Mining Incidents

Rio Medina Metal/Non-Metal

San Antonio, Medina County, TX  ·  Active
MSHA Mine ID: 4103594

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Fatalities
0
Total incidents
6
Years on record
2005–2024
Latest incident
Apr 2024
Compliance record
MSHA citations since 2000
159
citations
38
significant & substantial
$50,721
proposed penalties
$50,350
paid to date
Source: MSHA violations data, updated weekly.
Quarterly safety rates
Citations per million employee-hours, as reported to MSHA
Quarter Hours worked Citations S&S Per 1M hrs
2025 Q4 9,867 5 0 506.7
2025 Q3 1,449 0 0 0.0
2025 Q2 1,873 0 0 0.0
2024 Q4 1,635 3 0 1834.9
2024 Q3 1,623 1 0 616.1
2024 Q1 13,131 0 0 0.0
2023 Q4 2,174 0 0 0.0
2023 Q3 14,398 5 2 347.3
Quarters under 100,000 reported hours are greyed: too few hours for a stable rate.
No fatalities recorded at this mine.

Reportable incidents

6 on file

2024 · 1 incident

April 12, 2024 TX · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
Martin Marietta Materials Southwest LLC · Caught in, under or between a moving and a stationary object

EE was moving a large rock, rock slipped, EE moved to grab it and EE's thumb was smashed between the rock and loader frame. EE received a fracture to tip of right thumb and received 7 stitches.

2023 · 2 incidents

July 10, 2023 TX · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDLING OF MATERIALS
Martin Marietta Materials Southwest LLC · Over-exertion in lifting objects

EE was moving rock from choked crusher. Rock was in front of EE and EE tried to adjust it. EE heard shoulder pop and then felt intense pain.

February 9, 2023 TX · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech MACHINERY
Martin Marietta Materials Southwest LLC · Struck by... (Not Elsewhere Classified)

EE was holding counter sunk bolt up in position while using impact to loosen nut, impact caused bolt to turn cutting palm of EE left hand.

2022 · 1 incident

2019 · 1 incident

October 11, 2019 TX · Metal/Non-Metal miner, prospector, nec HANDLING OF MATERIALS
Martin Marietta Materials Southwest LLC · Caught in, under or between a moving and a stationary object

EE1 opened clogged crusher, entered and began removing larger rocks through the crusher door. EE2 was on the platform outside moving rocks from the door over the edge of the platform to the ground. A rock shifted and pinched EE2 finger against the steel crusher door.

2005 · 1 incident

November 10, 2005 TX · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDTOOLS (NONPOWERED)
Medina Crushed Stone Inc. · Struck by... (Not Elsewhere Classified)

Employee was holding a hammer pin when another employee was driving the pin in with a sledge hammer. The co-worker missed the pin and struck injured on the hand with hammer.