Dunstone Rock Quarry Metal/Non-Metal
Dunstone Rock Quarry
· Surface
Controlled by
Robert J Hammett
Oroville, CA,
Butte County,
CA
·
Intermittent
MSHA Mine ID: 0405372
Dunstone Rock Quarry has $9K in proposed MSHA penalties and $4K outstanding across 0 contested dockets, plus health sampling and the full incident record.
Watch this mine
Email me when a new MSHA incident is filed at Dunstone Rock Quarry.
- Fatalities
- 0
- Total incidents
- 0
- Years on record
- —
- Latest incident
- —
Compliance record
MSHA citations since 2000
77
citations
9
significant & substantial
$8,794
proposed penalties
$4,948
paid to date
56% of proposed penalties paid to date, a $3,846 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2000
48
inspections on record
420
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: 420 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Dunstone Rock Quarry has $9K in proposed MSHA penalties and $4K outstanding across 0 contested dockets.
Penalty disposition
ⓘ
Differences between proposed and paid penalties reflect both settlements and conference reductions and amounts still owed. Outstanding is the balance currently owed.$9K
proposed penalties
$9K
current assessed
$5K
paid to date
$4K
outstanding
77 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2025-10-09.
Source: MSHA assessed-violations and conference/litigation data, updated weekly.
See also
the operator's enforcement record
Quarterly safety rates
ⓘ
Citations per million reported employee-hours. Rates begin in 2000, when MSHA's quarterly employment data starts; earlier incidents are counted but cannot be rate-adjusted. Quarters under 100,000 reported hours are greyed: too few hours for a stable rate.Citations per million employee-hours, as reported to MSHA
| Quarter | Hours worked | Citations | S&S | Per 1M hrs |
|---|---|---|---|---|
| 2025 Q3 | 390 | 0 | 0 | 0.0 |
| 2025 Q2 | 497 | 0 | 0 | 0.0 |
| 2025 Q1 | 315 | 0 | 0 | 0.0 |
| 2024 Q4 | 225 | 0 | 0 | 0.0 |
| 2024 Q3 | 236 | 0 | 0 | 0.0 |
| 2024 Q2 | 315 | 0 | 0 | 0.0 |
| 2024 Q1 | 236 | 0 | 0 | 0.0 |
| 2023 Q4 | 236 | 0 | 0 | 0.0 |
Show 73 earlier quarters Hide earlier quarters
| Quarter | Hours worked | Citations | S&S | Per 1M hrs |
|---|---|---|---|---|
| 2023 Q3 | 486 | 0 | 0 | 0.0 |
| 2023 Q2 | 486 | 0 | 0 | 0.0 |
| 2023 Q1 | 315 | 0 | 0 | 0.0 |
| 2022 Q4 | 315 | 9 | 4 | 28571.4 |
| 2022 Q3 | 634 | 0 | 0 | 0.0 |
| 2022 Q2 | 290 | 0 | 0 | 0.0 |
| 2022 Q1 | 308 | 0 | 0 | 0.0 |
