Issues by Water Year: 2008

2008 Annual Monitoring Report Summary

While underground mining reduces the impacts when compared to the previously proposed open pit, significant water quality and quantity issues remain.

In April 2009, the first annual meeting took place to review the Water Year 2008 monitoring reports. The purpose of the meeting was to provide input towards the discussion of the adequacy of the monitoring plans, to monitor the hydrologic aspects of the Buckhorn Mine and mitigation, and to suggest modifications that might be needed for adaptive management. The annual reporting requirements are extensive.

After brief introductions including representatives from Washington State Department of Ecology, and Washington State Fish & Wildlife, the USDA Forest Service, Crown/Kinross, Golder Associates and OHA, OHA started the meeting off with an overview of our issues and concerns and a presentation by our consultant Ann Maest of Stratus Consulting.

OHA expressed grave concern over the failure of Crown/Kinross to submit reports required by the Hydrologic Monitoring Plan that are needed to understand the impacts of the mine. Crown/Kinross consultant, Golder submitted nine technical memos to the agencies that related to the Adaptive Management Plan. The memos were not integrated and were poorly organized. There was no table of contents or index and it was difficult to discern if requirements were met. We expressed our concern and frustration that there was not enough time to accomplish the objectives of the annual coordination meeting in the four hours allotted to it. Many of the agencies in attendance also expressed concern regarding the completeness and organization of the memos that were presented. Because of the incompleteness and poor organization of last year’s reporting and lack of time, we never actually got to the point during the annual meeting of discussing the adequacy of the plans or if modifications may be needed.

Since that time OHA has done an extensive review of the plans to develop a comprehensive matrix of annual reporting requirements and their degree of completion for 2008. After reviewing the memos and reports, in cooperation with Kinross, OHA finds the 2008 annual reporting incomplete and lacking basic foundational data needed to analyze the mine’s impacts or the accuracy of model predictions. OHA’s analysis shows that the reporting does not meet the requirements of the plans.

Some Highlights from OHA’s Independent Review

OHA presented a series of graphs and maps showing location of increasing levels from baseline of nitrate, sulfate, ammonia, and chloride.

Annual Reporting Requirements:

  • Hydrologic Monitoring Plan (HMP) – No annual reports received
  • Adaptive Management Plan (AMP) – Memos not integrated (hard to discern if requirements are met), memos are not reports
  • Ecological and Aquatic Resources Management Plan – Annual reporting incomplete

Baseline (Conditions that existed before construction and mining):

  • Baseline water quality values are different for Kinross and Ecology
  • Some baseline values are higher than current concentrations
  • Baseline should be reevaluated so changes from baseline water quality conditions are apparent

Analytical Issues:

  • Detection limits
    • Some numeric values not in database
    • Some metals detection limits are too high compared to baseline/standard
    • Required detection limits are not noted in permit
  • Dissolved vs. total measurements

Missing Analysis:

  • On-site precipitation data
  • Continuous flow inflow/effluent data
  • Surface water monitoring points
  • SW-15: flow and water quality
  • According to HMP, flow should be measured, but no frequency was set. Data are available from Kinross but not in monthly monitoring database.
  • Groundwater – Depth to water at Infiltration Gallery should be reported as depth below ground surface (permit condition) rather than below casing.

Mine Inflow Water Quality: Measured vs. Predicted

Southwest Zone: higher than predicted sulfate, aluminum, arsenic, fluoride, lead, manganese, nitrate, and zinc–Makes treatment more difficult than expected

Flow Evaluations:

  • Myers Creek Augmentation Study
    • The objective of the work was to see if augmentation of the stream with Lost Creek well water would increase flow at the international border (SW-15)
    • Flow at SW-15 was not monitored during the test
    • The augmentation study occurred just after a major storm, making results difficult to interpret
    • Study should be repeated under better weather conditions, and flow should be measured at SW-15
  • Adaptive management
    • Measured vs. predicted flows
    • Locations recommended for additional flow

OHA’s Review Identifies Shortcomings

OHA’s analysis after almost one year of operations was hindered by incomplete annual monitoring and reporting of data. The monthly monitoring of surface and ground water around the mine shows that specific constituents continue to rise above baseline although they remain below standards. We consider the lack of annual monitoring reports specific to each requirement of the Hydrologic Monitoring Plan a potential permit violation. OHA acknowledges that some of the required information may be included in the Adaptive Management Plan memos but, we do not believe this meets the permit requirements. Kinross has expressed a commitment to get it right.

