Regulations last checked for updates: May 01, 2025
Title 40 - Protection of Environment last revised: Nov 01, 2025
§ 421.260 - Applicability: Description of the secondary precious metals subcategory.
The provisions of this subpart are applicable to discharges resulting from the production of precious metals at secondary precious metals facilities.
§ 421.261 - Specialized definitions.
For the purpose of this subpart:
(a) Except as provided below, the general definitions, abbreviations, and methods of analysis set forth in 40 CFR part 401 shall apply to this subpart.
(b) The term precious metals shall mean gold, platinum, palladium, rhodium, iridium, osmium, and ruthenium.
(c) The term Combined Metals, shall mean the total of gold, platinum and palladium.
[50 FR 38365, Sept. 20, 1985, as amended at 55 FR 31705, Aug. 3, 1990]
§ 421.262 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.
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)
|
(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)
|
(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)
|
(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)
|
(e) Refinery wet air pollution control.
2
2 This 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)
|
(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)
|
(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)
|
(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)
|
(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)
|
(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)
|
(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)
|
(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)
|
(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)
|
(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)
|
§ 421.263 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.
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 available technology economically achievable:
(a) Furnace wet air pollution control.
BAT 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 | 5.760 | 2.745
|
| Cyanide (total) | 0.900 | 0.360
|
| Zinc | 4.590 | 1.890
|
| Combined metals | 1.350 | |
| Ammonia (as N) | 599.900 | 263.700 |
(b) Raw material granulation.
BAT 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 in the granulated raw material
|
| Copper | 0.819 | 0.390
|
| Cyanide (total) | 0.128 | 0.051
|
| Zinc | 0.653 | 0.269
|
| Combined metals | 0.192 | |
| Palladium | 0.064 | |
| Platinum | 0.064 | |
| Ammonia (as N) | 85.310 | 37.500 |
(c) Spent plating solutions.
BAT 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 | 1.280 | 0.610
|
| Cyanide (total) | 0.200 | 0.080
|
| Zinc | 1.020 | 0.420
|
| Gold
| | |
| Combined metals | 0.300 | |
| Ammonia (as N) | 133.300 | 58.600 |
(d) Spent cyanide stripping solutions.
BAT 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 | 4.736 | 2.257
|
| Cyanide (total) | 0.740 | 0.296
|
| Zinc | 3.774 | 1.554
|
| Combined metals | 1.110 | |
| Ammonia (as N) | 493.200 | 216.800 |
(e) Refinery wet air pollution control
2.
2 This 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.
BAT 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 | 1.280 | 0.610
|
| Cyanide (total) | 0.200 | 0.080
|
| Zinc | 1.020 | 0.420
|
| Combined metals | 0.300 | |
| Ammonia (as N) | 133.300 | 58.600 |
(f) Gold solvent extraction raffinate and wash water.
BAT 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 | 0.806 | 0.384
|
| Cyanide (total) | 0.126 | 0.050
|
| Zinc | 0.643 | 0.265
|
| Combined metals | 0.189 | |
| Ammonia (as N) | 83.980 | 36.920 |
(g) Gold spent electrolyte.
BAT 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 | 0.0111 | 0.0053
|
| Cyanide (total) | 0.0017 | 0.0007
|
| Zinc | 0.0089 | 0.0037
|
| Combined metals | 0.0030 | |
| Ammonia (as N) | 1.1600 | 0.5100 |
(h) Gold precipitation and filtration.
BAT 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 | 5.632 | 2.684
|
| Cyanide (total) | 0.880 | 0.352
|
| Zinc | 4.488 | 1.848
|
| Combined metals | 1.320 | |
| Ammonia (as N) | 586.500 | 257.800 |
(i) Platinum precipitation and filtration.
BAT 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 | 6.656 | 3.172
|
| Cyanide (total) | 1.040 | 0.416
|
| Zinc | 5.304 | 2.184
|
| Combined metals | 0.560 | |
| Ammonia (as N) | 693.200 | 304.700 |
(j) Palladium precipitation and filtration.
