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

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.