DQA Dumbarton Quarry has $2K in proposed MSHA penalties and $0 outstanding across 1 contested dockets, plus health sampling and the full incident record.
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Fatalities
0
Total incidents
38
Years on record
1983–2005
Latest incident
Oct 2005
Compliance record
MSHA citations since 2000
30
citations
7
significant & substantial
$2,314
proposed penalties
$2,174
paid to date
94% of proposed penalties paid to date, a $140 gap.
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: 262 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
DQA Dumbarton Quarry has $2K 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.
$2K
proposed penalties
$2K
current assessed
$2K
paid to date
$0
outstanding
30 assessments are final orders; 1 contested dockets.
Of $140 in penalties contested before the Commission, $0 was upheld in final decisions.
As of the most recent assessment on 2007-03-20.
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.
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: 2007-03-20, 19 years ago
14%
of limit-tested samples over the exposure limit
10
samples
7
limit-tested
Most sampled contaminants
Quartz, respirable, >1% Qtz71 over
Respirable dust, <.1mg2
Unlisted Particulate, respirable, <1% Qtz1
Show the individual readings (10)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2007-03-20
Quartz, respirable, >1% Qtz
0.75
0.67
1.12
Crusher Oper/Worker
2007-03-20
Quartz, respirable, >1% Qtz
0.45
2.57
0.18
Front-end Loader Operator
2007-03-20
Quartz, respirable, >1% Qtz
0.27
0.81
0.33
Laborer, Bullgang
2004-05-26
Quartz, respirable, >1% Qtz
0.42
1.08
0.39
Crusher Oper/Worker
2004-05-26
Quartz, respirable, >1% Qtz
0.36
0.73
0.49
Laborer, Bullgang
2004-05-26
Respirable dust, <.1mg
0
Front-end Loader Operator
2000-11-02
Respirable dust, <.1mg
0
Bulldozer Operator
2000-11-02
Quartz, respirable, >1% Qtz
0.3
1.91
0.16
Laborer, Bullgang
2000-11-02
Quartz, respirable, >1% Qtz
0.44
1.78
0.25
Crusher Oper/Worker
2000-11-02
Unlisted Particulate, respirable, <1% Qtz
14.9
Crusher Oper/Worker
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.
DQA Dumbarton Quarry recorded 0.00 reportable injury cases per 100 full-time workers in 2006.
Injury rate, 2006
ⓘ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.
0.00
total case rate
0.00
days-away rate
0.000
fatality rate
Below average. The US metal and nonmetal mining average was 3.41 and the all-US-mining average was 3.91 cases per 100 workers.
In California, metal and nonmetal mining averaged 4.49 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
2006 *
0.00
0.00
0.000
2005 *
6.86
0.00
0.000
2004 *
0.00
0.00
0.000
2003 *
0.00
0.00
0.000
2002 *
0.00
0.00
0.000
2001 *
0.00
0.00
0.000
2000 *
10.07
3.36
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
2007
18
2006
29
2005
23
2004
24
2003
22
2002
21
2001
22
2000
21
Source: MSHA quarterly employment and production, updated weekly.
DQA Dumbarton Quarry sits in Alameda 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.
Alameda County, California · Population 1,651,949
0.0%
Mining share of county employment
$126,240
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
Miner was cutting a belt using a hand-operated belt cutter. Miner applied force to the cutter which moved forward suddenly. Forearm was lacerated by cutter guide fence and/or securement device. Laceration closed by 12 stitches.
DQA · Caught in, under or between a moving and a stationary object
THE EE ATTEMPTED TO FREE UP A TROUGHING ROLLER WHILE THE PLANT WAS RUNNING. NO LOCK OUT TAG A WAS DONE. THE EE STRUCK THE ROLLER WITH A HAMMER AND WAS DROWN INTO THE ROLLER. A PUNCTURE WOUND WAS RECEIVED TO HIS LEFT FOREARM.
WHILE STRIKING A PUNCH OR CHISEL WITH A HAMMER A PIECE OF METAL BROKE OFF OF THE CHISEL AND PUNCTURED THE FOREARM IMBEDDING A SMALL PIECE OF METAL IN THE ARM.
