Big Oak Plant
Active
Surface
Nonmetal
Operator: Superior Silica Sands LLC
Controller: PIMCO; HPS Investment Partners; Oak Hill Advisors
Location: San Antonio, Bexar County, TX
Employees: 19
340
Violations
86
S&S Violations
22
Accidents
$273K
Penalties
Recent Violations
View all 340 →| Date | Section | S&S | Negligence | Penalty |
|---|---|---|---|---|
| 11/13/2025 | 56.12008 | Non-S&S | HighNegligence | $549 |
| 11/13/2025 | 46.9(a) | Non-S&S | ModNegligence | $151 |
| 11/13/2025 | 46.3(b)(4) | Non-S&S | ModNegligence | $151 |
| 11/13/2025 | 50.20(a) | Non-S&S | ModNegligence | $151 |
| 11/13/2025 | 56.4200(b)(2) | Non-S&S | ModNegligence | $151 |
| 11/13/2025 | 56.4201(a)(3) | Non-S&S | ModNegligence | $151 |
| 11/13/2025 | 56.14100(b) | Non-S&S | ModNegligence | $165 |
| 11/12/2025 | 56.14207 | Non-S&S | ModNegligence | $151 |
| 11/12/2025 | 46.11(b)(6) | S&S | ModNegligence | $818 |
| 11/12/2025 | 56.4201(a)(1) | Non-S&S | ModNegligence | $151 |
| 11/12/2025 | 56.12018 | Non-S&S | ModNegligence | $151 |
| 11/12/2025 | 56.14207 | Non-S&S | LowNegligence | $151 |
| 11/12/2025 | 56.20003(a) | Non-S&S | ModNegligence | $151 |
| 11/12/2025 | 56.12018 | Non-S&S | ModNegligence | $151 |
| 11/12/2025 | 56.12028 | Non-S&S | ModNegligence | $151 |
| 11/12/2025 | 56.11003 | Non-S&S | ModNegligence | $151 |
| 11/12/2025 | 56.12032 | Non-S&S | ModNegligence | $151 |
| 11/12/2025 | 56.14107(a) | Non-S&S | ModNegligence | $151 |
| 11/12/2025 | 56.4200(b)(2) | Non-S&S | ModNegligence | $151 |
| 11/12/2025 | 56.11003 | Non-S&S | ModNegligence | $151 |
Accidents & Injuries
View all 22 →| Date | Classification | Injury | Days Lost |
|---|---|---|---|
| 06/04/2025 | HANDLING OF MATERIALS | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 01/13/2024 | SLIP OR FALL OF PERSON | DAYS RESTRICTED ACTIVITY ONLY | 10d restricted |
| 08/05/2023 | SLIP OR FALL OF PERSON | FATALITY | Fatal |
| 05/25/2022 | OTHER | INJURIES INVOLVNG NONEMPLOYEES | None |
| 05/14/2022 | MACHINERY | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 04/21/2022 | MACHINERY | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 02/17/2022 | SLIP OR FALL OF PERSON | DAYS RESTRICTED ACTIVITY ONLY | 2d restricted |
| 11/23/2021 | HANDLING OF MATERIALS | PERM TOT OR PERM PRTL DISABLTY | None |
| 11/06/2021 | OTHER | DAYS RESTRICTED ACTIVITY ONLY | 6d restricted |
| 01/25/2021 | HANDTOOLS (NONPOWERED) | DAYS RESTRICTED ACTIVITY ONLY | 22d restricted |
Inspections
View all 102 →| Begin | End | Hours | Inspectors |
|---|---|---|---|
| 02/06/2026 | 02/06/2026 | 12.50 | 1 |
| 11/24/2025 | 11/24/2025 | 6.25 | 1 |
| 11/10/2025 | 11/17/2025 | 52.75 | 2 |
| 07/30/2025 | 07/31/2025 | 25.50 | 1 |
| 02/18/2025 | 02/20/2025 | 4.25 | 1 |
| 12/30/2024 | 01/06/2025 | 25.50 | 1 |
| 09/24/2024 | 09/24/2024 | 0.00 | 0 |
| 05/03/2024 | 05/06/2024 | 33.75 | 1 |
| 01/02/2024 | 01/08/2024 | 11.00 | 1 |
| 12/17/2023 | 12/21/2023 | 87.75 | 3 |
Mine Details
MSHA Mine ID4101126
Mine TypeSurface
StatusActive
CommodityNonmetal
SIC DescriptionSand, Industrial NEC
Employees19
Days/Week5.0
Hours/Shift8.0
Coordinates29.2430560, -98.4986110
Nearest TownSan Antonio
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Frequently Asked Questions
How many MSHA violations does Big Oak Plant have?
Big Oak Plant has 340 MSHA violations on record, of which 86 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $273K.
What type of mine is Big Oak Plant?
Big Oak Plant is a Surface mine producing Nonmetal, located in San Antonio, Bexar County, TX. It currently has 19 employees.
Has anyone been injured or killed at Big Oak Plant?
According to MSHA records, Big Oak Plant has 22 reported accident/injury records and 2 fatalities on file.
Who operates Big Oak Plant?
Big Oak Plant is operated by Superior Silica Sands LLC and controlled by PIMCO; HPS Investment Partners; Oak Hill Advisors. MSHA Mine ID: 4101126.