Data / Mines / Summit Materials LLC
Summit Materials LLC: 62 open mines, 943 MSHA citations
Summit Materials LLC (MSHA controller ID M02046) controls 62 open mines through 8 operators, with 456 employees in 8 states, mostly construction sand and gravel. Since January 1, 2022 MSHA issued 943 citations and orders at those mines with $454,970 in proposed penalties, and operators reported 57 injury or illness cases, 1 of them fatal. Data from MSHA, November 6, 2026.
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- MSHA controller ID
- M02046
- Open mines
- 62
- Operators
- 8
- Employees
- 456
- States
- 8
- Citations and orders since January 1, 2022
- 943
- Significant and substantial
- 168 (17.8%)
- Closure orders
- 22
- High negligence or reckless
- 59
- Proposed penalties
- $454,970
- Amount paid so far
- $411,336
- Inspections
- 622
- Inspector hours on site
- 4,514
- Citations per inspection
- 1.52 (all mines 2.30)
- Accident reports
- 60
- Injury and illness cases
- 57
- Fatalities
- 1
- Latest MSHA record
- October 29, 2026
Operators under Summit Materials LLC
| Operator | Open mines | Employees | Citations since 2022 | Proposed penalties | Injury cases |
|---|---|---|---|---|---|
| Arizona Materials | 33 | 152 | 484 | $250,871 | 29 |
| Cornejo & Sons LLC | 11 | 91 | 191 | $85,617 | 7 |
| Alleyton Resource Company, LLC. | 11 | 109 | 163 | $75,800 | 10 |
| Smith Crushed Stone | 3 | 75 | 46 | $8,790 | 6 |
| Alleyton Resource | 1 | 6 | 21 | $27,320 | 3 |
| Laredo Paving Inc | 1 | 6 | 14 | $2,090 | 1 |
| RK Hall LLC | 1 | 12 | 13 | $2,743 | 1 |
| Troy Vines Inc | 1 | 5 | 11 | $1,739 | 0 |
Mines with the most citations
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Stewart Stone Mitchell | Cornejo & Sons LLC | Pawnee County, OK | Crushed, broken limestone | 25 | 54 |
| Bluffdale Pit | Arizona Materials | Utah County, UT | Construction sand and gravel | 3 | 52 |
| Parley's Stone | Arizona Materials | Salt Lake County, UT | Construction sand and gravel | 8 | 47 |
| Wichita Sand and Gravel | Cornejo & Sons LLC | Sedgwick County, KS | Construction sand and gravel | 10 | 44 |
| Highland Pit | Arizona Materials | Utah County, UT | Construction sand and gravel | 10 | 39 |
| Hockley Plant | Alleyton Resource Company, LLC. | Harris County, TX | Construction sand and gravel | 3 | 32 |
| Maryland Creek | Arizona Materials | Summit County, CO | Construction sand and gravel | 10 | 30 |
| Mona Pit | Arizona Materials | Juab County, UT | Construction sand and gravel | 5 | 28 |
| Pit #1 43RD Ave | Arizona Materials | Maricopa County, AZ | Construction sand and gravel | 14 | 26 |
| Oxford Sand and Gravel | Cornejo & Sons LLC | Sumner County, KS | Construction sand and gravel | 8 | 25 |
| Hyrum Pit | Arizona Materials | Cache County, UT | Construction sand and gravel | 7 | 24 |
| Benjamin | Arizona Materials | Utah County, UT | Construction sand and gravel | 6 | 24 |
| Little Mountain | Arizona Materials | Box Elder County, UT | Construction sand and gravel | 2 | 23 |
| Grantsville Pit | Arizona Materials | Tooele County, UT | Construction sand and gravel | 2 | 23 |
| Eagle Lake Plant | Alleyton Resource Company, LLC. | Colorado County, TX | Construction sand and gravel | 8 | 22 |
| Stockton Pit | Arizona Materials | Tooele County, UT | Construction sand and gravel | 4 | 22 |
| Plant 1 Avondale | Arizona Materials | Maricopa County, AZ | Construction sand and gravel | 10 | 21 |
