Mount Polley Mining Corporation - Imperial Metals · 14-11-2014 · Mount Polley Mining Corporation an Imperial Metals company ... WEEK OF NOVEMBER 5 – 11, 2014 Water Management

Page 1 of 5 Mount Polley Weekly Post-TSF Breach Update November 5 - 11, 2014

Mount Polley Mining Corporation an Imperial Metals company

Box 12 Likely, BC V0L 1N0 T 250.790.2215 F 250.790.2613

November 14, 2014 Ministry of Environment Mining Operations Environmental Protection 2080 Labieux Rd. Nanaimo, BC V9T 6J9

WEEKLY POST-TSF BREACH REPORT – WEEK OF NOVEMBER 5 – 11, 2014

Water Management and TSF Works

Polley Lake Dewatering

Polley Lake water elevation = 921.75 m

To maintain the lake water level within its natural range, pumping from Polley Lake to Hazeltine Creek continued all week, with the exception of approximately 8:00am on Thursday November 6

th to 4:00pm on Friday November 7

th (to accommodate hydrology

work being completed downstream).

Breaches No breaches of the water management system containing water flow from the Tailings Storage Facility (TSF) occurred this week.

TSF and Water

Management Structures

All works shown in Figure 1 are complete, with the exception of the following projects:

Work to adjust the overflow culverts and increase the capacity of the Central

Collection Sump is in the planning phase.

The buttress lift along the Perimeter Embankment is underway.

The foundation preparation for additional buttressing along the Perimeter

Embankment is 3% complete.

The Perimeter Access Road (referred to as the Breach Haul Road in Figure 1) is

being extended with a narrow and shallow road towards Hazeltine Creek along

the old channel.

All water from TSF water collection systems is currently transferred to Springer Pit via the Central Collection Sump. Water from the Breach Pump is transferred to the Till Borrow Pit to allow settling of suspended solids prior to being transferred to the Central Collection Sump.


Figure 1. Tailings Storage Facility construction works


Sediment and Erosion Control Measures

Silt Curtain The silt curtain attached to the log boom at the mouth of Hazeltine Creek continues to remove sediment from the water column. The curtain is in good condition.

Sediment Control Works

Current sediment and erosion control works underway on lower Hazeltine Creek (below the Ditch Road) include:

Construction of the Upper and Lower Sedimentation Ponds (see Section

5 of the Lower Hazeltine Creek Erosion and Sediment Control Plan [the

Plan]). The Upper Pond is nearly complete. The Lower Pond is

approximately 30% complete.

o The proposed access road between the two sedimentation

ponds is no longer required and will not be constructed.

Approximately 12 to 15 culverts will no longer be required.

Upgrading of access roads (Section 4 of the Plan).

Rehabilitation work is just beginning in the lower 100 m of Edney Creek.

An application to MFLNRO and DFO was submitted and approved this

past week.

Re-grading and landscaping of select areas (Sections 4 and 9 of the

Plan).

Installation and maintenance of silt control measures including silt

fences and straw bales (see Section 5 of the Plan).

Environmental construction monitoring is occurring continuously during all activities. No change in turbidity in the water in Hazeltine Creek has been detected as a result of the construction.

Design work on the sediment and erosion control plan for upper Hazeltine Creek is complete and under review.

Water Quality Monitoring Program

The maps on pages 1 – 8 of Figure 5 (attached) show locations that have been sampled as part of the water quality monitoring program. The following table is a summary of the current water quality monitoring program. HAC-01a was not sampled one day this week due to time constraints. All locations, including time/weather permitting sites, were completed this week except for QUL-66a, which was completed on November 12th. Frequency Area Sample Locations

Daily Quesnel River QUR-1

Hazeltine Creek HAC-01a

Weekly

Quesnel Lake QUL-2a, QUL-18, QUL-21a, QUL-40a, QUL-66, QUL-66a, QUL-112/QUL-112a, QUL-120/QUL-120a, QUL-zoo-8/QUL-zoo-8a

Hazeltine Creek HAD-1 (when pumping), HAC-05

Polley Lake P1, P2, POL-5, POL-6

2x/week Quesnel Lake QUL-79

Time/weather permitting

Quesnel Lake QUL-2, QUL-20, QUL-21, QUL-22, QUL-31a, QUL-87, QUL-119


Environmental Monitoring Results Mount Polley will continue to present interpreted data on the Mount Polley Updates page of the Imperial Metals website. On November 10th, a Summary of Preliminary Results of Soil Quality Impact Assessment was published on the website.

