Clark Operations
Active
Surface
Nonmetal
Operator: U.S. Silica Company, LLC
Controller: USS Holdings Inc
Location: SPARKS, Storey County, NV
Employees: 62
404
Violations
109
S&S Violations
37
Accidents
$240K
Penalties
Recent Violations
View all 404 →| Date | Section | S&S | Negligence | Penalty |
|---|---|---|---|---|
| 01/27/2026 | 56.14112(a)(1) | Non-S&S | ModNegligence | $0 |
| 01/27/2026 | 50.30(a) | Non-S&S | LowNegligence | $0 |
| 01/27/2026 | 50.30(a) | Non-S&S | LowNegligence | $0 |
| 01/27/2026 | 50.30(a) | Non-S&S | LowNegligence | $0 |
| 01/27/2026 | 50.30(a) | Non-S&S | LowNegligence | $0 |
| 01/26/2026 | 56.11001 | Non-S&S | LowNegligence | $0 |
| 01/26/2026 | 56.14100(b) | Non-S&S | ModNegligence | $0 |
| 01/26/2026 | 56.12028 | Non-S&S | ModNegligence | $0 |
| 01/26/2026 | 56.23003(b) | Non-S&S | LowNegligence | $0 |
| 01/26/2026 | 56.12068 | S&S | ModNegligence | $0 |
| 01/26/2026 | 56.12016 | S&S | ModNegligence | $0 |
| 08/28/2025 | 56.20003(b) | Non-S&S | LowNegligence | $151 |
| 02/21/2025 | 56.14115(b) | Non-S&S | ModNegligence | $366 |
| 02/21/2025 | 56.12004 | Non-S&S | ModNegligence | $366 |
| 02/21/2025 | 56.14107(a) | Non-S&S | ModNegligence | $366 |
| 02/14/2024 | 48.27(a) | S&S | ModNegligence | $339 |
| 02/13/2024 | 56.12004 | Non-S&S | LowNegligence | $147 |
| 02/13/2024 | 56.12004 | Non-S&S | LowNegligence | $147 |
| 02/13/2024 | 56.14107(a) | S&S | LowNegligence | $147 |
| 02/13/2024 | 56.13011 | Non-S&S | LowNegligence | $147 |
Accidents & Injuries
View all 37 →| Date | Classification | Injury | Days Lost |
|---|---|---|---|
| 11/15/2024 | SLIP OR FALL OF PERSON | DAYS AWAY FROM WORK ONLY | 151d lost |
| 09/22/2024 | POWERED HAULAGE | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 10/02/2023 | HANDTOOLS (NONPOWERED) | DAYS AWAY FROM WORK ONLY | 183d lost |
| 03/11/2022 | HANDLING OF MATERIALS | DAYS RESTRICTED ACTIVITY ONLY | 4d restricted |
| 03/08/2022 | HANDLING OF MATERIALS | DAYS RESTRICTED ACTIVITY ONLY | 30d restricted |
| 11/02/2020 | HANDTOOLS (NONPOWERED) | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 10/21/2020 | MACHINERY | DAYS RESTRICTED ACTIVITY ONLY | 255d restricted |
| 11/23/2018 | HANDTOOLS (NONPOWERED) | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 09/20/2018 | HANDLING OF MATERIALS | DAYS RESTRICTED ACTIVITY ONLY | 18d restricted |
| 09/08/2018 | HANDLING OF MATERIALS | DAYS RESTRICTED ACTIVITY ONLY | 3d restricted |
Inspections
View all 83 →| Begin | End | Hours | Inspectors |
|---|---|---|---|
| 01/25/2026 | 01/28/2026 | 35.25 | 1 |
| 08/28/2025 | 09/04/2025 | 22.50 | 1 |
| 04/23/2025 | 04/23/2025 | 9.00 | 1 |
| 02/21/2025 | 02/21/2025 | 8.00 | 1 |
| 06/24/2024 | 06/25/2024 | 16.00 | 1 |
| 02/12/2024 | 02/14/2024 | 29.75 | 1 |
| 06/02/2023 | 06/02/2023 | 14.50 | 1 |
| 05/17/2023 | 05/17/2023 | 1.25 | 1 |
| 03/25/2023 | 03/25/2023 | 10.00 | 1 |
| 08/07/2022 | 08/08/2022 | 14.25 | 1 |
Mine Details
MSHA Mine ID2600677
Mine TypeSurface
StatusActive
CommodityNonmetal
SIC DescriptionDiatomaceous Earth (Diatomite)
Employees62
Days/Week7.0
Hours/Shift8.0
Coordinates39.5641670, -119.4808330
Nearest TownSPARKS
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Frequently Asked Questions
How many MSHA violations does Clark Operations have?
Clark Operations has 404 MSHA violations on record, of which 109 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $240K.
What type of mine is Clark Operations?
Clark Operations is a Surface mine producing Nonmetal, located in SPARKS, Storey County, NV. It currently has 62 employees.
Has anyone been injured or killed at Clark Operations?
According to MSHA records, Clark Operations has 37 reported accident/injury records and 0 fatalities on file.
Who operates Clark Operations?
Clark Operations is operated by U.S. Silica Company, LLC and controlled by USS Holdings Inc. MSHA Mine ID: 2600677.