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United States
Pumpkin Hollow OP Project (Pumpkin Hollow UG 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

StagePre-Feasibility
Mine TypeOpen Pit
Commodities
  • Copper
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Mine Life19 years (as of Jan 1, 2019)
Progress Open Pit Project:
-PFS being updated in Q2: larger resource, increased scale, incorporate solar plant and other work completed since 2018, update for input costs and copper market outlook.
- Definitive Feasibility Study is expected to follow.

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

Subscription required - Subscription is required.

Deposit Type

  • Skarn
  • Breccia pipe / Stockwork

Summary:

North Deposit
The North Deposit of mineralization is located 1,500 ft north of the South Deposit and is centered on a subhorizontal, pipe-like, copper- rich, magnetite-poor skarn and skarn breccia body hosted by hornfels of the Gardnerville Formation (Northwest Deposit). The higher grade mineralization in the skarn breccia grades into a zone of lower copper grade mineralization hosted by granodiorite endoskarn and marble (North Deposit).

The combined Deposit has a 3,500 ft strike length, with true widths of 200 to 900 ft, and a down-dip extent of 1,500 ft and remains open in several directions. Retrograde alteration and sulfide deposition in the North Deposit was focused along fractures at angles to bedding and overprints earlier prograde alteration. Retrograde alteration and mineralization along fractures diminishes away from the breccia core. Chalcopyrite tends to be the last sulfide phase deposited.

South Deposit
The South Deposit, the first discovery on the Property, is a skarn-IOCG magnetite-chalcopyrite body closely associated with an intrusive contact of granodiorite into limestones of the Mason Valley Formation. The deposit is roughly tabular, measuring 3,600 ft along strike, 1,800 ft down- dip, trends northeast, and dips steeply to the northwest. The mineralized section, as defined by USS, can be divided into two zones: a footwall or proximal zone consisting of a 400 to over 1,000 ft thick relatively high grade magnetite with low ........

Mining Methods

  • Truck & Shovel / Loader

Summary:

The Open Pit Project is currently designed as a 37,000 stpd operation, expanding in Phase II to a 70,000 stpd operation, The Open Pit Project has two mining areas, the North Pit and the South Pit.

Open pit mining will commence mining with the North Pit, which possesses higher grade followed by the lower grade, South Pit. Four phases were designed for the North Pit and two phases were designed for the South Pit. Ore from the pits will be hauled to a primary crusher, or to the stockpile, located to the west of the pits. Waste will be hauled to the waste rock storage facility (WRSF), which was designed to accommodate waste from both the North Pit and South Pit. Once the North Pit is exhausted, South Pit waste is used to backfill the North Pit.

Crushing and Grinding
Flow Sheet: Source

Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.

Projected Production:

CommodityProductUnitsAvg. AnnualLOM
Copper Concentrate kt 3165,704
Copper Payable metal M lbs 1633,098
Copper Metal in concentrate M lbs 3,207
Gold Payable metal oz  ......  Subscription required
Gold Metal in concentrate oz  ......  Subscription required
Silver Payable metal oz  ......  Subscription required
Silver Metal in concentrate oz  ......  Subscription required

Operational Metrics:

Metrics
Stripping / waste ratio 3.05 *
Daily mining capacity 70,000 tons of ore *
Waste tonnes, LOM 1,174,895 k tons *
Ore tonnes mined, LOM 385,693 k tons *
Total tonnes mined, LOM 1,560,588 k tons *
Daily processing capacity 70,000 tons *
Tonnes processed, LOM 385,693 k tons *
Annual processing rate 20,300 k tons *
Annual processing capacity 25.5 M tons *
* According to 2019 study.

Reserves at January 21, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 106.6 Mt Copper 0.57 % 1,206 M lbs
Proven 106.6 Mt Gold 0.002 oz/t 199 koz
Proven 106.6 Mt Silver 0.063 oz/t 6,722 koz
Probable 279.1 Mt Copper 0.43 % 2,384 M lbs
Probable 279.1 Mt Gold 0.001 oz/t 419 koz
Probable 279.1 Mt Silver 0.052 oz/t 14,544 koz
Proven & Probable 385.7 Mt Copper 0.47 % 3,590 M lbs
Proven & Probable 385.7 Mt Gold 0.002 oz/t 617 koz
Proven & Probable 385.7 Mt Silver 0.055 oz/t 21,266 koz
Measured 134.3 M tons Copper 0.56 % 1,508 M lbs
Measured 134.3 M tons Gold 0.002 oz/t 255 koz
Measured 134.3 M tons Silver 0.064 oz/t 8,593 koz
Indicated 418.6 M tons Copper 0.42 % 3,492 M lbs
Indicated 418.6 M tons Gold 0.001 oz/t 623 koz
Indicated 418.6 M tons Silver 0.051 oz/t 21,185 koz
Measured & Indicated 552.9 M tons Copper 0.45 % 5,000 M lbs
Measured & Indicated 552.9 M tons Gold 0.002 oz/t 879 koz
Measured & Indicated 552.9 M tons Silver 0.054 oz/t 29,778 koz
Inferred 27.5 M tons Copper 0.36 % 197 M lbs
Inferred 27.5 M tons Gold 0.001 oz/t 37 koz
Inferred 27.5 M tons Silver 0.04 oz/t 1,088 koz

Commodity Production Costs:

CommodityUnitsAverage
Credits (by-product) Copper USD  ......  Subscription required&nbs
Site cash costs (produced) Copper USD  ......  Subscription required&nbs
All-in sustaining costs (AISC) Copper Equivalent USD  ......  Subscription required *†
C1 cash costs Copper 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 ($/ton mined) USD 1.42 *
OP mining costs ($/ton milled) USD  ......  Subscription required
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
OP OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 1,946
G&A costs $M USD 164.5
Total OpEx $M USD  ......  Subscription required
Income Taxes $M USD  ......  Subscription required
Gross 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 @ 7.5% $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
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 21, 2019:
HME TypeSizeQuantityLeased or
Contractor
Crane ....................... Subscription required Leased
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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 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 2019
................................... Subscription required 2019
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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