Mercer Stone Company operator
Controlled by
Mark Mathis
MSHA operator ID: L04518
- Fatalities
- 0
- Total incidents
- 13
- Mines on record
- 1
- Years on record
- 1983–2025
Compliance record
MSHA citations since 2000
116
citations
35
significant & substantial
$19,515
proposed penalties
$19,515
paid to date
100% of proposed penalties paid to date, a $0 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2000
79
inspections on record
1,637
inspection hours
7.1
citations per 100 inspection hours
ⓘ
This rate is recorded citations divided by MSHA inspection hours, per 100 hours. It reflects inspection effort, not mine size or production.116 citations across 1,637 inspection hours.
Source: MSHA inspections data, updated weekly.
Penalty disposition
ⓘ
Differences between proposed and paid penalties reflect both settlements and conference reductions and amounts still owed. Outstanding is the balance currently owed.$20K
proposed penalties
$20K
current assessed
$20K
paid to date
$0
outstanding
114 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2025-10-14.
Source: MSHA assessed-violations and conference/litigation data, updated weekly.
Top causes
- HANDTOOLS (NONPOWERED) 4 non-fatal
- SLIP OR FALL OF PERSON 4 non-fatal
- MACHINERY 2 non-fatal
- OTHER 2 non-fatal
- DUST DISEASE OF LUNGS 1 non-fatal
Incident timeline
2025
1
2022
2
2011
1
1998
1
1995
1
1991
1
1988
1
1987
1
1986
2
1985
1
1983
1
Mines on record
Watch this operator
Email me when a new MSHA incident is filed at any Mercer Stone Company mine.
For insurers, brokers, and safety consultants
The full compliance file on Mercer Stone Company
A dated report covering the 26-year penalty trail, line-item violation pattern, contest and docket posture, rate-normalized peer benchmark, and full fatality history. Delivered as a PDF with the underlying data as CSV.