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: 976 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
JAMACHA QUARRY has $46K in proposed MSHA penalties and $0 outstanding across 1 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.
$46K
proposed penalties
$30K
current assessed
$30K
paid to date
$0
outstanding
160 assessments are final orders; 1 contested dockets.
Of $19K in penalties contested before the Commission, $3K was upheld in final decisions.
As of the most recent assessment on 2025-04-01.
Source: MSHA assessed-violations and conference/litigation data, updated weekly.
Violation severity profile
ⓘShares are computed over citations that carry the MSHA gravity and negligence coding; a small share of records are uncoded.
Source: MSHA violations gravity and negligence coding, updated weekly.
When citations were contested
ⓘContesting a citation before the Federal Mine Safety and Health Review Commission is a lawful right. These figures state the public outcomes of that process, from MSHA's Contested Violations file.
4citations taken to the federal commission · 3% of citations on record
Settled
4 · 100%
100%
S&S designation survived the contest
ⓘCounts a Significant & Substantial citation as surviving when a settlement or judge's decision kept the designation, or the contest was dismissed or defaulted so the citation stands as issued. Vacated and withdrawn citations, and settlements that removed the designation, count against.
of 4 decided S&S contests · industry: 79%
86%
Penalty reduction in decided contests
$19K proposed, $3K after decisions · industry: 39%
Source: MSHA Contested Violations file (public record), updated weekly. A dismissed or defaulted contest leaves the citation standing as issued; a vacated or withdrawn citation is removed from the violation record. Latest contest filed 2010-07-14.
Contested penalties
ⓘA reduction or dismissal at the Commission is a lawful outcome of contesting a proposed penalty. Figures are the proposed amount and the amount upheld in the docket's decision.
Largest penalties this mine contested before the Federal Mine Safety and Health Review Commission, with the outcome on record.
Health sampling
ⓘA sample is a point in time compliance measurement, not an individual exposure history. These figures describe MSHA sampling records and do not establish causation or personal dose.
Metal and nonmetal contaminants (personal samples)
ⓘMany samples are screening measurements of substances with no applicable exposure limit; they are counted as samples but excluded from every over-limit figure. Over-limit shares use only limit-tested samples.
Last sampled: 2023-11-08
0%
of limit-tested samples over the exposure limit
15
samples
5
limit-tested
Most sampled contaminants
Respirable dust, <.1mg8
Quartz, respirable, >1% Qtz5
Unlisted Particulate, respirable, <1% Qtz2
Show the individual readings (15)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2023-11-08
Respirable dust, <.1mg
0
Front-end Loader Operator
2023-05-25
Respirable dust, <.1mg
0
Dry Screen Plant Operator
2023-05-25
Respirable dust, <.1mg
0
Cleanup Man
2019-04-09
Respirable dust, <.1mg
0
Crusher Oper/Worker
2019-04-09
Respirable dust, <.1mg
0
Laborer, Bullgang
2016-11-30
Unlisted Particulate, respirable, <1% Qtz
0.13
Laborer, Bullgang
2016-11-30
Respirable dust, <.1mg
0
Bulldozer Operator
2009-06-03
Quartz, respirable, >1% Qtz
0.23
0.6
0.38
Laborer, Bullgang
2009-06-03
Quartz, respirable, >1% Qtz
0.31
0.66
0.47
Crusher Oper/Worker
2005-11-08
Quartz, respirable, >1% Qtz
0.17
0.82
0.21
Crusher Oper/Worker
2005-11-08
Quartz, respirable, >1% Qtz
0.32
1.24
0.26
Laborer, Bullgang
2005-11-08
Respirable dust, <.1mg
0
Front-end Loader Operator
2004-11-30
Unlisted Particulate, respirable, <1% Qtz
0.29
Backhoe Operator
2004-11-30
Respirable dust, <.1mg
0
Laborer, Bullgang
2004-11-30
Quartz, respirable, >1% Qtz
0.48
0.51
0.94
Laborer, Bullgang
Source: MSHA respirable dust, quartz, and noise sampling records, updated weekly. Metal/nonmetal contaminant figures come from MSHA's Personal Health Samples and Area Samples files (public record), updated weekly.