Possible Violations:

  • No on-site meteorological data as required
  • No reporting of flow data for SW-15 (Myers Creek at international border)
  • Outfall 002 is discharging from pipe to rubble, not to stormwater pond as required
  • Inflow/effluent – continuous flow data required but not reported

Measured vs. Predicted Flow Issues:

  • Measured low flows (fall/winter) are often substantially lower than modeled baseflows
  • FEFLOW model does not adequately simulate pre-mining conditions
  • Need precipitation data from the mine and historic stream flows as input to model

Other Issues:

  • Failure to complete conservation easements for mitigation properties
  • Failure to submit annual reports in a timely fashion
  • Failure to make a good faith effort to administer monitoring plan
  • Many surface water points monitored only from June-Sept
  • Some required data in AMP reports; no HMP reports
  • Water use data statistics and photos missing
  • Stream flow data missing
  • Evaluation of predictions in groundwater flow model not adequate
  • Reporting of additional monitoring (NPDES S3.D)
  • Water level or flow are required by the HMP and implementation of HMP is required as a conditions of the NPDES – then flow should be required as part of the NPDES permit


  • Fix weather station at Buckhorn Mountain
  • Re-evaluate modeled baseflow with data from Buckhorn Mountain weather station and historic data
  • Monitor and report flow at SW-4, SW-12, SW-13, SW-15
  • Re-do Myers Creek augmentation evaluation with monitoring point at SW-15
  • Re-evaluate baseline water quality for surface water and groundwater
  • Analytical issues
  • Detection limits
  • Dissolved and total metals for surface water
  • Continue to improve treatment to better remove sulfate, nitrate/ammonia, chloride; consider using less explosive
  • DMRs and composite database should include flow monitoring and OHA settlement monitoring
  • “Frozen” monitoring points should be photo-documented
  • Provide water use data
  • Need integrated annual reporting
  • Mine site (groundwater, surface water, influent/effluent, dewatering wells)
  • “Mitigations” (compensation projects)
  • The next annual meeting should be a full day long and reporting submitted when due

Locations for Additional Flow: Adaptive Management

  • Monitor and report flow at SW-4 (Lower Gold Creek), SW-12 (Lower North Bolster Creek), or SW-13 (Lower South Bolster Creek) – not currently required
  • Flow monitoring is required at upstream locations on Gold Creek (SW-10), North Bolster Creek (SW-11), and South Bolster Creek (SW-14)
  • Depletions are predicted for SW-4, SW-12, and SW-13
  • Monitoring at downstream locations provides better picture of dewatering effects
  • Monitor and report flow at SW-15 (Myers Creek at international border)

Overall OHA expressed concern that predictions of operational and post-closure water quality were too optimistic, due in large part to underestimation of contaminant concentrations from geochemical testing results. The amount of rock predicted to become acidic over short and longer time frames were also underestimated, and plans for management and identification of acid-generating rock poorly defined. (See page 5 of Buckhorn Bulletin, March 2008)

  • The geochemical tests used to define potentially acid-generating (PAG) rock will underestimate the acid-generation potential of rocks in the development rock stockpile and in the underground mine.
  • The short test length and high detection limits for metals renders most of the humidity cell test results almost useless as indicators of water quality.
  • The prediction that development rock will not become acidic in the time that it is exposed during mining is not supported by the mineralogic information or the HCT data.
  • Predictions of operational and post-closure water quality underestimate the ability of the mined materials to generate acid and leach contaminants because they rely upon a series of assumptions and analytical and modeling approaches that underestimate the reactivity of mined materials.
  • Predictions of mitigated post-closure mine water quality does not consider the presence of reactive mine wall rock and underestimate the exceedences of groundwater standards in the underground mine
  • The use of “passivation” techniques is experimental, requires a high degree of engineering success, and is highly unlikely to prevent groundwater exceedences in the underground mine under post-closure conditions.
  • The quantitation limit (QL) for effluent parameters is not defined in the NPDES permit. If the QL is not at least three to five times lower than the effluent limit, it will not be possible to distinguish a non-detect value from an exceedence.
  • No specific quality assurance/quality control (QA/QC) criteria are required for sample reporting.
  • No maximum daily limits are set for surface water discharges for a number of important parameters.
  • The effluent limits for several of the contaminants are set higher than drinking water standards.
  • The effluent limits for cadmium and nickel are much higher than the federal Clean Water Act limits using the relevant aquatic life hardness-based criterion values at the hardness value suggested in the permit.
  • Chronic and acute tests should be run when concentrations in the stream are the highest.
  • The discharge of treated effluent to groundwater will cause exceedences of toxics in surface water.
  • In addition to water quantity or flow monitoring, Myers Creek and tributaries should be monitored for water quality changes that may result from discharge of mine pool water under post-closure conditions.

Some general and specific examples of issues related to the 2008 annual reporting requirements are as follows:

  • The annual monitoring reports were poorly organized and difficult to follow. To review any aspect of the Buckhorn Mine annual reports required navigation and cross referencing through multiple plans, reports and memos.
  • NO required Hydrologic Monitor Plan (HMP) report(s) were submitted to the agencies. The plan is very specific as to the method, location, frequency, and reporting period for each aspect of the plan being monitored. While the Adaptive Management Plan (AMP) uses monitoring information to compare and evaluate, the specific requirements of the HMP have a much broader scope, and many of the required elements had not been reported. If Kinross thought that the HMP reporting requirements were contained in the AMP, some attempt should be made to document which specific requirement was being addressed. OHA did extensive cross-referencing and found many missing HMP elements. (See Stratus Consulting, 2009, Annual Reporting Requirements)
  • Much of the required analyses and data were missing. The AMP reporting contains quite a bit of very useful information that has been greatly improved since the annual coordination meeting with the addition of a table of contents for the ten memos that Golder provided when OHA asked for it. However, much of the data analysis and interpretation required annually has not been reported.