BAT 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 | 7.680 | 3.660
|
| Cyanide (total) | 1.200 | .480
|
| Zinc | 6.120 | 2.520
|
| Combined metals | 1.800 | |
| Ammonia (as N) | 799.800 | 351.600 |
(k) Other platinum group metals precipitation and filtration.
BAT 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 | 6.656 | 3.172
|
| Cyanide (total) | 1.040 | 0.416
|
| Zinc | 5.304 | 2.184
|
| Combined metals | 1.560 | |
| Ammonia (as N) | 693.200 | 304.700 |
(l) Spent solutions from PGC salt production.
BAT 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 | 1.152 | 0.549
|
| Cyanide (total) | 0.180 | 0.072
|
| Zinc | 0.918 | 0.378
|
| Combined metals | 0.270 | |
| Ammonia (as N) | 120.000 | 52.740 |
(m) Equipment and floor wash.
BAT 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
|
| Combined metals | 0.000 | |
| Ammonia (as N) | 0.000 | 0.000 |
(n) Preliminary treatment.
BAT 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 | 64.000 | 30.500
|
| Cyanide (Total) | 10.000 | 4.000
|
| Zinc | 51.000 | 21.000
|
| Combined metals | 15.000 | |
| Ammonia (as N) | 6665.000 | 2930.000 |
§ 421.264 - Standards of performance for new sources.
Any new source subject to this subpart shall achieve the following new source performance standards:
(a) Furnace wet air pollution control.
NSPS 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 | 5.760 | 2.745
|
| Cyanide (total) | 0.900 | 0.360
|
| Zinc | 4.590 | 1.890
|
| Combined metals | 1.350 | |
| Ammonia (as N) | 599.900 | 263.700
|
| Total suspended solids | 67.500 | 54.000
|
| pH | (
1) | (
1)
|
(b) Raw material granulation.
NSPS 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 in the granulated raw material
|
| Copper | 0.819 | 0.390
|
| Cyanide (total) | 0.128 | 0.051
|
| Zinc | 0.653 | 0.269
|
| Combined metals | 0.192 | |
| Ammonia (as N) | 85.310 | 37.500
|
| Total suspended solids | 9.600 | 7.680
|
| pH | (
1) | (
1)
|
(c) Spent plating solutions.
NSPS 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 | 1.280 | 0.610
|
| Cyanide (total) | 0.200 | 0.080
|
| Zinc | 1.020 | 0.420
|
| Combined metals | 0.300 | |
| Ammonia (as N) | 133.300 | 58.600
|
| Total suspended solids | 15.000 | 12.000
|
| pH | (
1) | (
1)
|
(d) Spent cyanide stripping solutions.
NSPS 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 | 4.736 | 2.257
|
| Cyanide (total) | 0.740 | 0.296
|
| Zinc | 3.774 | 1.554
|
| Combined metals | 1.11 | |
| Ammonia (as N) | 493.200 | 216.800
|
| Total suspended solids | 55.500 | 44.400
|
| pH | (
1) | (
1)
|
(e) Refinery wet air pollution control
2.
2 This 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.
NSPS 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 | 1.280 | 0.610
|
| Cyanide (total) | 0.200 | 0.080
|
| Zinc | 1.020 | 0.420
|
| Combined metals | 0.300 | |
| Ammonia (as N) | 133.300 | 58.600
|
| Total suspended solids | 15.000 | 12.000
|
| pH | (
1) | (
1)
|
(f) Gold solvent extraction raffinate and wash water.
NSPS 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 | 0.806 | 0.384
|
| Cyanide (total) | 0.126 | 0.050
|
| Zinc | 0.643 | 0.265
|
| Combined metals | 0.189 | |
| Ammonia (as N) | 83.980 | 36.920
|
| Total suspended solids | 9.450 | 7.560
|
| pH | (
1) | (
1)
|
(g) Gold spent electrolyte.
NSPS 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 | 0.011 | 0.005
|
| Cyanide (total) | 0.002 | 0.001
|
| Combined metals | 0.003 | |
| Zinc | 0.009 | 0.004
|
| Ammonia (as N) | 1.160 | 0.510
|
| Total suspended solids | 0.131 | 0.104
|
| pH | (
1) | (
1)
|
(h) Gold precipitation and filtration.