January 24, 2000CA · Metal/Non-Metalbulldozer operator, universal operator, heavy equipment operator, operating engineerHANDLING OF MATERIALS
DQA · Caught in, under or between (Not Elsewhere Classified)
AN EE SMASHED HIS FINGER WHILE REMOVING A GUARD FROM A TAIL PULLEY ON A BELT STACKER.
ELECTRICAL MALFUNCTION AT THE MAIN PANEL LOCATEDINSIDE A STATIONARY TRAILER CAUSED A FIRE TRANSFORMERS SUPPLED BY PG&E DID NOT TRIP CAUSING THEFIRE TO CONTINUE TOTAL LOSS TO THE TRAILER CONTAI NING ELECTRICAL SUBPANELS CONTROLLING THE ROCK PUMP
1996 · 1 incident
April 23, 1996CA · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorHANDLING OF MATERIALS
EMPLOYEE WAS REMOVING BARREL OF OIL FROM STORAGE SHED. BARREL SLIPPED AND STRUCK GARDENING HOE USED TO SCRAPE FLOOR. HOE FLIPPED UP AND WOOD HANDLE STRUCK EMPLOYEE IN FOREHEAD.
1994 · 3 incidents
March 7, 1994CA · Metal/Non-Metalgreaser, grease man, oiler, lube man, dragline oilerHANDLING OF MATERIALS
EMPLOYEE, WHO HAD A PRE-EXISTING UMBICAL HERNIA, WAS REMOVING A FILE BOX FROM A STORAGE CLOSET AND MOVED IN SUCH A WAY THAT THE BOWEL BECAME INCARCERATED IN THE HERNIA REQUIRING THAT EMPLOYEE UNDERGO A HERNIORRHAPHY SIX DAYS LATER
August 13, 1991CA · Metal/Non-Metalfront-end loader, scraper-loader operator, pan operator, payloader, scraper rig operatorMACHINERY
WALKING BACKWARDS WHILE DIRECTING A TRUCK EMPLOYEE TRIPPED AND FELL.
1988 · 2 incidents
December 3, 1988CA · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorMACHINERY
DQA · Caught in, under or between a moving and a stationary object
EMPLOYEE WAS GUIDING ONE SIDE OF CRUSHER LINES OUT OF CRUSHER(LINER WAS BEING LIFTIED WITH RTC)AFTER REMOVING THE LAST BOLT,WHICH WAS BOUND UP,HE SIGNALED THE CRANE OPERATOR TO PICK UP THE PIE SLIGHTLY.THE PIECE SHIFTED AND CAUGHT HIS FINGER BETWEEN THE BOLT HEAD AND BOLT POCKET.EMPLOYEE WAS WEARING WELDERS PROTECTIVE GLOVES AS SUPPLIED BY HOPPER.LEFT INDEX FINGER REQUIRED 5 STITCH
EMPLOYEE WAS AS8ISTING ON A MAINTGENANCE PROJECT WHEN A 1IN DRIVE SOCKET FELL FROM A H EIGHT OF 4FT LANDING ON EMPOYEES FINGER
August 21, 1987CA · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanHANDLING OF MATERIALS
DQA · Caught in, under or between a moving and a stationary object
EMPLOYEE WAS HE5PING WASH DOWN ROCK PLANT AFTER A PRODUCTION SHIFT AND CAUGHT HIS THUMB BETWEEN THE HOSE NOZZLE AND A METAL BEAM. LACERATED LEFT THUMB.
OPERATOR WAS HA6LING CRUSHED ROCK TO FEED STOCKPILE AND BACKED TOO CLOSE TO EDGE OF PILE CAUSING TRUCK TO SLIDE BACKWARDS AT WHICH TIME THE OPERATOR JUMPED FROM THE CAM TO THE GROUND.NO DAMAGE TO TRUCK. 3
July 10, 1987CA · Metal/Non-Metalfront-end loader, scraper-loader operator, pan operator, payloader, scraper rig operatorPOWERED HAULAGE
EMP WAS WORKING UNDER SCREEN DECK, CLEANING UP. HE GRABBED FRAMEWORK TO REPOSITION HIMSELF. THE FRAMEWORK WAS COVERED WITH DUSTY MATERIAL. HE LOST HIS GRIP AND FELL BACKWARD, BUMPING HIS HEAD ON STEEL HOPPER
1983 · 3 incidents
September 22, 1983CA · Metal/Non-Metalbulldozer operator, universal operator, heavy equipment operator, operating engineerMACHINERY