Coal production
0reported short tons
ACTIVE / OPERATOR PORTFOLIO
Martin Marietta Materials Southwest LLC
Membership and operating status are from the latest MSHA Mines snapshot. Open a mine for its ownership history.
MSHA OPERATOR ID0084984
MINE PORTFOLIO
23 of 23 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 |
|---|---|---|---|---|---|---|
| 211 QUARRY4103829 · Active6/8 quarters reported | Bexar, TXSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 20,983 | 1 | 0 | 26.0 |
| Beckmann Quarry4101335 · Active6/8 quarters reported | Bexar, TXSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 164,072 | 11 | 1 | 94.3 |
| Bedrock Plant4103283 · Active6/8 quarters reported | Kerr, TXSurface · MSHA: Construction Sand and Gravel | 0 | 26,550 | 1 | 0 | 30.5 |
| Bells/Savoy Aggregate Operations4104019 · Active6/8 quarters reported | Fannin, TXSurface · MSHA: Construction Sand and Gravel | 0 | 73,554 | 13 | 1 | 62.5 |
| Black Spur Quarry4104159 · Active6/8 quarters reported | Uvalde, TXSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 92,958 | 2 | 0 | 62.3 |
| Bridgeport Stone Plant4100007 · Active6/8 quarters reported | Wise, TXSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 226,416 | 15 | 1 | 150.3 |
| Garfield Sand & Gravel4103909 · Active6/8 quarters reported | Travis, TXSurface · MSHA: Construction Sand and Gravel | 0 | 27,065 | 6 | 0 | 27.0 |
| GARWOOD PLANT4102886 · Active6/8 quarters reported | Colorado, TXSurface · MSHA: Construction Sand and Gravel | 0 | 109,108 | 6 | 1 | 48.5 |
| Hunter Stone4105230 · Active6/8 quarters reported | Comal, TXSurface · MSHA: Crushed, Broken Stone NEC | 0 | 99,309 | 2 | 1 | 41.8 |
| Martin Marietta Merkel Plant4103848 · Active6/8 quarters reported | Jones, TXSurface · MSHA: Construction Sand and Gravel | 0 | 99,643 | 14 | 1 | 44.8 |
| Martin Marietta Slaton Plant4101111 · Active6/8 quarters reported | Crosby, TXSurface · MSHA: Construction Sand and Gravel | 0 | 102,373 | 10 | 1 | 53.3 |
| Medina Rock & Rail4105170 · Active6/8 quarters reported | Medina, TXSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 188,134 | 5 | 1 | 123.0 |
| Mill Creek Limestone Quarry3401859 · Active6/8 quarters reported | Johnston, OKSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 207,382 | 30 | 0 | 83.5 |
| North Austin Quarry4104380 · Active6/8 quarters reported | Williamson, TXSurface · MSHA: Construction Sand and Gravel | 0 | 21,450 | 4 | 0 | 35.0 |
| NORTH BRIDGEPORT QUARRY4103360 · Active6/8 quarters reported | Wise, TXSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 300,198 | 15 | 1 | 134.8 |
| Perryville Aggregates Plant #21601417 · Active6/8 quarters reported | Morehouse, LASurface · MSHA: Construction Sand and Gravel | 0 | 14,904 | 3 | 0 | 17.8 |
| Portable Crusher #24104204 · Active6/8 quarters reported | Hidalgo, TXSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 23,744 | 2 | 0 | 29.8 |
| Poteet Sand Plant4101342 · Active6/8 quarters reported | Atascosa, TXSurface · MSHA: Construction Sand and Gravel | 0 | 31,516 | 0 | 0 | 14.5 |
| Rio Medina4103594 · Active6/8 quarters reported | Medina, TXSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 67,264 | 6 | 0 | 26.8 |
| San Pedro Quarry4101337 · Active6/8 quarters reported | Bexar, TXSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 39,631 | 2 | 0 | 19.3 |
| Smithson Valley Quarry4104108 · Active6/8 quarters reported | Bexar, TXSurface · MSHA: Construction Sand and Gravel | 0 | 12,020 | 2 | 0 | 15.5 |
| TIN TOP SAND AND GRAVEL PLANT4102852 · Active6/8 quarters reported | Parker, TXSurface · MSHA: Construction Sand and Gravel | 0 | 30,682 | 8 | 0 | 31.0 |
| Webberville S&G4104363 · Active6/8 quarters reported | Travis, TXSurface · MSHA: Construction Sand and Gravel | 0 | 75,427 | 10 | 0 | 54.0 |
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
23 of 23 mines with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- 211 QUARRY29.55500, -98.80194Open map ↗
- Beckmann Quarry29.60694, -98.57722Open map ↗
- Bedrock Plant29.91806, -99.03500Open map ↗
- Bells/Savoy Aggregate Operations33.68306, -96.33250Open map ↗
- Black Spur Quarry29.18861, -100.03139Open map ↗
- Bridgeport Stone Plant33.21000, -97.75472Open map ↗
- Garfield Sand & Gravel30.19417, -97.58222Open map ↗
- GARWOOD PLANT29.85472, -96.72694Open map ↗
- Hunter Stone29.79750, -98.03917Open map ↗
- Martin Marietta Merkel Plant32.47056, -100.01278Open map ↗
- Martin Marietta Slaton Plant33.43722, -101.64361Open map ↗
- Medina Rock & Rail29.38861, -99.24389Open map ↗
- Mill Creek Limestone Quarry34.40417, -96.82639Open map ↗
- North Austin Quarry30.73722, -97.67056Open map ↗
- NORTH BRIDGEPORT QUARRY33.29722, -97.80917Open map ↗
- Perryville Aggregates Plant #232.75611, -91.87222Open map ↗
- Portable Crusher #226.46389, -98.15917Open map ↗
- Poteet Sand Plant29.22556, -98.58444Open map ↗
- Rio Medina29.53750, -98.87194Open map ↗
- San Pedro Quarry29.62028, -98.46556Open map ↗
- Smithson Valley Quarry29.72944, -98.39750Open map ↗
- TIN TOP SAND AND GRAVEL PLANT32.58722, -97.81750Open map ↗
- Webberville S&G30.24750, -97.52139Open map ↗
Quarterly trends
2025 Q1 – 2026 Q4
Database snapshot · 2026-10-18. All 23 mines listed under this operator were checked; 23 have reports in the available quarters. Totals use current ownership.