For example:

  1. The discharge to the NPDES outfalls was not reported.
  2. The AMP requires comparison of operational data with pre-mining predictions and conditions, but many of the comparisons were not conducted or only partially conducted.
  3. The on-site meteorological station did not function for most of 2008. The failure of Kinross to maintain a functioning weather station on Buckhorn Mountain makes problematic the evaluation of whether water resource impacts are mine or weather related. Kinross made an effort to provide alternative data, but given the very localized weather patterns for the area, meteorological information must be site-specific (i.e. on Buckhorn Mountain) to be representative.

It is not enough to simply say, “We will do better next time.” Ground and surface water predictions need to be reevaluated and improvements need to be made as part of adaptive management for the mine.

Issues by Water Year: 2009

Out of Adversity Comes Opportunity

The 2009 annual coordination meeting to discuss the Buckhorn Mines took place at the Eagle Cliff Grange on the bank of the Kettle River on March 17th. Final monitoring reports were distributed to the agencies and OHA on March 3rd. OHA’s consultant, Ann Maest of Stratus Consulting, presented our review of the documents along with an independent review of the monitoring data. OHA offered recommendations regarding water treatment, streamflow comparison, capture zone, development rock, the Kettle River Facility, discharge monitoring reports and composite database as well as the timing of the next annual reports.

The purpose of the annual coordination meeting is to review the hydrogeologic and water quality monitoring of the mine and suggest modifications to plans that will help ensure protection of the environment.

WY 2009 Violations: Arsenic (December, January, April); Total Dissolved Solids (TDS) (May); ammonia (June); zinc (July); chlorine (July)

Cleaner Reports, Cleaner Water… but concerns remain regarding certain missing and faulty data and analysis

This year’s evaluation is based on Water Year (WY) 2009, which began on September 31, 2008 and ended on October, 1, 2009. WY 2009 reports were much improved over last year’s reports. The reports were well organized and for the most part addressed the issues directly, spelling out the requirements early.

Shortly after last year’s annual meeting, numerous violations, orders and a $40,000 fine were issued to Kinross/Crown for various water quality violations and failure to maintain the mine’s capture zone. The violations and orders continued until August when improvements to the Water Treatment Facility were implemented. Since that time no violations have been issued.

Summary Findings
  • Water Treatment Plant improvements and approach were positive – more improvements needed
  • A number of sites are adversely affected by underground mine and/or treated water releases; WY 2010 will show if improved; none of the levels are alarming
  • No large decreases in streamflows, but methods for estimating changes and meteorologic data need improvement
  • Groundwater capture has not been demonstrated – seasonal variability in groundwater levels overwhelms drawdown signal at many of the wells

More information can be found on pages 4-5 of the April 2010 Buckhorn Bulletin Newsletter, with updates, issues, and recommendations regarding:

  • Water Treatment Plant (WTP)
  • Water Quality Issues
  • Development Rock
  • Evaluation of Mine Dewatering Impacts to Streamflow
  • Capture Zone
  • Kettle River Tailings Facility

Draft Modification NPDES Permit

2009 also brought a draft modification NPDES, which involved some serious water quality issues:

On May 14, 2009, Washington State Department of Ecology issued a draft modification NPDES (National Discharge Elimination System) permit and fact sheet.

The purpose of the modification was:

  • To add monitoring for chlorine to the NPDES. Chlorine would be used to reduce unexpectedly high levels ammonia.
  • To add some aspects of OHA’s settlement agreement to the permit such as increasing surface water monitoring during April, May, and June for turbidity and Total Dissolved Solids from monthly to bi-weekly for monitoring sites SW-7, 8, & 9 downstream on the east side of the mine and at three sites on Marias Creek Rd.
  • To add grease and oil monitoring for water in and out of the treatment facility, the lack of which was an oversight from the original permit.
  • To add another round of chronic and acute testing since the first one was not conclusive.

There was no disclosure of the impacts of increased chlorine on aquatic organisms. The public has a right to know the impacts of decisions before they are made. OHA asked that Ecology show that adding chlorine to the environment would be less harmful than other methods of reducing ammonia levels such as biological treatment, artificial wetlands or adding additional zeolites to the treatment facility. OHA also asked that an AKART (All Known and Reasonable Technology) be done.

The engineering report for this NPDES modification was approved in February 2009 and included a modification of the point of discharge of Outfall 002 from the storm water infiltration pond to from a pipe at the top of riprap on the hillside above Gold Bowl Creek. Ecology had wrongly considered this change in discharge point a minor modification since the change has previously caused erosion and slope instability, in violation of permit limits and so not covered under 40CFR122.63. There was no documented justification or cause for not using the stormwater pond to infiltrate discharge of Outfall 002.

