Data / Mines / Arizona / Cooley Knoll Pit
Cooley Knoll Pit, Navajo County, Arizona: 0 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Cooley Knoll Pit is a temporarily idled construction sand and gravel surface mine in Navajo County, Arizona, operated by Perkins Cinders Inc with 0 employees on MSHA's record (mine ID 0202969). Since January 1, 2022 MSHA inspectors issued 0 citations and orders there with $0 in proposed penalties, and 0 accident reports were filed there, with no injury or illness cases.
The request: Watch Cooley Knoll Pit (MSHA mine ID 0202969) 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
- 0202969
- Status
- Temporarily Idled since June 25, 2025
- Main commodity
- Construction sand and gravel
- Mine type
- Surface
- County
- Navajo County, Arizona
- Nearest town
- Taylor
- Operator
- Perkins Cinders Inc
- Employees
- 0
- MSHA field office
- Mesa North AZ Field Office
- Citations and orders since January 1, 2022
- 0
- Inspections
- 3
- Inspector hours on site
- 3
- Citations per inspection
- 0.00 (all mines 2.30)
- Accident reports
- 0
- Injury and illness cases
- 0
- Fatalities
- 0
- Latest MSHA record
- September 3, 2026
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 |
| Thunder Material Source | W W Clyde & Co. | Navajo County, AZ | Construction sand and gravel | 4 | 23 |
| 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 |
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.