine has 212 MSHA violations on record, of which 41 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $140K.
What type of mine is Fort Calhoun Underground Mine?
Fort Calhoun Underground Mine is a Underground mine producing Stone, located in Fort Calhoun, Washington County, NE. It currently has 102 employees.
Has anyone been injured or killed at Fort Calhoun Underground Mine?
According to MSHA records, Fort Calhoun Underground Mine has 14 reported accident/injury records and 0 fatalities on file.
Who operates Fort Calhoun Underground Mine?
Fort Calhoun Underground Mine is operated by Martin Marietta Materials Inc. and controlled by Martin Marietta Materials Inc. MSHA Mine ID: 2501300.