Key Takeaway
Sierra Silica Resources is a active surface mine producing Nonmetal, located in Oroville, Butte County, CA. It has 143 violations on record (23 S&S) and $62K in proposed penalties. Operated by Industrial Silica Products, LLC.
Sierra Silica Resources
Operator: Industrial Silica Products, LLC
Controller: Morris Ravine Industrial Minerals LLC; Pinnacle Aggregates LLC; Mining a
Location: Oroville, Butte County, CA
Employees: 30
Recent Violations
View all 143 →| Date | Section | S&S | Negligence | Penalty |
|---|---|---|---|---|
| 10/22/2025 | 56.14107(a) | Non-S&S | LowNegligence | $151 |
| 10/22/2025 | 56.17001 | Non-S&S | LowNegligence | $151 |
| 10/21/2025 | 56.14107(a) | Non-S&S | LowNegligence | $151 |
| 06/10/2025 | 56.20003(a) | Non-S&S | ModNegligence | $151 |
| 06/10/2025 | 56.23002(a) | Non-S&S | LowNegligence | $151 |
| 06/09/2025 | 56.14207 | Non-S&S | ModNegligence | $151 |
| 06/09/2025 | 56.4203 | Non-S&S | ModNegligence | $151 |
| 06/09/2025 | 56.11004 | Non-S&S | ModNegligence | $151 |
| 10/09/2024 | 56.12004 | Non-S&S | LowNegligence | $147 |
| 07/02/2024 | 46.8(a)(2) | Non-S&S | LowNegligence | $164 |
| 07/02/2024 | 56.12028 | Non-S&S | ModNegligence | $147 |
| 11/08/2023 | 56.20003(a) | Non-S&S | ModNegligence | $147 |
| 11/08/2023 | 56.14207 | Non-S&S | ModNegligence | $147 |
| 11/08/2023 | 56.14112(a)(1) | Non-S&S | ModNegligence | $189 |
| 11/08/2023 | 47.41(a) | Non-S&S | ModNegligence | $147 |
| 11/08/2023 | 56.5005(a) | S&S | HighNegligence | $3,944 |
| 11/08/2023 | 56.20003(a) | Non-S&S | ModNegligence | $147 |
| 11/08/2023 | 56.17001 | Non-S&S | ModNegligence | $147 |
| 11/08/2023 | 56.14107(a) | Non-S&S | ModNegligence | $189 |
| 11/08/2023 | 56.14107(a) | Non-S&S | ModNegligence | $189 |
Inspections
View all 49 →| Begin | End | Hours | Inspectors |
|---|---|---|---|
| 11/06/2025 | 11/17/2025 | 15.50 | 1 |
| 10/21/2025 | 10/23/2025 | 24.50 | 1 |
| 06/09/2025 | 06/12/2025 | 20.25 | 1 |
| 10/28/2024 | 10/29/2024 | 13.25 | 1 |
| 10/09/2024 | 10/10/2024 | 8.50 | 1 |
| 07/16/2024 | 07/16/2024 | 2.25 | 1 |
| 07/02/2024 | 07/02/2024 | 11.00 | 1 |
| 01/22/2024 | 01/22/2024 | 2.75 | 1 |
| 12/01/2023 | 12/01/2023 | 3.75 | 1 |
| 11/21/2023 | 11/21/2023 | 5.75 | 1 |
Mine Details
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Frequently Asked Questions
How many MSHA violations does Sierra Silica Resources have?
Sierra Silica Resources has 143 MSHA violations on record, of which 23 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $62K.
What type of mine is Sierra Silica Resources?
Sierra Silica Resources is a Surface mine producing Nonmetal, located in Oroville, Butte County, CA. It currently has 30 employees.
Has anyone been injured or killed at Sierra Silica Resources?
According to MSHA records, Sierra Silica Resources has 0 reported accident/injury records and 0 fatalities on file.
Who operates Sierra Silica Resources?
Sierra Silica Resources is operated by Industrial Silica Products, LLC and controlled by Morris Ravine Industrial Minerals LLC; Pinnacle Aggregates LLC; Mining a. MSHA Mine ID: 0405879.