Mining Incidents

Superior - Twin OaksMetal/Nonmetal

San Marcos, San Diego County, CA · Active
MSHA Mine ID: 0405514
Fatalities
0
Total incidents
8
Years on record
2005–2025
Latest incident
Apr 2025
No fatalities recorded at this mine.

Reportable incidents

8 on file

2025 · 1 incident

Over-exertion in lifting objects

On 6/17/25 employee provided a modified duty work status report from their personal doctor dated 6/12/25. On 4/25/25 employee reported a first aid from pain to their right arm while placing a wear liner into position. Employee self procured medical treatment, was diagnosed with a ruptured bicep, and restricted duty is being accommodated.

2024 · 1 incident

Fall from machine

Employee was getting on the loader and missed a step, falling backwards on their right arm/wrist.

2022 · 1 incident

Fall from ladders

Employee fell off ladder and injured finger

2021 · 1 incident

Fall from machine

Employee slipped and fell climbing from ladder to the cone crusher, injuring lower back.

2009 · 1 incident

Over-exertion (Not Elsewhere Classified)

Employee was standing and stepped to the side and twisted his knee

2007 · 1 incident

Over-exertion (Not Elsewhere Classified)

sprain of hip and thigh due to normal activity, repetitive application of break on loader.

2006 · 1 incident

Over-exertion (Not Elsewhere Classified)

Uneven ground at base of ladder, employee stepped into a pothole.

2005 · 1 incident

Struck by... (Not Elsewhere Classified)

Employee was operating plant. A rock became lodged in a conveyor belt. Employee used a pry bar and hammer to dislodge rock. Hammer struck pry bar, pry bar struck employee's finger.