Coal production
0reported short tons
ACTIVE / OPERATOR PORTFOLIO
Robertson's
Membership and operating status are from the latest MSHA Mines snapshot. Open a mine for its ownership history.
MSHA OPERATOR IDL14361
MINE PORTFOLIO
11 of 11 mines and facilities
2025-01-01 – 2026-10-13. Active records; production reporting is not required.
Material, method and type filters apply to this table. The portfolio’s status applies to the entire page. GEM fields describe their own release, not the selected MSHA year.
| Mine | Location / type | Coal · short tons | Hours worked | Violations | Accident records | On-site inspection hours |
|---|---|---|---|---|---|---|
| Banning0402815 · Active6/8 quarters reported | Riverside, CASurface · MSHA: Construction Sand and Gravel | 0 | 33,067 | 1 | 0 | 31.0 |
| Cabazon0402774 · Active6/8 quarters reported | Riverside, CASurface · MSHA: Construction Sand and Gravel | 0 | 73,434 | 2 | 1 | 30.5 |
| Corona0405887 · Active6/8 quarters reported | Riverside, CASurface · MSHA: Construction Sand and Gravel | 0 | 62,868 | 5 | 6 | 50.8 |
| El Cajon Quarry0400133 · Active6/8 quarters reported | San Diego, CASurface · MSHA: Crushed, Broken Granite | 0 | 64,118 | 12 | 0 | 46.0 |
| Jean Plant2602520 · Active6/8 quarters reported | Clark, NVSurface · MSHA: Construction Sand and Gravel | 0 | 36,349 | 10 | 0 | 41.3 |
| Juniper Flats0405097 · Active6/8 quarters reported | Riverside, CASurface · MSHA: Construction Sand and Gravel | 0 | 42,721 | 6 | 0 | 33.5 |
| Lucerne Valley0405690 · Active6/8 quarters reported | San Bernardino, CASurface · MSHA: Construction Sand and Gravel | 0 | 34,235 | 1 | 0 | 16.0 |
| Palmdale0404803 · Active6/8 quarters reported | Los Angeles, CASurface · MSHA: Construction Sand and Gravel | 0 | 35,606 | 8 | 1 | 34.5 |
| Redlands0404652 · Active6/8 quarters reported | San Bernardino, CASurface · MSHA: Construction Sand and Gravel | 0 | 30,665 | 2 | 0 | 42.5 |
| Rialto0405392 · Active6/8 quarters reported | San Bernardino, CASurface · MSHA: Construction Sand and Gravel | 0 | 62,198 | 3 | 1 | 45.3 |
| Ridgecrest Rock Plant0404163 · Active6/8 quarters reported | Kern, CASurface · MSHA: Construction Sand and Gravel | 0 | 9,969 | 2 | 0 | 18.3 |
Production and hours sum available quarterly reports. — means unavailable; zero safety records means none in the selected imported period. Ownership reflects the current MSHA record.
LOCATION
Portfolio map
11 of 11 mines with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- Banning33.94278, -116.86722Open map ↗
- Cabazon33.92250, -116.81417Open map ↗
- Corona33.82444, -117.50111Open map ↗
- El Cajon Quarry32.76472, -116.89000Open map ↗
- Jean Plant35.74417, -115.26167Open map ↗
- Juniper Flats33.76000, -117.11056Open map ↗
- Lucerne Valley34.37028, -116.86278Open map ↗
- Palmdale34.57611, -117.99583Open map ↗
- Redlands34.10083, -117.20806Open map ↗
- Rialto34.15056, -117.41833Open map ↗
- Ridgecrest Rock Plant35.77722, -117.89083Open map ↗
Quarterly trends
2025 Q1 – 2026 Q4
Database snapshot · 2026-10-13. All 11 mines listed under this operator were checked; 11 have reports in the available quarters. Totals use current ownership.
Hours worked
485,230reported employee hours
Tons per hour
0.00production ÷ hours worked
Missing values appear as —. Totals use available reports. Tons per hour requires production and hours for the same quarters and a nonzero hours total. * Striped bars mark partial mine coverage or an incomplete quarter. See the table for coverage.
