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United States
Contact Project

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 Location:
132 km NE from Elko, Nevada, United States

  Project Contacts:
2706 – 1011 West Cordova Street
Vancouver
British Columbia, Canada
V6C 0B2
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Overview

StagePre-Feasibility
Mine TypeOpen Pit
Commodities
  • Copper
Mining Method
  • Truck & Shovel / Loader
Processing
  • Sulfuric acid (reagent)
  • Heap leach
  • Solvent Extraction & Electrowinning
Mine Life9.4 years (as of Jan 1, 2016)


Owners

 
CompanyInterestOwnership
CopperBank Resources Corp. 100 % Indirect
Enexco International Inc. 100 % Direct

Deposit Type

  • Porphyry
  • Vein / narrow vein


Summary:

Copper mineralization occurs as an intrusive-related deposit within the Contact batholith and is observed in quartz veins within structural zones and in the surrounding granodiorite. The copper content is highest in the quartz veins, particularly where chalcocite is present, but grades outward into granodiorite where copper minerals occur in quartz veinlets, fracture coatings and disseminations. Mineralization is in the form of tenorite, chrysocolla and cuprite, and lesser chalcocite and covellite. Oxidation is observed to depths of 2,000 feet in drilling.

The model for mineralization at the Project is a porphyry copper system. Although a porphyry copper deposit has not been discovered in the area, the mineralization present is consistent with a porphyry copper model.

Porphyry copper systems involve the shallow emplacement of calc-alkaline multi-phase batholiths. These systems are commonly located in arcs associated with subduction and are also emplaced during extension following an orogeny


Mining Methods

  • Truck & Shovel / Loader


Summary:

Ore production will be by conventional open pit mining methods. The primary mining equipment selected consists of rotary blast hole drills, 19.5 cubic yard hydraulic shovels, and 150 ton haul trucks, supported by track dozers and other ancillary equipment. Drilling will be in 20-foot high benches, double benched with 25-foot wide catch benches on final slopes. Blasting will utilize ammonium nitrate-fuel oil (ANFO) supplemented with emulsion for explosives as most blast holes are expected to be dry. The ore will be hauled by trucks to the crushing area east of the pit, and then conveyed to the heap leach pad south of the pit. Material below the cut-off grade will be hauled by trucks to the waste rock storage facility north of the pit.

The open pit is designed and mined in three phases in order to maximize the grade during the initial years and to balance the required waste stripping over time. Mining in Phase 1 begins at the west end of the ultimate pit, between bench elevations 5,400 feet and 6,200 feet ASL, and progresses eastward to a final pit depth at elevation 4,940 feet ASL. When fully mined, the ultimate pit as planned extends 8,300 feet in length from west to east, and 2,800 feet in width from north to south.

Ore production is planned to vary up to 57,000 tons per day (18.9 million tons per year) in order to maintain a consistent copper production of 50 million pounds per year from the SX-EW plant. Total mine production of ore and waste will reach 226,000 tons per day (83 million tons) in year five. Mining will be on a seven day per week schedule, with two shifts per day.


Crushing and Grinding
Crusher / Mill TypeModelSizePowerQuantity
Gyratory crusher 1
Cone crusher

Summary:

Ore will be reduced to a size of 100%-minus one inch using two-stage crushing operating in open-cycle. Ore from the mine will be hauled to the crushing area, located at the east end of the pit, where it will be dumped into a 300-ton hopper and apron feeder which will feed the primary gyratory crusher. From the primary crusher, the ore will be conveyed to a 40,000 ton coarse ore stockpile and withdrawn to secondary cone crushers and then conveyed to a 40,000 ton fine ore stockpile. From the fine ore stockpile, the ore will then be conveyed to the leach pad using a series of mobile conveyors and a radial stacker which will place the ore on the pad for leaching in 10 to 20-foot lifts. The crushing, conveying and stacking circuit is sized to a capacity of 60,000 tons per day.


