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Yosemite Slate Quarry Metal/Non-Metal

Controlled by David R Butler
mariposa, Mariposa County, CA  ·  Intermittent
MSHA Mine ID: 0400357

Yosemite Slate Quarry has $3K in proposed MSHA penalties and $187 outstanding across 3 contested dockets, plus health sampling and the full incident record.

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Fatalities
0
Total incidents
1
Years on record
2006
Latest incident
Jan 2006
Compliance record
MSHA citations since 2001
19
citations
6
significant & substantial
$2,552
proposed penalties
$2,199
paid to date
86% of proposed penalties paid to date, a $353 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2000
52
inspections on record
516
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: 516 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.

Yosemite Slate Quarry has $3K in proposed MSHA penalties and $187 outstanding across 3 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.
$3K
proposed penalties
$2K
current assessed
$2K
paid to date
$187
outstanding
19 assessments are final orders; 3 contested dockets.
As of the most recent assessment on 2024-06-25.
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 Q4 4 0 0 0.0
2025 Q3 12 0 0 0.0
2025 Q2 16 0 0 0.0
2025 Q1 16 0 0 0.0
2024 Q4 11 0 0 0.0
2024 Q3 13 0 0 0.0
2024 Q2 26 4 0 153846.2
2024 Q1 0 0 0
Show 91 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2023 Q4 0 0 0
2023 Q3 43 0 0 0.0
2023 Q2 36 0 0 0.0
2023 Q1 27 0 0 0.0
2022 Q4 1,399 0 0 0.0
2022 Q3 1,648 0 0 0.0
2022 Q2 1,419 0 0 0.0
2022 Q1 977 0 0 0.0
2021 Q4 203 0 0 0.0
2021 Q3 280 0 0 0.0
2021 Q2 290 0 0 0.0
2021 Q1 142 0 0 0.0
2020 Q4 191 0 0 0.0
2020 Q3 238 0 0 0.0
2020 Q2 103 0 0 0.0
2020 Q1 622 0 0 0.0
2019 Q4 1,292 0 0 0.0
2019 Q3 1,780 0 0 0.0
2019 Q2 685 0 0 0.0
2019 Q1 327 0 0 0.0
2018 Q4 438 0 0 0.0
2018 Q3 972 0 0 0.0
2018 Q2 1,512 0 0 0.0
2018 Q1 891 0 0 0.0
2017 Q4 1,297 1 0 771.0
2017 Q3 1,465 0 0 0.0
2017 Q2 1,464 0 0 0.0
2017 Q1 0 0 0
2016 Q4 253 1 1 3952.6
2016 Q3 1,549 0 0 0.0
2016 Q2 1,551 1 0 644.7
2016 Q1 1,251 0 0 0.0
2015 Q4 1,161 1 0 861.3
2015 Q3 1,594 0 0 0.0
2015 Q2 1,530 0 0 0.0
2015 Q1 1,500 0 0 0.0
2014 Q4 1,380 0 0 0.0
2014 Q3 1,296 0 0 0.0
2014 Q2 1,390 1 1 719.4
2014 Q1 1,248 0 0 0.0
2013 Q4 1,152 0 0 0.0
2013 Q3 1,620 0 0 0.0
2013 Q2 1,785 0 0 0.0
2013 Q1 1,380 1 1 724.6
2012 Q4 984 0 0 0.0
2011 Q2 1,035 0 0 0.0
2011 Q1 288 0 0 0.0
2010 Q4 691 0 0 0.0
2010 Q3 1,095 0 0 0.0
2010 Q2 1,614 0 0 0.0
2010 Q1 732 0 0 0.0
2009 Q4 821 0 0 0.0
2009 Q3 1,139 0 0 0.0
2009 Q2 1,244 0 0 0.0
2009 Q1 664 1 0 1506.0
2008 Q4 1,171 0 0 0.0
2008 Q3 1,473 0 0 0.0
2008 Q2 2,020 0 0 0.0
2008 Q1 1,564 0 0 0.0
2007 Q4 1,390 0 0 0.0
2007 Q3 2,003 3 0 1497.8
2007 Q2 1,805 0 0 0.0
2007 Q1 1,353 1 0 739.1
2006 Q4 1,077 0 0 0.0
2006 Q3 1,512 0 0 0.0
2006 Q2 1,498 0 0 0.0
2006 Q1 1,134 0 0 0.0
2005 Q4 1,112 0 0 0.0
2005 Q3 1,300 0 0 0.0
2005 Q2 1,338 2 2 1494.8
2005 Q1 1,223 0 0 0.0
2004 Q4 1,123 0 0 0.0
2004 Q3 1,169 0 0 0.0
2004 Q2 1,940 0 0 0.0
2004 Q1 1,552 0 0 0.0
2003 Q4 1,425 0 0 0.0
2003 Q3 1,930 0 0 0.0
2003 Q2 1,383 0 0 0.0
2003 Q1 2,178 0 0 0.0
2002 Q4 1,613 0 0 0.0
2002 Q3 2,448 0 0 0.0
2002 Q2 2,479 0 0 0.0
2002 Q1 2,068 0 0 0.0
2001 Q4 2,016 0 0 0.0
2001 Q3 2,285 0 0 0.0
2001 Q2 2,271 0 0 0.0
2001 Q1 1,854 2 1 1078.7
2000 Q4 1,677 0 0 0.0
2000 Q3 2,150 0 0 0.0
2000 Q2 1,952 0 0 0.0
2000 Q1 1,675 0 0 0.0
No fatalities recorded at this mine.

Reportable incidents

1 on file

2006 · 1 incident

January 20, 2006 CA · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
Mariposa Flagstone Company · Caught in, under or between (Not Elsewhere Classified)

At 11 am EE rolled a rock on his right finger rt smashed the tip. Did not lose nail went to dr. and put in finger split.

For insurers, brokers, and safety consultants

The full compliance file on Yosemite Slate 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.

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