Data / Mines / California / Humboldt County
Mines in Humboldt County, California: 28 open mines
MSHA lists 28 open mines in Humboldt County, California, run by 11 operators and employing 91 people. Since January 1, 2022 its inspectors issued 281 citations and orders there with $66,947 in proposed penalties, and operators reported 2 injury or illness cases. The operators with the most open mines are Kernen Construction; Mercer Fraser Company; Eureka Sand & Gravel Co. Inc.. Data from MSHA, November 6, 2026.
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- Open mines
- 28
- Operators
- 11
- Employees
- 91
- Intermittent
- 20
- Active
- 7
- New Mine
- 1
- Mines run by individuals, counted and not listed
- 4
- Citations and orders since January 1, 2022
- 281
- Significant and substantial
- 42 (14.9%)
- Closure orders
- 15
- High negligence or reckless
- 3
- Proposed penalties
- $66,947
- Amount paid so far
- $60,304
- Inspections
- 215
- Inspector hours on site
- 931
- Citations per inspection
- 1.31 (all mines 2.30)
- Accident reports
- 2
- Injury and illness cases
- 2
- Fatalities
- 0
- Latest MSHA record
- September 24, 2026
Operators with the most open mines in Humboldt County, California
Ranked by open mines, then by citations. Sole proprietors and individuals are not listed.
| Operator | Open mines | Employees | Citations since 2022 | Proposed penalties | Injury cases |
|---|---|---|---|---|---|
| Kernen Construction | 9 | 20 | 58 | $10,279 | 0 |
| Mercer Fraser Company | 5 | 20 | 55 | $10,380 | 0 |
| Eureka Sand & Gravel Co. Inc. | 3 | 9 | 25 | $3,671 | 0 |
| Humboldt Redwood Company LLC | 2 | 13 | 9 | $1,699 | 0 |
| County Of Humboldt | 2 | 6 | 5 | $737 | 2 |
| Hoopa Roads Aggregate and Ready Mix | 1 | 4 | 74 | $32,171 | 0 |
| Wahlund Construction, Inc. | 1 | 4 | 7 | $1,120 | 0 |
| R Brown Construction | 1 | 3 | 4 | $610 | 0 |
Operators with the most citations in Humboldt County, California
Citations and orders issued since January 1, 2022 at their open mines here.
| Operator | Open mines | Employees | Citations since 2022 | Proposed penalties | Injury cases |
|---|---|---|---|---|---|
| Hoopa Roads Aggregate and Ready Mix | 1 | 4 | 74 | $32,171 | 0 |
| Kernen Construction | 9 | 20 | 58 | $10,279 | 0 |
| Mercer Fraser Company | 5 | 20 | 55 | $10,380 | 0 |
| Eureka Sand & Gravel Co. Inc. | 3 | 9 | 25 | $3,671 | 0 |
| Humboldt Redwood Company LLC | 2 | 13 | 9 | $1,699 | 0 |
| Wahlund Construction, Inc. | 1 | 4 | 7 | $1,120 | 0 |
| County Of Humboldt | 2 | 6 | 5 | $737 | 2 |
| R Brown Construction | 1 | 3 | 4 | $610 | 0 |
Mines with the most citations
Open mines, ranked by citations and orders since January 1, 2022.
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Hoopa Valley Tribe Roads Department | Hoopa Roads Aggregate and Ready Mix | Humboldt County, CA | Construction sand and gravel | 4 | 74 |
| Willow Creek Portable Crusher | Mercer Fraser Company | Humboldt County, CA | Dimension stone | 6 | 23 |
| Hatchery Road Crusher | Kernen Construction | Humboldt County, CA | Construction sand and gravel | 3 | 23 |
| Christie Bar | Eureka Sand & Gravel Co. Inc. | Humboldt County, CA | Construction sand and gravel | 4 | 14 |
| Bear Butte Quarry | Kernen Construction | Humboldt County, CA | Crushed, broken stone | 2 | 13 |
| Portable #1 | Mercer Fraser Company | Humboldt County, CA | Construction sand and gravel | 2 | 13 |
| Ford Quarries | Kernen Construction | Humboldt County, CA | Crushed, broken stone | 1 | 12 |
| Alton Pit & Mill | Eureka Sand & Gravel Co. Inc. | Humboldt County, CA | Construction sand and gravel | 3 | 10 |
| Bridgeville Quarry | Mercer Fraser Company | Humboldt County, CA | Crushed, broken stone | 4 | 9 |
| Wahlund Construction, Inc. | Wahlund Construction, Inc. | Humboldt County, CA | Construction sand and gravel | 4 | 7 |
| Mercer Fraser Plant B Portable Crusher | Mercer Fraser Company | Humboldt County, CA | Construction sand and gravel | 4 | 6 |
| Extec | Kernen Construction | Humboldt County, CA | Construction sand and gravel | 2 | 6 |
| Roads Extec Crusher | Humboldt Redwood Company LLC | Humboldt County, CA | Construction sand and gravel | 6 | 5 |
| El Jay Cone | Humboldt Redwood Company LLC | Humboldt County, CA | Construction sand and gravel | 7 | 4 |