Processing

  • Sulfuric acid (reagent)
  • Heap leach
  • Solvent Extraction & Electrowinning

Flow Sheet: Subscription required

Summary:

The Contact Copper Project is designed as an open-pit, heap leach operation. Processing will begin with primary and secondary crushing, followed by stacking the ore on a heap leach pad. Copper will be leached by sulfuric acid solution and processed through a solvent extraction-electrowinning plant (SX-EW) to produce high-purity copper cathodes on site.

Leaching
Crushed ore, once stacked on the leach pad, will be leached with a weak sulfuric acid solution. The leach pad is located on the south side of the open pit on a side slope that drains towards the east and toward the processing plant (Figure 16-3). Solution will be distributed to the pad through piping and emitters at a nominal rate of 0.005 gpm per square foot of surface area, and recovered from the leach pad through a system of drains which direct the solutions to a collection pond at a design rate of 7,000 gpm. Four ponds are required to support the leaching operations:

1. Collection pond containing i ........

Recoveries & Grades:

CommodityParameterAvg. LOM
Copper Recovery Rate, %  ......  Subscription required
Copper Head Grade, % 0.22
Subscription required - Subscription is required.

Projected Production:

CommodityUnitsAvg. AnnualLOM
Copper M lbs 49462
All production numbers are expressed as cathode.

Operational Metrics:

Metrics
Stripping / waste ratio 2.3 *
Daily ore mining rate 41,000 tons *
Waste tonnes, LOM 327,918,932 tons *
Ore tonnes mined, LOM 141,094,003 tons *
Total tonnes mined, LOM 469,012,935 tons *
Annual production capacity 50 M lbs of copper cathode *
Tonnes processed 141,094,003 tons *
* According to 2016 study.

Reserves at March 14, 2016:
Mineral Resource Estimate Reported at 0.07% Cu Cut-off.
Mineral Reserve Estimate Reported at 0.07% Cu Cut-off.

CategoryTonnage CommodityGradeContained Metal
Proven 57,678 k tons Copper 0.23 % 263,249 k lbs
Probable 83,416 k tons Copper 0.21 % 348,499 k lbs
Proven & Probable 141,094 k tons Copper 0.22 % 611,748 k lbs
Measured 75,473 k tons Copper 0.21 % 313,968 k lbs
Indicated 137,640 k tons Copper 0.19 % 517,526 k lbs
Measured & Indicated 213,113 k tons Copper 0.2 % 831,494 k lbs
Inferred 12,982 k tons Copper 0.2 % 52,188 k lbs

Commodity Production Costs:

CommodityUnitsAverage
Cash costs Copper USD 1.72 / lb *
Total cash costs Copper USD 1.73 / lb *
Assumed price Copper USD 3.2 / lb *
* According to 2016 study / presentation.

Operating Costs:

Units2016
OP mining costs ($/ton milled) USD 3.01 *
Processing costs ($/ton milled) USD  ......  Subscription required
Total operating costs ($/ton milled) EUR  ......  Subscription required
* According to 2016 study.
Subscription required - Subscription is required.

2016 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Closure costs $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
OP OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 325.4
G&A costs $M USD 30
Total OpEx $M USD  ......  Subscription required
Royalty payments $M USD  ......  Subscription required
Net revenue (LOM) $M USD  ......  Subscription required
EBITDA (LOM) $M USD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M USD  ......  Subscription required
After-tax Cash Flow (LOM) $M USD  ......  Subscription required
Pre-tax NPV @ 5% $M USD  ......  Subscription required
Pre-tax NPV @ 10% $M USD  ......  Subscription required
Pre-tax NPV @ 8% $M USD  ......  Subscription required
After-tax NPV @ 5% $M USD  ......  Subscription required
After-tax NPV @ 10% $M USD  ......  Subscription required
After-tax NPV @ 8% $M USD  ......  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 March 14, 2016:
HME TypeModelSizeQuantity
Drill ....................... Subscription required 4
....................... Subscription required ....................... Subscription required ....................... Subscription required 1
....................... Subscription required ....................... Subscription required ....................... Subscription required 2
....................... Subscription required ....................... Subscription required ....................... Subscription required 12
Subscription required - Subscription is required.

Mine Management:

Job TitleNameEmailProfileRef. Date
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Oct 23, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
Pre-Feasibility Study Report 2016
Pre-Feasibility Study Report 2013
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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