Key Takeaway
Four Corners is a active surface mine producing Nonmetal, located in Mulberry, Polk County, FL. It has 1,676 violations on record (383 S&S) and $1.1M in proposed penalties. Operated by Mosaic Fertilizer, LLC.
Four Corners
Operator: Mosaic Fertilizer, LLC
Controller: Mosaic Company
Location: Mulberry, Polk County, FL
Employees: 500
Recent Violations
View all 1,676 →| Date | Section | S&S | Negligence | Penalty |
|---|---|---|---|---|
| 03/01/2026 | 56.16005 | Non-S&S | ModNegligence | $0 |
| 02/27/2026 | 56.12008 | Non-S&S | ModNegligence | $0 |
| 02/27/2026 | 56.12004 | Non-S&S | LowNegligence | $0 |
| 02/24/2026 | 56.11012 | Non-S&S | ModNegligence | $0 |
| 02/24/2026 | 56.14207 | Non-S&S | ModNegligence | $0 |
| 02/24/2026 | 56.11012 | Non-S&S | ModNegligence | $0 |
| 02/23/2026 | 56.4130(b) | Non-S&S | ModNegligence | $0 |
| 02/22/2026 | 56.18002(a) | Non-S&S | ModNegligence | $0 |
| 02/22/2026 | 56.4203 | Non-S&S | ModNegligence | $0 |
| 02/22/2026 | 56.16012 | S&S | ModNegligence | $0 |
| 02/21/2026 | 56.4102 | Non-S&S | ModNegligence | $0 |
| 02/21/2026 | 56.20003(b) | Non-S&S | ModNegligence | $0 |
| 02/21/2026 | 56.11001 | Non-S&S | ModNegligence | $0 |
| 02/21/2026 | 56.20003(b) | Non-S&S | ModNegligence | $0 |
| 09/02/2025 | 56.14100(c) | Non-S&S | ModNegligence | $151 |
| 08/29/2025 | 56.11001 | S&S | ModNegligence | $1,320 |
| 08/29/2025 | 56.9300(a) | Non-S&S | ModNegligence | $151 |
| 08/28/2025 | 56.4201(a)(2) | Non-S&S | ModNegligence | $151 |
| 08/28/2025 | 56.4200(b)(1) | Non-S&S | ModNegligence | $151 |
| 08/28/2025 | 56.11001 | Non-S&S | ModNegligence | $288 |
Accidents & Injuries
View all 363 →| Date | Classification | Injury | Days Lost |
|---|---|---|---|
| 09/01/2025 | SLIP OR FALL OF PERSON | DAYS AWAY FROM WORK ONLY | None |
| 08/28/2025 | HANDLING OF MATERIALS | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 01/17/2025 | HANDTOOLS (NONPOWERED) | DAYS RESTRICTED ACTIVITY ONLY | 19d restricted |
| 09/28/2024 | POWERED HAULAGE | DAYS RESTRICTED ACTIVITY ONLY | 12d restricted |
| 06/10/2024 | HANDLING OF MATERIALS | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 10/12/2023 | HANDTOOLS (NONPOWERED) | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 09/25/2023 | DISORDERS (REPEATED TRAUMA) | OCCUPATNAL ILLNESS NOT DEG 1-6 | None |
| 07/27/2023 | HANDLING OF MATERIALS | DAYS RESTRICTED ACTIVITY ONLY | 143d restricted |
| 06/29/2023 | HANDLING OF MATERIALS | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 04/18/2023 | MACHINERY | DAYS AWAY FROM WORK ONLY | 48d lost |
Inspections
View all 208 →| Begin | End | Hours | Inspectors |
|---|---|---|---|
| 02/20/2026 | 11.00 | 1 | |
| 01/11/2026 | 01/14/2026 | 42.50 | 1 |
| 12/18/2025 | 01/12/2026 | 12.75 | 1 |
| 09/26/2025 | 09/29/2025 | 5.25 | 1 |
| 08/25/2025 | 09/12/2025 | 243.75 | 5 |
| 08/10/2025 | 08/15/2025 | 54.00 | 1 |
| 05/25/2025 | 05/27/2025 | 35.50 | 1 |
| 04/21/2025 | 04/22/2025 | 3.00 | 1 |
| 03/28/2025 | 04/10/2025 | 3.00 | 1 |
| 03/25/2025 | 03/25/2025 | 4.25 | 1 |
Mine Details
Related Mines
Frequently Asked Questions
How many MSHA violations does Four Corners have?
Four Corners has 1676 MSHA violations on record, of which 383 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $1.1M.
What type of mine is Four Corners?
Four Corners is a Surface mine producing Nonmetal, located in Mulberry, Polk County, FL. It currently has 500 employees.
Has anyone been injured or killed at Four Corners?
According to MSHA records, Four Corners has 363 reported accident/injury records and 0 fatalities on file.
Who operates Four Corners?
Four Corners is operated by Mosaic Fertilizer, LLC and controlled by Mosaic Company. MSHA Mine ID: 0801117.