RRM Development Corporation; Mitsubishi Corp safety activity
MSHA violations, accident reports and inspections across the current mine portfolio.
Safety activity
Moving machine parts.
Jean Plant · 260252030 CFR 56.14107(a)
Regular Safety and Health Inspection
Jean Plant · 26025206.8 on-site hours reported
103 (g) Written Notification Hazard Complaint Inspectio
Jean Plant · 26025203.0 on-site hours reported
Impoundment Spot Inspection
Cabazon · 04027741.3 on-site hours reported
Regular Safety and Health Inspection
Cabazon · 04027745.3 on-site hours reported
Regular Safety and Health Inspection
Rialto · 040539217.5 on-site hours reported
Construction and maintenance of guards.
Rialto · 040539230 CFR 56.14112(b)
Handtools (nonpowered)
Corona · 0405887Dys awy frm wrk & restrctd act
Accident narrative
Swinging a sledgehammer on crusher bolts, felt pain in back.
Regular Safety and Health Inspection
Redlands · 04046527.5 on-site hours reported
Impoundment Spot Inspection
Banning · 04028151.0 on-site hours reported
Regular Safety and Health Inspection
Palmdale · 04048038.0 on-site hours reported
Requirements for written safety program.
Palmdale · 040480330 CFR 56.23003(b) · $151.00 proposed penalty
Insulation and fittings for power wires and cables.
Palmdale · 040480330 CFR 56.12008 · $151.00 proposed penalty
Insulation and fittings for power wires and cables.
Palmdale · 040480330 CFR 56.12008 · $151.00 proposed penalty
Machinery
Corona · 0405887Days away from work only
Accident narrative
Miner was welding and debris came over EE's hood and into EE's left eye. Wasn't reported to management until 8/18/2026.
Regular Safety and Health Inspection
Ridgecrest Rock Plant · 04041634.0 on-site hours reported
Regular Safety and Health Inspection
Lucerne Valley · 04056904.0 on-site hours reported
Spot Inspection
Corona · 04058870.0 on-site hours reported
General instructions for completing MSHA Form 7000-1.
Corona · 040588730 CFR 50.20-1 · $151.00 proposed penalty
New miner training.
El Cajon Quarry · 040013330 CFR 46.5(a) · Significant and substantial (S&S) · $5,716.00 proposed penalty
Electrical conductors.
El Cajon Quarry · 040013330 CFR 56.12004 · Significant and substantial (S&S) · $1,037.00 proposed penalty
Regular Safety and Health Inspection
El Cajon Quarry · 04001338.0 on-site hours reported
Impoundment Spot Inspection
Banning · 04028150.5 on-site hours reported
Machinery
Cabazon · 0402774No dys awy frm wrk,no rstr act
Accident narrative
Miner was working in a conveyor head box and had set a 1-ton Lever hoist on the head pulley above EE. When EE bent over, EE's hardhat fell off and the lever hoist slid off the head pulley and struck EE in the head.
Slip or fall of person
Palmdale · 0404803Days away from work only
Accident narrative
Miner was exiting a shaker deck, stepped wrong and rolled R-ankle.
Sources and definitions
MSHA Violations (issue date), Accidents (accident date) and Inspections (begin date).
Violation titles use current CFR headings to identify the cited rule; they are not the inspector’s account of what happened.
Status is from the current MSHA Mines snapshot, not the selected reporting period. Closed records can retain their last reported controller/operator.
Counts describe published rows, including contractor records; accident records are not distinct incidents or numbers of people injured.
Zero means no matching records in the imported sources, not proof of no events. Historical coverage differs by source; absence before a source begins reporting is not a zero incident rate. Invalid or absent dates and records after the snapshot are excluded.
S&S means SIG_SUB=Y. Fatality records use DEGREE_INJURY_CD=01. Proposed penalties are not final assessed or paid amounts; missing dollar values are omitted.
Inspection hours are SUM_TOTAL_ON_SITE_HOURS attributed to the inspection start date, without supervisor/trainee hours. Missing hours are omitted; a started inspection may still be open.
Portfolio totals use current mine membership, including events before the current owner or operator's tenure.