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Canada
Tulsequah Chief Project

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 Location:
96 km S from Atlin, British Columbia, Canada

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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Filings & News

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Overview

StatusInactive / Suspended
Mine TypeUnderground
Commodities
  • Copper
  • Lead
  • Zinc
  • Gold
  • Silver
Mining Method
  • Cut & Fill
  • Longhole stoping
Processing
  • Gravity separation
  • Flotation
Mine Life11 years (as of Jan 1, 2014)


Owners

Source:
CompanyInterestOwnership
Chieftain Metals Inc. 100 % Direct
The Tulsequah Chief mine in northwestern B.C. looks set to languish for years to come, after its owner — Toronto-based Chieftain Metals Corp. — collapsed under a $27 million debt.
It's the second company in less than a decade to attempt to revive the historic mine, and fail.

Deposit Type

  • VMS


Summary:

The Tulsequah Chief and Big Bull deposits are polymetallic volcanogenic massive sulphide (VMS) deposits of bimodal-felsic, island arc or arc related affinity, similar to the Kuroko type deposits found in Japan. These deposits are generally associated with back-arc basins associated with subduction tectonic environments. The deposit consists of several distinct lenses of massive sulphide mineralization that were deposited at or slightly below the sea floor due to precipitation from the venting of metal-rich hydrothermal fluids. These fluids typically exploit fault planes as fluid pathways and create a large zone of hydrothermal alteration in the rocks below the deposits. VMS deposits are characterized by concordant massive to banded sulphide lenses, typically occurring within a distinct stratigraphic interval.


Mining Methods

  • Cut & Fill
  • Longhole stoping


Summary:

The Tulsequah deposit will be accessed via the 120 m (former 5400 level) and 60 m (5200 level) portals. An additional portal will be driven at approximately 84 m level that will act as the SAG mill feed conveyor drift from the mine. The existing 5200 and 5400 levels will be slashed to 5.0 m x 5.0 m to accommodate the trackless equipment fleet. The main mine access will be via the 60 m level and connect to the main ramp that will access the mining levels. The main ramp is 5.0 m x 5.0 m in section and inclined to 17%. The main ramp will access sublevels 30 m apart vertically.

The deposit generally dips at greater than 60° and is variable in thickness from less than 3 m to over 25 m. Several mining blocks are planned to be opened simultaneously throughout the vertical extent of the deposit to give mining flexibility needed for sequencing and early access to higher-grade material. The deposit is favourable to a mix of mining methods with the majority coming from longhole stoping and uppers retreat with minor contributions from cut and fill.


Crushing and Grinding


Processing

  • Gravity separation
  • Flotation

Source: Subscription required

Summary:

The concentrator design includes standard crushing and grinding unit operations, gravity gold recovery and conventional froth flotation to recover mineral concentrates of chalcopyrite/tennantite (copper iron sulphide), sphalerite (zinc iron sulphide) and galena (lead sulphide) from the ground ore.

The concentrates will be transported to designated smelters worldwide for subsequent reduction into copper, zinc, and lead metal. Average mill throughput is planned to be approximately 1,100 dry tonnes per operating day (1,219 dry tonnes per day at 90% utilization). Total annual concentrate production is planned to be approximately 72,000 dry tonnes.

The primary jaw crusher is planned to be located underground which also houses the jaw crusher discharge feeder and related ancillary systems, as well as the drive system for the conveyor belt that transfers crushed ore to the storage bin. The conveyors and mill building are planned to be completely enclosed.

Th ........

Recoveries & Grades:

CommodityParameterAvg. LOM
Copper Recovery Rate, %  ......  Subscription required
Copper Head Grade, % 1.46
Copper Concentrate Grade, %  ......  Subscription required
Lead Recovery Rate, %  ......  Subscription required
Lead Head Grade, % 1.29
Lead Concentrate Grade, %  ......  Subscription required
Zinc Recovery Rate, %  ......  Subscription required
Zinc Head Grade, % 6.95
Zinc Concentrate Grade, %  ......  Subscription required
Gold Head Grade, g/t 2.85
Silver Head Grade, g/t 103.72
Subscription required - Subscription is required.

