Data / Mines / California / Santa Margarita Aggregates
Santa Margarita Aggregates: 17 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Santa Margarita Aggregates is an active construction sand and gravel surface mine in San Luis Obispo County, California, operated by Martin Marietta Northern California Aggregates,LLC with 13 employees on MSHA's record (mine ID 0401616). Since January 1, 2022 MSHA inspectors issued 17 citations and orders there with $13,191 in proposed penalties, and 1 accident report was filed there, with 1 injury or illness case.
The request: Watch Santa Margarita Aggregates (MSHA mine ID 0401616) 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
- 0401616
- Status
- Active since April 23, 1974
- Main commodity
- Construction sand and gravel
- Mine type
- Surface
- County
- San Luis Obispo County, California
- Nearest town
- Santa Margarita
- Operator
- Martin Marietta Northern California Aggregates,LLC
- Parent company
- Martin Marietta Materials Inc
- Employees
- 13
- MSHA field office
- San Bernardino CA Field Office
- Citations and orders since January 1, 2022
- 17
- Significant and substantial
- 4 (23.5%)
- Closure orders
- 0
- High negligence or reckless
- 1
- Proposed penalties
- $13,191
- Amount paid so far
- $13,191
- Inspections
- 12
- Inspector hours on site
- 80
- Citations per inspection
- 1.42 (all mines 2.30)
- Accident reports
- 1
- Injury and illness cases
- 1
- Fatalities
- 0
- Latest MSHA record
- April 27, 2026
- Citations issued to contractors here
- 1 ($239 proposed)
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 | 11 | 3 | $9,337 | 1 |
| 2024 | 2 | 1 | $3,250 | 0 |
| 2025 | 2 | 0 | $302 | 0 |
| 2026 | 2 | 0 | $302 | 0 |
Standards cited most at Santa Margarita Aggregates
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 | 7 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.11012 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.18002 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.11001 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.16005 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.12002 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.12019 | Surface metal and nonmetal mines | 1 |
Injury and illness cases at Santa Margarita Aggregates
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| No lost time, or an occupational illness | 1 |
What the accident reports at Santa Margarita Aggregates describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Slip or fall of person | 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 |
| Rocky Canyon Plant | CalPortland Company | San Luis Obispo County, CA | Crushed, broken granite | 14 | 19 |
| Bianchi Pit | David Crye General Engineering Contractor, Inc. | San Luis Obispo County, CA | Construction sand and gravel | 5 | 19 |
| 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.