Data / Mines / Idaho / Cassia County
Mines in Cassia County, Idaho: 12 open mines
MSHA lists 12 open mines in Cassia County, Idaho, run by 9 operators and employing 107 people. Since January 1, 2022 its inspectors issued 65 citations and orders there with $39,425 in proposed penalties, and operators reported 2 injury or illness cases. The operators with the most open mines are Star Stone Quarries; Oakley Mountain Corp; Northern Stone Supply Inc. Data from MSHA, November 6, 2026.
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- Open mines
- 12
- Operators
- 9
- Employees
- 107
- Intermittent
- 11
- Active
- 1
- Citations and orders since January 1, 2022
- 65
- Significant and substantial
- 11 (16.9%)
- Closure orders
- 1
- High negligence or reckless
- 3
- Proposed penalties
- $39,425
- Amount paid so far
- $16,020
- Inspections
- 68
- Inspector hours on site
- 217
- Citations per inspection
- 0.96 (all mines 2.30)
- Accident reports
- 2
- Injury and illness cases
- 2
- Fatalities
- 0
- Latest MSHA record
- October 6, 2026
Operators with the most open mines in Cassia County, Idaho
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 |
|---|---|---|---|---|---|
| Star Stone Quarries | 3 | 23 | 13 | $30,799 | 1 |
| Oakley Mountain Corp | 2 | 28 | 9 | $1,617 | 0 |
| Northern Stone Supply Inc | 1 | 12 | 12 | $1,795 | 0 |
| Lone Pine Natural Stone, LLC | 1 | 5 | 10 | $1,172 | 0 |
| Hiraya Enterprise LLC | 1 | 4 | 8 | $2,238 | 1 |
| High Output Construction | 1 | 3 | 7 | $906 | 0 |
| Bne Investments Inc. | 1 | 2 | 2 | $302 | 0 |
| Bolinder Resources | 1 | 18 | 2 | $302 | 0 |
| Oakley Valley Stone Inc | 1 | 12 | 2 | $294 | 0 |
Operators with the most citations in Cassia County, Idaho
Citations and orders issued since January 1, 2022 at their open mines here.
| Operator | Open mines | Employees | Citations since 2022 | Proposed penalties | Injury cases |
|---|---|---|---|---|---|
| Star Stone Quarries | 3 | 23 | 13 | $30,799 | 1 |
| Northern Stone Supply Inc | 1 | 12 | 12 | $1,795 | 0 |
| Lone Pine Natural Stone, LLC | 1 | 5 | 10 | $1,172 | 0 |
| Oakley Mountain Corp | 2 | 28 | 9 | $1,617 | 0 |
| Hiraya Enterprise LLC | 1 | 4 | 8 | $2,238 | 1 |
| High Output Construction | 1 | 3 | 7 | $906 | 0 |
| Bne Investments Inc. | 1 | 2 | 2 | $302 | 0 |
| Bolinder Resources | 1 | 18 | 2 | $302 | 0 |
| Oakley Valley Stone Inc | 1 | 12 | 2 | $294 | 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 |
|---|---|---|---|---|---|
| Rocky Mountain Quartzite Quarry | Northern Stone Supply Inc | Cassia County, ID | Dimension stone | 12 | 12 |
| Birch Creek | Lone Pine Natural Stone, LLC | Cassia County, ID | Dimension stone | 5 | 10 |
| Moulton Yard | Star Stone Quarries | Cassia County, ID | Dimension stone | 12 | 9 |
| Hiraya Charcoal | Hiraya Enterprise LLC | Cassia County, ID | Dimension stone | 4 | 8 |
| Six S Mine | High Output Construction | Cassia County, ID | Construction sand and gravel | 3 | 7 |
| Rock Garden | Oakley Mountain Corp | Cassia County, ID | Dimension quartzite | 23 | 6 |
| Rock Ridge | Oakley Mountain Corp | Cassia County, ID | Dimension stone | 5 | 3 |
| Mobile #4 | Bolinder Resources | Cassia County, ID | Construction sand and gravel | 18 | 2 |
| Oakley Valley Stone Inc | Oakley Valley Stone Inc | Cassia County, ID | Dimension stone | 12 | 2 |
| Portable 1 | Star Stone Quarries | Cassia County, ID | Construction sand and gravel | 8 | 2 |
| Summit Creek Quarry | Star Stone Quarries | Cassia County, ID | Crushed, broken basalt | 3 | 2 |
| Jim Sage Quarry | Bne Investments Inc. | Cassia County, ID | Crushed, broken basalt | 2 | 2 |
Main commodities
| Main commodity | Open mines | Share |
|---|---|---|
| Dimension stone | 6 | 50% |
| Construction sand and gravel | 3 | 25% |
| Crushed, broken basalt | 2 | 16.7% |
| Dimension quartzite | 1 | 8.3% |
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 | 19 | 4 | $32,893 | 1 |
| 2023 | 2 | 0 | $286 | 0 |
| 2024 | 7 | 2 | $1,086 | 1 |
| 2025 | 25 | 4 | $3,775 | 0 |
| 2026 | 12 | 1 | $1,385 | 0 |
Standards cited most at mines in Cassia County, Idaho
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 50.30 | Reporting of accidents, injuries and illnesses | 15 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 12 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.18002 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.9300 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 2 |
| 30 CFR 46.9 | Training at sand, gravel and surface stone mines | 2 |
| 30 CFR 56.4200 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.23003 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.14207 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.4501 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.9301 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.4203 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.4402 | Surface metal and nonmetal mines | 1 |
Injury and illness cases at mines in Cassia County, Idaho
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Days away from work or restricted activity | 2 |
What the accident reports at mines in Cassia County, Idaho describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Handling of materials | 2 |
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.