NORTHBORO PLANT has $17K in proposed MSHA penalties and $207 outstanding across 1 contested dockets, plus health sampling and the full incident record.
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Fatalities
0
Total incidents
3
Years on record
1999–2022
Latest incident
Nov 2022
Compliance record
MSHA citations since 2000
104
citations
24
significant & substantial
$17,097
proposed penalties
$16,890
paid to date
99% of proposed penalties paid to date, a $207 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: 771 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
NORTHBORO PLANT has $17K in proposed MSHA penalties and $207 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.
$17K
proposed penalties
$17K
current assessed
$17K
paid to date
$207
outstanding
100 assessments are final orders; 1 contested dockets.
Of $2K in penalties contested before the Commission, $2K was upheld in final decisions.
As of the most recent assessment on 2026-01-14.
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.
1citations taken to the federal commission · 1% of citations on record
Settled
1 · 100%
0%
Penalty reduction in decided contests
$2K proposed, $2K 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 A dismissed or defaulted contest leaves the citation standing as issued; a vacated or withdrawn citation is removed from the violation record.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 2013-05-14.
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: 2026-01-14
0%
of limit-tested samples over the exposure limit
20
samples
5
limit-tested
Most sampled contaminants
Respirable dust, <.1mg13
Quartz, respirable, >1% Qtz6
Unlisted Particulate, respirable, <1% Qtz1
Show the individual readings (20)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2026-01-14
Quartz, respirable, >1% Qtz
0.19
Truck Driver
2026-01-14
Respirable dust, <.1mg
0
Crusher Oper/Worker
2026-01-14
Respirable dust, <.1mg
0
Rotary Bucket Ex. Operator
2024-05-23
Respirable dust, <.1mg
0
Front-end Loader Operator
2024-05-23
Quartz, respirable, >1% Qtz
0.19
0.69
0.28
Crusher Oper/Worker
2022-01-12
Respirable dust, <.1mg
0
Front-end Loader Operator
2016-04-26
Respirable dust, <.1mg
0
Front-end Loader Operator
2016-04-26
Respirable dust, <.1mg
0
Backhoe Operator
2016-04-26
Unlisted Particulate, respirable, <1% Qtz
0.2
Drill Operator, Rotary Air
2009-04-23
Respirable dust, <.1mg
0
Truck Driver
2009-04-23
Respirable dust, <.1mg
0
Crusher Oper/Worker
2005-04-20
Respirable dust, <.1mg
0
Backhoe Operator
2005-04-20
Respirable dust, <.1mg
0
Front-end Loader Operator
2005-04-20
Respirable dust, <.1mg
0
Front-end Loader Operator
2005-04-20
Quartz, respirable, >1% Qtz
0.33
1.65
0.20
Crusher Oper/Worker
2000-10-12
Quartz, respirable, >1% Qtz
0.27
0.82
0.33
Truck Driver
2000-10-12
Respirable dust, <.1mg
0
Front-end Loader Operator
2000-10-12
Quartz, respirable, >1% Qtz
0.37
0.49
0.76
Crusher Oper/Worker
2000-10-12
Respirable dust, <.1mg
0
Backhoe Operator
2000-10-12
Quartz, respirable, >1% Qtz
0.3
1.23
0.24
Drill Operator, Rotary
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.
NORTHBORO PLANT recorded 0.00 reportable injury cases per 100 full-time workers in 2025.
Injury rate, 2025
ⓘ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
No reportable injury cases in any year shown. Employee-hours were reported in each of those years, so these are true zeros rather than missing data. Citations, listed in the compliance record above, are inspector-found violations and are counted separately from worker injuries.
Below average. The US metal and nonmetal mining average was 1.65 and the all-US-mining average was 1.97 cases per 100 workers.
In Massachusetts, metal and nonmetal mining averaged 2.41 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
2025 *
0.00
0.00
0.000
2020 *
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
2026
9
2025
10
2024
8
2023
8
2022
9
2021
8
2020
10
2019
8
2018
7
2017
7
2016
7
2015
8
2014
8
2013
7
2012
7
2011
7
2010
7
2009
4
2008
6
2007
6
2006
6
2005
6
2004
6
2003
7
2002
9
2001
9
2000
9
Source: MSHA quarterly employment and production, updated weekly.
NORTHBORO PLANT sits in Worcester County, Massachusetts, 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.
Worcester County, Massachusetts · Population 861,664
0.0%
Mining share of county employment
$93,561
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
Drill steel dropped down from grippers on to drill deck; employee lifted drill steel from deck and felt pain in right bicep. The right bicep bruised and swelled, felt weak after incident.
(Injured) operating a Cat 769C. while being loaded in quarry, a Cat 345B with a NPK GH-18 hammer approximately 60 feet away was breaking oversize rock. a piece of fly rock from the GH-18 broke the drivers side glass on the 769C. (operator of 769C) got a piece of glass in left eye.
1999 · 1 incident
November 9, 1999MA · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorHANDLING OF MATERIALS
WHILE UNLOADING INDUSTRIAL SCREEN, SCREEN SLIPPED. EE JUMPED BACK TO AVOID SCREEN FALLING ON HIS FEET. HE TRIED TO CATCH SCREEN WITH HIS HAND AND HE CAUGHT HIS FINGER AND TORE IT. HE WAS WEARI NG GLOVES.