Data / Mines / Texas / Medina County
Mines in Medina County, Texas: 11 open mines
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
MSHA lists 11 open mines in Medina County, Texas, run by 9 operators and employing 138 people. Since January 1, 2022 its inspectors issued 206 citations and orders there with $66,799 in proposed penalties, and operators reported 18 injury or illness cases. The operators with the most open mines are Martin Marietta Materials Southwest, LLC; Vulcan Construction Materials, LLC; Ace Aggregates, LLC. Data from MSHA, November 6, 2026.
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- Open mines
- 11
- Operators
- 9
- Employees
- 138
- Active
- 9
- New Mine
- 1
- Intermittent
- 1
- Citations and orders since January 1, 2022
- 206
- Significant and substantial
- 35 (17.0%)
- Closure orders
- 6
- High negligence or reckless
- 17
- Proposed penalties
- $66,799
- Amount paid so far
- $65,532
- Inspections
- 121
- Inspector hours on site
- 1,235
- Citations per inspection
- 1.70 (all mines 2.30)
- Accident reports
- 20
- Injury and illness cases
- 18
- Fatalities
- 0
- Latest MSHA record
- October 22, 2026
Operators with the most open mines in Medina County, Texas
Ranked by open mines, then by citations. Sole proprietors and individuals are not listed.
| Operator | Open mines | Employees | Citations since 2022 | Proposed penalties | Injury cases |
|---|---|---|---|---|---|
| Martin Marietta Materials Southwest, LLC | 2 | 69 | 33 | $5,898 | 6 |
| Vulcan Construction Materials, LLC | 2 | 28 | 21 | $3,432 | 4 |
| Ace Aggregates, LLC | 1 | 5 | 55 | $39,034 | 5 |
| H.L. Zumwalt Quarry Operations | 1 | 10 | 39 | $8,607 | 0 |
| NM Energy LLC | 1 | 11 | 24 | $4,224 | 0 |
| Medina Aggregates, LLC | 1 | 2 | 21 | $3,159 | 1 |
| Capitol Aggregates, Inc. | 1 | 5 | 13 | $2,445 | 2 |
| Cuatro T Construction | 1 | 5 | 0 | $0 | 0 |
| Madden Materials | 1 | 3 | 0 | $0 | 0 |
Operators with the most citations in Medina County, Texas
Citations and orders issued since January 1, 2022 at their open mines here.
| Operator | Open mines | Employees | Citations since 2022 | Proposed penalties | Injury cases |
|---|---|---|---|---|---|
| Ace Aggregates, LLC | 1 | 5 | 55 | $39,034 | 5 |
| H.L. Zumwalt Quarry Operations | 1 | 10 | 39 | $8,607 | 0 |
| Martin Marietta Materials Southwest, LLC | 2 | 69 | 33 | $5,898 | 6 |
| NM Energy LLC | 1 | 11 | 24 | $4,224 | 0 |
| Vulcan Construction Materials, LLC | 2 | 28 | 21 | $3,432 | 4 |
| Medina Aggregates, LLC | 1 | 2 | 21 | $3,159 | 1 |
| Capitol Aggregates, Inc. | 1 | 5 | 13 | $2,445 | 2 |
| Cuatro T Construction | 1 | 5 | 0 | $0 | 0 |
| Madden Materials | 1 | 3 | 0 | $0 | 0 |
Mines with the most citations
Open mines, ranked by citations and orders since January 1, 2022.
