40 C.F.R. § 421.254
Any new source subject to this subpart shall achieve the following new source performance standards:
NSPS for the Primary Precious Metals and Mercury Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| mg/troy ounce of gold and silver smelted | ||
| Lead | 0.364 | 0.169 |
| Mercury | 0.195 | 0.078 |
| Silver | 0.377 | 0.156 |
| Zinc | 1.326 | 0.546 |
| Gold | 0.130 | |
| Oil and Grease | 13.000 | 13.000 |
| Total suspended solids | 19.500 | 15.600 |
| pH | (1) | (1) |
1 Within the range of 7.5 to 10.0 at all times.
NSPS for the Primary Precious Metals and Mercury Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| mg/troy ounce of silver reduced in solution | ||
| Lead | 0.112 | 0.052 |
| Mercury | 0.060 | 0.024 |
| Silver | 0.116 | 0.048 |
| Zinc | 0.408 | 0.168 |
| Gold | 0.040 | |
| Oil and Grease | 4.000 | 4.000 |
| Total suspended solids | 6.000 | 4.800 |
| pH | (1) | (1) |
1 Within the range of 7.5 to 10.0 at all times.
NSPS for the Primary Precious Metals and Mercury Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| mg/troy ounce of gold refined electrolytically | ||
| Lead | 5.544 | 2.574 |
| Mercury | 2.970 | 1.188 |
| Silver | 5.742 | 2.376 |
| Zinc | 20.200 | 8.316 |
| Gold | 1.980 | |
| Oil and Grease | 198.000 | 198.000 |
| Total suspended solids | 297.000 | 237.600 |
| pH | (1) | (1) |
1 Within the range of 7.5 to 10.0 at all times.
NSPS for the Primary Precious Metals and Mercury Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| mg/troy ounce of silver in electrolyte produced | ||
| Lead | 0.014 | 0.007 |
| Mercury | 0.008 | 0.003 |
| Silver | 0.015 | 0.006 |
| Zinc | 0.051 | 0.021 |
| Gold | 0.005 | |
| Oil and Grease | 0.500 | 0.500 |
| Total suspended solids | 0.750 | 0.600 |
| pH | (1) | (1) |
1 Within the range of 7.5 to 10.0 at all times.
NSPS for the Primary Precious Metals and Mercury Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| mg/kg (pounds per million pounds) of mercury condensed | ||
| Lead | 6.160 | 2.860 |
| Mercury | 3.300 | 1.320 |
| Silver | 6.380 | 2.640 |
| Zinc | 22.440 | 9.240 |
| Gold | 2.200 | |
| Oil and Grease | 220.000 | 220.000 |
| Total suspended solids | 330.000 | 264.000 |
| pH | (1) | (1) |
1 Within the range of 7.5 to 10.0 at all times.
NSPS for the Primary Precious Metals and Mercury Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| mg/kg (pounds per million pounds) of mercury condensed | ||
| Lead | 4.928 | 2.288 |
| Mercury | 2.640 | 1.056 |
| Silver | 5.104 | 2.112 |
| Zinc | 17.950 | 7.392 |
| Gold | 1.760 | |
| Oil and Grease | 176.000 | 176.000 |
| Total suspended solids | 264.000 | 211.200 |
| pH | (1) | (1) |
1 Within the range of 7.5 to 10.0 at all times.
NSPS for the Primary Precious Metals and Mercury Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| mg/kg (pounds per million pounds) or mercury condensed | ||
| Lead | 1.162 | 0.540 |
| Mercury | 0.623 | 0.249 |
| Silver | 1.204 | 0.498 |
| Zinc | 4.233 | 1.743 |
| Gold | 0.415 | |
| Oil and Grease | 41.500 | 41.500 |
| Total suspended solids | 62.250 | 49.800 |
| pH | (1) | (1) |
1 Within the range of 7.5 to 10.0 at all times.
NSPS for the Primary Precious Metals and Mercury Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| mg/kg (pounds per million pounds) of mercury condensed | ||
| Lead | 3.864 | 1.794 |
| Mercury | 2.070 | 0.828 |
| Silver | 4.002 | 1.656 |
| Zinc | 14.080 | 5.796 |
| Gold | 1.380 | |
| Oil and Grease | 138.000 | 138.000 |
| Total suspended solids | 207.000 | 165.600 |
| pH | (1) | (1) |
1 Within the range of 7.5 to 10.0 at all times.
NSPS for the Primary Precious Metals and Mercury Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| mg/kg (pounds per million pounds) of Mercury condensed | ||
| Lead | 0.392 | 0.182 |
| Mercury | 0.210 | 0.084 |
| Silver | 0.406 | 0.168 |
| Zinc | 1.428 | 0.588 |
| Gold | 0.140 | |
| Oil and Grease | 14.000 | 14.000 |
| Total suspended solids | 21.000 | 16.800 |
| pH | (1) | (1) |
1 Within the range of 7.5 to 10.0 at all times.
40 C.F.R. §421.254