| Hays Quarry | Alleyton Resource | Hays County, TX | Crushed, broken limestone | 6 | 21 |
| Smith Plant | Alleyton Resource Company, LLC. | Colorado County, TX | Crushed, broken stone | 4 | 21 |
| Severy Quarry | Cornejo & Sons LLC | Greenwood County, KS | Crushed, broken limestone | 8 | 20 |
| West Valley | Arizona Materials | Salt Lake County, UT | Construction sand and gravel | 2 | 20 |
| Brigham Pit | Arizona Materials | Box Elder County, UT | Construction sand and gravel | 4 | 19 |
| Sawyer Quarry | Smith Crushed Stone | Choctaw County, OK | Crushed, broken sandstone | 49 | 18 |
| Portable Crusher Unit F | Arizona Materials | Sweetwater County, WY | Construction sand and gravel | 9 | 18 |
| Hanna's Bend Plant | Alleyton Resource Company, LLC. | Liberty County, TX | Construction sand and gravel | 5 | 18 |
| Duncan Plant | Alleyton Resource Company, LLC. | Colorado County, TX | Sand, industrial | 9 | 16 |
| Durbin Quarry | Cornejo & Sons LLC | Elk County, KS | Crushed, broken limestone | 9 | 15 |
| Coleman Quarry-SCS Materials | Smith Crushed Stone | Atoka County, OK | Dimension limestone | 7 | 15 |
| Walker Sand & Gravel | Arizona Materials | Blaine County, ID | Construction sand and gravel | 9 | 14 |
| Crusher Lu300-Lu400 | Laredo Paving Inc | Glasscock County, TX | Crushed, broken stone | 6 | 14 |
| Pope's Point | Smith Crushed Stone | Bryan County, OK | Sand, industrial | 19 | 13 |
| Atoka Quarry | RK Hall LLC | Atoka County, OK | Crushed, broken limestone | 12 | 13 |
| Ellinger Plant | Alleyton Resource Company, LLC. | Fayette County, TX | Construction sand and gravel | 20 | 12 |
| Portable Plant #3 | Cornejo & Sons LLC | Wilson County, KS | Crushed, broken limestone | 11 | 12 |
| Vox Plant | Alleyton Resource Company, LLC. | Colorado County, TX | Construction sand and gravel | 11 | 12 |
| Spring Plant | Alleyton Resource Company, LLC. | Harris County, TX | Construction sand and gravel | 7 | 11 |
| Vines Sand & Gravel | Troy Vines Inc | Ward County, TX | Construction sand and gravel | 5 | 11 |
| Wegenhoft Plant | Alleyton Resource Company, LLC. | Fayette County, TX | Construction sand and gravel | 14 | 9 |
| Portable Plant #6 | Cornejo & Sons LLC | Montgomery County, KS | Crushed, broken limestone | 10 | 9 |
| Portable Plant #2 | Cornejo & Sons LLC | Crawford County, KS | Crushed, broken stone | 3 | 9 |
| Crusher 1 | Arizona Materials | Mesa County, CO | Construction sand and gravel | 5 | 8 |
| Columbus Plant | Alleyton Resource Company, LLC. | Colorado County, TX | Construction sand and gravel | 25 | 7 |
| Grey Goose | Arizona Materials | Grand County, CO | Construction sand and gravel | 5 | 6 |
| Crusher 3 | Arizona Materials | Emery County, UT | Construction sand and gravel | 4 | 6 |
| Crusher 2 | Arizona Materials | Delta County, CO | Construction sand and gravel | 5 | 5 |
| Herriman Pit | Arizona Materials | Salt Lake County, UT | Construction sand and gravel | 2 | 5 |
| HP 300 (Crusher 4) | Arizona Materials | Delta County, CO | Construction sand and gravel | 3 | 4 |
| Erda Pit | Arizona Materials | Salt Lake County, UT | Construction sand and gravel | 2 | 4 |
| Buckeye Plant | Arizona Materials | Maricopa County, AZ | Construction sand and gravel | 0 | 4 |
| Washplant 1 | Arizona Materials | Mesa County, CO | Construction sand and gravel | 3 | 3 |
| Altair Plant | Alleyton Resource Company, LLC. | Colorado County, TX | Construction sand and gravel | 3 | 3 |
| Washplant 4 | Arizona Materials | La Plata County, CO | Construction sand and gravel | 2 | 3 |
