Coal production
0reported short tons
ALL STATUSES / OPERATOR PORTFOLIO
Superior Ready Mix Concrete L.P.
Membership and operating status are from the latest MSHA Mines snapshot. Open a mine for its ownership history.
MSHA OPERATOR IDL10579
MINE PORTFOLIO
13 of 13 mines and facilities
2025-01-01 – 2026-10-18. All statuses 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 |
|---|---|---|---|---|---|---|
| DILLON ROAD PIT0404937 · Active6/8 quarters reported | Riverside, CASurface · MSHA: Construction Sand and Gravel | 0 | 27,363 | 8 | 0 | 35.5 |
| Frink Pit0401910 · Intermittent6/8 quarters reported | Imperial, CASurface · MSHA: Construction Sand and Gravel | 0 | 5,418 | 0 | 0 | 11.5 |
| MISSION GORGE PLANT0400089 · Active6/8 quarters reported | San Diego, CASurface · MSHA: Construction Sand and Gravel | 0 | 70,741 | 16 | 0 | 48.5 |
| Superior - Twin Oaks0405514 · Active6/8 quarters reported | San Diego, CASurface · MSHA: Crushed, Broken Stone NEC | 0 | 33,230 | 6 | 1 | 42.0 |
| EL CENTRO PROCESSING0405142 · Abandoned3/8 quarters reported | Imperial, CASurface · MSHA: Construction Sand and Gravel | 0 | 0 | 3 | 0 | 4.0 |
| JAMACHA QUARRY0400135 · Abandoned4/8 quarters reported | San Diego, CASurface · MSHA: Construction Sand and Gravel | 0 | 12,704 | 11 | 1 | 24.3 |
| La Posta Sand Plant0404947 · Abandoned | San Diego, CASurface · MSHA: Construction Sand and Gravel | — | — | 0 | 0 | — |
| Mine #10404843 · Abandoned | San Diego, CASurface · MSHA: Crushed, Broken Granite | — | — | 0 | 0 | — |
| National Quarries0400204 · Abandoned | San Diego, CASurface · MSHA: Dimension Granite | — | — | 0 | 0 | — |
| Oat Pit0405082 · Abandoned3/8 quarters reported | Imperial, CASurface · MSHA: Construction Sand and Gravel | 0 | 0 | 2 | 0 | 7.8 |
| San Pasqual Quarry0405717 · Abandoned | San Diego, CASurface · MSHA: Sand, Industrial NEC | — | — | 0 | 0 | — |
| VISTA SAND WASHING PLANT0404334 · Abandoned | San Diego, CASurface · MSHA: Construction Sand and Gravel | — | — | 0 | 0 | — |
| Willow Springs Mine0405490 · Abandoned | San Diego, CASurface · MSHA: Construction Sand and Gravel | — | — | 0 | 0 | — |
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 13 mines with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- DILLON ROAD PIT33.79139, -116.18833Open map ↗
- Frink Pit33.37361, -115.64472Open map ↗
- MISSION GORGE PLANT32.80861, -117.07806Open map ↗
- Superior - Twin Oaks33.23083, -117.18111Open map ↗
- EL CENTRO PROCESSING32.79278, -115.53111Open map ↗
- JAMACHA QUARRY32.76139, -116.92778Open map ↗
- Mine #132.90639, -116.94333Open map ↗
- National Quarries33.17972, -117.15722Open map ↗
- Oat Pit32.90833, -115.28750Open map ↗
- San Pasqual Quarry33.09889, -117.02722Open map ↗
- Willow Springs Mine32.87448, -116.92296Open map ↗
Quarterly trends
2025 Q1 – 2026 Q4
Database snapshot · 2026-10-18. All 13 mines listed under this operator were checked; 7 have reports in the available quarters. Totals use current ownership.
Hours worked
149,456reported 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 | 31,916 | 0.00 | 64 | 7/7 mines reporting |
| 2025 Q2 | 0 | 29,504 | 0.00 | 59 | 7/7 mines reporting |
| 2025 Q3 | 0 | 23,887 | 0.00 | 49 | 7/7 mines reporting |
| 2025 Q4 | 0 | 19,696 | 0.00 | 47 | 5/7 mines reporting |
| 2026 Q1 | 0 | 22,517 | 0.00 | 70 | 4/7 mines reporting |
| 2026 Q2 | 0 | 21,936 | 0.00 | 49 | 4/7 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-18
Violations
467 significant & substantial (S&S)
Accident records
20 records classified as fatality
Proposed penalties · USD
30,543.0046 of 46 violations with amounts
On-site inspection hours
173.5018 inspections · 18 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 | 4 | 3,059.00 | 0 | 0 | 5 | 48.5 |
| 2025-Q2 | 23 | 3 | 19,675.00 | 1 | 0 | 4 | 47.8 |
| 2025-Q3 | 0 | 0 | — | 1 | 0 | 0 | — |
| 2025-Q4 | 3 | 0 | 495.00 | 0 | 0 | 3 | 15.5 |
| 2026-Q1 | 2 | 0 | 452.00 | 0 | 0 | 2 | 22.0 |
| 2026-Q2 | 4 | 0 | 6,862.00 | 0 | 0 | 3 | 31.8 |
| 2026-Q3 | 0 | 0 | — | 0 | 0 | 1 | 8.0 |
| 2026-Q4 * | 0 | 0 | — | 0 | 0 | 0 | — |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
Safety activity
- EL CENTRO PROCESSING · 0405142
56.12032 · S&S · $151.00 proposed
- EL CENTRO PROCESSING · 0405142
56.14112(a)(1) · $151.00 proposed
- EL CENTRO PROCESSING · 0405142
56.12018 · $151.00 proposed
- EL CENTRO PROCESSING · 0405142
Regular Safety and Health Inspection · 4.0 on-site hours
- JAMACHA QUARRY · 0400135
46.7(a) · S&S · $252.00 proposed
- JAMACHA QUARRY · 0400135
56.9300(a) · S&S · $504.00 proposed
- JAMACHA QUARRY · 0400135
56.9300(b) · $151.00 proposed
- JAMACHA QUARRY · 0400135
56.16001 · $151.00 proposed
- JAMACHA QUARRY · 0400135
56.14201(b) · $151.00 proposed
- JAMACHA QUARRY · 0400135
56.20003(a) · S&S · $151.00 proposed
- JAMACHA QUARRY · 0400135
56.14206(b) · $151.00 proposed
- JAMACHA QUARRY · 0400135
56.4430(a)(3) · $151.00 proposed
- JAMACHA QUARRY · 0400135
Regular Safety and Health Inspection · 16.3 on-site hours
- Superior - Twin Oaks · 0405514
56.12018 · $642.00 proposed
- Frink Pit · 0401910
Regular Safety and Health Inspection · 6.5 on-site hours
- Superior - Twin Oaks · 0405514
Regular Safety and Health Inspection · 14.0 on-site hours
Safety sources and definitions
MSHA Violations (issue date), Accidents (accident date), and Inspections (begin date). Snapshot 2026-10-18.
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.