Clean Water Act discharge permit · NPDES CO0032751
CROSS AND CARIBOU MINES, Boulder County, CO: NPDES CO0032751 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 15Pollutants under a numeric limit
- 11Pollutants with an effluent exceedance
CROSS AND CARIBOU MINES, held by Calais Resources Inc, holds NPDES permit CO0032751, which discharges to Coon Track Creek/North Beaver Creek. EPA’s file records it issued December 19, 2005 and expiring January 31, 2011. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | CROSS AND CARIBOU MINES |
|---|---|
| Permittee as filed | Calais Resources Inc |
| NPDES ID | CO0032751 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | December 19, 2005 |
| Expiration date | January 31, 2011 |
| Address | Boulder County, CO 80466 |
| Receiving water | COON TRACK CREEK/NORTH BEAVER CREEK |
| Subwatershed | Middle Boulder Creek (HUC 101900050402) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 34Pollutants on file
- 15Under a numeric limit
- 34With a violation of any kind
- 11With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Lead, potentially dissolvd | 4 | 75 | 29 | March 31, 2022 | 5,428% over the limit |
| Silver, potentially dissolved | 8 | 83 | 26 | January 31, 2021 | 1,718% over the limit |
| Flow, in conduit or thru treatment plant | 24 | 250 | 23 | June 30, 2019 | 483% over the limit |
| Copper, potentially dissolved | 8 | 65 | 12 | April 30, 2021 | 347% over the limit |
| Cadmium, potentially dissolvd | 8 | 107 | 10 | October 31, 2021 | 223% over the limit |
| Zinc, potentially dissolved | 8 | 106 | 10 | October 31, 2021 | 86% over the limit |
| pH | 2 | 189 | 3 | November 30, 2021 | |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | 0 | 17 | 2 | March 31, 2021 | 46% over the limit |
| Solids, total suspended | 4 | 56 | 1 | October 31, 2021 | 30% over the limit |
| Mercury, total [as Hg] | 2 | 42 | 1 | December 31, 2017 | 50% over the limit |
| %Effect Static Renewal 7Day Chronic Pimephales promelas | 2 | 11 | 1 | December 31, 2008 | 100% over the limit |
| Oil and grease visual | 1 | 103 | 0 | ||
| Oil and grease | 1 | 102 | 0 | ||
| Chromium, hexavalent dissolved [as Cr] | 0 | 39 | 0 | ||
| Manganese, potentially dissolvd | 0 | 32 | 0 | ||
| Nickel, potentially dissolvd | 0 | 31 | 0 | ||
| Zinc, total recoverable | 0 | 29 | 0 | ||
| Selenium, potentially dissolvd | 0 | 29 | 0 | ||
| Temperature, water deg. centigrade | 0 | 28 | 0 | ||
| Cadmium, total recoverable | 0 | 28 | 0 | ||
| Lead, total recoverable | 0 | 28 | 0 | ||
| Copper, total recoverable | 0 | 28 | 0 | ||
| Mercury, total [low level] | 0 | 17 | 0 | ||
| Sulfide-hydrogen sulfide [undissociated] | 0 | 16 | 0 | ||
| Static Renewal 7 Day Chronic Pimephales promelas | 0 | 15 | 0 | ||
| Arsenic, total recoverable | 0 | 14 | 0 | ||
| Iron, total recoverable | 0 | 14 | 0 | ||
| Arsenic, potentially dissolved | 0 | 14 | 0 | ||
| Chromium, trivalent, potentially dissolvd | 0 | 14 | 0 | ||
| Chromium, trivalent total recoverable | 0 | 14 | 0 | ||
| Toxicity [chronic], Ceriodaphnia dubia | 2 | 10 | 0 | ||
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | 2 | 10 | 0 | ||
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 10 | 0 | ||
| Hardness, total [as CaCO3] | 0 | 6 | 0 |
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 4Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| August 16, 2023 | Monitoring Violations - Improper Analysis or Lab Error | ST6 |
| January 1, 2021 | Effluent Violations - Failed Toxicity Test | ST6 |
| January 1, 2021 | Monitoring Violations - Failure to Monitor for Toxicity Requirements | ST6 |
| October 1, 2019 | Effluent Violations - Failed Toxicity Test | ST6 |
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
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Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.