Original EA Amendment

Heritage Minerals MMM EA Compliance Review

Appendix C - Exceedance Graphs

MB05-S (Zinc)

MB07-D (Zinc)

10 15 20 25 30 35 40

10 15 20 25 30

0 5

Jul-22 Oct-22 Jan-23 Apr-23 Jul-23 Oct-23 Jan-24 Apr-24 Jul-24 Oct-24

MB05-S

WQO

MB07-D WQO

MB08-D (Zinc)

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Jul-22 Oct-22 Jan-23 Apr-23 Jul-23 Oct-23 Jan-24 Apr-24 Jul-24 Oct-24 MB09 (Zinc) MB09 WQO

10 12 14 16 18 20

0 2 4 6 8

Jul-22 Oct-22 Jan-23 Apr-23 Jul-23 Oct-23 Jan-24 Apr-24 Jul-24 Oct-24

MB08-D WQO

MB11 (Zinc)

MB14 (Zinc)

10 15 20 25 30

0 5

Jul-22 Oct-22 Jan-23 Apr-23 Jul-23 Oct-23 Jan-24 Apr-24 Jul-24 Oct-24

MB11

WQO

MB14

WQO

0 0.001 0.002 0.003 0.004 0.005 0.006 0.007 0.008 0.009 0.01 Jul-22 Oct-22 Jan-23 Apr-23 Jul-23 Oct-23 Jan-24 Apr-24 Jul-24 Oct-24 MB02 (Total Cyanide) MB02 WQO 0 0.001 0.002 0.003 0.004 0.005 0.006 0.007 0.008 0.009 0.01 Jul-22 Oct-22 Jan-23 Apr-23 Jul-23 Oct-23 Jan-24 Apr-24 Jul-24 Oct-24 MB05-D (Total Cyanide) MB05-D WQO

0 0.001 0.002 0.003 0.004 0.005 0.006 0.007 0.008 0.009 0.01 Jul-22 Oct-22 Jan-23 Apr-23 Jul-23 Oct-23 Jan-24 Apr-24 Jul-24 Oct-24 MB04-D (Total Cyanide) MB04-D WQO 0 0.001 0.002 0.003 0.004 0.005 0.006 0.007 0.008 0.009 0.01 Jul-22 Oct-22 Jan-23 Apr-23 Jul-23 Oct-23 Jan-24 Apr-24 Jul-24 Oct-24 MB05-S (Total Cyanide) MB05-S WQO