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

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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
WebsiteWeb
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Overview

StagePre-Feasibility
Mine TypeOpen Pit
Commodities
  • Copper
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Processing
  • Flotation
Mine Life20 years (as of Jan 1, 2019)
Latest NewsNevada Copper Engages Leading Mining Contractor Redpath for Ramp Up to Full Commercial Production     January 30, 2020


Owners & OPERATOR

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.

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 copper content and a hanging wall or distal zone consisting of a 100 to 800 ft thick low grade iron but with higher copper content.

Southeast Deposit
The Southeast Deposit, located 2,000 ft southeast of the South Deposit, is a 300 ft wide skarn-IOCG lens of chalcopyrite-magnetite-garnet-actinolite developed within limestones of the Mason Valley Formation. The zone is unique for the Pumpkin Hollow Property due to its elevated magnetite grades (locally up to 75%). The zone of mineralization strikes northeast and dips steeply northwest with a strike length of 1,500 ft. Magnetite-garnet-epidote skarn hosts the mineralization with chalcopyrite increasing toward the footwall marble front. The Southeast Deposit has a 600 ft vertical extent and is fault bounded, above and below, by low-angle normal faults.

Geologic similarities between the Southeast and South Deposits strongly suggest that the Southeast Deposit may be the upper portion of the South Deposit which has been displaced 2,000 ft to the southeast along the lower listric fault.


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


Processing

  • Flotation

Flow Sheet: Subscription required

Summary:

The stand-alone process plant for the Open Pit Project is designed in two phases: Phase I and Phase II. Phase I is designed as a 37,000 stpd throughput concentrator, from run of mine (ROM) crushing through to filtered concentrate and tailings. Phase II expands the capacity to 70,000 stpd, which involves the addition of a coarse ore stockpile and process circuit of milling and flotation through to unfiltered concentrate and filtered tailings. The additional throughput of concentrate in Phase II will be filtered using Phase I’s concentrate thickening and filtration equipment. The single process facility (SPF) and the unit operations therein are designed to produce a marketable concentrate targeted at 25.5% Cu or greater.

Based on historical test work on the North and South Deposits, estimated average copper recovery is 89.5% in the flotation circuit. The estimated gold and silver recoveries were 67.3% and 56.3% respectively, for the ore from both the North and South open pits. ........

Recoveries & Grades:

CommodityParameterAvg. LOM
Copper Recovery Rate, %  ......  Subscription required
Copper Head Grade, % 0.46
Copper Concentrate Grade, %  ......  Subscription required
Gold Recovery Rate, %  ......  Subscription required
Gold Head Grade, oz/ton 0.002
Gold Concentrate Grade, oz/ton  ......  Subscription required
Silver Recovery Rate, %  ......  Subscription required
Silver Head Grade, oz/ton 0.06
Silver Concentrate Grade, oz/ton  ......  Subscription required
Subscription required - 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  ......  Subscription required
Daily mining capacity  ......  Subscription required
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Total tonnes mined, LOM  ......  Subscription required
Daily processing capacity  ......  Subscription required
Tonnes processed, LOM  ......  Subscription required
Annual processing rate  ......  Subscription required
Annual processing capacity  ......  Subscription required
* According to 2019 study.
Subscription required - Subscription is required.

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

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 1 Leased
....................... Subscription required ....................... Subscription required 8 Leased
....................... Subscription required ....................... Subscription required 2 Leased
....................... Subscription required ....................... Subscription required 3 Leased
....................... Subscription required ....................... Subscription required 1 Leased
....................... Subscription required 6 Leased
....................... Subscription required ....................... Subscription required 1 Leased
....................... Subscription required ....................... Subscription required 2 Leased
....................... Subscription required ....................... Subscription required 3 Leased
....................... Subscription required ....................... Subscription required 3 Leased
....................... Subscription required ....................... Subscription required 2 Leased
....................... Subscription required ....................... Subscription required 2 Leased
....................... Subscription required ....................... Subscription required 2 Leased
....................... Subscription required ....................... Subscription required 34 Leased
....................... Subscription required 5 Leased
....................... Subscription required 3 Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 8, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
Subscription required - Subscription is required.

News:

NewsDate
Nevada Copper Engages Leading Mining Contractor Redpath for Ramp Up to Full Commercial Production January 30, 2020
Nevada Copper Identifies Multiple New Copper Targets and Intersects Near-Surface Copper at Pumpkin Hollow; 2019-2020 Exploration Activities Update December 29, 2019

Aerial view:

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