40 CFR 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)

1 Within 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)

1 Within 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)

1 Within 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)

1 Within the range of 7.5 to 10.0 at all times.

(e) Refinery wet air pollution control. 2

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)

1 Within 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)

1 Within 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)

1 Within 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)

1 Within 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)

1 Within 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)

1 Within 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)

1 Within 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)

1 Within 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)

1 Within 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)

1 Within the range of 7.5 to 10.0 at all times.