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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 Life2094


Owners

Source: p. 4
CompanyInterestOwnership
Freeport-McMoRan Inc. 100 % Indirect
Freeport Minerals Corp. (operator) 100 % Direct
Freeport-McMoRan owns 100% of the Sierrita mine through its wholly-owned subsidiary Freeport Minerals Corp.

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 four electric shovels with bucket sizes ranging from 34 to 56 cubic meters, which are capable of moving an average of 200,000 metric tons of material per day.

Sierrita is located in a desert environment with rainfall averaging 14 inches per year. The highest bench elevation is 1,387 meters above sea level and the ultimate pit bottom is expected to be 427 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:

CommodityUnits2022202120202019201820172016
Copper M lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required152160162
Molybdenum M lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Operational Metrics:

Metrics202220212020201920182017
Daily mining capacity  ......  Subscription required  ......  Subscription required175,000 t175,000 t175,000 t175,000 t
Daily milling capacity  ......  Subscription required  ......  Subscription required100,000 t100,000 t100,000 t100,000 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, 2022:
Mineral Reserves Cut-off grade is 0.14% CuEq for Sulphide.
Mineral Resources Cut-off grade is 0.11% CuEq for Sulphide.

CategoryOreTypeTonnage CommodityGradeContained MetalRecoverable Metal
Proven & Probable Stockpiles 650 Mt Copper 0.15 % B lbs 0.2 B lbs
Proven & Probable Sulphide 2,735 Mt Copper 0.22 % B lbs 10.9 B lbs
Proven & Probable Sulphide 2,735 Mt Molybdenum 0.02 % B lbs 1.1 B lbs
Proven & Probable Sulphide 2,735 Mt Gold M oz 0.1 M oz
Proven & Probable Sulphide 2,735 Mt Silver 1.05 g/t M oz 45.5 M oz
Measured Sulphide 496 Mt Copper 0.17 %
Measured Sulphide 496 Mt Molybdenum 0.02 %
Measured Sulphide 496 Mt Silver 0.77 g/t
Indicated Sulphide 1,090 Mt Copper 0.18 %
Indicated Sulphide 1,090 Mt Molybdenum 0.02 %
Indicated Sulphide 1,090 Mt Silver 0.82 g/t
Inferred Sulphide 1,645 Mt Copper 0.17 %
Inferred Sulphide 1,645 Mt Molybdenum 0.02 %
Inferred Sulphide 1,645 Mt Silver 0.81 g/t
Total Resource Sulphide 3,232 Mt Copper 0.17 % 12.4 B lbs
Total Resource Sulphide 3,232 Mt Molybdenum 0.02 % 1.38 B lbs
Total Resource Sulphide 3,232 Mt Gold 0.2 M oz
Total Resource Sulphide 3,232 Mt Silver 0.81 g/t 83.9 M oz



Heavy Mobile Equipment:
HME TypeSizeQuantityRef. Date
Shovel (rope) ....................... Subscription required Dec 31, 2021
Truck (haul) 235 t ....................... Subscription required Dec 31, 2022
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 23, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 31, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 31, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 31, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 31, 2023
....................... Subscription required ....................... Subscription required Subscription required Oct 25, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 31, 2023
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2022
Subscription required 2021
Subscription required 2020
Subscription required 2019
Subscription required 2018
Subscription required 2017
Subscription required 2015

Corporate Filings & Presentations:

DocumentYear
Form 10-K 2022
Other 2022
................................... 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
Other 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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