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Cobey Hollow Stone- Mico | Ace Aggregates, LLC | Medina County, TX | Crushed, broken limestone | 5 | 55 |
| FM 1283 | H.L. Zumwalt Quarry Operations | Medina County, TX | Crushed, broken limestone | 10 | 39 |
| Hondo Plant | NM Energy LLC | Medina County, TX | Dimension limestone | 11 | 24 |
| 711 Quarry | Medina Aggregates, LLC | Medina County, TX | Crushed, broken limestone | 2 | 21 |
| Medina Rock & Rail | Martin Marietta Materials Southwest, LLC | Medina County, TX | Crushed, broken limestone | 48 | 17 |
| Rio Medina | Martin Marietta Materials Southwest, LLC | Medina County, TX | Crushed, broken limestone | 21 | 16 |
| Rio Medina Operations | Capitol Aggregates, Inc. | Medina County, TX | Crushed, broken limestone | 5 | 13 |
| Mico Quarry | Vulcan Construction Materials, LLC | Medina County, TX | Crushed, broken stone | 16 | 12 |
| Medina Quarry | Vulcan Construction Materials, LLC | Medina County, TX | Crushed, broken limestone | 12 | 9 |
| 341 Pit | Cuatro T Construction | Medina County, TX | Crushed, broken limestone | 5 | 0 |
| Jarco Aggregates Castroville Pit | Madden Materials | Medina County, TX | Construction sand and gravel | 3 | 0 |
Main commodities
| Main commodity | Open mines | Share |
|---|---|---|
| Crushed, broken limestone | 8 | 72.7% |
| Crushed, broken stone | 1 | 9.1% |
| Dimension limestone | 1 | 9.1% |
| Construction sand and gravel | 1 | 9.1% |
Citations and injury cases by year
Calendar years since 2022; 2026 runs to the date of the MSHA files.
| Year | Citations and orders | Significant and substantial | Proposed penalties | Injury and illness cases |
|---|---|---|---|---|
| 2022 | 55 | 9 | $9,562 | 3 |
| 2023 | 24 | 4 | $11,102 | 7 |
| 2024 | 69 | 10 | $28,862 | 5 |
| 2025 | 33 | 5 | $12,688 | 2 |
| 2026 | 25 | 7 | $4,585 | 1 |
Standards cited most at mines in Medina County, Texas
Sections of Title 30 of the Code of Federal Regulations named on the citations, with the part each belongs to.
| Standard | What the part covers | Citations |
|---|---|---|
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 31 |
| 30 CFR 56.12008 | Surface metal and nonmetal mines | 14 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 12 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 9 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 9 |
| 30 CFR 56.12004 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.12018 | Surface metal and nonmetal mines | 7 |
| 30 CFR 56.14207 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.18002 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.14101 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 5 |
| 30 CFR 50.30 | Reporting of accidents, injuries and illnesses | 5 |
| 30 CFR 56.9300 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 3 |
Injury and illness cases at mines in Medina County, Texas
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Permanent disability | 1 |
| Days away from work or restricted activity | 11 |
| No lost time, or an occupational illness | 6 |
What the accident reports at mines in Medina County, Texas describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Handling of materials | 5 |
| Slip or fall of person | 5 |
| Machinery | 4 |
| Handtools (nonpowered) | 2 |
| Disorders (physical agents) | 2 |
| Other | 1 |
| Fire | 1 |
Equipment named in accident reports at mines in Medina County, Texas
| Equipment | Reports |
|---|---|
| Hand tools (powered) | 3 |
| Front-end loader | 3 |
| Hand tools (not powered) | 2 |
| Impactor | 1 |
| Bulldozer | 1 |
| Shovel | 1 |
US government work, public domain. Counts come from the MSHA files published on November 6, 2026. An open mine is one MSHA lists as Active, Intermittent, New Mine, Temporarily Idled or NonProducing; 13,673 were open that day. Citations, penalties, inspections and accident reports run from January 1, 2022. A citation is an inspector's allegation and an operator can contest it; the penalty is the amount MSHA first proposed, before any contest or settlement. An operator is the legal entity MSHA assesses, and a parent company is its controller. Mines run by sole proprietors or by individuals are counted in every total and are not named. This page uses MSHA data and is not endorsed or certified by MSHA. Free to reuse with credit to SpecStream under CC BY 4.0. Spot a wrong value? Write to [email protected] with the link to this page.