Data / Mines / Arizona / Thunder Material Source
Thunder Material Source: 23 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Thunder Material Source is an active construction sand and gravel surface mine in Navajo County, Arizona, operated by W W Clyde & Co. with 4 employees on MSHA's record (mine ID 0203378). Since January 1, 2022 MSHA inspectors issued 23 citations and orders there with $5,936 in proposed penalties, and 0 accident reports were filed there, with no injury or illness cases.
The request: Watch Thunder Material Source (MSHA mine ID 0203378) in Navajo County, Arizona: each new citation and each accident report. $10 of work on sign-up, no card.
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- MSHA mine ID
- 0203378
- Status
- Active since October 23, 2025
- Main commodity
- Construction sand and gravel
- Mine type
- Surface
- County
- Navajo County, Arizona
- Nearest town
- Show Low
- Operator
- W W Clyde & Co.
- Parent company
- Cci (Clyde Companies Inc)
- Employees
- 4
- MSHA field office
- Mesa North AZ Field Office
- Citations and orders since January 1, 2022
- 23
- Significant and substantial
- 7 (30.4%)
- Closure orders
- 0
- High negligence or reckless
- 10
- Proposed penalties
- $5,936
- Amount paid so far
- $5,785
- Inspections
- 10
- Inspector hours on site
- 56
- Citations per inspection
- 2.30 (all mines 2.30)
- Accident reports
- 0
- Injury and illness cases
- 0
- Fatalities
- 0
- Latest MSHA record
- April 21, 2026
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 | 2 | 0 | $266 | 0 |
| 2023 | 5 | 2 | $763 | 0 |
| 2024 | 4 | 2 | $904 | 0 |
| 2025 | 11 | 3 | $3,852 | 0 |
| 2026 | 1 | 0 | $151 | 0 |
Standards cited most at Thunder Material Source
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 | 2 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 2 |
| 30 CFR 50.30 | Reporting of accidents, injuries and illnesses | 2 |
| 30 CFR 56.11002 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.4104 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.14130 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.12008 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.4100 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.12030 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.11008 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.15006 | Surface metal and nonmetal mines | 1 |
Other open mines in Navajo County, Arizona
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Decker Pit | Brimhall Sand & Rock & Building Materials | Navajo County, AZ | Construction sand and gravel | 23 | 68 |
| Crushing Plant | W W Clyde & Co. | Navajo County, AZ | Construction sand and gravel | 14 | 37 |
| Kayenta Mine | Peabody Western Coal Company | Navajo County, AZ | Coal (bituminous) | 40 | 32 |
| Aztec Plant | Perkins Cinders Inc | Navajo County, AZ | Construction sand and gravel | 6 | 13 |
| Hardluck Quarry | Brimhall Sand & Rock & Building Materials | Navajo County, AZ | Crushed, broken stone | 10 | 11 |
| Owens Pit | Perkins Cinders Inc | Navajo County, AZ | Crushed, broken stone | 9 | 11 |
| Minnetonka Pit | Dyna Rock LLC | Navajo County, AZ | Construction sand and gravel | 5 | 7 |
| Western Materials Site #1 | Western Materials, LLC | Navajo County, AZ | Construction sand and gravel | 6 | 5 |
| Cooley Knoll Pit | Perkins Cinders Inc | Navajo County, AZ | Construction sand and gravel | 0 | 0 |
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.