Data / Mines / Idaho / Ada County
Mines in Ada County, Idaho: 24 open mines and MSHA citations
MSHA lists 24 open mines in Ada County, Idaho, run by 12 operators and employing 115 people. Since January 1, 2022 its inspectors issued 263 citations and orders there with $108,750 in proposed penalties, and operators reported 16 injury or illness cases. The operators with the most open mines are H & B Crushing LLC; Knife River Corporation Mountain West; Sunroc Corporation. Data from MSHA, November 6, 2026.
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- Open mines
- 24
- Operators
- 12
- Employees
- 115
- Intermittent
- 12
- Active
- 11
- New Mine
- 1
- Mines run by individuals, counted and not listed
- 1
- Citations and orders since January 1, 2022
- 263
- Significant and substantial
- 28 (10.6%)
- Closure orders
- 1
- High negligence or reckless
- 13
- Proposed penalties
- $108,750
- Amount paid so far
- $108,325
- Inspections
- 223
- Inspector hours on site
- 976
- Citations per inspection
- 1.18 (all mines 2.30)
- Accident reports
- 16
- Injury and illness cases
- 16
- Fatalities
- 0
- Latest MSHA record
- October 28, 2026
Operators with the most open mines in Ada 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 |
|---|---|---|---|---|---|
| H & B Crushing LLC | 6 | 22 | 64 | $10,230 | 2 |
| Knife River Corporation Mountain West | 3 | 13 | 26 | $8,506 | 4 |
| Sunroc Corporation | 3 | 11 | 16 | $4,131 | 2 |
| Premier LLC | 2 | 9 | 81 | $74,048 | 0 |
| Western Construction Inc | 2 | 22 | 4 | $586 | 3 |
| Lurre Construction | 1 | 3 | 23 | $3,917 | 3 |
| Idaho Grading and Trucking, L.L.C. | 1 | 8 | 18 | $2,538 | 0 |
| Greyhound Mine & Milling, Inc. | 1 | 6 | 10 | $1,470 | 2 |
| Broken Rock Sand & Gravel LLC | 1 | 6 | 7 | $1,304 | 0 |
| Table Rock Sandstone, LLC | 1 | 2 | 6 | $850 | 0 |
| Carco Mineral Resources Inc | 1 | 8 | 5 | $739 | 0 |
| Ruschman Sand & Gravel Inc | 1 | 5 | 3 | $431 | 0 |
Operators with the most citations in Ada 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 |
|---|---|---|---|---|---|
| Premier LLC | 2 | 9 | 81 | $74,048 | 0 |
| H & B Crushing LLC | 6 | 22 | 64 | $10,230 | 2 |
| Knife River Corporation Mountain West | 3 | 13 | 26 | $8,506 | 4 |
| Lurre Construction | 1 | 3 | 23 | $3,917 | 3 |
| Idaho Grading and Trucking, L.L.C. | 1 | 8 | 18 | $2,538 | 0 |
| Sunroc Corporation | 3 | 11 | 16 | $4,131 | 2 |
| Greyhound Mine & Milling, Inc. | 1 | 6 | 10 | $1,470 | 2 |
| Broken Rock Sand & Gravel LLC | 1 | 6 | 7 | $1,304 | 0 |
| Table Rock Sandstone, LLC | 1 | 2 | 6 | $850 | 0 |
| Carco Mineral Resources Inc | 1 | 8 | 5 | $739 | 0 |
| Western Construction Inc | 2 | 22 | 4 | $586 | 3 |
| Ruschman Sand & Gravel Inc | 1 | 5 | 3 | $431 | 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 |
|---|---|---|---|---|---|
| Rock Force 1 | Premier LLC | Ada County, ID | Construction sand and gravel | 6 | 48 |
| Liberty | Premier LLC | Ada County, ID | Construction sand and gravel | 3 | 33 |
| CR4 | Lurre Construction | Ada County, ID | Construction sand and gravel | 3 | 23 |
| Igt Sand and Gravel | Idaho Grading and Trucking, L.L.C. | Ada County, ID | Construction sand and gravel | 8 | 18 |
| Crusher #1 | Knife River Corporation Mountain West | Ada County, ID | Construction sand and gravel | 7 | 18 |
| Plant #2 | H & B Crushing LLC | Ada County, ID | Construction sand and gravel | 4 | 17 |
| Plant #4 | H & B Crushing LLC | Ada County, ID | Construction sand and gravel | 4 | 14 |
| Plant #3 | H & B Crushing LLC | Ada County, ID | Construction sand and gravel | 3 | 13 |
