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Data / Mines / California / Corona

Corona, Riverside County, California: 13 MSHA citations

Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.

Corona is an active construction sand and gravel surface mine in Riverside County, California, operated by Robertson's Ready Mix Ltd with 27 employees on MSHA's record (mine ID 0405887). Since January 1, 2022 MSHA inspectors issued 13 citations and orders there with $2,456 in proposed penalties, and 11 accident reports were filed there, with 11 injury or illness cases.

The request: Watch Corona (MSHA mine ID 0405887) in Riverside County, California: each new citation and each accident report. $10 of work on sign-up, no card.

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MSHA mine ID
0405887
Status
Active since April 28, 2015
Main commodity
Construction sand and gravel
Mine type
Surface
County
Riverside County, California
Nearest town
Corona
Operator
Robertson's Ready Mix Ltd
Employees
27
MSHA field office
San Bernardino CA Field Office
Citations and orders since January 1, 2022
13
Significant and substantial
3 (23.1%)
Closure orders
0
High negligence or reckless
1
Proposed penalties
$2,456
Amount paid so far
$2,456
Inspections
14
Inspector hours on site
107
Citations per inspection
0.93 (all mines 2.30)
Accident reports
11
Injury and illness cases
11
Fatalities
0
Latest MSHA record
September 11, 2026
Citations issued to contractors here
1 ($133 proposed)

Citations and injury cases by year

Calendar years since 2022; 2026 runs to the date of the MSHA files.

YearCitations and ordersSignificant and substantialProposed penaltiesInjury and illness cases
202251$1,2681
202321$2862
202410$1472
202541$6043
202610$1513

Standards cited most at Corona

Sections of Title 30 of the Code of Federal Regulations named on the citations, with the part each belongs to.

StandardWhat the part coversCitations
30 CFR 56.14100Surface metal and nonmetal mines2
30 CFR 56.14105Surface metal and nonmetal mines2
30 CFR 56.20003Surface metal and nonmetal mines2
30 CFR 50.20-1Reporting of accidents, injuries and illnesses2
30 CFR 56.4601Surface metal and nonmetal mines1
30 CFR 56.14207Surface metal and nonmetal mines1
30 CFR 56.11002Surface metal and nonmetal mines1
30 CFR 56.20011Surface metal and nonmetal mines1
30 CFR 56.4200Surface metal and nonmetal mines1

Injury and illness cases at Corona

Accident reports by degree of injury, as the operator reported them to MSHA.

DegreeCases
Days away from work or restricted activity9
No lost time, or an occupational illness2

What the accident reports at Corona describe

Accident classification, as MSHA codes the circumstances that contributed most directly.

ClassificationReports
Handling of materials3
Handtools (nonpowered)3
Machinery3
Striking or bumping1
Powered haulage1

Equipment named in accident reports at Corona

EquipmentReports
Hand tools (not powered)3
Welding machine2
Hand tools (powered)1
Front-end loader1

Other open mines in Riverside County, California

MineOperatorCountyMain commodityEmployeesCitations since 2022
3M Corona Plant3M CompanyRiverside County, CACrushed, broken stone8566
3MFst Sand & Gravel IncRiverside County, CAConstruction sand and gravel9347
Coachella Valley AggregateCoachella Valley Aggregates IncRiverside County, CAConstruction sand and gravel1139
Nichols Road PitChandler Aggregates IncRiverside County, CAConstruction sand and gravel2335
North FontanaEarth Tek Engineering Corp.Riverside County, CAConstruction sand and gravel635
HJ HoveHi-Grade MaterialsRiverside County, CAConstruction sand and gravel1934
Chandler Aggregates, Gilman SpringsChandler Aggregates IncRiverside County, CADimension limestone2032
Pacific Aggregates PitsPacific Aggregates IncRiverside County, CAConstruction sand and gravel3031
Maitri Sand and GravelHanson Aggregates LLCRiverside County, CAConstruction sand and gravel1530
Thousand Palms PitCoronet Concrete Products IncRiverside County, CAConstruction sand and gravel628
Plant #5Onyx MaterialsRiverside County, CAConstruction sand and gravel328
West Coast Aggregate Supply IncWest Coast Aggregate SupplyRiverside County, CAConstruction sand and gravel1126
Maitri Canyon PlantFoster Sand & GravelRiverside County, CAConstruction sand and gravel1924
West Coast Aggregate Supply IncWest Coast Aggregate SupplyRiverside County, CAConstruction sand and gravel624
All American AggregatesAll American AggregatesRiverside County, CAConstruction sand and gravel5522

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.