NSPS 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 | 5.632 | 2.684
|
| Cyanide (total) | 0.880 | 0.352
|
| Zinc | 4.488 | 1.848
|
| Combined metals | 1.320 | |
| Ammonia (as N) | 586.500 | 257.800
|
| Total suspended solids | 66.00 | 52.800
|
| pH | (
1) | (
1)
|
(i) Platinum precipitation and filtration.
NSPS 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 | 6.656 | 3.172
|
| Cyanide (total) | 1.040 | 0.416
|
| Zinc | 5.304 | 2.184
|
| Combined metals | 1.560 | |
| Ammonia (as N) | 693.200 | 304.700
|
| Total suspended solids | 78.000 | 62.400
|
| pH | (
1) | (
1)
|
(j) Palladium precipitation and filtration.
NSPS 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 | 7.680 | 3.660
|
| Cyanide (total) | 1.200 | 0.480
|
| Zinc | 6.1200 | 2.520
|
| Combined metals | 1.800 | |
| Ammonia (as N) | 799.800 | 351.600
|
| Total suspended solids | 90.000 | 72.000
|
| pH | (
1) | (
1)
|
(k) Other platinum group metals precipitation and filtration.
NSPS 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 | 6.656 | 3.172
|
| Cyanide (total) | 1.040 | 0.416
|
| Zinc | 5.304 | 2.184
|
| Combined metals | 1.560 | |
| Ammonia (as N) | 693.200 | 304.700
|
| Total suspended solids | 78.000 | 62.400
|
| pH | (
1) | (
1)
|
(l) Spent solution from PGC salt production.
NSPS 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 | 1.152 | 0.549
|
| Cyanide (total) | 0.180 | 0.072
|
| Zinc | 0.918 | 0.378
|
| Combined metals | 0.270 | |
| Ammonia (as N) | 120.000 | 52.740
|
| Total suspended solids | 13.500 | 10.800
|
| pH | (
1) | (
1)
|
(m) Equipment and floor wash.
NSPS 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
|
| Combined metals | 0.000 | |
| Ammonia (as N) | 0.000 | 0.000
|
| Total suspended solids | 0.000 | 0.000
|
| pH | (
1) | (
1)
|
(n) Preliminary treatment.
NSPS 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 | 64.000 | 30.500
|
| Cyanide (Total) | 10.000 | 4.000
|
| Zinc | 51.000 | 21.000
|
| Combined metals | 15.000 | |
| Ammonia (as N) | 6665.000 | 2930.000
|
| Total Suspended Solids | 750.000 | 600.000
|
| pH | (
1) | (
1)
|
§ 421.265 - Pretreatment standards for existing sources.
Except as provided in 40 CFR 403.7 and 403.13, any existing source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for existing sources. The mass of wastewater pollutants in secondary precious metals process wastewater introduced into a POTW must not exceed the following values:
(a) Furnace wet air pollution control.
PSES 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 | 5.760 | 2.745
|
| Cyanide (total) | 0.900 | 0.360
|
| Zinc | 4.590 | 1.890
|
| Combined metals | 1.350 | |
| Ammonia (as N) | 599.900 | 263.700 |
(b) Raw material granulation.
PSES 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 in the granulated raw material
|
| Copper | 0.819 | 0.390
|
| Cyanide (total) | 0.128 | 0.051
|
| Zinc | 0.653 | 0.269
|
| Combined metals | 0.192 | |
| Ammonia (as N) | 85.310 | 37.500 |
(c) Spent plating solutions.
PSES 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 | 1.280 | 0.610
|
| Cyanide (total) | 0.200 | 0.080
|
| Zinc | 1.020 | 0.420
|
| Combined metals | 0.300 | |
| Ammonia (as N) | 133.300 | 58.600 |
(d) Spent Cyanide stripping solutions.
PSES 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 | 4.736 | 2.257
|
| Cyanide (total) | 0.740 | 0.296
|
| Zinc | 3.774 | 1.554
|
| Combined metals | 1.110 | |
| Ammonia (as N) | 493.200 | 216.800 |
(e) Refinery wet air pollution control.