The effluent failed the acute toxicity testing if any aquatic test organism has less than 80% survival in 100% effluent. The toxicity tests conducted in September 2008 showed no survival (100% dead) in 100% effluent. Based on these results, additional monitoring should have taken place but did not.

The modification failed to include other provisions of OHA’s settlement monitoring that are west of the mine. According to the settlement agreement water quality monitoring similar to NPDES requirements will be conducted on SW-5, 10, & 11 also. OHA asked that these monitoring points also be included in the modified permit.

Detection limits for a number of toxic metals were too close to, or in some case even higher than, relevant standards. OHA asked that these detection limits be lowered and included in the permit and monitoring reports.

Issues by Water Year: 2010

After more than three years of operation, ongoing issues continue to ebb and flow, such as some significant water quality challenges on Buckhorn that have corrective action in process.

Water Year 2010 Annual Meeting

The annual coordination meeting to discuss Buckhorn Mine’s Water Year 2010 data took place at the Eagle Cliff Grange on the bank of the Kettle River on March 15th. Annual monitoring reports were submitted to the agencies a few weeks prior to the meeting. The purpose of the annual meeting is to review a summary of the previous year’s monitoring data, discuss the adequacy of monitoring plans and recommend any modifications that might be needed. OHA opened the meeting with a presentation of our analysis of the monitoring data, and followed up with a presentation and the independent review by Ann Maest of Stratus Consulting, which laid out our concerns regarding the company’s analysis. OHA also raised concern over contaminated mine leakage and offered suggestions to address the issue.

OHA submitted a memorandum outlining changes to the Adaptive Management Plan we recommend and a list of actions that would improve the environmental reporting and performance of the mine. A separate memo was also submitted regarding Kinross/Crown’s failure to apply the required shotcrete to potentially acid generating (PAG) mine walls.

Kinross began their presentation with an overview of how much they contribute to the community with jobs and donations and how much gold has been produced. Next, they provided an overview of the capture zone issue, the water treatment facility and surface and ground water quality. Prior to the annual reporting, Kinross adamantly maintained that the capture zone was effectively intercepting all mine contaminants. At the annual meeting, Kinross consultant, Golder Associates, presented quite another story. After rerunning the groundwater model, it is clear that four monitoring wells in the North Lookout Fault-3, east of the mine, are outside the capture zone and that it could take years for the contamination to dissipate. Mine contamination has also leaked west of Buckhorn into the surface water of South Bolster Creek.

OHA Recommended That…

Operational Changes should be Documented:

Adaptive management will continue to play a critical role in mining operations. In fact, some of the most important operational changes that have taken place over the past year are not included, or are minimally mentioned, in the annual reporting. For instance, the renovation and upgrade of the treatment facility has greatly improved effluent discharge, thereby reducing downstream impacts; however, it is not discussed in any detail in the annual reports.

Unless the changes that have taken place are documented, future mine staff and regulators will only have a tangential understanding of how and why things are done the way they are done. This is an inadequacy of the Adaptive Management Plan (AMP). OHA recommended that a provision be added for annual reporting to include an explanation of the issues the mine has addressed over the year as well as the proposed or implemented solutions. Kinross and the agencies agreed with OHA that annual reporting will now include major changes that have been implemented at the mine, including an explanation of reasons for instituting the changes.

Faults Should be Mapped:

The network of fractures throughout the mine and underlying the facilities are more extensive than previously understood by mine officials. Contamination from the underground mine, and likely the waste rock/ore stockpile, travels underground through interconnected faults, bypassing the dewatering wells and ending up in ground and surface water down-gradient from the mine. The increase in sulfates could indicate the start of acid mine drainage. Nitrates from blasting have increased to the west, south, and east of the mine.

While the 2010 shotcrete inspection report failed to present the required volume and method of shotcrete application, it did reveal that additional faults exist, which have not been noted in any previous documentation. Understanding the location of new faults is well established as a critical factor in understanding the movement of contaminants.

The Development Rock Management Plan (DRMP) provides procedures for identifying PAG rock to secure safe storage and disposal. Part of that process includes mapping the location from which PAG is mined. OHA suggested that the quarterly reporting of development rock characterization should be modified to include quarterly mapping of PAG locations and mapping of any fault and fractures that are identified while mining. These reports would be summarized annually. This modification was accepted.

OHA also recommended that additional investigations of hydrologic pathways and faults on the mine site should be conducted. Studies could include additional pump tests, with response wells located across known or suspected faults; additional geophysical studies; and additional geochemical studies of water quality in mine sources and at stream and groundwater monitoring points. These suggestions are being considered.

Shotcrete is Needed To Prevent Acid Mine Drainage:

One very important aspect of the DRMP and AMP that is known to be highly effective has unfortunately not been implemented. Shotcrete inspection reporting reveals that only limited amounts of shotcrete were applied for PAG pacification last year and none in the previous year. Shotcrete is supposed to be applied to all PAG headings. For the last three years there have been increasing amounts of PAG rock and a corresponding greater amount of PAG headings. The application of shotcrete is not discretionary; it is a provision of the DRMP and AMP to be implemented because it would reduce the likelihood of Acid Mine Drainage (AMD).