| 2021 Q4 | 275 | 0 | 0 | 0.0 |
| 2021 Q3 | 299 | 5 | 0 | 16722.4 |
| 2021 Q2 | 308 | 0 | 0 | 0.0 |
| 2021 Q1 | 325 | 0 | 0 | 0.0 |
| 2020 Q4 | 343 | 0 | 0 | 0.0 |
| 2020 Q3 | 375 | 0 | 0 | 0.0 |
| 2020 Q2 | 287 | 0 | 0 | 0.0 |
| 2020 Q1 | 317 | 5 | 0 | 15772.9 |
| 2019 Q4 | 325 | 0 | 0 | 0.0 |
| 2019 Q3 | 355 | 0 | 0 | 0.0 |
| 2019 Q2 | 376 | 0 | 0 | 0.0 |
| 2019 Q1 | 327 | 0 | 0 | 0.0 |
| 2018 Q4 | 356 | 0 | 0 | 0.0 |
| 2018 Q3 | 299 | 0 | 0 | 0.0 |
| 2018 Q2 | 299 | 3 | 0 | 10033.4 |
| 2018 Q1 | 387 | 0 | 0 | 0.0 |
| 2017 Q4 | 220 | 0 | 0 | 0.0 |
| 2017 Q3 | 392 | 0 | 0 | 0.0 |
| 2017 Q2 | 221 | 0 | 0 | 0.0 |
| 2017 Q1 | 362 | 0 | 0 | 0.0 |
| 2016 Q4 | 251 | 0 | 0 | 0.0 |
| 2016 Q3 | 312 | 0 | 0 | 0.0 |
| 2016 Q2 | 288 | 0 | 0 | 0.0 |
| 2016 Q1 | 288 | 2 | 0 | 6944.4 |
| 2015 Q4 | 285 | 0 | 0 | 0.0 |
| 2015 Q3 | 385 | 0 | 0 | 0.0 |
| 2015 Q2 | 407 | 0 | 0 | 0.0 |
| 2015 Q1 | 415 | 3 | 0 | 7228.9 |
| 2014 Q4 | 420 | 0 | 0 | 0.0 |
| 2014 Q3 | 347 | 0 | 0 | 0.0 |
| 2014 Q2 | 325 | 0 | 0 | 0.0 |
| 2014 Q1 | 350 | 0 | 0 | 0.0 |
| 2013 Q4 | 312 | 1 | 0 | 3205.1 |
| 2013 Q3 | 252 | 0 | 0 | 0.0 |
| 2013 Q2 | 295 | 0 | 0 | 0.0 |
| 2013 Q1 | 275 | 0 | 0 | 0.0 |
| 2012 Q4 | 203 | 0 | 0 | 0.0 |
| 2012 Q3 | 275 | 0 | 0 | 0.0 |
| 2012 Q2 | 209 | 0 | 0 | 0.0 |
| 2012 Q1 | 250 | 0 | 0 | 0.0 |
| 2011 Q4 | 280 | 1 | 0 | 3571.4 |
| 2011 Q3 | 210 | 4 | 1 | 19047.6 |
| 2011 Q2 | 145 | 0 | 0 | 0.0 |
| 2011 Q1 | 0 | 0 | 0 | |
| 2010 Q4 | 0 | 1 | 0 | |
| 2010 Q3 | 15 | 8 | 0 | 533333.3 |
| 2009 Q2 | 0 | 0 | 0 | |
| 2009 Q1 | 0 | 0 | 0 | |
| 2008 Q4 | 0 | 0 | 0 | |
| 2008 Q3 | 146 | 0 | 0 | 0.0 |
| 2008 Q2 | 87 | 2 | 0 | 22988.5 |
| 2008 Q1 | 322 | 0 | 0 | 0.0 |
| 2007 Q4 | 1,274 | 0 | 0 | 0.0 |
| 2007 Q3 | 1,804 | 7 | 3 | 3880.3 |
| 2007 Q2 | 2,282 | 0 | 0 | 0.0 |
| 2007 Q1 | 1,555 | 5 | 0 | 3215.4 |
| 2006 Q4 | 1,808 | 1 | 0 | 553.1 |
| 2006 Q3 | 1,456 | 3 | 0 | 2060.4 |
| 2005 Q4 | 175 | 1 | 0 | 5714.3 |
| 2005 Q3 | 1,904 | 5 | 1 | 2626.1 |
| 2005 Q2 | 1,347 | 0 | 0 | 0.0 |
| 2005 Q1 | 1,082 | 0 | 0 | 0.0 |
| 2004 Q4 | 1,210 | 4 | 0 | 3305.8 |
| 2004 Q3 | 1,130 | 0 | 0 | 0.0 |
| 2004 Q2 | 1,222 | 0 | 0 | 0.0 |
| 2001 Q1 | 0 | 0 | 0 |
No reportable incidents on file.
MSHA has no recorded reportable accidents for this mine in the current dataset. New reports appear here within a week of being filed.
For insurers, brokers, and safety consultants
The full compliance file on Dunstone Rock Quarry
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.