1
1 This 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.
PSES 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 | 1.280 | 0.610
|
| Cyanide (total) | 0.200 | 0.080
|
| Zinc | 1.020 | 0.420
|
| Combined metals | 0.300 | |
| Ammonia (as N) | 133.300 | 58.600 |
(f) Gold solvent extraction raffinate and wash water.
PSES 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 | 0.806 | 0.384
|
| Cyanide (total) | 0.126 | 0.050
|
| Zinc | 0.643 | 0.265
|
| Combined metals | 0.189 | |
| Ammonia (as N) | 83.980 | 36.920 |
(g) Gold spent electrolyte.
PSES 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 | 0.011 | 0.005
|
| Cyanide (total) | 0.002 | 0.001
|
| Zinc | 0.009 | 0.004
|
| Combined metals | 0.003 | |
| Ammonia (as N) | 1.160 | 0.510 |
(h) Gold precipitation and filtration.
PSES 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 | 5.632 | 2.684
|
| Cyanide (total) | 0.880 | 0.352
|
| Zinc | 4.488 | 1.848
|
| Combined metals | 1.320 | |
| Ammonia (as N) | 586.500 | 257.800 |
(i) Platinum precipitation and filtration.
PSES 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 | 6.656 | 3.172
|
| Cyanide (total) | 1.040 | 0.416
|
| Zinc | 5.304 | 2.184
|
| Combined metals | 1.560 | |
| Ammonia (as N) | 693.200 | 304.700 |
(j) Palladium precipitation and filtration.
PSES 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 | 7.680 | 3.660
|
| Cyanide (total) | 1.200 | 0.480
|
| Zinc | 6.120 | 2.520
|
| Combined metals | 1.800 | |
| Ammonia (as N) | 799.800 | 351.600 |
(k) Other platinum group metals precipitation and filtration.
PSES 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 | 6.656 | 3.172
|
| Cyanide (total) | 1.040 | 0.416
|
| Zinc | 5.304 | 2.184
|
| Combined metals | 1.560 | |
| Ammonia (as N) | 693.200 | 304.700 |
(l) Spent solution from PGC salt production.
PSES 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 | 1.152 | 0.549
|
| Cyanide (total) | 0.180 | 0.072
|
| Zinc | 0.918 | 0.378
|
| Combined metals | 0.270 | |
| Ammonia (as N) | 120.000 | 52.740 |
(m) Equipment and floor wash.
PSES 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
|
| Combined metals | 0.000 | |
| Ammonia (as N) | 0.000 | 0.000 |
(n) Preliminary Treatment.
PSES 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 | 64.000 | 30.500
|
| Cyanide (Total) | 10.000 | 4.000
|
| Zinc | 51.000 | 21.000
|
| Combined Metals | 15.000 | |
| Ammonia (as N) | 6665.000 | 2930.000 |
§ 421.266 - Pretreatment standards for new sources.
Except as provided in 40 CFR 403.7, any new source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for new sources. The mass of wastewater pollutants in secondary precious metals process wastewater introduced into a POTW shall not exceed the following values:
(a) Furnace wet air pollution control.
PSNS 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 | 5.760 | 2.745
|
| Cyanide (total) | 0.900 | 0.360
|
| Zinc | 4.590 | 1.890
|
| Combined metals | 1.350 | |
| Ammonia (as N) | 599.900 | 263.700 |
(b) Raw material granulation.
PSNS 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, in the granulated raw material
|
| Copper | 0.819 | 0.390
|
| Cyanide (total) | 0.128 | 0.051
|
| Zinc | 0.653 | 0.269
|
| Combined metals | 0.192 | |
| Ammonia | 85.310 | 37.500 |
(c) Spent plating solutions.
PSNS 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 materail
|
| Copper | 1.280 | 0.610
|
| Cyanide (total) | 0.200 | 0.080
|
| Zinc | 1.020 | 0.420
|
| Combined metals | 0.300 | |
| Ammonia (as N) | 133.300 | 58.600 |
(d) Spent cyanide stripping solutions.