| Coffeyville Quarry | Cornejo & Sons LLC | Labette County, KS | Crushed, broken limestone | 4 | 2 |
| Washplant 3 | Arizona Materials | Mesa County, CO | Construction sand and gravel | 3 | 2 |
| Wellsville Pit | Arizona Materials | Cache County, UT | Construction sand and gravel | 2 | 2 |
| Gentry Pit | Arizona Materials | Minidoka County, ID | Construction sand and gravel | 2 | 1 |
| Portable Plant #7 | Cornejo & Sons LLC | Bourbon County, KS | Crushed, broken limestone | 2 | 1 |
| Washplant 5 | Arizona Materials | Grand County, UT | Construction sand and gravel | 1 | 1 |
| Crusher #6 | Arizona Materials | Mesa County, CO | Construction sand and gravel | 4 | 0 |
| Crusher 5 | Arizona Materials | La Plata County, CO | Construction sand and gravel | 4 | 0 |
| Fort Scott Quarry | Cornejo & Sons LLC | Bourbon County, KS | Crushed, broken limestone | 1 | 0 |
| Track Plant 1 | Arizona Materials | Routt County, CO | Construction sand and gravel | 0 | 0 |
States
Commodities
| Main commodity | Open mines |
|---|---|
| Construction sand and gravel | 45 |
| Crushed, broken limestone | 10 |
| Crushed, broken stone | 3 |
| Sand, industrial | 2 |
| Crushed, broken sandstone | 1 |
| Dimension limestone | 1 |
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 | 196 | 35 | $65,012 | 10 |
| 2023 | 183 | 46 | $132,231 | 10 |
| 2024 | 171 | 29 | $103,180 | 8 |
| 2025 | 240 | 43 | $103,030 | 11 |
| 2026 | 153 | 15 | $51,517 | 18 |
Standards cited most at mines controlled by Summit Materials LLC
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 56.12004 | Surface metal and nonmetal mines | 84 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 83 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 81 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 47 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 39 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 38 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 36 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 29 |
| 30 CFR 56.12018 | Surface metal and nonmetal mines | 23 |
| 30 CFR 56.9300 | Surface metal and nonmetal mines | 23 |
| 30 CFR 56.11001 | Surface metal and nonmetal mines | 22 |
| 30 CFR 56.14101 | Surface metal and nonmetal mines | 22 |
| 30 CFR 56.12008 | Surface metal and nonmetal mines | 19 |
| 30 CFR 56.4101 | Surface metal and nonmetal mines | 18 |
| 30 CFR 56.14207 | Surface metal and nonmetal mines | 18 |
Injury and illness cases at mines controlled by Summit Materials LLC
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Fatality | 1 |
| Days away from work or restricted activity | 33 |
| No lost time, or an occupational illness | 23 |
What the accident reports at mines controlled by Summit Materials LLC describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Handling of materials | 18 |
| Handtools (nonpowered) | 11 |
| Machinery | 11 |
| Slip or fall of person | 9 |
| Powered haulage | 8 |
| Fire | 1 |
| Inundation | 1 |
| Other | 1 |
Equipment named in accident reports at mines controlled by Summit Materials LLC
| Equipment | Reports |
|---|---|
| Hand tools (not powered) | 11 |
| Hand tools (powered) | 6 |
| Shovel | 4 |
| Front-end loader | 3 |
| Conveyor | 3 |
| Ore haulage trucks - off highway trucks | 2 |
| Forklift | 2 |
| Trucks | 1 |
| Ore haulage trucks - on highway trucks | 1 |
| Welding machine | 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.