Data / Mines / Idaho / Stone mines
Stone mines in Idaho: 45 open mines and MSHA citations
MSHA lists 45 open stone mines in Idaho, run by 37 operators and employing 243 people. Since January 1, 2022 its inspectors issued 324 citations and orders there with $103,663 in proposed penalties, and operators reported 22 injury or illness cases. The operators with the most open mines are Treasure Canyon Calcium Company; H-K Contractors Inc; US Calcium LLC. Data from MSHA, November 6, 2026.
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- Open mines
- 45
- Operators
- 37
- Employees
- 243
- Intermittent
- 33
- Active
- 11
- Temporarily Idled
- 1
- Mines run by individuals, counted and not listed
- 3
- Citations and orders since January 1, 2022
- 324
- Significant and substantial
- 45 (13.9%)
- Closure orders
- 3
- High negligence or reckless
- 18
- Proposed penalties
- $103,663
- Amount paid so far
- $79,149
- Inspections
- 286
- Inspector hours on site
- 1,302
- Citations per inspection
- 1.13 (all mines 2.30)
- Accident reports
- 22
- Injury and illness cases
- 22
- Fatalities
- 0
- Latest MSHA record
- October 29, 2026
Operators with the most open mines in Idaho
Ranked by open mines, then by citations. Sole proprietors and individuals are not listed.
Operators with the most citations in Idaho
Citations and orders issued since January 1, 2022 at their open mines here.
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 |
|---|---|---|---|---|---|
| Idavue Minerals LLC | Idavue Minerals LLC | Clark County, ID | Dimension limestone | 9 | 44 |
| Treasure Canyon Mill #2 | Treasure Canyon Calcium Company | Franklin County, ID | Crushed, broken limestone | 14 | 34 |
| Camas Gravel Crusher #1 | Camas Gravel Company | Idaho County, ID | Crushed, broken stone | 6 | 25 |
| Portable Crusher 134 | H-K Contractors Inc | Fremont County, ID | Crushed, broken stone | 7 | 21 |
| Portable Crusher 133 | H-K Contractors Inc | Bonneville County, ID | Crushed, broken sandstone | 5 | 18 |
| Darlington Mine | US Calcium LLC | Custer County, ID | Crushed, broken limestone | 6 | 14 |
| Rocky Mountain Quartzite Quarry | Northern Stone Supply Inc | Cassia County, ID | Dimension stone | 12 | 12 |
| Treasure Canyon Quarry #2 | Treasure Canyon Calcium Company | Franklin County, ID | Crushed, broken limestone | 8 | 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 |
| Plant 3 | Western Construction of Lewiston, Inc | Clearwater County, ID | Crushed, broken stone | 10 | 9 |
| Hiraya Charcoal | Hiraya Enterprise LLC | Cassia County, ID | Dimension stone | 4 | 8 |
| Broken Rock Sand & Gravel | Broken Rock Sand & Gravel LLC | Ada County, ID | Crushed, broken stone | 6 | 7 |
| Mt Solo Pit | Highland Enterprises LLC | Idaho County, ID | Crushed, broken stone | 4 | 7 |
| Siddoway Pit | Mountain West, LLC | Fremont County, ID | Crushed, broken stone | 2 | 7 |
| Rock Garden | Oakley Mountain Corp | Cassia County, ID | Dimension quartzite | 23 | 6 |
| Gooding Site | US Calcium LLC | Gooding County, ID | Crushed, broken limestone | 3 | 6 |
| Table Rock Sandstone | Table Rock Sandstone, LLC | Ada County, ID | Dimension sandstone | 2 | 6 |
| Crusher | Conmat Group Inc | Kootenai County, ID | Crushed, broken stone | 4 | 5 |
| Strickland Stone | Strickland Stone, LLC | Canyon County, ID | Dimension basalt | 4 | 5 |
| Crusher Unit #2 | Seubert Excavators Inc | Idaho County, ID | Crushed, broken stone | 6 | 4 |
| Bayer Quartzite Quarry | Ruveon LLC | Caribou County, ID | Crushed, broken quartzite | 10 | 3 |
| Rock Placing Co. | Rock Placing Co. | Canyon County, ID | Dimension stone | 7 | 3 |
| Plant #2 | Peak Sand & Gravel Inc | Bonner County, ID | Crushed, broken stone | 6 | 3 |
| Rock Ridge | Oakley Mountain Corp | Cassia County, ID | Dimension stone | 5 | 3 |
| North Idaho Crushing Inc Plant #1 | North Idaho Crushing Inc | Latah County, ID | Crushed, broken stone | 4 | 3 |
