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United States
Zonia Project

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 Location:
108 km NW from Phoenix, Arizona, United States

  Project Contacts:
2710 – 200 Granville Street
Vancouver
British Columbia, Canada
V6C 1S4
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Overview

StagePreliminary Economic Assessment
Mine TypeOpen Pit
Commodities
  • Copper
Mining Method
  • Truck & Shovel / Loader
Mine Life9 years (as of Jan 1, 2018)
The Zonia Copper Oxide Project in central Arizona has been held under private ownership for almost 100 years and has undergone extensive historical exploration, metallurgical studies and mine development planning. The majority of the mineralized area was pre-stripped during previous open-pit mining operations at Zonia in 1966, as 17 million tons were mined with 7 million tons stacked on heap leach pads, producing cement copper up till 1975.
Latest NewsWorld Copper Updates & Expands Resource Estimate for the Zonia Copper Oxide Deposit, Arizona     February 23, 2023


Owners

Source: p. 5
CompanyInterestOwnership
World Copper Ltd. 100 % Indirect
On January 28, 2022, World Copper Ltd. and Zonia Holidngs Corp. (formerly Cardero Resource Corp.) (“Zonia”) combined their respective businesses pursuant to a plan of arrangement approved by the Zonia Shareholders on December 10, 2021, approved by the Supreme Court of British Columbia on December 14, 2021 and the final acceptance by the TSXV. Cardero amalgamated with 1302172 B.C. Ltd. to become Zonia Holdings Corp., a wholly owned subsidiary of the Company.

Contractors

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Deposit Type

  • Porphyry
  • Metamorphic


Summary:

The Zonia deposit is hosted by steeply dipping, northeast-trending, Precambrian metamorphic rocks of the Yavapai Series, comprising schistose subvolcanic intrusions, volcanic flows and tuffs, and finegrained sedimentary rocks, enclosed in Precambrian granitic plutons. Portions of the area are covered by post-mineralization Quaternary basalt, fanglomerate, and alluvial material. Mineralized units consist mainly of highly variably foliated quartz- monzonite, felsic schist, and diorite, with highly schistose phyllite and chlorite schist along the southeast margin.

The Zonia copper deposit has a north-easterly strike length of about 2,400 m (8,000 ft) and horizontal width varies from 60 m (200 ft) to 460m (1,500 ft). The deposit consists of multiple mineralized zones that dip at various angles to the northwest. The zones are generally in the order of 200 ft (60 m) wide and commonly occur in sub-parallel groups of three or more. Most of the deposit has been drilled to depths of 120 m (400 ft) or less.

The Zonia copper oxide deposit is the highly oxidized portion of a previously supergene-enriched metamorphosed porphyry deposit. Oxidation of the original chalcopyrite mineralization and younger secondary supergene chalcocite has been pervasive and deep, extending down over 250 metres (874 feet) in the central pit at the historical Cuprite mine shaft. Chrysocolla, malachite, azurite, tenorite, and cuprite are the most common copper minerals.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Zonia project would be mined using conventional open pit methods using off-highway trucks and loaders or shovels. Drilling, blasting, load, and haul would be used to remove overburden waste and leachable material. Waste would be hauled to disposal sites located as near as possible outside of the largest hypothetical pit rim. Ground pressure from stacking the waste is not expected to impact pit wall stability.

Leachable material would be hauled from the pit to the crusher. Crushed material would be transported via conveyors to the leach pad.

For the base case, contractor mining operations were selected.

Pit Shell Selection for Design
Each pit was evaluated at cutoff grades varying in 0.01% increments from 0.12% to 0.22% and using preliminary surface mining costs, processing costs, and G&A costs to calculate preliminary Net Present Value (NPV) at varying discount rates and Internal Rate of Return (IRR). This preliminary analysis was conducted to identify the pits with the greatest potential for economic success. The preliminary analysis indicated that the $2.00/lb pit had the greatest potential for economic success.

The pit shell for the $2.00/lb pit was imported into Geovia GEMS™ to design the ultimate pit layout using 45 degrees batter angle, 20-foot bench height, 12.7-foot bench width, 10% ramp grade, and ramp width of 100 feet for all but the lowest four benches, which were given a single-wide 50-foot ramp width.
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Crushing and Grinding
Source: Subscription required

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Processing

Flow Sheet: Subscription required

Summary:

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Projected Production:

CommodityUnitsAvg. AnnualLOM
Copper M lbs 49422
All production numbers are expressed as cathode.

Operational Metrics:

Metrics
Daily milling capacity 30,000 tons *
Daily ore mining rate 30,000 tons *
Waste tonnes, LOM 52.4 M tons *
Ore tonnes mined, LOM 92.6 M tons *
Total tonnes mined, LOM 145 M tons *
Tonnes processed, LOM 92.6 M tons *
* According to 2018 study.

Reserves at December 31, 2017:
Mineral resources - cutoff of 0.2 % total copper.

CategoryTonnage CommodityGradeContained Metal
Measured 15.4 M tons Copper 0.42 % 129.3 M lbs
Indicated 61.4 M tons Copper 0.31 % 380.6 M lbs
Measured & Indicated 76.8 M tons Copper 0.33 % 510 M lbs
Inferred 27.2 M tons Copper 0.28 % 154.6 M lbs

Commodity Production Costs:

CommodityUnitsAverage
Cash costs Copper USD 1.46 / lb *  
All-in costs Copper USD 2.06 / lb *  
Assumed price Copper USD 3 / lb *  
* According to 2018 study / presentation.

2018 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Working capital $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
OP OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 284.7
Refining costs $M USD  ......  Subscription required
Transportation (haulage) costs $M USD 1.7
G&A costs $M USD 29.2
Total OpEx $M USD  ......  Subscription required
Total Taxes $M USD  ......  Subscription required
Gross revenue (LOM) $M USD  ......  Subscription required
Net revenue (LOM) $M USD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M USD  ......  Subscription required
After-tax Cash Flow (LOM) $M USD  ......  Subscription required
After-tax NPV @ 10% $M USD  ......  Subscription required
After-tax NPV @ 8% $M USD  ......  Subscription required
After-tax IRR, %  ......  Subscription required
After-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.

Water Supply

Modeling of the heap operation on a monthly basis over the projected mine life indicates that operation of the heap leach facility (HLF) requires a water supply with an approximate average flowrate of 123 m3 /h (580 gpm). An additional 24 m3 /h (115 gpm) is required for mine, shop, and office water consumption.

Groundwater wells would be developed to meet the project water requirements.


Proposed Heavy Mobile Equipment as of March 22, 2018:
HME TypeModelSizeQuantityLeased or
Contractor
Dozer (crawler) ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNamePhoneProfileRef. Date
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Mar 22, 2018
....................... Subscription required ....................... Subscription required Subscription required Mar 22, 2018
....................... Subscription required ....................... Subscription required Subscription required Jan 23, 2023
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2018

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2023
Corporate Presentation 2023
Management Discussion & Analysis 2022
Preliminary Economic Assessment 2018
Press Release 2018
Press Release 2018
Subscription required - Subscription is required.

News:

NewsDate
World Copper Updates & Expands Resource Estimate for the Zonia Copper Oxide Deposit, Arizona February 23, 2023

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