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United States
Sierrita Mine

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 Location:
37 km S from Tucson, Arizona, United States

  Address:
6200 West Duval Mine Road
Green Valley
Arizona, United States
85614
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Copper
  • Molybdenum
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life2085


Owners

Source: p. 4,127
CompanyInterestOwnership
Freeport-McMoRan Inc. 100 % Indirect
Freeport Minerals Corp. (operator) 100 % Direct

Contractors

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Deposit Type

  • Porphyry


Summary:

The Sierrita mine is a porphyry copper deposit that has oxide, secondary sulfide and primary sulfide mineralization. The predominant oxide copper minerals are malachite, azurite and chrysocolla. Chalcocite is the most important secondary copper sulfide mineral, and chalcopyrite and molybdenite are the dominant primary sulfides.


Mining Methods

  • Truck & Shovel / Loader


Summary:

Sierrita mine has been in operation since 1959 and is an open-pit copper and molybdenum mining complex located in Pima County, Arizona, approximately 20 miles southwest of Tucson and 7 miles west of the town of Green Valley and Interstate Highway 19. The site is accessible by a paved highway and by rail.

The available mining fleet consists of twenty-four 235-metric-ton haul trucks loaded by three electric shovels with bucket sizes ranging from 34 to 56 cubic meters, which are capable of moving an average of 175,000 metric tons of material per day.

The highest bench elevation is 1,300 meters above sea level and the ultimate pit bottom is expected to be 410 meters above sea level. The Sierrita operation, including the adjacent Twin Buttes site, encompasses approximately 47,600 acres, comprising 38,700 acres of fee lands including split estate lands and 8,900 acres of unpatented mining claims held on public mineral estate.


Crushing and Grinding


Processing

Source: Subscription required

Summary:

- subscription is required.


Production:

CommodityUnits2021202020192018201720162015
Copper M lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required152160162189
Molybdenum M lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Daily mining capacity  ......  Subscription required  ......  Subscription required175,000 t175,000 t175,000 t200,000 t
Daily milling capacity  ......  Subscription required  ......  Subscription required100,000 t100,000 t100,000 t102,000 t
Annual production capacity  ......  Subscription required  ......  Subscription required50 M lbs of copper cathode50 M lbs of copper cathode50 M lbs of copper cathode50 M lbs of copper cathode
Subscription required - Subscription is required.

Reserves at December 31, 2021:
Mineral Reserves Cut-off grade is 0.17 % CuEq.
Mineral Resources Cut-off grade is 0.12% CuEq.

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven Sulphide 2,241 Mt Copper 0.24 %
Proven Sulphide 2,241 Mt Molybdenum 0.03 %
Proven Sulphide 2,241 Mt Silver 1.25 g/t
Probable Sulphide 189 Mt Copper 0.19 %
Probable Sulphide 189 Mt Molybdenum 0.02 %
Probable Sulphide 189 Mt Silver 0.99 g/t
Proven & Probable Sulphide 2,430 Mt Copper 0.23 % 10.1 B lbs
Proven & Probable Sulphide 2,430 Mt Molybdenum 0.02 % 1.02 B lbs
Proven & Probable Sulphide 2,430 Mt Gold 0.1 M oz
Proven & Probable Sulphide 2,430 Mt Silver 1.23 g/t 47.2 M oz
Measured Sulphide 1,467 Mt Copper 0.18 %
Measured Sulphide 1,467 Mt Molybdenum 0.02 %
Measured Sulphide 1,467 Mt Silver 0.74 g/t
Indicated Sulphide 597 Mt Copper 0.17 %
Indicated Sulphide 597 Mt Molybdenum 0.02 %
Indicated Sulphide 597 Mt Silver 0.79 g/t
Inferred Sulphide 131 Mt Copper 0.16 %
Inferred Sulphide 131 Mt Molybdenum 0.01 %
Inferred Sulphide 131 Mt Silver 0.75 g/t
Total Resource Sulphide 2,195 Mt Copper 0.18 % 8.5 B lbs
Total Resource Sulphide 2,195 Mt Molybdenum 0.02 % 0.96 B lbs
Total Resource Sulphide 2,195 Mt Silver 0.75 g/t 53 M oz



Heavy Mobile Equipment as of December 31, 2021:
HME TypeSizeQuantity
Shovel 56 cu. m ....................... Subscription required
Truck (haul) 235 t ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 16, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 20, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 20, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 20, 2022
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2021
Subscription required 2020
Subscription required 2019
Subscription required 2018
Subscription required 2017
Subscription required 2015

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Fact Sheet 2018
Form 10-K 2018
Form 10-K 2017
Other 2017
Form 10-K 2016
Form 10-K 2015
Other 2015
Form 10-K 2014
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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