The AMP for Development Rock states, “Shotcrete will be used to prevent air and moisture penetrating into blast fractures in the Damaged Rock Zone (DRZ), thus reducing oxidation and interaction between DRZ PAG rock and mine water. This shotcrete will also reduce oxidation (by limiting airflow) of DRZ PAG rock that remains exposed above the water table after the groundwater system has re-equilibrated. As part of the adaptive management plan, the extent of the shotcrete will be determined based on the mine engineer’s mapping of PAG rock, and water flows into the mine.”

Shotcrete creates a reasonably effective barrier to prevent AMD, whereas backfilled cement does not create an effective barrier. Backfilled cement performs a structural function so that additional mining can take place, but does not necessarily form a seal. As a result, water that infiltrates around and through the backfilled cement rock has a high probability of eventually picking up contaminants and spreading the contaminants into the ground and surface water. Unfortunately, for the past two years, little or no shotcrete has been applied. Kinross says that from now on they will apply shotcrete but they still think that no shotcrete is needed if cemented backfill fills the mine-shafts. This is not acceptable.

At the annual coordination meeting, OHA requested that Ecology require Kinross to go back and shotcrete all mine-shafts that contain PAG rock. Some of the shafts have already been filled with cement. OHA has asked that this cement be removed and shotcrete applied as required. The agencies will consider this request. OHA also requested that in the future, no cemented rock fill is placed until the PAG headings are properly sealed (shotcreted). OHA requested that PAG stockpile discharge monitoring occur monthly, a suggestion that will be implemented, as well as more often during spring runoff, which the company is considering.

Adaptive Management Issues

Kettle River Tailings Facility: There is a trend of increasing concentrations of nitrate, sulfate, and TDS in surface water; this should require Adaptive Management Plan action.

Issues by Water Year: 2011


In May 2011, a large slope failure below the Buckhorn Mine sent a wall of mud and large trees flowing down Gold Bowl Creek. Just below the mine facilities and one of the treated mine water discharge areas, the side hill of Gold Bowl Creek gave way, sending mud cascading thousands of feet, uprooting large trees and scouring the creek drainage of all vegetation 12-15 feet high. Surface water monitoring site SW-9 was obliterated by the May 14, 2011 landslide. A replacement monitoring point was established at SW-9A.

According to Geology (Chernicoff & Whitney, 2002), blasting that accompanies mining, quarrying, and road construction can trigger mass movement. Vibration from these activities can force apart grains of loose sediment, eliminating the friction between them. Sometimes human activity, such as mining, may combine with natural factors to increase the chance of mass movement.

Crown/Kinross consultant Golder Associates performed a dye test to see if treated mine water discharged to the stormwater ponds DA 10/11 was connected to the massive mudslide that blew out the side hill of Gold Bowl Creek in May 2011, uprooting trees and scouring over half a mile of creek. In summary, the results showed that DA 10 contributed to flows in the slide area. OHA does not consider the DA 11 test conclusive because it occurred after the slide area had dried out. There was no flow by the time of the test. Ecology has curtailed treated mine water discharge to these locations.

The National Pollution Discharge Elimination System (NPDES) states, “Discharges must not cause erosion or slope instability.” Crown/Kinross went to great lengths to represent this spring’s mudslide as unrelated to the mining activity. However, as noted above, a connection was established.

As a result of landslides, two of the four treated water discharge points were restricted, and the company sought additional places to discharge treated mine water. Additional environmental review will be necessary to examine the impacts of discharging large quantities of treated water into yet unidentified locations, before the new discharge points can be permitted. It is in everyone’s best interest for new discharge points to be developed; otherwise, water builds up in the mine.

Water Quality Requirements Violated

  • Concentrations of mine-related contaminants have been increasing in surface water and in groundwater since the mine operations began
  • Water infiltrating through the PAG development rock has leached contaminants into Gold Bowl Creek
  • Erosion from treated mine discharge has contributed to slope instability
  • Other unpermitted mine discharge has entered surface water

The increases in nitrate and chloride concentrations in SW-14 made it apparent that a preferential pathway exists between the mine area and upper South Fork Bolster Creek.

The mine has leaked contaminants since it began operations. The mine’s monitoring shows that the mine has failed to maintain a capture zone, which is supposed to keep mine contaminants out of surrounding ground and surface water. Recent water quality violations began with the spring thaw in May 2011, when a major mudslide erupted below one of the treated mine water discharge locations. The landslide released a 20 foot wall of mud, scouring the vegetation and ripping out trees for half a mile down Gold Bowl Creek.

During May and June, water quality in Gold Bowl Creek exceeded standards for nitrates from blasting and sulfates from acid generating rocks. Sulfide rock removed from the mine is stored on the surface, exposed to the elements and can form sulfuric acid. Nitrates from blasting have also been elevated in Bolster Creek, west of Buckhorn, and in groundwater wells east of the mine.