Quarterly data and reporting coverage
| Quarter | Coal (short tons) | Hours worked | Tons / hour | Avg. employees | Coverage |
|---|---|---|---|---|---|
| 2025 Q1 | 0 | 77,954 | 0.00 | 134 | 11/11 mines reporting |
| 2025 Q2 | 0 | 84,109 | 0.00 | 141 | 11/11 mines reporting |
| 2025 Q3 | 0 | 84,522 | 0.00 | 137 | 11/11 mines reporting |
| 2025 Q4 | 0 | 77,040 | 0.00 | 140 | 11/11 mines reporting |
| 2026 Q1 | 0 | 77,663 | 0.00 | 137 | 11/11 mines reporting |
| 2026 Q2 | 0 | 83,942 | 0.00 | 139 | 11/11 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-13
Violations
5210 significant & substantial (S&S)
Accident records
90 records classified as fatality
Proposed penalties · USD
14,812.0051 of 52 violations with amounts
On-site inspection hours
389.5057 inspections · 57 with hours
Counts are published records, including contractor records. * The quarter was incomplete at the snapshot date; recent counts may rise as reports arrive. — means no reported amount or hours. Portfolio totals use current membership.
Quarterly safety data
| Quarter | Violations | S&S | Proposed USD | Accident records | Fatality records | Inspections | On-site hours |
|---|---|---|---|---|---|---|---|
| 2025-Q1 | 14 | 3 | 2,536.00 | 1 | 0 | 11 | 85.0 |
| 2025-Q2 | 9 | 1 | 1,393.00 | 0 | 0 | 8 | 70.3 |
| 2025-Q3 | 7 | 1 | 1,057.00 | 1 | 0 | 7 | 35.0 |
| 2025-Q4 | 6 | 0 | 906.00 | 2 | 0 | 8 | 60.0 |
| 2026-Q1 | 3 | 2 | 615.00 | 0 | 0 | 9 | 53.3 |
| 2026-Q2 | 8 | 3 | 7,701.00 | 3 | 0 | 5 | 37.5 |
| 2026-Q3 | 5 | 0 | 604.00 | 2 | 0 | 9 | 48.5 |
| 2026-Q4 * | 0 | 0 | — | 0 | 0 | 0 | — |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
Safety activity
- Cabazon · 0402774
Impoundment Spot Inspection · 1.3 on-site hours
- Cabazon · 0402774
Regular Safety and Health Inspection · 5.3 on-site hours
- Rialto · 0405392
Regular Safety and Health Inspection · 17.5 on-site hours
- Rialto · 0405392
56.14112(b)
- Corona · 0405887
HANDTOOLS (NONPOWERED) · DYS AWY FRM WRK & RESTRCTD ACT
Accident narrative
Swinging a sledgehammer on crusher bolts, felt pain in back.
- Redlands · 0404652
Regular Safety and Health Inspection · 7.5 on-site hours
- Banning · 0402815
Impoundment Spot Inspection · 1.0 on-site hours
- Palmdale · 0404803
Regular Safety and Health Inspection · 8.0 on-site hours
- Palmdale · 0404803
56.23003(b) · $151.00 proposed
- Palmdale · 0404803
56.12008 · $151.00 proposed
- Palmdale · 0404803
56.12008 · $151.00 proposed
- Corona · 0405887
MACHINERY · DAYS 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.
- Ridgecrest Rock Plant · 0404163
Regular Safety and Health Inspection · 4.0 on-site hours
- Lucerne Valley · 0405690
Regular Safety and Health Inspection · 4.0 on-site hours
- Corona · 0405887
Spot Inspection · 0.0 on-site hours
- Corona · 0405887
50.20-1 · $151.00 proposed
- El Cajon Quarry · 0400133
46.5(a) · S&S · $5,716.00 proposed
- El Cajon Quarry · 0400133
56.12004 · S&S · $1,037.00 proposed
- El Cajon Quarry · 0400133
Regular Safety and Health Inspection · 8.0 on-site hours
- Banning · 0402815
Impoundment Spot Inspection · 0.5 on-site hours
- Cabazon · 0402774
MACHINERY · NO 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.
- Palmdale · 0404803
SLIP OR FALL OF PERSON · DAYS AWAY FROM WORK ONLY
Accident narrative
Miner was exiting a shaker deck, stepped wrong and rolled R-ankle.
- Corona · 0405887
POWERED HAULAGE · DYS AWY FRM WRK & RESTRCTD ACT
Accident narrative
Miner was conducting EE's plant walk facing the sand screw, which is a noisy area due to the shaker decks above, EE stated EE heard the skid steer operating, but when EE turned to EE's left to see where it was the skid steer knocked EE off EE's feet and into the bucket, causing shin and elbow injuries.
- Juniper Flats · 0405097
Regular Safety and Health Inspection · 9.5 on-site hours
- Juniper Flats · 0405097
56.4200(b) · $151.00 proposed
Safety sources and definitions
MSHA Violations (issue date), Accidents (accident date), and Inspections (begin date). Snapshot 2026-10-13.
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.
CFR headings link to the current Title 30 index; they are not historical legal determinations.
SELECTED PORTFOLIO
1 linked controller.
Relationships reflect the selected mine status and current MSHA controller/operator fields.