PSNS 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 | 4.736 | 2.257
|
| Cyanide (total) | 0.740 | 0.296
|
| Zinc | 3.774 | 1.554
|
| Combined metals | 1.110 | |
| Ammonia (as N) | 493.200 | 216.800 |
(e) Refinery Wet Air Pollution Control.
1
1 This 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.
PSNS 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 | 1.280 | 0.610
|
| Cyanide (total) | 0.200 | 0.080
|
| Zinc | 1.020 | 0.420
|
| Combined metals | 0.300 | |
| Ammonia (as N) | 133.300 | 58.600 |
(f) Gold solvent extraction raffinate and wash water.
PSNS 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 | 0.806 | 0.384
|
| Cyanide (total) | 0.126 | 0.050
|
| Zinc | 0.643 | 0.265
|
| Combined metals | 0.189 | |
| Ammonia (as N) | 83.980 | 36.920 |
(g) Gold spent electrolyte.
PSNS 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 | 0.011 | 0.005
|
| Cyanide (total) | 0.002 | 0.001
|
| Zinc | 0.009 | 0.004
|
| Combined metals | 0.300 | |
| Ammonia (as N) | 1.160 | 0.510 |
(h) Gold precipitation and filtration.
PSNS 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 | 5.632 | 2.684
|
| Cyanide (total) | 0.880 | 0.352
|
| Zinc | 4.488 | 1.848
|
| Combined metals | 1.320 | |
| Ammonia (as N) | 586.500 | 257.800 |
(i) Platinum precipitation and filtration.
PSNS 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 | 6.656 | 3.172
|
| Cyanide (total) | 1.040 | 0.416
|
| Zinc | 5.304 | 2.184
|
| Combined metals | 1.560 | |
| Ammonia (as N) | 693.200 | 304.700 |
(j) Palladium precipitation and filtration.
PSNS 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 | 7.680 | 3.660
|
| Cyanide (Total) | 1.200 | 0.480
|
| Zinc | 6.120 | 2.520
|
| Combined Metals | 1.800 | |
| Ammonia (as N) | 799.800 | 351.600 |
(k) Other platinum group metals precipitation and filtration.
PSNS 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 | 6.656 | 3.172
|
| Cyanide (total) | 1.040 | 0.416
|
| Zinc | 5.304 | 2.184
|
| Combined metals | 1.560 | |
| Ammonia (as N) | 693.200 | 304.700 |
(l) Spent solution from PGC salt production.
PSNS 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 | 1.152 | 0.549
|
| Cyanide (total) | 0.180 | 0.072
|
| Zinc | 0.918 | 0.378
|
| Combined metals | 0.270 | |
| Ammonia (as N) | 120.000 | 52.740 |
(m) Equipment and floor wash.
PSNS 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
|
| Combined metals | 0.000 | |
| Ammonia (as N) | 0.000 | 0.000 |
(n) Preliminary treatment.
PSNS for the Secondary Precious Metals Subcategory
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly averge
|
|---|
| mg/troy ounce of total precious metals produced through this operation
|
| Copper | 64.000 | 30.500
|
| Cyanide (Total) | 10.000 | 4.000
|
| Zinc | 51.000 | 21.000
|
| Combined Metals | 15.000 | |
| Ammonia (as N) | 6665.000 | 2930.000 |
§ 421.267 - [Reserved]
authority: Secs. 301, 304 (b), (c), (e), and (g), 306 (b) and (c), 307 (b) and (c), 308 and 501 of the Clean Water Act (the Federal Water Pollution Control Act Amendments of 1972, as amended by the Clean Water Act of 1977) and the Water Quality Act of 1987 (the “Act”);
33 U.S.C. 1311,
1314,
c,
e,
and, 1316 (b) and
c, 1317 (b) and
c,
1318; 86 Stat. 816, Pub. L. 92-500; 91 Stat. 1567, Pub. L. 95-217; 101 Stat. 7, Pub. L. 100-4
source: 49 FR 8790, Mar. 8, 1984, unless otherwise noted.
cite as: 40 CFR 421.262