Unfortunately, discharges of pollutants have been occurring from the mine that are not permitted by the NPDES. In fact, the permit specifically states that no other discharges are permitted. However, contaminants from the mine and waste rock pile discharges have increased in ground and surface water, sometimes in excess of Water Quality Standards (WQS), and yet since April 2008, Ecology has not issued violations for failure to maintain the capture zone, nor for discharges from the waste rock pile. Throughout 2011, OHA continued to encourage Ecology to hold the company accountable for these non-permitted discharges.

Reporting Issues

As part of the response to the Department of Ecology’s Administrative Order #8820, Crown/Kinross updated the Groundwater flow model for the Buckhorn Mine. OHA reviewed the Nov. 2011 Golder report entitled, “Updated Groundwater Flow Model and Mine Inflow Estimates,” and provided comments to Ecology. OHA found the report to be lacking coverage of some critical issues, including omission of grouting to minimize groundwater inflow to the mine and a lack of numeric estimates of groundwater inflow to the mine.

Development Rock Reporting Needs Improvement

Water leaching through development (waste) rock piles, especially in the spring, has increased pollutants in ground and surface water. Kinross is required to submit a report to the Department of Ecology each quarter to provide an analysis of the past quarter’s development rock information.

Ecology rejected the 1st quarter report submitted in August and is requiring the company to generate a report based on criteria at that time.

Crown/Kinross made commitments at the March 15, 2011 Annual Meeting regarding reporting of development rock, including mapping faults and applying shotcrete. No information about faults was in the quarterly report, and shotcrete application was limited.

Contaminants travel through faults or other preferential pathways in the underground mine. Faults and voids in the cemented rock fill (CRF) are identified during mining. OHA had asked that these features be identified in the quarterly reporting to help track contaminant transport. OHA also suggested that increased shotcreting would increase groundwater protection. This suggestion comes as a result of failure of the capture zone, uncertainty related to seasonal fluctuations, and the unreliability of the groundwater flow model. OHA is concerned that the large backlog of PAG DRZ in the underground mine and the failures of the capture zone are degrading water quality around the mine.

Cells where rock from the mine is placed for testing to determine if it is ore or waste rock, and if it is PAG.

OHA also recommended that ore headings should be analyzed for acid generating potential and if it is determined to be PAG, the area should be shotcreted before CRF is applied for ground control. Until this point, it appears that ore has not been tested to determine whether it is potentially acid generating (PAG)!

NPDES Permit Up for Renewal

In the midst of these serious issues, the National Pollution Discharge Elimination System (NPDES) permit came up for renewal. An administrative extension was granted. OHA maintained that at the very least, the NPDES renewal should increase reporting during the spring freshet so that discharges from the waste rock can be more thoroughly monitored. In 2011, one downstream well was monitored once a month, which is insufficient both in frequency and scope to ensure that water quality changes during freshet would be noticed. OHA also strongly suggested that any increase in contaminants beyond the background baseline levels should be highlighted and watched for increasing trends, and all water quality violations should be noted.

Issues by Water Year: 2012

2012 brought official recognition of the Water Quality permit violations, which were swiftly appealed by the company.

Buckhorn Mine Violates Water Quality Permit

On July 16, 2012, the Buckhorn Mine was fined $395,000 for water quality violations.

The largest part of Ecology’s July 2012 penalty was issued for failing to capture and treat mine contaminants for 94 days, thereby violating the NPDES permit. According to OHA’s analysis, the capture zone has been violated since July 2008, for a total of more than 1,640 days.

If a capture zone is not maintained, mine water can enter the groundwater system without treatment. Changes in water quality in stations downgradient of the mine indicate that the hydraulic containment system provided by the mine (capture zone) is not fully effective in containing mine water. Water quality monitoring data for South Fork Bolster Creek station SW-14 shows elevated concentrations of nitrite plus nitrate above background values in every sample collected since July 2008, which demonstrates that Crown has failed to maintain a capture zone on the west side of Buckhorn Mountain. The NPDES strictly forbids any discharges other than those that are permitted and there is no permit to discharge pollutants into Bolster Creek.

Nitrates (Nitrite plus Nitrate, mg/l as Nitrogen) at the SW-14 monitoring point in the South Fork of Bolster Creek are significantly above baseline, indicating escape of contaminants outside the capture zone.

Crown Denies Responsibility for Water Problems

The mining company appealed Ecology’s July 2012 penalty for permit violations at the Buckhorn Mine, denying responsibility for causing the Gold Bowl landslide and for failure of the mine’s capture zone. Crown challenged the amount of the penalties as too high.

Despite the thorough documentation of slope stability problems below treated water discharge locations, and water quality problems below the waste rock piles, the company denied responsibility.

The Buckhorn Mine Adaptive Management Plan (AMP) for Water Quality Changes Due to Mining clearly states, “Mitigation elements incorporated into the Buckhorn Mt. Project to protect surface water and groundwater quality include: Containment of mine water within the mine as a result of the capture zone that develops surrounding the underground mine and dewatering wells.”

