Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart shall achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable technology currently available:
(a) Furnace wet air pollution control.
BPT Limitations for the Secondary Precious Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of precious metals, including silver, incinerated or smelted | ||
| Copper | 136.400 | 71.800 |
| Cyanide (total) | 20.820 | 8.616 |
| Zinc | 104.800 | 43.800 |
| Ammonia (as N) | 9,571.000 | 4,207.000 |
| Combined metals | 21.54 | |
| Total suspended solids | 2,944.000 | 1,400.000 |
| pH | (1) | (1) |
1Within the range of 7.5 to 10.0 at all times.
(b) Raw material granulation.
BPT Limitations for the Secondary Precious Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of precious metal in the granulated raw material | ||
| Copper | 12.050 | 6.340 |
| Cyanide (total) | 1.839 | 0.761 |
| Zinc | 9.256 | 3.867 |
| Ammonia (as N) | 845.100 | 371.500 |
| Combined metals | 1.902 | |
| Total suspended solids | 259.900 | 123.600 |
| pH | (1) | (1) |
1Within the range of 7.5 to 10.0 at all times.
(c) Spent plating solutions.
BPT Limitations for the Secondary Precious Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/liter of spent plating solution used as a raw material | ||
| Copper | 1.900 | 1.000 |
| Cyanide (total) | 0.290 | 0.120 |
| Zinc | 1.460 | 0.610 |
| Ammonia (as N) | 133.300 | 58.600 |
| Combined metals | 0.300 | |
| Total suspended solids | 41.000 | 19.500 |
| pH | (1) | (1) |
1Within the range of 7.5 to 10.0 at all times.
(d) Spent cyanide stripping solutions.
BPT Limitations for the Secondary Precious Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of gold produced by cyanide stripping | ||
| Copper | 7.030 | 3.700 |
| Cyanide (total) | 1.073 | 0.444 |
| Zinc | 5.402 | 2.257 |
| Ammonia (as N) | 493.200 | 216.800 |
| Combined metals | 1.110 | |
| Total suspended solids | 151.700 | 72.150 |
| pH | (1) | (1) |
1Within the range of 7.5 to 10.0 at all times.
(e) Refinery wet air pollution control.2
2This allowance applies to either acid or alkaline wet air pollution control scrubbers. If both acid and alkaline wet air pollution control scrubbers are present in a particular facility the same allowance applies to each.
BPT Limitations for the Secondary Precious Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of precious metals, including silver, produced in refinery | ||
| Copper | 39.900 | 21.000 |
| Cyanide (total) | 6.090 | 2.520 |
| Zinc | 30.660 | 12.810 |
| Ammonia (as N) | 2,799.000 | 1,231.000 |
| Combined metals | 6.300 | |
| Total suspended solids | 861.000 | 409.500 |
| pH | (1) | (1) |
1Within the range of 7.5 to 10.0 at alltimes.
(f) Gold solvent extraction raffinate and wash water.
BPT Limitations for the Secondary Precious Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of gold produced by solvent extraction | ||
| Copper | 1.197 | 0.630 |
| Cyanide (total) | 0.183 | 0.076 |
| Zinc | 0.920 | 0.384 |
| Ammonia (as N) | 83.980 | 36.920 |
| Combined metals | 0.189 | |
| Total suspended solids | 25.830 | 12.290 |
| pH | (1) | (1) |
1Within the range of 7.5 to 10.0 at all times.
(g) Gold spent electrolyte.
BPT Limitations for the Secondary Precious Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of gold produced by electrolysis | ||
| Copper | 0.017 | 0.009 |
| Cyanide (total) | 0.003 | 0.001 |
| Zinc | 0.103 | 0.005 |
| Ammonia (as N) | 1.160 | 0.510 |
| Combined metals | 0.003 | |
| Total suspended solids | 0.357 | 0.170 |
| pH | (1) | (1) |
1Within the range of 7.5 to 10.0 at all times.
(h) Gold precipitation and filtration.
BPT Limitations for the Secondary Precious Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of gold precipitated | ||
| Copper | 8.360 | 4.400 |
| Cyanide (total) | 1.276 | 0.528 |
| Zinc | 6.424 | 2.684 |
| Ammonia (as N) | 586.500 | 257.800 |
| Combined metals | 1.320 | |
| Total suspended solids | 180.400 | 85.800 |
| pH | (1) | (1) |
1Within the range of 7.5 to 10.0 at all times.
(i) Platinum precipitation and filtration.
BPT Limitations for the Secondary Precious Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of platinum precipitated | ||
| Copper | 9.880 | 5.200 |
| Cyanide (total) | 1.508 | 0.624 |
| Zinc | 7.592 | 3.172 |
| Ammonia (as N) | 693.200 | 304.700 |
| Combined metals | 1.560 | |
| Total suspended solids | 213.200 | 101.400 |
| pH | (1) | (1) |
1Within the range of 7.5 to 10.0 at all times.
(j) Palladium precipitation and filtration.
BPT Limitations for the Secondary Precious Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of palladium precipitated | ||
| Copper | 11.400 | 6.000 |
| Cyanide (total) | 1.740 | 0.720 |
| Zinc | 8.760 | 3.660 |
| Ammonia (as N) | 799.800 | 351.600 |
| Combined metals | 1.800 | |
| Total suspended solids | 246.000 | 117.000 |
| pH | (1) | (1) |
1Within the range of 7.5 to 10.0 at all times.
(k) Other platinum group metals precipitation and filtration.
BPT Limitations for the Secondary Precious Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of other platinum group metals precipitated | ||
| Copper | 9.880 | 5.200 |
| Cyanide (total) | 1.508 | 0.624 |
| Zinc | 7.592 | 3.172 |
| Ammonia (as N) | 693.200 | 304.700 |
| Combined metals | 1.560 | |
| Total suspended solids | 213.200 | 101.400 |
| pH | (1) | (1) |
1Within the range of 7.5 to 10.0 at all times.
(l) Spent solution from PGC salt production.
BPT Limitations for the Secondary Precious Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of gold contained in PGC product | ||
| Copper | 1.710 | 0.900 |
| Cyanide (total) | 0.261 | 0.108 |
| Zinc | 1.314 | 0.549 |
| Ammonia (as N) | 120.000 | 52.740 |
| Combined metals | 0.270 | |
| Total suspended solids | 36.900 | 17.550 |
| pH | (1) | (1) |
1Within the range of 7.5 to 10.0 at all times.
(m) Equipment and floor wash.
BPT Limitations for the Secondary Precious Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of precious metals, including silver, produced in refinery | ||
| Copper | 0.000 | 0.000 |
| Cyanide (total) | 0.000 | 0.000 |
| Zinc | 0.000 | 0.000 |
| Ammonia (as N) | 0.000 | 0.000 |
| Combined metals | 0.000 | 0.000 |
| Total suspended solids | 0.000 | 0.000 |
| pH | (1) | (1) |
1Within the range of 7.5 to 10.0 at all times.
(n) Preliminary treatment.
BPT Limitations for the Secondary Precious Metals Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/troy ounce of total precious metals produced through this operation | ||
| Copper | 95.000 | 50.000 |
| Cyanide (Total) | 14.500 | 6.000 |
| Zinc | 73.000 | 30.500 |
| Ammonia (as N) | 6665.000 | 2930.000 |
| Combined Metals | 15.000 | |
| Total Suspended Solids | 2050.000 | 975.000 |
| pH | (1) | (1) |
1Within the range of 7.5 to 10.0 at all times.
[50 FR 38365, Sept. 20, 1985, as amended at 55 FR 31705, 31706, Aug. 3, 1990]
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