| Plant #7 | H & B Crushing LLC | Ada County, ID | Construction sand and gravel | 5 | 11 |
| Golden Eagle | Greyhound Mine & Milling, Inc. | Ada County, ID | Gold ore | 6 | 10 |
| Notus Pit Boise River Road | Sunroc Corporation | Ada County, ID | Construction sand and gravel | 5 | 8 |
| Wash Plant 2 | Knife River Corporation Mountain West | Ada County, ID | Construction sand and gravel | 4 | 8 |
| Broken Rock Sand & Gravel | Broken Rock Sand & Gravel LLC | Ada County, ID | Crushed, broken stone | 6 | 7 |
| Mobile Impact Crusher | Sunroc Corporation | Ada County, ID | Construction sand and gravel | 4 | 7 |
| Table Rock Sandstone | Table Rock Sandstone, LLC | Ada County, ID | Dimension sandstone | 2 | 6 |
| Caldwell Plant | Carco Mineral Resources Inc | Ada County, ID | Common clays | 8 | 5 |
| Plant #8 | H & B Crushing LLC | Ada County, ID | Construction sand and gravel | 3 | 5 |
| Plant #6, Wash Plant | H & B Crushing LLC | Ada County, ID | Construction sand and gravel | 3 | 4 |
| Portable Crusher #2 | Western Construction Inc | Ada County, ID | Construction sand and gravel | 12 | 3 |
| Pleasant Valley Pit | Ruschman Sand & Gravel Inc | Ada County, ID | Construction sand and gravel | 5 | 3 |
| Portable Crusher #1 | Western Construction Inc | Ada County, ID | Construction sand and gravel | 10 | 1 |
| Badger Pit | Sunroc Corporation | Ada County, ID | Construction sand and gravel | 2 | 1 |
| Wash Plant 3 | Knife River Corporation Mountain West | Ada County, ID | Construction sand and gravel | 2 | 0 |
Main commodities
| Main commodity | Open mines | Share |
|---|---|---|
| Construction sand and gravel | 19 | 79.2% |
| Common clays | 1 | 4.2% |
| Dimension sandstone | 1 | 4.2% |
| Gold ore | 1 | 4.2% |
| Crushed, broken stone | 1 | 4.2% |
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 | 29 | 2 | $4,112 | 3 |
| 2023 | 26 | 1 | $4,359 | 3 |
| 2024 | 80 | 7 | $14,625 | 2 |
| 2025 | 89 | 12 | $79,240 | 4 |
| 2026 | 39 | 6 | $6,414 | 4 |
Standards cited most at mines in Ada 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 56.14107 | Surface metal and nonmetal mines | 45 |
| 30 CFR 56.12004 | Surface metal and nonmetal mines | 28 |
| 30 CFR 56.12008 | Surface metal and nonmetal mines | 20 |
| 30 CFR 50.30 | Reporting of accidents, injuries and illnesses | 20 |
| 30 CFR 56.18002 | Surface metal and nonmetal mines | 11 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 10 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 7 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 7 |
| 30 CFR 56.9301 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.9300 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.11002 | Surface metal and nonmetal mines | 4 |
| 30 CFR 62.120 | Occupational noise exposure | 4 |
Injury and illness cases at mines in Ada County, Idaho
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Permanent disability | 1 |
| Days away from work or restricted activity | 8 |
| No lost time, or an occupational illness | 7 |
What the accident reports at mines in Ada County, 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 | 3 |
| Handtools (nonpowered) | 2 |
| Fire | 1 |
| Other | 1 |
| Powered haulage | 1 |
Equipment named in accident reports at mines in Ada County, Idaho
| Equipment | Reports |
|---|---|
| Hand tools (not powered) | 2 |
| Bulldozer | 1 |
| Crusher | 1 |
| Shovel | 1 |
| Hand tools (powered) | 1 |
| Conveyor | 1 |
| Electric drills | 1 |
| Trucks | 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.