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United States
Henderson Mine

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 Location:
72 km W from Denver, Colorado, United States

  Address:
P.O. Box 68
Empire
Colorado, United States
80438
Phone+1-720-942-3452
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Molybdenum
Mining Method
  • Block caving
Production Start1976
Mine Life2038
Henderson is the largest primary producer of molybdenum in the world. Separated by the Continental Divide, the Henderson Mine and Mill are connected by one of the world’s longest conveyor systems, a 10 mile elevated belt that runs underneath the Continental Divide and emerges above ground for the final five miles.


Owners

Source: p. 4
CompanyInterestOwnership
Freeport-McMoRan Inc. 100 % Indirect
Climax Molybdenum Company (operator) 100 % Direct

Contractors

ContractorContractDescriptionRef. DateExpirySource
Xcel Energy Inc. Power supply Henderson operations receive electrical power through long-term contracts with Xcel Energy. Dec 31, 2021


Deposit Type

  • Porphyry

Source: Source

Summary:

The Henderson deposit is composed of two partially overlapping ore bodies beneath the summit of Red Mountain. The ore bodies are entirely within a Tertiary rhyolite porphyry intrusive complex that has intruded the Precambrian Silver Plume granite. The mineralization is relatively continuous in the ore bodies and consists of molybdenite and quartz in random intersecting closely spaced veinlets. The Henderson mine is a porphyry molybdenum deposit with molybdenite as the primary sulfide mineral.


Mining Methods

  • Block caving

Source:

Summary:

The Henderson operation consists of a large block-cave underground mining complex feeding a concentrator with a current capacity of approximately 32,000 metric tons per day. The available underground mining equipment fleet consists of fifteen 9-metric ton load-haul-dump (LHD) units and seven 73-metric ton haul trucks, which deliver ore to a gyratory crusher feeding a series of three overland conveyors to the mill stockpiles.

The Henderson mine is located in a mountainous region with the main access shaft at 3,180 meters above sea level. The main production levels are currently at elevations of 2,200 and 2,350 meters above sea level.

The Henderson mine and mill are connected by a 10-mile conveyor tunnel under the Continental Divide and an additional five-mile surface conveyor.


Crushing and Grinding
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Processing

  • Crush & Screen plant
  • Flotation
  • Dewatering


Summary:

Henderson has the capacity to produce approximately 15 million pounds of molybdenum per year. The majority of the molybdenum concentrate produced is shipped to our Fort Madison, Iowa, processing facility.

The mine and the Mill are connected by a fifteen-mile elevated belt that passes underneath the Continental Divide through an old train tunnel and then above ground to the mill. Molybdenite (the molybdenum containing mineral) is obtained from the ore by crushing, grinding, and flotation.


Production:

CommodityUnits202120202019201820172016
Molybdenum M lbs 121012141210
All production numbers are expressed as metal in concentrate.

Operational Metrics:

Metrics202120202019201820172016
Daily milling capacity 32,000 t32,000 t32,000 t32,000 t32,000 t32,000 t
Annual production capacity 15 M lbs of molybdenum metal in concentrate16 M lbs of molybdenum metal in concentrate18 M lbs of molybdenum metal in concentrate18 M lbs of molybdenum metal in concentrate35 M lbs of molybdenum metal in concentrate35 M lbs of molybdenum metal in concentrate

Reserves at December 31, 2021:
Cut-off grade for Mineral reserves is 0.13% Mo.
Cut-off grade for Mineral resources is 0.10% Mo.

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven Sulphide 37 Mt Molybdenum 0.18 %
Probable Sulphide 17 Mt Molybdenum 0.13 %
Proven & Probable Sulphide 54 Mt Molybdenum 0.16 % 0.17 B lbs
Measured Sulphide 75 Mt Molybdenum 0.15 %
Indicated Sulphide 36 Mt Molybdenum 0.12 %
Total Resource Sulphide 112 Mt Molybdenum 0.14 % 0.35 B lbs


Pipelines
TypeMaterialDiameterLengthDescription


Heavy Mobile Equipment as of December 31, 2021:
Source: Source p.17
HME TypeSizeQuantity
Load-Haul-Dump (LHD) 9 t 15
Truck (haul) 73 t 7

Mine Management:

Job TitleNameProfileRef. Date
Chief Geologist Nyssa Loeppke LinkedIn Apr 18, 2022
Health & Safety Manager Andy Siersma LinkedIn Apr 18, 2022
Mill Manager Aaron Pietsch LinkedIn Apr 18, 2022
Mine Manager Dave Loring LinkedIn Apr 18, 2022
Sr. Mine Engineer Geoff Hilt LinkedIn Apr 18, 2022

Staff:

EmployeesYear
360 2021
383 2020

Corporate Filings & Presentations:

DocumentYear
Form 10-K 2021
Form 10-K 2020
Form 10-K 2019
Form 10-K 2018
Form 10-K 2017
Form 10-K 2016
Form 10-K 2015
Form 10-K 2014
Other 2014

Aerial view:

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