Coal production
0reported short tons
ACTIVE / OPERATOR PORTFOLIO
CalMat Co.
Membership and operating status are from the latest MSHA Mines snapshot. Open a mine for its ownership history.
MSHA OPERATOR IDL16645
MINE PORTFOLIO
21 of 21 mines and facilities
2025-01-01 – 2026-10-18. 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 |
|---|---|---|---|---|---|---|
| Austin Quarry0405954 · Active6/8 quarters reported | Madera, CASurface · MSHA: Crushed, Broken Stone NEC | 0 | 95,619 | 1 | 0 | 35.5 |
| Chula Vista Quarry0404080 · Active6/8 quarters reported | San Diego, CASurface · MSHA: Construction Sand and Gravel | 0 | 138,215 | 6 | 0 | 55.0 |
| Corona Plant0405095 · Active6/8 quarters reported | Riverside, CASurface · MSHA: Construction Sand and Gravel | 0 | 123,552 | 2 | 0 | 57.8 |
| Durbin Plant0401734 · Active6/8 quarters reported | Los Angeles, CASurface · MSHA: Construction Sand and Gravel | 0 | 131,572 | 1 | 1 | 35.5 |
| Lake Herman Quarry0400726 · Active6/8 quarters reported | Solano, CASurface · MSHA: Crushed, Broken Stone NEC | 0 | 121,553 | 6 | 0 | 37.8 |
| LEXINGTON QUARRY0400946 · Active6/8 quarters reported | Santa Clara, CASurface · MSHA: Crushed, Broken Stone NEC | 0 | 18,380 | 1 | 1 | 36.0 |
| MARANA PLANT0202919 · Active6/8 quarters reported | Pima, AZSurface · MSHA: Construction Sand and Gravel | 0 | 62,153 | 6 | 0 | 19.8 |
| Napa Quarry0400023 · Active6/8 quarters reported | Napa, CASurface · MSHA: Sand, Industrial NEC | 0 | 52,080 | 0 | 3 | 36.3 |
| PALMDALE PLANT0402125 · Active6/8 quarters reported | Los Angeles, CASurface · MSHA: Construction Sand and Gravel | 0 | 78,483 | 2 | 0 | 39.5 |
| PENA BLANCA2901771 · Active6/8 quarters reported | Sandoval, NMSurface · MSHA: Construction Sand and Gravel | 0 | 54,291 | 3 | 1 | 39.0 |
| PLACITAS2901475 · Active6/8 quarters reported | Sandoval, NMSurface · MSHA: Construction Sand and Gravel | 0 | 49,729 | 1 | 1 | 7.0 |
| Pleasanton Plant0401924 · Active6/8 quarters reported | Alameda, CASurface · MSHA: Construction Sand and Gravel | 0 | 180,146 | 10 | 1 | 102.5 |
| Queen Creek Stone0203342 · Active6/8 quarters reported | Pinal, AZSurface · MSHA: Construction Sand and Gravel | 0 | 54,420 | 0 | 0 | 18.3 |
| RELIANCE PLANT0403200 · Active6/8 quarters reported | Los Angeles, CASurface · MSHA: Construction Sand and Gravel | 0 | 104,871 | 0 | 0 | 32.3 |
| San Bernardino Plant0401984 · Active6/8 quarters reported | San Bernardino, CASurface · MSHA: Construction Sand and Gravel | 0 | 127,951 | 3 | 1 | 51.8 |
| San Emidio Plant0401800 · Active6/8 quarters reported | Kern, CASurface · MSHA: Construction Sand and Gravel | 0 | 96,258 | 11 | 0 | 104.3 |
| Sanger Plant0401937 · Active6/8 quarters reported | Fresno, CASurface · MSHA: Construction Sand and Gravel | 0 | 83,697 | 4 | 1 | 59.5 |
| SUN CITY PLANT0200632 · Active6/8 quarters reported | Maricopa, AZSurface · MSHA: Construction Sand and Gravel | 0 | 80,275 | 2 | 0 | 37.8 |
| VAL VISTA - CITRUS GROVE 1500202891 · Active6/8 quarters reported | Maricopa, AZSurface · MSHA: Construction Sand and Gravel | 0 | 25,047 | 0 | 0 | 17.3 |
| West Broadway0202261 · Active6/8 quarters reported | Maricopa, AZSurface · MSHA: Construction Sand and Gravel | 0 | 161,468 | 6 | 0 | 56.8 |
| West Plant0202166 · Active6/8 quarters reported | Maricopa, AZSurface · MSHA: Construction Sand and Gravel | 0 | 108,000 | 3 | 0 | 24.5 |
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
21 of 21 mines with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- Austin Quarry37.01056, -119.85778Open map ↗
- Chula Vista Quarry32.59000, -116.99389Open map ↗
- Corona Plant33.86028, -117.52333Open map ↗
- Durbin Plant34.09194, -117.98806Open map ↗
- Lake Herman Quarry38.11722, -122.18111Open map ↗
- LEXINGTON QUARRY37.20056, -121.98139Open map ↗
- MARANA PLANT32.40361, -111.17833Open map ↗
- Napa Quarry38.26194, -122.27583Open map ↗
- PALMDALE PLANT34.54333, -118.00750Open map ↗
- PENA BLANCA35.58917, -106.32472Open map ↗
- PLACITAS35.28472, -106.55083Open map ↗
- Pleasanton Plant37.67667, -121.82694Open map ↗
- Queen Creek Stone33.09944, -111.47111Open map ↗
- RELIANCE PLANT34.13361, -117.93167Open map ↗
- San Bernardino Plant34.13611, -117.34444Open map ↗
- San Emidio Plant35.04472, -119.17778Open map ↗
- Sanger Plant36.72778, -119.48306Open map ↗
- SUN CITY PLANT33.61472, -112.30722Open map ↗
- VAL VISTA - CITRUS GROVE 15033.47556, -111.75778Open map ↗
- West Broadway33.40833, -112.22778Open map ↗
- West Plant33.40222, -112.15944Open map ↗
Quarterly trends
2025 Q1 – 2026 Q4
Database snapshot · 2026-10-18. All 21 mines listed under this operator were checked; 21 have reports in the available quarters. Totals use current ownership.
