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United States
Pumpkin Hollow UG Project (Pumpkin Hollow OP Project)

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 Location:
11 km SE from Yerington, Nevada, United States

  Project Contacts:
61 E. Pursel Lane
Yerington
Nevada, United States
89447
Phone  ...  Subscription required
Fax(775)-463-4130
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Overview

StageConstruction
Mine TypeUnderground
Commodities
  • Copper
  • Gold
  • Silver
  • Iron
Mining Method
  • Longhole stoping
  • Cemented backfill
  • Paste backfill
Mine Life14 years (as of Jan 1, 2019)
Nevada Copper’s principal objective for 2023 is to have the Underground Mine operating at nameplate milling capacity of 5,000 tons per day by year end with all critical underground infrastructure complete and sufficient advance development to support sustained operations. Underground lateral development of 24,000 feet is planned for 2023 to establish capital headings and stope development ahead of the commencement of stope mining planned in the third quarter of 2023. Mill restart is scheduled for late Q3 2023 at an expected rate of approximately 3,500 tons per day, ramping up to 5,000 tpd by the end of 2023.
Latest NewsNevada Copper Files Financial Statements, MD&A and AIF for the Year Ended December 31, 2022     March 20, 2023


Owners

Source: p. 516
CompanyInterestOwnership
Nevada Copper Inc. (operator) 100 % Direct
Nevada Copper Corp. 100 % Indirect
Nevada Copper Inc. is a subsidiary of Nevada Copper Corp.

Contractors

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Deposit Type

  • Skarn
  • Breccia pipe / Stockwork
  • IOCG


Summary:

East Deposit
The East Deposit, located 7,000 ft east of the North Deposit, measures approximately 2,000 ft by 1,200 ft and consists of flat-lying to gently dipping, bedding-controlled, stacked skarn-IOCG mineralized zones within the limestone of the Mason Valley Formation at depths of 1,400 to 2,200 ft. The East Deposit is defined by drill holes spaced approximately 175 to 250 ft apart.

Higher grade copper occurs mainly in dolomitized limestones and skarn-chalcopyrite-magnetite-pyrite breccias immediately adjacent to diorite or diorite endoskarn. Much of the high magnetite rock that grounds the East Deposit is within diorite endoskarn. A good amount of continuity is evident in the East Deposit with mineralization possibly continuing and thickening to the west. The area between the East Deposit and the North Deposit still requires detailed exploration to accurately determine the lateral extent of each Deposit.

E2 Deposit
The E2 Deposit is a steeply northwest-dipping lens of high grade copper-magnetite skarn-IOCG breccia within the Mason Valley limestone, which lies on the hanging wall of an endoskarn sill. The lens has been explored along approximately 1,200 ft of strike length, is 40 to 120 ft thick, and is locally continuous for at least 1,600 ft down-dip.

The chalcopyrite-magnetite mineralization follows the marble front, similar to the East Deposit. A major east-trending rotational fault appears to exist between the two deposi ........


Mining Methods

  • Longhole stoping
  • Cemented backfill
  • Paste backfill


Summary:

The Underground Project is planned as a 5,000 stpd operation and has one mining area. The Eastern Area is planned to be mined by underground methods, specifically longhole stoping, with predominantly cemented paste fill (CPF) methods.

Access to the mine will be via a vertical shaft. Mining will be performed using the productive mechanized transverse longhole mining method, with CPF in the primary and some secondary stopes, and uncemented paste fill (UPF) or unconsolidated rock fill (URF) of remaining secondary stopes. While waste rock can be hoisted to the surface and disposed of on the waste rock stockpile, this is only planned during initial development, until the surface paste fill plant is commissioned. Once at steady-state production, all waste rock is planned to remain underground to be used as backfill for secondary stopes.

One production/service shaft and three ventilation/emergency egress shafts are included in the mine design. Stopes will be 100 ft high by 50 ft wide for the ES and E2 zones, and 75 ft high by 50 ft wide for the EN zone.

Mining will be carried out using longhole drilling and blasting, with ore and waste material mucked using load-haul-dumps (LHDs), direct to ore passes or to remuck bays situated for optimum materials handling. Ore material will be transported via haul trucks and/or ore passes to the coarse ore bins (COBs) for storage before being hoisted out of the mine. Haul trucks will be used to transport ore mater ........


Crushing and Grinding


Processing

Source: Subscription required

Summary:

- subscription is required.