Hours worked
2,054,383reported 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 | 342,386 | 0.00 | 615 | 23/23 mines reporting |
| 2025 Q2 | 0 | 390,138 | 0.00 | 629 | 23/23 mines reporting |
| 2025 Q3 | 0 | 289,529 | 0.00 | 626 | 23/23 mines reporting |
| 2025 Q4 | 0 | 314,561 | 0.00 | 618 | 23/23 mines reporting |
| 2026 Q1 | 0 | 356,474 | 0.00 | 616 | 23/23 mines reporting |
| 2026 Q2 | 0 | 361,295 | 0.00 | 603 | 23/23 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-18
Violations
1686 significant & substantial (S&S)
Accident records
90 records classified as fatality
Proposed penalties · USD
28,321.00153 of 168 violations with amounts
On-site inspection hours
1,225.7598 inspections · 98 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 | 26 | 2 | 4,683.00 | 0 | 0 | 18 | 230.3 |
| 2025-Q2 | 42 | 0 | 7,218.00 | 0 | 0 | 17 | 198.3 |
| 2025-Q3 | 12 | 1 | 2,532.00 | 3 | 0 | 10 | 155.8 |
| 2025-Q4 | 47 | 1 | 9,513.00 | 3 | 0 | 18 | 235.0 |
| 2026-Q1 | 5 | 0 | 943.00 | 2 | 0 | 8 | 106.5 |
| 2026-Q2 | 14 | 0 | 1,963.00 | 0 | 0 | 18 | 153.8 |
| 2026-Q3 | 18 | 2 | 1,469.00 | 1 | 0 | 8 | 136.8 |
| 2026-Q4 * | 4 | 0 | — | 0 | 0 | 1 | 9.5 |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
Safety activity
- NORTH BRIDGEPORT QUARRY · 4103360
56.14207 · $151.00 proposed
- Mill Creek Limestone Quarry · 3401859
56.23002(a) · $151.00 proposed
- Mill Creek Limestone Quarry · 3401859
46.3(a) · $151.00 proposed
- Mill Creek Limestone Quarry · 3401859
50.30(a) · $151.00 proposed
- Mill Creek Limestone Quarry · 3401859
50.30(a) · $151.00 proposed
- Mill Creek Limestone Quarry · 3401859
50.30(a) · $151.00 proposed
- Mill Creek Limestone Quarry · 3401859
50.30(a) · $151.00 proposed
- Mill Creek Limestone Quarry · 3401859
56.14132(a) · S&S · $2,133.00 proposed
- Mill Creek Limestone Quarry · 3401859
56.14100(b) · $151.00 proposed
- Mill Creek Limestone Quarry · 3401859
56.14112(a)(1) · $151.00 proposed
- Mill Creek Limestone Quarry · 3401859
56.11003 · $151.00 proposed
- NORTH BRIDGEPORT QUARRY · 4103360
56.14112(b) · $151.00 proposed
- NORTH BRIDGEPORT QUARRY · 4103360
56.12004 · $151.00 proposed
- NORTH BRIDGEPORT QUARRY · 4103360
56.14100(b) · $151.00 proposed
- NORTH BRIDGEPORT QUARRY · 4103360
56.14100(b) · $151.00 proposed
- Mill Creek Limestone Quarry · 3401859
Regular Safety and Health Inspection · 24.0 on-site hours
- NORTH BRIDGEPORT QUARRY · 4103360
Regular Safety and Health Inspection · 45.5 on-site hours
- Mill Creek Limestone Quarry · 3401859
56.4101 · $151.00 proposed
- Mill Creek Limestone Quarry · 3401859
56.4201(a)(1) · $151.00 proposed
- NORTH BRIDGEPORT QUARRY · 4103360
56.12032 · $151.00 proposed
- San Pedro Quarry · 4101337
Regular Safety and Health Inspection · 5.0 on-site hours
- Bedrock Plant · 4103283
Verbal Hazard Complaint Inspections · 7.0 on-site hours
- Bridgeport Stone Plant · 4100007
Spot Inspection · 12.0 on-site hours
- Martin Marietta Merkel Plant · 4103848
Verbal Hazard Complaint Inspections · 4.0 on-site hours
- Bells/Savoy Aggregate Operations · 4104019
Special Emphasis Programs · 0.3 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.