Hours worked
1,947,760reported 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 | 321,818 | 0.00 | 609 | 21/21 mines reporting |
| 2025 Q2 | 0 | 339,538 | 0.00 | 615 | 21/21 mines reporting |
| 2025 Q3 | 0 | 336,074 | 0.00 | 617 | 21/21 mines reporting |
| 2025 Q4 | 0 | 292,492 | 0.00 | 621 | 21/21 mines reporting |
| 2026 Q1 | 0 | 321,773 | 0.00 | 632 | 21/21 mines reporting |
| 2026 Q2 | 0 | 336,065 | 0.00 | 638 | 21/21 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-18
Violations
688 significant & substantial (S&S)
Accident records
100 records classified as fatality
Proposed penalties · USD
15,845.0067 of 68 violations with amounts
On-site inspection hours
903.75113 inspections · 113 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 | 8 | 0 | 3,560.00 | 1 | 0 | 11 | 101.3 |
| 2025-Q2 | 15 | 2 | 2,755.00 | 2 | 0 | 19 | 160.8 |
| 2025-Q3 | 13 | 3 | 4,128.00 | 1 | 0 | 16 | 129.3 |
| 2025-Q4 | 4 | 0 | 604.00 | 1 | 0 | 11 | 90.5 |
| 2026-Q1 | 9 | 0 | 1,373.00 | 0 | 0 | 17 | 138.0 |
| 2026-Q2 | 9 | 1 | 1,636.00 | 3 | 0 | 14 | 116.5 |
| 2026-Q3 | 10 | 2 | 1,789.00 | 2 | 0 | 21 | 154.5 |
| 2026-Q4 * | 0 | 0 | — | 0 | 0 | 4 | 13.0 |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
Safety activity
- Napa Quarry · 0400023
Spot Inspection · 9.5 on-site hours
- Pleasanton Plant · 0401924
Spot Inspection · 4.5 on-site hours
- RELIANCE PLANT · 0403200
Regular Safety and Health Inspection · 11.3 on-site hours
- Lake Herman Quarry · 0400726
Special Emphasis Programs · 1.8 on-site hours
- San Emidio Plant · 0401800
56.14132(a) · S&S · $366.00 proposed
- San Emidio Plant · 0401800
56.14100(a) · S&S · $818.00 proposed
- San Emidio Plant · 0401800
56.14207 · $151.00 proposed
- San Emidio Plant · 0401800
56.4430(b) · $151.00 proposed
- San Emidio Plant · 0401800
56.12004 · $151.00 proposed
- San Emidio Plant · 0401800
Regular Safety and Health Inspection · 29.0 on-site hours
- Napa Quarry · 0400023
103 (g) Written Notification Hazard Complaint Inspectio · 3.5 on-site hours
- LEXINGTON QUARRY · 0400946
46.7(a) · $168.00 proposed
- VAL VISTA - CITRUS GROVE 150 · 0202891
Regular Safety and Health Inspection · 3.3 on-site hours
- LEXINGTON QUARRY · 0400946
Regular Safety and Health Inspection · 6.3 on-site hours
- San Emidio Plant · 0401800
Impoundment Spot Inspection · 1.5 on-site hours
- Durbin Plant · 0401734
SLIP OR FALL OF PERSON · DAYS RESTRICTED ACTIVITY ONLY
Accident narrative
On 6/13/25 employee received medical treatment in ER for a reopening of a surgical incision. While employee was inspecting a trench, the tripped on leveling rake and fell on right knee, reopening a surgical incision from a personal knee surgery. Employee required surgery, was released from the hospital on 6/15/25, placed on restricted duty on 6/16/25 which is being accommodated
- PALMDALE PLANT · 0402125
Impoundment Spot Inspection · 1.0 on-site hours
- PLACITAS · 2901475
HANDLING OF MATERIALS · DAYS RESTRICTED ACTIVITY ONLY
Accident narrative
On 05-29-25 employee alleges a strain to the left lower back when operating a CAT 769D haul truck. EE states that the initial left lower back strain occurred on 05-28-25. While the employee was attempting to move a pallet with a pallet jack. On 05-30-25 employee was treated by a MD for a strain to the left lower back, resulting in modified work activity.
- Lake Herman Quarry · 0400726
46.7(a) · $168.00 proposed
- Lake Herman Quarry · 0400726
47.41(a)(1) · $151.00 proposed
- Lake Herman Quarry · 0400726
Regular Safety and Health Inspection · 11.5 on-site hours
- Sanger Plant · 0401937
Spot Inspection · 3.0 on-site hours
- Pleasanton Plant · 0401924
Impoundment Spot Inspection · 6.0 on-site hours
- Chula Vista Quarry · 0404080
56.14112(a)(1) · $366.00 proposed
- Chula Vista Quarry · 0404080
56.12038 · $151.00 proposed
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.