Projected Production:

CommodityProductUnitsAvg. AnnualLOM
Copper Payable metal M lbs 50671
Copper Metal in concentrate M lbs 699
Gold Payable metal koz  ......  Subscription required  ......  Subscription required
Gold Metal in concentrate koz  ......  Subscription required
Silver Payable metal koz  ......  Subscription required  ......  Subscription required
Silver Metal in concentrate koz  ......  Subscription required

Operational Metrics:

Metrics
Daily mining capacity 5,000 tons of ore *
Ore tonnes mined, LOM 23,909 k tons *
Daily processing capacity 5,000 tons *
Tonnes processed, LOM 23,909 k tons *
* According to 2019 study.

Reserves at January 21, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 7.4 M tons Copper 1.85 %
Proven 7.4 M tons Gold 0.007 oz/ton
Proven 7.4 M tons Silver 0.144 oz/ton
Probable 16.5 M tons Copper 1.47 %
Probable 16.5 M tons Gold 0.006 oz/ton
Probable 16.5 M tons Silver 0.138 oz/ton
Proven & Probable 23.9 M tons Copper 1.59 %
Proven & Probable 23.9 M tons Gold 0.006 oz/ton
Proven & Probable 23.9 M tons Silver 0.139 oz/ton
Measured 12.1 M tons Copper 1.6 % 389 M lbs
Measured 12.1 M tons Gold 0.006 oz/ton 74 koz
Measured 12.1 M tons Silver 0.127 oz/ton 1,541 koz
Measured 12.1 M tons Iron 18.7 % 2.3 Mt
Indicated 41.9 M tons Copper 1.33 % 1,114 M lbs
Indicated 41.9 M tons Gold 0.005 oz/ton 217 koz
Indicated 41.9 M tons Silver 0.112 oz/ton 4,716 koz
Indicated 41.9 M tons Iron 17.6 % 7.4 Mt
Measured & Indicated 54.1 M tons Copper 1.39 % 1,503 M lbs
Measured & Indicated 54.1 M tons Gold 0.005 oz/ton 291 koz
Measured & Indicated 54.1 M tons Silver 0.116 oz/ton 6,257 koz
Measured & Indicated 54.1 M tons Iron 17.8 % 9.6 Mt
Inferred 29.2 M tons Copper 1.09 % 636 M lbs
Inferred 29.2 M tons Gold 0.003 oz/ton 87 koz
Inferred 29.2 M tons Silver 0.064 oz/ton 1,875 koz
Inferred 29.2 M tons Iron 12.8 % 3.7 Mt

Commodity Production Costs:

CommodityUnitsAverage
All-in sustaining costs (AISC) Copper Equivalent USD  ......  Subscription required *†
C1 cash costs Copper Equivalent USD  ......  Subscription required *†
Assumed price Copper USD  ......  Subscription required&nbs
Assumed price Silver USD  ......  Subscription required&nbs
Assumed price Gold USD  ......  Subscription required&nbs
* According to 2019 study / presentation.
† Net of By-Product.

Operating Costs:

Units2019
OP mining costs ($/ton milled) USD 27.2 *
Processing costs ($/ton milled) USD  ......  Subscription required
Total operating costs ($/ton milled) USD  ......  Subscription required
* According to 2019 study.
Subscription required - Subscription is required.

2019 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
UG OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 241
G&A costs $M USD 77
Total OpEx $M USD  ......  Subscription required
Total Taxes $M USD  ......  Subscription required
Royalty payments $M USD  ......  Subscription required
Gross revenue (LOM) $M USD  ......  Subscription required
Net revenue (LOM) $M USD  ......  Subscription required
EBITDA (LOM) $M USD  ......  Subscription required
After-tax Cash Flow (LOM) $M USD  ......  Subscription required
Pre-tax NPV @ 0% $M USD  ......  Subscription required
Pre-tax NPV @ 5% $M USD  ......  Subscription required
Pre-tax NPV @ 7.5% $M USD  ......  Subscription required
After-tax NPV @ 0% $M USD  ......  Subscription required
After-tax NPV @ 5% $M USD  ......  Subscription required
After-tax NPV @ 7.5% $M USD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
After-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.


Proposed Heavy Mobile Equipment as of January 21, 2019:
HME TypeSizeQuantity
ANFO Loader ....................... Subscription required
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Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 8, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 27, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 8, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 8, 2022
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
................................... Subscription required 2021
................................... Subscription required 2019
................................... Subscription required 2019
Press Release 2018
Feasibility Study Report 2015
Subscription required - Subscription is required.

News:

NewsDate
Nevada Copper Files Financial Statements, MD&A and AIF for the Year Ended December 31, 2022 March 20, 2023
Nevada Copper Provides Update on Production Restart at Pumpkin Hollow and Identification of Additional Copper Targets February 13, 2023

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