| Sandy Prairie Portable Crusher Plant a | Mercer Fraser Company | Humboldt County, CA | Construction sand and gravel | 4 | 4 |
| Humboldt Screener | County Of Humboldt | Humboldt County, CA | Sand, industrial | 4 | 4 |
| Liscom Hill Quarry | R Brown Construction | Humboldt County, CA | Construction sand and gravel | 3 | 4 |
| LT106 Jaw | Kernen Construction | Humboldt County, CA | Construction sand and gravel | 4 | 2 |
| Humboldt Quarries | County Of Humboldt | Humboldt County, CA | Construction sand and gravel | 2 | 1 |
| Erm Rock | Eureka Sand & Gravel Co. Inc. | Humboldt County, CA | Construction sand and gravel | 2 | 1 |
| LT105 Jaw | Kernen Construction | Humboldt County, CA | Crushed, broken stone | 2 | 1 |
| MDS M515 Screener | Kernen Construction | Humboldt County, CA | Crushed, broken stone | 2 | 1 |
| Sandvik Qe442 Screener | Kernen Construction | Humboldt County, CA | Crushed, broken stone | 2 | 0 |
| Powerscreen Trakpactor Crusher | Kernen Construction | Humboldt County, CA | Crushed, broken stone | 2 | 0 |
Main commodities
| Main commodity | Open mines | Share |
|---|---|---|
| Construction sand and gravel | 17 | 60.7% |
| Crushed, broken stone | 8 | 28.6% |
| Dimension stone | 1 | 3.6% |
| Sand, industrial | 1 | 3.6% |
Citations and injury cases by year
Calendar years since 2022; 2026 runs to the date of the MSHA files.
| Year | Citations and orders | Significant and substantial | Proposed penalties | Injury and illness cases |
|---|---|---|---|---|
| 2022 | 49 | 11 | $9,554 | 2 |
| 2023 | 80 | 12 | $22,693 | 0 |
| 2024 | 48 | 8 | $8,012 | 0 |
| 2025 | 68 | 11 | $18,905 | 0 |
| 2026 | 36 | 0 | $7,783 | 0 |
Standards cited most at mines in Humboldt County, California
Sections of Title 30 of the Code of Federal Regulations named on the citations, with the part each belongs to.
| Standard | What the part covers | Citations |
|---|---|---|
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 33 |
| 30 CFR 50.30 | Reporting of accidents, injuries and illnesses | 23 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 20 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 17 |
| 30 CFR 56.12028 | Surface metal and nonmetal mines | 13 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 12 |
| 30 CFR 56.1000 | Surface metal and nonmetal mines | 10 |
| 30 CFR 56.11027 | Surface metal and nonmetal mines | 9 |
| 30 CFR 56.14101 | Surface metal and nonmetal mines | 9 |
| 30 CFR 56.14207 | Surface metal and nonmetal mines | 7 |
| 30 CFR 56.11001 | Surface metal and nonmetal mines | 7 |
| 30 CFR 46.7 | Training at sand, gravel and surface stone mines | 7 |
| 30 CFR 56.9300 | Surface metal and nonmetal mines | 7 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.14130 | Surface metal and nonmetal mines | 5 |
Injury and illness cases at mines in Humboldt County, California
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| No lost time, or an occupational illness | 2 |
What the accident reports at mines in Humboldt County, California describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Slip or fall of person | 1 |
| Handling of materials | 1 |
Equipment named in accident reports at mines in Humboldt County, California
| Equipment | Reports |
|---|---|
| Front-end loader | 1 |
Updated November 6, 2026. Read from US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets. US government work, public domain. Counts come from the MSHA files published on November 6, 2026. An open mine is one MSHA lists as Active, Intermittent, New Mine, Temporarily Idled or NonProducing; 13,673 were open that day. Citations, penalties, inspections and accident reports run from January 1, 2022. A citation is an inspector's allegation and an operator can contest it; the penalty is the amount MSHA first proposed, before any contest or settlement. An operator is the legal entity MSHA assesses, and a parent company is its controller. Mines run by sole proprietors or by individuals are counted in every total and are not named. This page uses MSHA data and is not endorsed or certified by MSHA. Free to reuse with credit to SpecStream under CC BY 4.0. Spot a wrong value? Write to [email protected] with the link to this page.