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United States
Mason Project

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 Location:
7 km W from Yerington, Nevada, United States

  Project Contacts:
5B Hwy 95A East
Yerington
Nevada, United States
89447
Phone  ...  Subscription required
Fax775-463-4468
EmailEmail
WebsiteWeb
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Overview

StagePreliminary Economic Assessment
Mine TypeOpen Pit
Commodities
  • Copper
  • Molybdenum
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Mine Life27 years (as of Jan 1, 2021)


Owners

Source: p. 7
CompanyInterestOwnership
Hudbay Minerals Inc. 100 % Indirect
Hudbay Arizona Inc. 100 % Indirect
Hudbay Minerals Inc., through its subsidiaries, 100% indirectly owns Mason project.
Hudbay Arizona Inc., through its subsidiaries, indirectly owns 100% of Mason Resources (US) Inc.
Mason US owns a 100% interest in the Mason project in Nevada.

Contractors

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Deposit Type

  • Porphyry
  • Vein / narrow vein


Summary:

Ann Mason is hosted by several phases of the Jurassic-age Yerington batholith, and younger quartz monzonite porphyry dykes (Jqmp-a, Jqmp-b and Jqmp-c). Copper mineralization primarily occurs within a broad zone of main-stage potassic alteration containing chalcopyrite and bornite. An assemblage of chalcopyrite-epidote or chalcopyrite-epidotequartz mineralization locally overprints main-stage potassic alteration and copper mineralization.

Within the Yerington district, Tertiary volcanic rocks, Mesozoic host rocks and coppermolybdenum porphyry deposits have been rotated 60 degrees to 90 degrees westward by Miocene normal faulting and extension. As a result, mineralized intercepts in vertical drill holes through Ann Mason represent approximately horizontal intervals across the original pre-tilt geometry of the deposit.

The Ann Mason deposit has the characteristics of a typical, large copper-molybdenum porphyry system. Projected to the surface, the 0.15% Cu envelope covers an area approximately 2.8 km northwest and up to 1.3 km northeast. At depth, this envelope extends more than a kilometre below surface. The mineralization remains open in most directions.

Within the 0.15% Cu envelope the highest grades occur within a 200 m to 800 m thick, westplunging zone that surrounds the intrusive contact between granodiorite (Jgd) and porphyritic quartz monzonite (Jpqm). Within this zone, copper grade is dependent on vein density, sulphide species, frequenc ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Mason deposit is a large tonnage, copper-molybdenum deposit and is planned to be a traditional open pit shovel/truck operation with a copper sulphide mineral processing plant producing commercial grade copper and molybdenum concentrate.

Mining operations in the pit are designed to be performed from 15 and 30-metre-high benches using large-scale mining equipment including 10 5/8-inch diameter rotary blast hole drills, 74 cubic-yard electric mining shovels, a 55 cubic-yard hydraulic shovel, a 37 cubic-yard front-end loader and 290-tonne capacity haul trucks. During the 27-year operation, the mine plan achieves peak mining rates until year 13, then reduces by about half of the original mining rate from year 14 to 20 as the strip ratio drops. The remaining seven years assumes the processing of rehandled ore from stockpiles.


Crushing and Grinding
Source: Subscription required

- subscription is required.


Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Projected Production:

CommodityProductUnitsAvg. AnnualLOM
Copper Payable metal kt 2,926
Copper Metal in copper conc. kt 3,033
Copper Concentrate kt 11210,108
Molybdenum Payable metal kt  ......  Subscription required
Molybdenum Metal in concentrate kt  ......  Subscription required
Molybdenum Concentrate kt  ......  Subscription required
Gold Payable metal koz  ......  Subscription required
Gold Metal in copper conc. koz  ......  Subscription required
Silver Payable metal koz  ......  Subscription required
Silver Metal in copper conc. koz  ......  Subscription required

Operational Metrics:

Metrics
Daily milling rate  ......  Subscription required
Stripping / waste ratio  ......  Subscription required
Daily ore mining rate  ......  Subscription required
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Total tonnes mined, LOM  ......  Subscription required
Tonnes milled, LOM  ......  Subscription required
Daily processing capacity  ......  Subscription required
* According to 2021 study.
Subscription required - Subscription is required.

Reserves at January 1, 2021:
Mason mineral resources are estimated using a minimum NSR cut-off of $6.25 per tonne

CategoryTonnage CommodityGrade
Measured 1,417,000,000 t Copper 0.29 %
Measured 1,417,000,000 t Molybdenum 59 g/t
Measured 1,417,000,000 t Gold 0.031 g/t
Measured 1,417,000,000 t Silver 0.66 g/t
Indicated 801,000,000 t Copper 0.3 %
Indicated 801,000,000 t Molybdenum 80 g/t
Indicated 801,000,000 t Gold 0.025 g/t
Indicated 801,000,000 t Silver 0.57 g/t
Measured & Indicated 2,219,000,000 t Copper 0.29 %
Measured & Indicated 2,219,000,000 t Molybdenum 67 g/t
Measured & Indicated 2,219,000,000 t Gold 0.029 g/t
Measured & Indicated 2,219,000,000 t Silver 0.63 g/t
Inferred 237,000,000 t Copper 0.24 %
Inferred 237,000,000 t Molybdenum 78 g/t
Inferred 237,000,000 t Gold 0.033 g/t
Inferred 237,000,000 t Silver 0.73 g/t

Commodity Production Costs:

CommodityUnitsAverage
Cash costs Copper USD  ......  Subscription required *†
All-in sustaining costs (AISC) Copper USD  ......  Subscription required *†
Assumed price Molybdenum USD  ......  Subscription required&nbs
Assumed price Copper USD  ......  Subscription required&nbs
Assumed price Silver USD  ......  Subscription required&nbs
Assumed price Gold USD  ......  Subscription required&nbs
* According to 2021 study / presentation.
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units2021
OP mining costs ($/t mined) USD 1.2 *
Processing costs ($/t milled) USD  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2021 study.
Subscription required - Subscription is required.

2021 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 5,506
Freight costs $M USD 1,320
G&A costs $M USD 1,272
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
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.


Proposed Heavy Mobile Equipment as of March 3, 2017:
HME TypeSizeQuantity
Dozer (crawler) 433 kW ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
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Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 3, 2017
....................... Subscription required ....................... Subscription required Subscription required Mar 3, 2017
....................... Subscription required ....................... Subscription required Subscription required Mar 3, 2017
....................... Subscription required ....................... Subscription required Subscription required Nov 10, 2022
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2019
Management Discussion & Analysis 2018
Annual Information Form 2017
Preliminary Economic Assessment 2017
Preliminary Economic Assessment 2015
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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