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------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/troy ounce of
precious metals,
including silver,
incinerated or smelted
--------------Copper........................................ 5.760 2.745Cyanide (total)............................... 0.900 0.360Zinc.......................................... 4.590 1.890Combined metals............................... 1.350 ...........Ammonia (as N)................................ 599.900 263.700------------------------------------------------------------------------
(b) Raw material granulation.
BAT Limitations for the Secondary Precious Metals Subcategory------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/troy ounce of
precious metals in the
granulated raw material
--------------Copper........................................ 0.819 0.390Cyanide (total)............................... 0.128 0.051Zinc.......................................... 0.653 0.269Combined 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------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/liter of spent
plating solution used as
a raw material
--------------Copper........................................ 1.280 0.610Cyanide (total)............................... 0.200 0.080Zinc.......................................... 1.020 0.420Gold..........................................Combined metals............................... 0.300 ...........Ammonia (as N)................................ 133.300 58.600------------------------------------------------------------------------
(d) Spent cyanide stripping solutions.
BAT Limitations for the Secondary Precious Metals Subcategory------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/troy ounce of gold
produced by cyanide
stripping
--------------Copper........................................ 4.736 2.257Cyanide (total)............................... 0.740 0.296Zinc.......................................... 3.774 1.554Combined 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------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/troy ounce of
precious metals,
including silver,
produced in refinery
--------------Copper........................................ 1.280 0.610Cyanide (total)............................... 0.200 0.080Zinc.......................................... 1.020 0.420Combined 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------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/troy ounce of gold
produced by solvent
extraction
--------------Copper........................................ 0.806 0.384Cyanide (total)............................... 0.126 0.050Zinc.......................................... 0.643 0.265Combined metals............................... 0.189 ...........Ammonia (as N)................................ 83.980 36.920------------------------------------------------------------------------
(g) Gold spent electrolyte.
BAT Limitations for the Secondary Precious Metals Subcategory------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/troy ounce of gold
produced by electrolysis
--------------Copper........................................ 0.0111 0.0053Cyanide (total)............................... 0.0017 0.0007Zinc.......................................... 0.0089 0.0037Combined metals............................... 0.0030 ...........
Ammonia (as N)................................ 1.1600 0.5100------------------------------------------------------------------------
(h) Gold precipitation and filtration.
BAT Limitations for the Secondary Precious Metals Subcategory------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/troy ounce of gold
precipitated
--------------Copper........................................ 5.632 2.684Cyanide (total)............................... 0.880 0.352Zinc.......................................... 4.488 1.848Combined metals............................... 1.320 ...........Ammonia (as N)................................ 586.500 257.800------------------------------------------------------------------------
(i) Platinum precipitation and filtration.
BAT Limitations for the Secondary Precious Metals Subcategory------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/troy ounce of
platinum precipitated
--------------Copper........................................ 6.656 3.172Cyanide (total)............................... 1.040 0.416Zinc.......................................... 5.304 2.184Combined metals............................... 0.560 ...........Ammonia (as N)................................ 693.200 304.700------------------------------------------------------------------------
(j) Palladium precipitation and filtration.
BAT Limitations for the Secondary Precious Metals Subcategory------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/troy ounce of
palladium precipitated
--------------Copper........................................ 7.680 3.660Cyanide (total)............................... 1.200 .480Zinc.......................................... 6.120 2.520Combined 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------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/troy ounce of other
platinum group metals
precipitated
--------------Copper........................................ 6.656 3.172Cyanide (total)............................... 1.040 0.416Zinc.......................................... 5.304 2.184Combined 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------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/troy ounce of gold
contained in PGC product
--------------Copper........................................ 1.152 0.549Cyanide (total)............................... 0.180 0.072Zinc.......................................... 0.918 0.378Combined metals............................... 0.270 ...........Ammonia (as N)................................ 120.000 52.740------------------------------------------------------------------------
(m) Equipment and floor wash.
BAT Limitations for the Secondary Precious Metals Subcategory------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
mg/troy ounce of
precious metals,
including silver,
produced in refinery
--------------Copper........................................ 0.000 0.000Cyanide (total)............................... 0.000 0.000Zinc.......................................... 0.000 0.000Combined metals............................... 0.000 ...........Ammonia (as N)................................ 0.000 0.000------------------------------------------------------------------------
(n) Preliminary treatment.
BAT Limitations for the Secondary Precious Metals Subcategory------------------------------------------------------------------------
Maximum for
Pollutant or pollutant property Maximum for monthly
any 1 day average------------------------------------------------------------------------
Mg/troy ounce of total
precious metals produced
through this operation
--------------Copper........................................ 64.000 30.500Cyanide (Total)............................... 10.000 4.000Zinc.......................................... 51.000 21.000Combined metals............................... 15.000 ...........Ammonia (as N)................................ 6665.000 2930.000------------------------------------------------------------------------ [50 FR 38365, Sept. 20, 1985, as amended at 55 FR 31706-31708, Aug. 3, 1990; 55 FR 36932, Sept. 7, 1990]