Data / Mines / California / Rocky Canyon Plant
Rocky Canyon Plant: 19 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Rocky Canyon Plant is an active crushed, broken granite surface mine in San Luis Obispo County, California, operated by CalPortland Company with 14 employees on MSHA's record (mine ID 0404634). Since January 1, 2022 MSHA inspectors issued 19 citations and orders there with $7,122 in proposed penalties, and 4 accident reports were filed there, with 4 injury or illness cases.
The request: Watch Rocky Canyon Plant (MSHA mine ID 0404634) in San Luis Obispo County, California: each new citation and each accident report. $10 of work on sign-up, no card.
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- MSHA mine ID
- 0404634
- Status
- Active since April 11, 1983
- Main commodity
- Crushed, broken granite
- Mine type
- Surface
- County
- San Luis Obispo County, California
- Nearest town
- Atascadero
- Operator
- CalPortland Company
- Parent company
- Taiheiyo Cement Corp
- Employees
- 14
- MSHA field office
- San Bernardino CA Field Office
- Citations and orders since January 1, 2022
- 19
- Significant and substantial
- 6 (31.6%)
- Closure orders
- 2
- High negligence or reckless
- 3
- Proposed penalties
- $7,122
- Amount paid so far
- $7,122
- Inspections
- 10
- Inspector hours on site
- 102
- Citations per inspection
- 1.90 (all mines 2.30)
- Accident reports
- 4
- Injury and illness cases
- 4
- Fatalities
- 0
- Latest MSHA record
- July 8, 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 | 7 | 3 | $1,524 | 0 |
| 2023 | 2 | 1 | $935 | 1 |
| 2024 | 8 | 2 | $4,361 | 0 |
| 2025 | 1 | 0 | $151 | 0 |
| 2026 | 1 | 0 | $151 | 3 |
Standards cited most at Rocky Canyon Plant
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 56.20003 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.18002 | Surface metal and nonmetal mines | 2 |
| 30 CFR 46.7 | Training at sand, gravel and surface stone mines | 2 |
| 30 CFR 47.44 | Hazard communication | 2 |
| 30 CFR 56.12008 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.12030 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.11001 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.4500 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.4011 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.16005 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.12019 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.16001 | Surface metal and nonmetal mines | 1 |
Injury and illness cases at Rocky Canyon Plant
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Days away from work or restricted activity | 4 |
What the accident reports at Rocky Canyon Plant describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Handling of materials | 3 |
| Handtools (nonpowered) | 1 |
Equipment named in accident reports at Rocky Canyon Plant
| Equipment | Reports |
|---|---|
| Hand tools (not powered) | 1 |
Other open mines in San Luis Obispo County, California
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Blue Mountain Minerals PR LLC | Blue Mountain Minerals PR LLC | San Luis Obispo County, CA | Crushed, broken limestone | 12 | 29 |
| Bianchi Pit | David Crye General Engineering Contractor, Inc. | San Luis Obispo County, CA | Construction sand and gravel | 5 | 19 |
| Santa Margarita Aggregates | Martin Marietta Northern California Aggregates,LLC | San Luis Obispo County, CA | Construction sand and gravel | 13 | 17 |
| Navajo Rock & Block | David Crye General Engineering Contractor, Inc. | San Luis Obispo County, CA | Construction sand and gravel | 2 | 13 |
| Whale Rock Quarry | Negranti & Sons | San Luis Obispo County, CA | Crushed, broken stone | 5 | 11 |
| Warrior 1800/Cone Crusher FT200 | David Crye General Engineering Contractor, Inc. | San Luis Obispo County, CA | Sand, industrial | 3 | 6 |
| MTN Springs RD. Pit | Viborg Sand & Gravel Inc | San Luis Obispo County, CA | Construction sand and gravel | 1 | 4 |
| Estrella Sand Pit | Viborg Sand & Gravel Inc | San Luis Obispo County, CA | Sand, industrial | 1 | 3 |
| Paso Robles Plant | CalPortland Company | San Luis Obispo County, CA | Construction sand and gravel | 3 | 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.