Projected Production:

CommodityProductUnitsAvg. AnnualLOM
Copper Concentrate t 24,760274,256
Lead Concentrate t  ......  Subscription required  ......  Subscription required
Zinc Concentrate t  ......  Subscription required  ......  Subscription required
Gold Metal in concentrate koz  ......  Subscription required  ......  Subscription required
Silver Metal in concentrate koz  ......  Subscription required  ......  Subscription required

Operational Metrics:

Metrics2014
Daily ore mining rate 1,097 t
Annual mining capacity 400,405 t of ore
Ore tonnes mined, LOM 4.4 Mt
Daily processing rate 1,100 t

Reserves at December 31, 2014:

CategoryTonnage CommodityGrade
Proven 684,000 t Copper 1.48 %
Proven 684,000 t Lead 1.36 %
Proven 684,000 t Zinc 7.84 %
Proven 684,000 t Gold 2.71 g/t
Proven 684,000 t Silver 100.59 g/t
Proven 684,000 t Zinc Equivalent 29.4 %
Probable 3,752,000 t Copper 1.45 %
Probable 3,752,000 t Lead 1.28 %
Probable 3,752,000 t Zinc 6.78 %
Probable 3,752,000 t Gold 2.88 g/t
Probable 3,752,000 t Silver 104.39 g/t
Probable 3,752,000 t Zinc Equivalent 28.9 %
Proven & Probable 4,436,000 t Copper 1.46 %
Proven & Probable 4,436,000 t Lead 1.29 %
Proven & Probable 4,436,000 t Zinc 6.95 %
Proven & Probable 4,436,000 t Gold 2.85 g/t
Proven & Probable 4,436,000 t Silver 103.72 g/t
Proven & Probable 4,436,000 t Zinc Equivalent 29 %
Measured 0.787 Mt Copper 1.57 %
Measured 0.787 Mt Lead 1.5 %
Measured 0.787 Mt Zinc 8.6 %
Measured 0.787 Mt Gold 2.81 g/t
Measured 0.787 Mt Silver 105.5 g/t
Measured 0.787 Mt Zinc Equivalent 30.9 %
Indicated 5.136 Mt Copper 1.43 %
Indicated 5.136 Mt Lead 1.28 %
Indicated 5.136 Mt Zinc 6.76 %
Indicated 5.136 Mt Gold 2.8 g/t
Indicated 5.136 Mt Silver 102.1 g/t
Indicated 5.136 Mt Zinc Equivalent 28.1 %
Measured & Indicated 5.923 Mt Copper 1.45 %
Measured & Indicated 5.923 Mt Lead 1.31 %
Measured & Indicated 5.923 Mt Zinc 7 %
Measured & Indicated 5.923 Mt Gold 2.8 g/t
Measured & Indicated 5.923 Mt Silver 102.5 g/t
Measured & Indicated 5.923 Mt Zinc Equivalent 28.5 %
Inferred 0.439 Mt Copper 0.79 %
Inferred 0.439 Mt Lead 1.03 %
Inferred 0.439 Mt Zinc 5.54 %
Inferred 0.439 Mt Gold 2.33 g/t
Inferred 0.439 Mt Silver 80.6 g/t
Inferred 0.439 Mt Zinc Equivalent 21.6 %

Commodity Production Costs:

CommodityUnitsAverage
Assumed price Lead USD 0.93 / lb *
Assumed price Zinc USD 1.06 / lb *
Assumed price Copper USD 3.08 / lb *
Assumed price Silver USD 17 / oz *
Assumed price Gold USD 1,238 / oz *
* According to 2014 study / presentation.

Operating Costs:

Units2014
UG mining costs ($/t mined) CAD 29.4 *
Processing costs ($/t milled) CAD  ......  Subscription required
Total operating costs ($/t milled) CAD  ......  Subscription required
* According to 2014 study. Incl. Transportation
Subscription required - Subscription is required.

2014 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Pre-Production capital costs $M CAD  ......  Subscription required
Closure costs $M CAD  ......  Subscription required
Total CapEx $M CAD  ......  Subscription required
Total OpEx $M CAD  ......  Subscription required
Total Taxes $M CAD  ......  Subscription required
Net revenue (LOM) $M CAD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M CAD  ......  Subscription required
After-tax Cash Flow (LOM) $M CAD  ......  Subscription required
Pre-tax NPV @ 5% $M CAD  ......  Subscription required
Pre-tax NPV @ 10% $M CAD  ......  Subscription required
Pre-tax NPV @ 8% $M CAD  ......  Subscription required
After-tax NPV @ 5% $M CAD  ......  Subscription required
After-tax NPV @ 10% $M CAD  ......  Subscription required
After-tax NPV @ 8% $M CAD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
Pre-tax payback period, years  ......  Subscription required
After-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.

Proposed Heavy Mobile Equipment as of January 1, 2014:
HME TypeSizeQuantity
Drill 2
....................... Subscription required 1
....................... Subscription required 2
....................... Subscription required ....................... Subscription required 3
....................... Subscription required ....................... Subscription required 1
....................... Subscription required ....................... Subscription required 3
Subscription required - Subscription is required.

Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Technical Report 2014
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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