Robertson's operator
Controlled by
RRM Development Corporation; Mitsubishi Corp
MSHA operator ID: L14361
- Fatalities
- 0
- Total incidents
- 133
- Mines on record
- 10
- Years on record
- 1997–2026
Compliance record
MSHA citations since 2000
1,203
citations
314
significant & substantial
$503,240
proposed penalties
$451,347
paid to date
90% of proposed penalties paid to date, a $51,893 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2000
551
inspections on record
9,624
inspection hours
12.5
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.1,203 citations across 9,624 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.$503K
proposed penalties
$451K
current assessed
$451K
paid to date
$0
outstanding
1,181 assessments are final orders; 17 contested dockets.
As of the most recent assessment on 2026-03-04.
Source: MSHA assessed-violations and conference/litigation data, updated weekly.
Top causes
- SLIP OR FALL OF PERSON 33 non-fatal
- HANDLING OF MATERIALS 31 non-fatal
- HANDTOOLS (NONPOWERED) 21 non-fatal
- POWERED HAULAGE 18 non-fatal
- MACHINERY 9 non-fatal
- OTHER 9 non-fatal
Incident timeline
2026
3
2025
4
2024
7
2023
10
2022
8
2021
13
2020
10
2019
6
2018
8
2017
6
2016
4
2015
8
2014
1
2013
2
2012
1
2011
1
2010
1
2009
2
2007
1
2006
7
2005
1
2004
1
2003
3
2002
3
2001
5
2000
3
1999
4
1998
5
1997
5
Mines on record
- Palmdale CA
- Cabazon CA
- Corona CA
- Rialto CA
- Jean Plant NV
- El Cajon Quarry CA
- Banning CA
- Redlands CA
- Lucerne Valley CA
- Star CA
Watch this operator
Email me when a new MSHA incident is filed at any Robertson's mine.
For insurers, brokers, and safety consultants
The full compliance file on Robertson's
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.