7
Figure 11. Changes over time in N3N7 from July 2022 to October 2022 (Red represents material removed and blue represents
material added) A) In mine view B) Ariel view
Figure 12. Ariel view of N3N2 changes over time from June 2019 to July 2022 (Red represents
material removed and blue represents material added)
Table 1. Indicators of Potential Ground Failure
Indicators Good Bad
Heading Orientation N35W N-S
Overburden Less than 140 ft Greater than 140 ft
Distance to Stream Bed Greater than 200 ft Less than 200 ft
Distance to Joint and Clay Vein Greater than 100 ft Less than 100 ft
Caprock Thickness Greater than 36 in Less than 36 in
Figure 11. Changes over time in N3N7 from July 2022 to October 2022 (Red represents material removed and blue represents
material added) A) In mine view B) Ariel view
Figure 12. Ariel view of N3N2 changes over time from June 2019 to July 2022 (Red represents
material removed and blue represents material added)
Table 1. Indicators of Potential Ground Failure
Indicators Good Bad
Heading Orientation N35W N-S
Overburden Less than 140 ft Greater than 140 ft
Distance to Stream Bed Greater than 200 ft Less than 200 ft
Distance to Joint and Clay Vein Greater than 100 ft Less than 100 ft
Caprock Thickness Greater than 36 in Less than 36 in