There is not an exception written into the language of the mine plans allowing for some of the contaminants to escape the capture zone. All contaminated water emanating from the mine should be captured. The monitoring program laid out in the AMP clearly aims “to determine… whether the mine and dewatering wells are creating a capture zone to contain seepage from the mine, development rock and ore stockpiles.” The plan does not call for partial containment of seepage. Based on the AMP, OHA has an expectation that Crown Resources will maintain a separation between contaminants generated from the Buckhorn Mine and the environment; however, contaminants are emanating beyond the footprint of the mine.

Gold Bowl Creek cuts through sediment deposited by landslide, after the May 2011 slide below the mine.

The appeals have since been settled.

2012 In Review – OHA Issues with the Buckhorn Mine

In 2012, OHA’s issues and concerns prompted numerous memos and letters to Crown/Kinross and regulatory agencies. OHA started the year in early January with a memo to Ecology, commenting on Crown’s consultant’s Updated Groundwater Model (Nov. 2011) and Crown’s response to Administrative Order 8820. After a thorough review of the details, OHA concluded that the report does not demonstrate that the revised groundwater flow model is calibrated to site conditions, nor is it capable of simulating mine conditions (such as leakage of mine-related contaminants to area streams). The revised model failed to simulate the effects of high precipitation and recharge in 2011, and the report has not adequately demonstrated that there is an effective capture zone around the mine. A revised report should be prepared that more directly addresses the success of model calibration and how shortcomings of the model can be improved.

OHA wrote letters to and met with Crown, explained our problems with their proposal to discharge treated mine water into Gold Creek, and provided suggestions of analysis that should be done for last year’s annual review. Crown’s response was that if OHA wants this work to be done, we should do it ourselves.

In February 2012, OHA prepared a memo showing that Crown has failed to maintain the capture zone, in violation of the waste discharge permit.

A year ago in March, OHA presented a memo to all the participants of the mine’s annual review meeting, with recommendations of modifications to the Adaptive Management Plan (AMP), based on concerns that the reporting ignores relevant information and fails to provide thoughtful analysis of conditions at the mine. Some of the main points of the memo are:

  1. The Shotcrete Evaluation is incomplete, lacks objectivity, and for consecutive years has failed to include basic DRMP (Development Rock Management Plan) and AMP requirements. OHA recommends that the 2011 shotcrete evaluation be rejected and that an independent third party submit a new evaluation.
  2. Discharge from the PAG stockpile should be monitored and reported for volume/flow and water quality monthly, with the exception of during spring runoff, when it should be monitored daily.
  3. Additional piezometers and monitoring wells should be installed to reliably establish the extent of the capture zone.
  4. An analysis of ground water elevations, precipitation and dewatering rates should be conducted to better predict the need for water treatment and underground storage.
  5. A new evaluation of geochemical predictions, influent quality and outflow quality should be conducted.

In April 2012, OHA provided Ecology with a synopsis of the shotcrete requirements, including recommendations for enforcement. Shotcrete is a fine-grained cement that helps provide a barrier between reactive rock and preferential pathways to groundwater. Many of the requirements have either been ignored or only partially implemented by Crown.

In June 2012, OHA presented numerous memos to Ecology, beginning with input on Crown’s application for NPDES permit renewal, to supplement the discussions and to increase protection of the environment. OHA raised concerns about the Adaptive Management Plan (AMP) being outdated; a new AMP should be created to reflect what has been and is being learned from the actual data, as well as the operational changes that have been or should be made. Ecology requested we present a memo on the subject, the main points of which are outlined below:

  1. Annual reporting of operational changes should be required, including an explanation of each issue that has been addressed and the changes that have been proposed or implemented. Without a record of these changes, implementation of adaptive management cannot be effectively evaluated.
  2. Seeps and Springs: The 2007 AMP addresses impacts of dewatering on the Nine Acre Wetland. Operational changes designed to avoid further landslides have reduced or eliminated two effluent discharge points, leaving most effluent from the mine to be discharged into the Nine Acre Wetland. This AMP should be revised to reflect the current situation.
  3. Mine Dewatering and water supply impacts to streamflow: To provide mitigation of dewatering impacts, this AMP requires monitoring to determine whether the infiltration gallery is functioning properly, where water is returned to the soil. It appears that the “gradual increase of discharge” to the gallery was not adhered to, and in the absence of performance evaluation, its functions were compromised. This objective should be updated.
  4. Water Quality Changes Due to Mining Operations: Various adaptive management strategies have been adopted to mitigate water quality changes at the mine. The AMP should be updated to reflect the current situation, including increased analysis of data, action levels and mitigation strategies. Adaptive management for failure of the capture zone should be considered, including additional monitoring, analysis and remedial actions.
  5. Development Rock Management: The AMP should be updated to reflect the current situation, including increased analysis of data, action levels and mitigation strategies. These updates should consider actual water quality conditions, implementation of shotcrete requirements, and realistic assessment of discharges from PAG stockpiles.
  6. Slope Stability: Current monitoring and adaptive management of slope stability is ineffectual. If there is any doubt regarding this statement, the current monitoring plan should be evaluated in light of the 2011 landslide. The new AMP should provide for evaluation and management of slope stability.

