Data / Mines / California / Amador County
Mines in Amador County, California: 8 open mines
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
MSHA lists 8 open mines in Amador County, California, run by 8 operators and employing 157 people. Since January 1, 2022 its inspectors issued 372 citations and orders there with $524,853 in proposed penalties, and operators reported 28 injury or illness cases. The operators with the most open mines are US Mine Corp; Isp Granule Products Inc.; Seduli Sutter Operations Corporation. Data from MSHA, November 6, 2026.
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- Open mines
- 8
- Operators
- 8
- Employees
- 157
- Active
- 3
- Intermittent
- 3
- Temporarily Idled
- 1
- NonProducing
- 1
- Citations and orders since January 1, 2022
- 372
- Significant and substantial
- 83 (22.3%)
- Closure orders
- 14
- High negligence or reckless
- 11
- Proposed penalties
- $524,853
- Amount paid so far
- $330,341
- Inspections
- 117
- Inspector hours on site
- 1,042
- Citations per inspection
- 3.18 (all mines 2.30)
- Accident reports
- 28
- Injury and illness cases
- 28
- Fatalities
- 0
- Latest MSHA record
- July 22, 2026
Operators with the most open mines in Amador 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 |
|---|---|---|---|---|---|
| US Mine Corp | 1 | 50 | 262 | $479,842 | 15 |
| Isp Granule Products Inc. | 1 | 74 | 49 | $28,793 | 12 |
| Seduli Sutter Operations Corporation | 1 | 3 | 18 | $2,518 | 0 |
| Plymouth Sand & Gravel | 1 | 6 | 14 | $2,879 | 0 |
| George Reed Inc | 1 | 15 | 13 | $7,838 | 1 |
| Custom Crushing Industries, Inc | 1 | 3 | 10 | $2,185 | 0 |
| Folsom Ready-Mix, Inc. | 1 | 3 | 6 | $798 | 0 |
| Triangle Rock Products | 1 | 3 | 0 | $0 | 0 |
Operators with the most citations in Amador 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 |
|---|---|---|---|---|---|
| US Mine Corp | 1 | 50 | 262 | $479,842 | 15 |
| Isp Granule Products Inc. | 1 | 74 | 49 | $28,793 | 12 |
| Seduli Sutter Operations Corporation | 1 | 3 | 18 | $2,518 | 0 |
| Plymouth Sand & Gravel | 1 | 6 | 14 | $2,879 | 0 |
| George Reed Inc | 1 | 15 | 13 | $7,838 | 1 |
| Custom Crushing Industries, Inc | 1 | 3 | 10 | $2,185 | 0 |
| Folsom Ready-Mix, Inc. | 1 | 3 | 6 | $798 | 0 |
| Triangle Rock Products | 1 | 3 | 0 | $0 | 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 |
|---|---|---|---|---|---|
| Usmc Ione Plant | US Mine Corp | Amador County, CA | Construction sand and gravel | 50 | 262 |
| Specialty Granules (Ione) LLC | Isp Granule Products Inc. | Amador County, CA | Construction sand and gravel | 74 | 49 |
| Lincoln Mine Project | Seduli Sutter Operations Corporation | Amador County, CA | Gold ore | 3 | 18 |
| Plymouth Sand & Gravel | Plymouth Sand & Gravel | Amador County, CA | Construction sand and gravel | 6 | 14 |
| Jackson Valley Quarry | George Reed Inc | Amador County, CA | Crushed, broken stone | 15 | 13 |
| Portable #1 Big Plant | Custom Crushing Industries, Inc | Amador County, CA | Construction sand and gravel | 3 | 10 |
| China Hill (Volcano) Quarry | Folsom Ready-Mix, Inc. | Amador County, CA | Crushed, broken stone | 3 | 6 |
| TRP Amador Quarry | Triangle Rock Products | Amador County, CA | Sand, common | 3 | 0 |
Main commodities
| Main commodity | Open mines | Share |
|---|---|---|
| Construction sand and gravel | 4 | 50% |
| Crushed, broken stone | 2 | 25% |
| Gold ore | 1 | 12.5% |
| Sand, common | 1 | 12.5% |
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 | 36 | 6 | $22,063 | 5 |
| 2023 | 18 | 3 | $3,672 | 5 |
| 2024 | 114 | 34 | $211,328 | 10 |
| 2025 | 133 | 15 | $142,210 | 8 |
| 2026 | 71 | 25 | $145,580 | 0 |
Standards cited most at mines in Amador 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 | 54 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 47 |
| 30 CFR 56.12004 | Surface metal and nonmetal mines | 25 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 20 |
| 30 CFR 56.11001 | Surface metal and nonmetal mines | 18 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 13 |
| 30 CFR 56.14207 | Surface metal and nonmetal mines | 12 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 10 |
| 30 CFR 56.9300 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.11002 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.14101 | Surface metal and nonmetal mines | 7 |
| 30 CFR 50.30 | Reporting of accidents, injuries and illnesses | 7 |
| 30 CFR 56.11027 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 5 |
Injury and illness cases at mines in Amador County, California
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Permanent disability | 3 |
| Days away from work or restricted activity | 19 |
| No lost time, or an occupational illness | 6 |
What the accident reports at mines in Amador County, California describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Handling of materials | 13 |
| Slip or fall of person | 5 |
| Powered haulage | 3 |
| Machinery | 2 |
| Handtools (nonpowered) | 2 |
| Nonpowered haulage | 1 |
| Striking or bumping | 1 |
| Disorders (repeated trauma) | 1 |
Equipment named in accident reports at mines in Amador County, California
| Equipment | Reports |
|---|---|
| Hand tools (not powered) | 3 |
| Conveyor | 1 |
| Machine | 1 |
| Welding machine | 1 |
| Ore haulage trucks - off highway trucks | 1 |
| Screen | 1 |
| Hand tools (powered) | 1 |
| Man lift | 1 |
| Front-end loader | 1 |
| Crusher | 1 |
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.