| Holmes Pit | Idaho Crushing and Screening | Adams County, ID | Crushed, broken stone | 1 | 3 |
| Oakley Valley Stone Inc | Oakley Valley Stone Inc | Cassia County, ID | Dimension stone | 12 | 2 |
| Ve 45 | Turners Inc. | Idaho County, ID | Crushed, broken stone | 5 | 2 |
| Summit Creek Quarry | Star Stone Quarries | Cassia County, ID | Crushed, broken basalt | 3 | 2 |
| Washington County | Washington County Road & Bridge Dept | Washington County, ID | Crushed, broken traprock | 2 | 2 |
| Jim Sage Quarry | Bne Investments Inc. | Cassia County, ID | Crushed, broken basalt | 2 | 2 |
| Rental Plant | Premier LLC | Gem County, ID | Crushed, broken stone | 2 | 2 |
| North Idaho Crushing Inc Plant #2 | North Idaho Crushing Inc | Latah County, ID | Crushed, broken stone | 3 | 1 |
| Plant #1 | Basin Resources | Kootenai County, ID | Crushed, broken basalt | 2 | 1 |
| Silver Valley Rock Products | Silver Valley Rock Products | Shoshone County, ID | Dimension traprock | 1 | 1 |
| Bayview Pit | Bayview Gravel Pit LLC | Kootenai County, ID | Crushed, broken basalt | 1 | 1 |
| Northern Division Pit | Wood Brothers Trucking, LLC | Boise County, ID | Crushed, broken stone | 12 | 0 |
| Mobile Screen Plant | P-Diamond LLC | Custer County, ID | Crushed, broken limestone | 1 | 0 |
| Mason Ranch Quarry | Total Rock LLC | Washington County, ID | Crushed, broken stone | 1 | 0 |
| Cinnabar Ranch Quarry | Total Rock LLC | Washington County, ID | Crushed, broken stone | 1 | 0 |
| Jaw #1 | Basin Resources | Bonner County, ID | Crushed, broken basalt | 1 | 0 |
Main commodities
| Main commodity | Open mines | Share |
|---|---|---|
| Crushed, broken stone | 19 | 42.2% |
| Dimension stone | 7 | 15.6% |
| Crushed, broken basalt | 6 | 13.3% |
| Crushed, broken limestone | 5 | 11.1% |
| Crushed, broken sandstone | 1 | 2.2% |
| Dimension limestone | 1 | 2.2% |
| Crushed, broken quartzite | 1 | 2.2% |
| Crushed, broken traprock | 1 | 2.2% |
| Dimension quartzite | 1 | 2.2% |
| Dimension sandstone | 1 | 2.2% |
| Dimension traprock | 1 | 2.2% |
| Dimension basalt | 1 | 2.2% |
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 | 63 | 10 | $41,234 | 6 |
| 2023 | 34 | 2 | $5,107 | 5 |
| 2024 | 72 | 9 | $19,359 | 5 |
| 2025 | 87 | 14 | $22,975 | 3 |
| 2026 | 68 | 10 | $14,988 | 3 |
Standards cited most at stone mines in 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 | 38 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 30 |
| 30 CFR 56.12004 | Surface metal and nonmetal mines | 24 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 22 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 19 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 13 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 10 |
| 30 CFR 47.41 | Hazard communication | 8 |
| 30 CFR 56.12028 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.18002 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.12018 | Surface metal and nonmetal mines | 7 |
| 30 CFR 56.12008 | Surface metal and nonmetal mines | 7 |
| 30 CFR 56.9300 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.14101 | Surface metal and nonmetal mines | 6 |
Injury and illness cases at stone mines in Idaho
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Days away from work or restricted activity | 10 |
| No lost time, or an occupational illness | 12 |
What the accident reports at stone mines in Idaho describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Machinery | 4 |
| Slip or fall of person | 4 |
| Handling of materials | 4 |
| Powered haulage | 4 |
| Handtools (nonpowered) | 4 |
| Other | 1 |
| Stepping or kneeling on object | 1 |
Equipment named in accident reports at stone mines in Idaho
| Equipment | Reports |
|---|---|
| Hand tools (not powered) | 4 |
| Front-end loader | 2 |
| Hand tools (powered) | 1 |
| Shovel | 1 |
| Screen | 1 |
| Crane | 1 |
| Forklift | 1 |
| Welding machine | 1 |
| Packaging machine | 1 |
| Conveyor | 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.