Also in June 2012, OHA provided Ecology with a memo regarding Crown’s mischaracterization of the 002 treated mine water discharge location.

In October 2012, OHA commended Ecology’s regional director for issuing the penalty to Crown for violating their permit and provided additional examples of provisions that have been violated, including failure to notify Ecology when monitoring values exceeded background values.

About the Mining Act of 1872

Following the boom of mineral discoveries in the west such as the California Gold Rush, the General Mining Act of 1872 was passed by President Ulysses S. Grant to promote settlement and natural resource development in the west. Despite outdated terms, such as charging claimants a “mineral patent” to mine land at no more than $5 per acre, this law continues to govern mineral exploration and extraction in the U.S. today.

SEC. 2319. All valuable mineral deposits in lands belonging to the United States, both surveyed and unsurveyed, are hereby declared to be free and open to exploration and purchase… Click here for the full text of the 1872 Mining Act

Articles and Reports about the Mining Act

Recommended Actions for Management Plans

OHA recommends that Ecology require Crown to take the following actions that would help clarify monitoring and closure requirements and lead to the eventual restoration of mine site water quality:

Add monitoring wells to the underground mine: There is currently only one monitoring point in each of the two zones to analyze water quality changes in the Buckhorn underground mine during closure. More monitoring is needed to understand how recirculation is affecting mine water quality, especially in a fractured bedrock setting. Water quality monitoring wells should be added to the more distant portions of the underground mine (not along the preferential pathway) to evaluate the effectiveness of recirculation during closure.

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Recommended Actions for Permit Violations

Effectiveness of measures taken: Ecology should insist that Crown provide the agency with a critical investigation into the effectiveness of each mitigation measure it has implemented as part of the settlement of the July 2012 penalty for water quality violations. This evaluation was required by a July 19, 2016 administrative order but was never produced by the company. Evaluations are necessary to better understand the successes and failures of past actions and to help guide future actions. Ecology must make sure its role as regulator is not undermined by the company ignoring its authority with no consequences.

Communication about Violations: Each month, Crown/Kinross Discharge Monitoring Reports contain numerous violations. OHA recommends that Ecology inform the mining company that the violation(s) can be subject to significant penalties, and that the agency order corrective action. Ecology should administer its regulatory responsibility to ensure that Crown/Kinross follows through on orders and commitments to contain mine contaminants.

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OHA’s Recommendations for Buckhorn Mine Plans

Note: This text still needs to be edited (See Google Drive)

OHA recommends that Ecology require Crown to take the following actions that would help clarify monitoring and closure requirements and lead to the eventual restoration of mine site water quality:

  • Add monitoring wells to the underground mine. One monitoring point to measure changes in two zones of the Buckhorn underground mine during closure is insufficient to understand how recirculation is affecting mine water quality, especially in a fractured bedrock setting. Water quality monitoring wells should be added to the distal portions of the underground mine (not along the preferential pathway) to evaluate the effectiveness of recirculation during closure.
  • Modify the HCP. A modified HCP should include the issues discussed in Ecology’s approval letter, especially a requirement to have all monitoring locations on the site meet applicable permit limits for five freshets after recirculation, dewatering, and treatment have stopped. During this time, the treatment plant, dewatering, and recirculation should be able to be restarted if permit limits are not met. The HCP should clarify that all monitoring locations on the site should meet permit limits by the end of closure, including those inside the capture zone.
  • Require a closure AMP. A separate closure AMP should be required to address changes in water quality, stream flows, and groundwater elevations during closure and post-closure. The closure AMP should include monitoring locations and criteria, trigger levels, mitigation measures to be taken, responsibilities, and evaluation of mitigation effectiveness. The closure AMP should also include contingencies that expand the time period and potentially restart water treatment if water quality degrades during the five-year period of the closure phase after treatment has ceased and during the ten-year period of post closure phase. The trigger for adaptive management action should be a comparison to permit limits rather than historical concentrations or trends. Finally, Ecology should require that all water on the site, including areas inside the former capture zone, meets NPDES permit limits at the end of closure.
  • Require a closure HMP. A Hydrologic Monitoring Plan is needed for closure. Currently none exists. The closure HMP should include descriptions of hydrologic and water quality monitoring, including parameters, frequency, and locations, during closure and post-closure periods. A decrease in frequency between Phases 1 and 2 of closure is not warranted.
  • Require a map showing underground workings, wells, and flow directions during closure: Ecology should require Crown/Kinross to create a 3D representation showing the location of the recirculation inflow pipe and outflow well, the sampling location for the Gold Bowl sump, and the remainder of the Gold Bowl workings. The location of the inflow pipe and outflow well for the Southwest Zone and the location of the Southwest Zone sump should also be depicted in a 3D graphic. Expected flow directions in the underground mine with and without pumping should also be included. And add hydrologic plug.
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