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United States
Silver Bell Mine

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 Location:
55 NW from Tucson, Arizona, United States

  Address:
25000 W. Avra Valley Road
Marana
Arizona, United States
85653
Phone  ...  Subscription required
Fax520-682-2347
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Copper
Mining Method
  • Truck & Shovel / Loader
Processing
  • ROM/dump leach
  • Rubblization
  • Solvent Extraction & Electrowinning
Mine Life18 years (as of Jan 1, 2016)


Owners

Source: p. 50,234
CompanyInterestOwnership
Grupo Mexico S.A. de C.V. 100 % Indirect
Silver Bell Mining LLC. (operator) 100 % Direct
The Mining Division of Grupo Mexico, S.A. de C.V. (GMéxico) is controlled by Americas Mining Corporation (AMC) which operates the United States subsidiary - Asarco LLC (Asarco).

Asarco LLC includes the Mission, Ray and Silver Bell Arizona mines.

The Silver Bell mine is operated by Silver Bell Mine, LLC ("SBM") of which AR Silver Bell, Inc. ("AR SB") maintains 100% of its capital stock of which ASARCO, LLC maintains 100% of its capital stock.

Deposit Type

  • Porphyry


Summary:

The Silver Bell district in Arizona provides a good example of various electrical and electromagnetic methods applied to the same porphyry copper deposits. Lowest resistivities in the Silver Bell area corresponded with the quartz monzonite porphyry and with zones of sericitic alteration. Likewise, highest IP responses were associated with sericitic alteration. The low resistivities at Silver Bell are caused by the strongly fractured nature of the porphyry system, particularly in sericitic zones, and its interconnected sulfide veinlets. Sericitic zones are highly conductive because of intense fracturing, abundant pyrite mineralization, and sericitic alteration. The higher resistivities of the potassic zone, on the other hand, reflect silicification, disseminated sulfides (as opposed to sulfides deposited in veinlets), and overall less abundant sulfide and clay minerals. Propylitic zones are less fractured and have much lower total sulfides and, thus, higher resistivities. Resistivity weakly correlates with the leached cap and underlying zones of enrichment.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The mine operates four open-pits (North Silver Bell, El Tiro, West Oxide and East Oxide).


Crushing and Grinding


Processing

  • ROM/dump leach
  • Rubblization
  • Solvent Extraction & Electrowinning

Source: Subscription required

Summary:

All copper in pits will be extracted from the ore utilizing dump leaching. Each month 1,800,000 tons of ore and waste are mined. The four open-pits and other plant facilities are situated on 19,000 acres. Mining affected areas of the facility total 3,900 acres.

Copper-bearing solutions from the dump leach and rubble areas are collected and pumped to the solvent extraction plant where the copper in solution is concentrated over 30 times before being pumped to the tank house. In the tank house, the copper is recovered from solution using the electrowinning process and plated on stainless steel starter sheets as high-purity cathodes.


Production:

CommodityUnits2020201920182017201620152014
Copper kt  ......  Subscription required  ......  Subscription required1919191919
All production numbers are expressed as cathode.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018201720162015
Daily production capacity  ......  Subscription required63 t of copper cathode63 t of copper cathode63 t of copper cathode63 t of copper cathode63 t of copper cathode
Annual production capacity  ......  Subscription required19.1 kt of copper cathode
Tonnes processed  ......  Subscription required10,255 kt10,463 kt
Subscription required - Subscription is required.

Reserves at December 31, 2020:
Cut-off grade 0.100% Cu.

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 76,546 kt Copper 0.305 % 233 kt


Heavy Mobile Equipment:

Mine Management:

Job TitleNameEmailProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 27, 2021
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Oct 27, 2021
....................... Subscription required ....................... Subscription required Subscription required Oct 27, 2021
....................... Subscription required ....................... Subscription required Subscription required Oct 27, 2021
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2020
Subscription required 2019
Subscription required 2018
Subscription required 2017
Subscription required 2016
Subscription required 2015
Subscription required 2014

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2019
Annual Information Form 2018
Annual Information Form 2017
Annual Information Form 2016
Annual Report 2016
Annual Report 2015
Other 2015
Annual Report 2014
Fact Sheet 2014
Other 2010
Other 2008
Subscription required - Subscription is required.

Aerial view:

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