Underground Coal Mine Violation Rates, 2009 A mine's violation rate is the citations written by federal inspectors per hour of time they spent inspecting that mine. Rates are displayed in red if they exceed last year's national rate of 0.18. The chart includes mines that produced at least 100,000 tons of coal in 2009. To sort the information, click on any of the chart's headers. Then use the arrow buttons on the bottom to scroll through the results.