MSHA record for Big Four Tunnel (mine ID 0504230). Fatalities, non-fatal incidents grouped by year, current operator and controller, and mine context.
Local economic context
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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.
Lake County, Colorado · Population 7,411
3.4%
Mining share of county employment
$93,655
Median household income
Source: US Census Bureau, American Community Survey 2023 5-year estimates.