Diamond Materials, LLC operator
Controlled by
Richard E Pierson Jr; Michael K Pierson
MSHA operator ID: 0117394
- Fatalities
- 0
- Total incidents
- 1
- Mines on record
- 1
- Years on record
- 2022
Compliance record
MSHA citations since 2015
19
citations
4
significant & substantial
$2,567
proposed penalties
$2,567
paid to date
100% of proposed penalties paid to date, a $0 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2012
34
inspections on record
324
inspection hours
n/a
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.Rate withheld: 324 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
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.$3K
proposed penalties
$3K
current assessed
$3K
paid to date
$0
outstanding
18 assessments are final orders; 1 contested dockets.
As of the most recent assessment on 2025-07-23.
Source: MSHA assessed-violations and conference/litigation data, updated weekly.
Top causes
- HANDLING OF MATERIALS 1 non-fatal
Incident timeline
2022
1
Mines on record
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The full compliance file on Diamond Materials, LLC
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.