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: 151 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Ottertail Aggregate #1 has $1K in proposed MSHA penalties and $0 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.
$1K
proposed penalties
$1K
current assessed
$1K
paid to date
$0
outstanding
13 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2014-07-09.
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.
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: 2024-05-15
0%
of limit-tested samples over the exposure limit
2
samples
1
limit-tested
Most sampled contaminants
Quartz, respirable, >1% Qtz1
Respirable dust, <.1mg1
Show the individual readings (2)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2024-05-15
Respirable dust, <.1mg
0
Front-end Loader Operator
2009-07-28
Quartz, respirable, >1% Qtz
0.75
2.43
0.31
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.
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year
Employees
2026
2
2025
1
2024
2
2023
3
2015
0
2014
3
2013
0
2012
1
2011
2
2010
2
2009
2
2008
2
2007
2
2006
2
2005
2
2004
1
2003
3
2002
2
2001
3
2000
2
1999
2
1998
2
1997
3
Source: MSHA quarterly employment and production, updated weekly; years before 2000 come from MSHA's archived Part 50 employment files.
Ottertail Aggregate #1 sits in Otter Tail County, Minnesota, where the Census mining category is 0.1% 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.
Otter Tail County, Minnesota · Population 60,281
0.1%
Mining share of county employment
$70,912
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; earlier incidents are counted but not rate-adjusted, though reported hours reach back to 1983. 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
2026 Q2
86
0
0
0.0
2026 Q1
2
0
0
0.0
2025 Q4
68
0
0
0.0
2025 Q3
2
0
0
0.0
2025 Q2
2
0
0
0.0
2024 Q4
126
0
0
0.0
2024 Q2
122
0
0
0.0
2024 Q1
2
0
0
0.0
Show 60 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2023 Q4
34
0
0
0.0
2023 Q3
31
0
0
0.0
2015 Q1
0
0
0
2014 Q4
62
0
0
0.0
2014 Q3
217
1
0
4608.3
2014 Q2
104
0
0
0.0
2013 Q2
0
0
0
2013 Q1
0
0
0
2012 Q4
0
0
0
2012 Q3
209
0
0
0.0
2012 Q2
1
0
0
0.0
2012 Q1
0
0
0
2011 Q4
164
1
0
6097.6
2011 Q3
15
1
0
66666.7
2011 Q2
0
0
0
2011 Q1
0
0
0
2010 Q4
282
0
0
0.0
2010 Q3
45
3
1
66666.7
2010 Q2
121
0
0
0.0
2010 Q1
0
0
0
2009 Q4
41
0
0
0.0
2009 Q3
225
2
0
8888.9
2009 Q2
241
0
0
0.0
2009 Q1
0
0
0
2008 Q4
110
0
0
0.0
2008 Q3
386
0
0
0.0
2008 Q2
42
1
0
23809.5
2008 Q1
0
0
0
2007 Q4
362
0
0
0.0
2007 Q3
452
0
0
0.0
2007 Q2
222
1
0
4504.5
2007 Q1
0
0
0
2006 Q4
0
0
0
2006 Q3
1,050
0
0
0.0
2006 Q2
600
1
0
1666.7
2006 Q1
0
0
0
2005 Q4
375
0
0
0.0
2005 Q3
895
0
0
0.0
2005 Q2
260
0
0
0.0
2005 Q1
50
0
0
0.0
2004 Q4
89
1
0
11236.0
2004 Q3
261
0
0
0.0
2004 Q2
0
0
0
2004 Q1
0
0
0
2003 Q4
205
0
0
0.0
2003 Q3
590
0
0
0.0
2003 Q2
186
0
0
0.0
2003 Q1
1
0
0
0.0
2002 Q4
498
0
0
0.0
2002 Q3
336
0
0
0.0
2002 Q2
207
0
0
0.0
2002 Q1
0
0
0
2001 Q4
360
1
0
2777.8
2001 Q3
702
0
0
0.0
2001 Q2
348
0
0
0.0
2001 Q1
0
0
0
2000 Q4
246
0
0
0.0
2000 Q3
880
0
0
0.0
2000 Q2
261
0
0
0.0
2000 Q1
0
0
0
No fatalities recorded at this mine.
Reportable incidents
4 on file
2006 · 1 incident
September 27, 2006MN · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorOTHER
EE WAS SHOVELING ROCKS OFF OF THE CRUSHER AND APPEARS TO HAVE SPRAINED OR STRAINED HIS BACK.
1999 · 1 incident
November 18, 1999MN · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorPOWERED HAULAGE
James E Ahlfs Const · Caught in, under or between running or meshing objects
EE WAS HAMMERING LOOSE A BUILD UP OF TAR MILLING FROM A ROLLER. EITHER THE HAMMER GOT CAUGHT BY PULLEY PULLING HIS ARM OR THE BELT CAUGHT THE SLEEVE OF HIS COVERALL AND PULLED HIS HAND AND BRO KE HIS ARM. THE EE IS NOT SURE BUT HE THINKS PROBABLY THE LATER.
1997 · 1 incident
July 28, 1997MN · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorPOWERED HAULAGE