2022-02-09_PERMIT FILE - M2021046 ‎(5)‎

• Permit No: M2021046
• IBM Index Class Name: Permit File
• Doc Date: 2/9/2022
• Doc Name Note: Appendix B Gem Services Report
• Doc Name: Adequacy Review Response
• From: Zephyr Gold USA Ltd
• To: DRMS
• Email Name: TC1
• Email Name: MAC
• Media Type: D
• Archive: No

GEM SERVICES
Dawson Project-Tailings Characterization Page 16
Table 9: Water Quality of Tailings Filtrate Samples
Tailings Filtrate EPA 5 CCR 1002-32 Background Reg.41
Parameter Method Unit ROL BL737-04 BL737-05 40 CFR Part 440 WO Standard' Groundwater Groundwater
(altered) (unaltered) Subpart J Grape Creek Quality Standard
On filtered samples(using 0.45 pm filter paper):
pH Meter pH units 0.01 7.4 7.4 6-9
EC Meter mV 1.0 260 178
Acidity(to pH 8.3) Titration mg CaCOa/L 0.5 7.5 9.0
Total Alkalinity(to pH 4.5) Titration mg CaCO3/L 0.5 69.0 56.5
Dissolved Sulphate(SO4) Colourimetry mg/L 0.5 52.1 23.2 250
Chloride IC mg/L 0.05 8.77 8.3
Fluoride IC mg/L 0.02 0.63 0.8 2.6
Dissolved Metals Analysis It e ICP-MS:
Hardness,Total(as CaCO3) Calc. mg CaCO3/L 0.5 82.7 43.7
Aluminum Dissolved ICP-MS mg/L 0.001 0.006 0.015 0.157 0.459 5
Antimony Dissolved ICP-MS mg/L 0,0001 0.0003 0.0004
Arsenic Dissolved ICP-MS mg/L 0.0002 0.0002 0.0003 0.34 <0.01 0.01
Barium Dissolved ICP-MS moll- 0.0002 0.0235 0.0123
Beryllium Dissolved ICP-MS mg/L 0.0001 <0.0001 <0.0001 <0.005 0.004
Bismuth Dissolved ICP-MS mg/L 0,0001 <0.0001 <0.0001
Boron Dissolved ICP-MS mg/L 0.01 <0.01 <0,01 0.00075 0.23 0.75
Cadmium Dissolved ICP-MS mg/L 0.00001 0.00005 0.00007 0.05 0.00039 <0.005 0.005
Calcium Dissolved ICP-MS mg/L 0.05 26.4 13.5 73.8
Chromium Dissolved ICP-MS mg/L 0.0005 <0.0005 <0.0005 0,011 <0.01 0.1
Cobalt Dissolved ICP-MS mg/L 0.0001 <0.0001 0.0006 <0.01 0.05
Copper Dissolved ICP-MS mg/L 0.0005 <0.0005 0.0018 0.15 0.0044 0.02 0.2
Iron Dissolved ICP-MS mg/L 0,01 <0.01 <0.01 0.3 0.34 0.1
Lead Dissolved ICP-MS mg/L 0,0005 <0.0005 <0.0005 0.3 0.001 <0.003 0,05
Lithium Dissolved ICP-MS mg/L 0.0005 0.0092 0.0108 0.044 2.5
Magnesium Dissolved ICP-MS mg/L 0.05 4.07 2.4 24.9
Manganese Dissolved ICP-MS mg/L 0.0002 0.0713 0.0136 1.3 0.143 0.05
Mercury Dissolved ICP-MS mg/L 0.0005 <0.0005 <0.0005 0.001 0.00001 <0.0002 0.002
Molybdenum Dissolved ICP-MS mg/L 0.0001 0.0783 0,0572 0.15
Nickel Dissolved ICP-MS mg/L 0.0005 <0.0005 0.0317 0.026 0.03755 0.1
Phosphorus Dissolved ICP-MS mg/L 0,05 0.61 0.56
Potassium Dissolved ICP-MS mg/L 0.05 16.7 13.1 6.2
Selenium Dissolved ICP-MS mg/L 0.0005 0.005 0.0032 0.0046 -0.005 0.02
Silicon Dissolved ICP-MS m /L 0.05 0.75 0.4
Silver Dissolved ICP-MS mg/L 0.00008 <0.00008 <0.00008 0.00008
Sodium Dissolved ICP-MS mg/L 0.02 10.4 10.8 55.8
Strontium Dissolved ICP-MS mg/L 0.0002 0.391 0.392
Sulphur Dissolved ICP-MS mg/L 0.5 15 7.3
Tellurium Dissolved ICP-MS mg/L 0.0002 <0.0002 <0.0002
Thallium Dissolved ICP-MS mg/L 0.00005 <0.00005 <0.00005
Thorium Dissolved ICP-MS mg/L 0.0001 <0.0001 <0.0001
Tin Dissolved ICP-MS mg/L 0.0005 <0.0005 <0.0005
Titanium Dissolved ICP-MS mg/L 0.0005 0.0013 0.0013
Tungsten Dissolved ICP-MS mg/L 0.0001 <0.0001 <0.0001
Uranium Dissolved ICP-MS mg/L 0.00005 0.00022 0.00023 0.60
Vanadium Dissolved ICP-MS mg/L 0.001 <0.001 <0.001 0.1
Zinc Dissolved ICP-MS mg/L 0.001 -0,001 0.002 0.5 0,057 0.12 2
Zirconium Dissolved ICP-MS m IL 0.0001 <0.0001 I <0.0001
Bold-Exceedance of 40 CFR Part 440 Subpart J
Italics=Exceedance of water quality standard(chronic)for Grape Creek
'Water quality standard for several parameters are hardness dependent. The lower value for the two tailings filtrate samples is shown
DDS/dds ZephN_Dawson_TeiBngs__chamctedzation_FInaLReport,Feb.3,22,1:1 B PM Feb 2022