2020-03-19_REPORT - C1981010 ‎(7)‎

• Permit No: C1981010
• IBM Index Class Name: Report
• Doc Date: 3/19/2020
• Doc Name Note: 2019 Annual Hydrology Report
• Doc Name: Annual Hydrology Report
• From: Trapper Mining, Inc.
• To: DRMS
• Annual Report Year: 2019
• Email Name: RAR
• Email Name: JLE
• Media Type: D
• Archive: No

(GP-7) is characterized by a very gradual decline the previous seven years with this well going dry
in mid-2018 and continuing through 2019. The KLM aquifer in well GP-8 showed a decline in 2001
through 2005 with a water level rise in 2006 and fairly steady levels in 2007 through 2014. A
gradual water level decline was observed in 2015 through 2019 in well GP-8. A significant amount
of well dewatering occurred from the G pit area in 2019.
Steady water levels had been observed the last eighteen years in well GMP-1 except for a
small increase during 2005 through 2011. The previous ten years show a water level rise due to the
movement of Pit A to the east of this area. The decrease in water levels in wells GD-2 and GD-3 in
2006 were caused by deep exploration drilling in this area. Water levels in these two wells gradually
rose in 2007 and overall increased a larger amount in 2008. Water levels continued to overall
gradually rise into 2011 and then became overall steady in well GD-2 but declined in well GD-3
until a rise was observed in 2016. The 2017 and 2019 water levels in these two wells were overall
steady. The water levels in KLM well GP-2 overall increased from 2008 through 2011 but steadily
declined in 2012 through 2019. The previous decline could have been caused by the decrease in
recharge and mining in this area but the present declines are likely due to less recharge. Water level
in well GP-5 is useful in defining natural variations in the QR aquifer for 2019. Water levels in well
GP-5 show a rising trend from 1993 through 1998 with a smaller rising trend from 1998 to 2002.
Water levels in this well then were fairly steady for five years with another overall rise from 2007
through 2011. Water levels in GP-5 were fairly steady in 2012 through 2014 and a small decline in
2015 and 2016 likely due to less recharge but fairly steady in 2017 through 2019. Water-level
changes are discussed in more detail in the following section.
2.1.2 WATER-LEVEL CHANGES
Water-level changes for 2019 are presented in Figures A-1 through A-11 in Appendix A.
The table in Appendix A lists data from 2010 through 2019 and the historical data for the Trapper
Trapper Mining Company 2-3
2019 Annual Report