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Gold Ores, major discharger, Fairbanks, Alaska. NPDES permit AK0053643 expired May 31, 2023; its limits still apply. Last 12 months: no values over a limit, 10 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | daily minimum | ≥ 6.5 SU | all year | 001 |
| pH | daily maximum | ≤ 8.5 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Cyanide, weak acid, dissociable | monthly average | ≤ 2.8 ug/L | all year | 001 |
| Cyanide, weak acid, dissociable | daily maximum | ≤ 8.7 ug/L | all year | 001 |
| Sulfate, total [as SO4] | monthly average | report only (mg/L) | all year | 001 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | 001 |
| Arsenic, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Zinc, total recoverable | monthly average | ≤ 26 ug/L | all year | 001 |
| Zinc, total recoverable | daily maximum | ≤ 78 ug/L | all year | 001 |
| Cadmium, total recoverable | monthly average | ≤ .15 ug/L | all year | 001 |
| Cadmium, total recoverable | daily maximum | ≤ .31 ug/L | all year | 001 |
| Lead, total recoverable | monthly average | ≤ .92 ug/L | all year | 001 |
| Lead, total recoverable | daily maximum | ≤ 2.9 ug/L | all year | 001 |
| Copper, total recoverable | monthly average | ≤ 3.1 ug/L | all year | 001 |
| Copper, total recoverable | daily maximum | ≤ 8.7 ug/L | all year | 001 |
| Antimony, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Antimony, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Chloride | monthly average | report only (mg/L) | all year | 001 |
| Chloride | daily maximum | report only (mg/L) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/yr) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/yr) | all year | 001 |
| Flow, in conduit or thru treatment plant | year-to-date total | ≤ 3164 Mgal/yr | all year | 001 |
| Flow, in conduit or thru treatment plant | year-to-date total | ≤ 4800 Mgal/yr | all year | 001 |
| Mercury, total recoverable | monthly average | ≤ .01 ug/L | all year | 001 |
| Mercury, total recoverable | daily maximum | ≤ .02 ug/L | all year | 001 |
| pH | daily minimum | report only (SU) | all year | 002 |
| pH | daily maximum | report only (SU) | all year | 002 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 002 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Cyanide, weak acid, dissociable | monthly average | ≤ 2.8 ug/L | all year | 002 |
| Cyanide, weak acid, dissociable | daily maximum | ≤ 8.7 ug/L | all year | 002 |
| Sulfate, total [as SO4] | monthly average | report only (mg/L) | all year | 002 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | 002 |
| Arsenic, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Zinc, total recoverable | monthly average | ≤ 26 ug/L | all year | 002 |
| Zinc, total recoverable | daily maximum | ≤ 78 ug/L | all year | 002 |
| Cadmium, total recoverable | monthly average | ≤ .15 ug/L | all year | 002 |
| Cadmium, total recoverable | daily maximum | ≤ .31 ug/L | all year | 002 |
| Lead, total recoverable | monthly average | ≤ .92 ug/L | all year | 002 |
| Lead, total recoverable | daily maximum | ≤ 2.9 ug/L | all year | 002 |
| Copper, total recoverable | monthly average | ≤ 3.1 ug/L | all year | 002 |
| Copper, total recoverable | daily maximum | ≤ 8.7 ug/L | all year | 002 |
| Antimony, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Antimony, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Chloride | monthly average | report only (mg/L) | all year | 002 |
| Chloride | daily maximum | report only (mg/L) | all year | 002 |
| Flow, in conduit or thru treatment plant | year-to-date total | ≤ 4800 Mgal/yr | all year | 002 |
| Mercury, total recoverable | monthly average | ≤ .01 ug/L | all year | 002 |
| Mercury, total recoverable | daily maximum | ≤ .02 ug/L | all year | 002 |
Cited limits by parameter: Alaska's rules and the federal ones.
Same industry: the 7 Metal Mining permits in Alaska.
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