JAMACHA QUARRY recorded 9.07 reportable injury cases per 100 full-time workers in 2024.
Injury rate, 2024
ⓘThis rate is reportable injury cases per 100 full-time-equivalent workers per year, computed as 200,000 times cases divided by MSHA operator-reported employee-hours. Cases are injuries MSHA graded degree 01 through 07; accident-only events that hurt no one are excluded, and so are contractor injuries, whose hours do not attach to a single mine. Rates begin in 2000, when quarterly employment reporting starts, and are withheld below 20,000 hours in a year.
9.07
total case rate
9.07
days-away rate
0.000
fatality rate
Above average. The US metal and nonmetal mining average was 1.77 and the all-US-mining average was 2.08 cases per 100 workers.
In California, metal and nonmetal mining averaged 1.48 cases per 100 workers that year.
Under 100,000 employee-hours were reported that year, so a single case moves the rate by two or more. Read the figure as approximate.
Year
total case rate
days-away
fatal
2024 *
9.07
9.07
0.000
2023 *
0.00
0.00
0.000
2022 *
0.00
0.00
0.000
2021 *
0.00
0.00
0.000
2020 *
0.00
0.00
0.000
2006 *
0.00
0.00
0.000
2005 *
0.00
0.00
0.000
* Fewer than 100,000 employee-hours that year; the rate is less stable.
Source: injury cases from MSHA accident and injury records; employee-hours from MSHA quarterly employment reports. Rate is cases per 100 full-time-equivalent workers, operator employees only.
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year
Employees
2025
8
2024
11
2023
13
2022
11
2021
10
2020
9
2019
8
2018
7
2017
6
2016
6
2015
6
2014
5
2013
6
2012
7
2011
5
2010
6
2009
6
2008
8
2007
11
2006
14
2005
13
2004
9
2003
9
2002
10
2001
10
2000
9
Source: MSHA quarterly employment and production, updated weekly.
JAMACHA QUARRY sits in San Diego County, California, where the Census mining category is 0.0% of county employment.
Local economic context
ⓘCounty figures come from the US Census Bureau's American Community Survey, 5-year pooled estimates, so the 2023 vintage covers 2019 through 2023. The Census category is 'mining, quarrying, and oil and gas extraction', which is broader than MSHA jurisdiction and includes oil and gas workers no mine employs. These figures describe the surrounding county, not this mine, and are not a factor in any specific incident.
San Diego County, California · Population 3,282,782
0.0%
Mining share of county employment
$102,285
Median household income
Source: US Census Bureau, American Community Survey 2023 5-year estimates.
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
Worker was cleaning plant when they pinched their right 4th and 5th fingers in between bobcat bucket and hydraulic ram causing laceration of the 4th finger and fracture of 5th finger.
2016 · 1 incident
November 8, 2016CA · Metal/Non-Metalbulldozer operator, universal operator, heavy equipment operator, operating engineerHANDLING OF MATERIALS
Employee was being trained on a Rock Drill when one of the steel drill rods on the rotating carousel became loose from the top part of the carousel star. While employee was applying pressure to the drill rod trying to push it back in place, EE smashed finger.
2014 · 1 incident
June 12, 2014CA · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanSTEPPING OR KNEELING ON OBJECT
While standing on a 4 x 12 board between two metal conveyor supports employee was guiding forklift operator to raise the gravity take-up on the belt to install a new belt. A fork got caught on a 3 piece of angle iron and the pressure on the fork became too great causing the angle iron to bend, and the fork to strike employee in the neck, face, and side of head.
2002 · 1 incident
June 19, 2002CA · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanSLIP OR FALL OF PERSON