http://www.imperialmetals.com/s/Mt_Polley_Update.asp?ReportID=671041

http://www.imperialmetals.com/i/mt-polley/2014-11-10_MtPolleyPrelimSoilResults.pdf

http://www.imperialmetals.com/i/mt-polley/2014-11-10_MtPolleyPrelimSoilResults.pdf


ATTACHMENTS Drawings:

612717-005-P1 through 612717-005-P8: Current Monitoring Locations (Figure 5)

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Mount PolleyMine

Quesn

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Polley LakeBootjack Lake

Dag Creek

Morehead Creek

Mart Creek

Dow Creek

Cub Creek

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0

-10

POL-3

POL-4

POL-5

POL-1

P1

P2

Surface WaterSampling Locations_̂ Hazeltine Creek_̂ Polley Lake_̂ Quesnel Lake_̂ Other Areas

0 250 500 750 1,000125Meters

Figure 5: Current Monitoring LocationsPage 1 of 8

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1. Original in colour.2. Numerical scale reflects full-size print. Print scalingwill distort this scale, however scale bar will remainaccurate.3. Intended for illustration purposes, accuracy has notbeen verified for construction or navigation purposes.* Note: Shoreline has been modified from the FreshWater Atlas source data in the area of HazeltineCreek Mouth to reflect post-release conditions.

1. Data provided by Mount Polley Mining Corporation2. Data downloaded from Data.Gov.BC.ca Data Distribution Service.3. Orthophoto collected by McElhanney on August 5th, 2014

REFERENCESNOTESLEGEND

CLIENT NAME: PROJECT LOCATION:

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TAILINGSSTORAGE

FACILITY AREA

Polley Lake

HazeltineCreek

Bootjack Creek

Hazelt ineCreek

HAC02

POL-6

HAD-2

HAC03

HAC04HAD-1

HAC05

HAC07

Breach-01

LDA

POL-2


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Fisher Creek

Bilboa CreekBilboa Creek

Quesnel River

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Quesnel River

Quesnel River

Slum Gulch Creek

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QUL-128

QUL-129

QUL-130

QUR-2

QUL-90

QUL-70

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QUL-92

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Cedar Creek

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Gro g an Creek

Fi sher Creek

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QUL-73QUL-69

QUL-95

QUL-100

QUL-101QUL-ST-FFF-1

QUL-105

QUL-81

QUL-111

QUL-122

QUL-123

QUL-124

QUL-107

QUL-108

QUL-109

QUL-104

QUL-126

QUL-127

QUL-130

QUL-77

QUL-38

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QUL-89QUL-90

QUL-60

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QUL-70

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Quesnel Lake

Polley Lake

Boswell Lake

Nina Lake

C edarCreek

Hazelt ine Creek

Cedar Creek

Cedar Creek

Winkley CreekCedar Cre e k

Bootjack Creek

Deerlet C reek

MeadowyCreek

Dag Creek

Raft Creek

Cub Creek

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HAC04

QUL-124

HAD-1

HAC05

QUL-21a

QUL-66a

HAC07

Breach-01

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Hazeltine Creek

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Hazeltine Creek

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QUL-17

QUL-43

Raft Cr Rec Site

QUL-80

QUL-PW-1

QUL-ST-NF-1

QUL-PW-2QUL-23

QUL-24

QUL-25

QUL-26

QUL-28

HAC06

QUL-11

QUL-12

QUL-13

QUL-14

QUL-15

QUL-7

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HAC01A


Silt Curtain/Log Boom


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QUL-6

QUL-74

QUL-75QUL-121

QUL-125

QUL-2a

QUL-1

QUL-2

QUL-3

QUL-4

QUL-113QUL-114

QUL-115QUL-116

QUL-117QUL-118

QUL-82 QUL-37

QUL-96

QUL-102

QUL-103

QUL-88QUL-83 QUL-84 QUL-85QUL-86


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Dillabough Lake

Niquidet Lake

Melissa Lake

Murdock Lakes

Murdock Lakes

Murdock Lakes

Klinne Lake

Annette Lake

Benny Lake

Quesnel Lake

Keno Lake

Jacques Lake

Whiffle Lake

Hen Ingram Lake

Horsefly

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QUL-ST-REF-1

QUL-106

QUL-110QUL-112

QUL-120QUL-1

QUL-30

QUL-31a

QUL-ZOO-8

QUL-132 QUL-119

QUL-40a

QUL-40

QUL-41

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Mount Polley Mining Corporation - Imperial Metals · 14-11-2014 · Mount Polley Mining Corporation an Imperial Metals company ... WEEK OF NOVEMBER 5 – 11, 2014 Water Management

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