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: 94 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Demarco has $790 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.
$790
proposed penalties
$790
current assessed
$790
paid to date
$0
outstanding
9 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2021-06-02.
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: 2021-06-03, 5 years ago
3
samples
0
limit-tested
Most sampled contaminants
Respirable dust, <.1mg3
Show the individual readings (3)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2021-06-03
Respirable dust, <.1mg
0
Front-end Loader Operator
2021-06-03
Respirable dust, <.1mg
0
Crusher Oper/Worker
2021-06-03
Respirable dust, <.1mg
0
Front-end Loader Operator
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
2025
0
2024
0
2023
0
2022
1
2021
2
2020
3
2010
0
2009
0
2008
1
2007
0
2006
0
2005
3
2003
0
2002
1
2001
0
2000
1
Source: MSHA quarterly employment and production, updated weekly.
Demarco sits in Lyon County, Iowa, 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.
Lyon County, Iowa · Population 12,087
0.0%
Mining share of county employment
$72,881
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
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2025 Q2
0
0
0
2025 Q1
0
0
0
2024 Q4
0
0
0
2024 Q3
0
0
0
2024 Q2
0
0
0
2024 Q1
0
0
0
2023 Q4
0
0
0
2023 Q3
0
0
0
Show 48 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2023 Q2
563
0
0
0.0
2023 Q1
0
0
0
2022 Q4
0
0
0
2022 Q3
265
0
0
0.0
2022 Q2
453
0
0
0.0
2022 Q1
0
0
0
2021 Q4
0
0
0
2021 Q3
2,621
0
0
0.0
2021 Q2
1,808
1
0
553.1
2021 Q1
0
0
0
2020 Q4
883
0
0
0.0
2020 Q3
1,198
1
0
834.7
2020 Q2
1,702
0
0
0.0
2010 Q2
0
0
0
2010 Q1
0
0
0
2009 Q4
0
0
0
2009 Q3
0
0
0
2009 Q2
0
0
0
2009 Q1
0
0
0
2008 Q4
2,116
3
0
1417.8
2008 Q2
0
0
0
2008 Q1
0
0
0
2007 Q4
0
0
0
2007 Q3
0
0
0
2007 Q2
0
0
0
2007 Q1
0
0
0
2006 Q4
0
0
0
2006 Q3
0
0
0
2006 Q2
0
0
0
2006 Q1
0
0
0
2005 Q4
1,242
0
0
0.0
2005 Q3
1,874
0
0
0.0
2005 Q2
1,671
0
0
0.0
2003 Q3
0
0
0
2003 Q2
0
0
0
2003 Q1
0
0
0
2002 Q4
165
0
0
0.0
2002 Q3
369
0
0
0.0
2002 Q2
0
0
0
2002 Q1
0
0
0
2001 Q4
0
0
0
2001 Q3
0
0
0
2001 Q2
0
0
0
2001 Q1
0
0
0
2000 Q4
0
0
0
2000 Q3
158
4
2
25316.5
2000 Q2
164
0
0
0.0
2000 Q1
0
0
0
No fatalities recorded at this mine.
Reportable incidents
2 on file
2005 · 2 incidents
July 15, 2005IA · Metal/Non-Metalbulldozer operator, universal operator, heavy equipment operator, operating engineerHANDLING OF MATERIALS