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United States
Bald Mountain Mine

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 Location:
100 km NW from Ely, Nevada, United States

  Address:
State Route 892
Ely
Nevada, United States
89301
Phone(775)237-5854
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Production Start1981
Mine Life2023
The largest mine site by area in the U.S.
Latest NewsKinross reports 2022 fourth-quarter and full-year results     February 15, 2023


Owners

Source: p. 61
CompanyInterestOwnership
Kinross Gold Corp. 100 % Indirect
KG Mining (Bald Mountain) Inc. (operator) 100 % Direct
The Bald Mountain mine is owned and operated by Kinross’ wholly-owned subsidiary KG Mining (Bald Mountain) Inc. (“KGBMI”).

Contractors



Deposit Type

  • Sediment-hosted

Source: Source p.7-8

Summary:

The project area is located approximately 65 miles northwest of Ely, Nevada, in an area of uplifted Paleozoic through Tertiary rocks. The area is part of a corridor of northwest-southeast directed Tertiary extension in the Basin and Range province of Nevada. The study area is characterized by two north-trending uplifted blocks, the Bald Mountain-Buck Mountain Ridge on the west and Alligator Ridge on the east, separated by a fault valley that encompasses Mooney Basin, the Alligator Ridge deposits, and the Yankee and Vantage deposits.

The Bald Mountain Mining District falls along the southeastern extension of the Carlin trend (Nutt et al.2000). The district contains two separate but adjacent mineral trends: 1) the northwest-southeast Bida trend that parallels the Carlin trend; and 2) the Yankee-Alligator Ridge-Mooney Basin trend that follows the north-northeast trend of the structural basin between the Bald Mountain-Buck Mountain Ridge and Alligator Ridge. The geology of the district is quite complex and consists of a variety of reactivated folds and faults that serve to localize the gold deposits.

The Bida trend is a northwest-southeast structural trend that encompasses the Bald Mountain stock and gold deposits associated with the intrusion of this Jurassic quartz monzonite stock (Nutt et al. 2000). The gold deposits are disseminated along high-angle structures in the Jurassic stock and in the adjacent Cambrian and Ordovician sedimentary rocks. Gold is associated with pyrite, arsenopyrite, marcasite, and argillic alteration. Mineralized limestones have garnet-epidote skarns with associated tungsten, molybdenum, and zinc (Nutt et al. 2000). The deposits were formed at a depth of 3 to 6 km from magmatic fluids associated with the intrusion of the Bald Mountain stock during the Jurassic. The RBM deposit is a higher level deposit in Mississippian clastic sedimentary rocks. Productive ore zones are found at the contact between the Eldorado Limestone-Geddes Limestone and the Secret Canyon Shale, along the contact between the Hamburg Limestone and the Dunderberg Shale, and in the upper part of the Pogonip Group. Uplift of the Bald Mountain area during the Tertiary exposed these gold deposits to erosion and set the stage for discovery and development of gold resources within the Bald Mountain Mining District.

The Mooney Basin-Alligator Ridge-Yankee trend consists of gold deposits that are typical of Carlin-type gold deposits and consist of disseminated gold associated with jasperoid, decalcification, sericite, and clay alteration. Gold is found with pyrite, sphalerite, arsenopyrite, marcasite, realgar, orpiment, stibnite, and barite. The deposits are often associated with reactivated Mesozoic faults and fractures, are localized along the edges of folds, and are stratabound in the Pilot Shale in a zone 100 to 200 feet in thickness (Nutt et al. 2000). Most deposits are associated with jasperoid in the underlying Guilmette Formation. These deposits are Eocene-Oligocene (Tertiary) in age and formed in a shallow, epithermal hot spring environment (Nutt et al. 2000) along a Basin and Range structural basin. Thus, these deposits are considerably younger than the gold deposits with the BMM area.


Mining Methods

  • Truck & Shovel / Loader

Source:

Summary:

The Bald Mountain operation is an open pit mining operation with production from a number of different pits. The three main deposits (Top, Saga and Vantage) represent approximately 74% of the known reserves. Bald Mountain includes several other deposits scattered over the property, and three ROM heap leach pads (Bald Mountain, Mooney and Vantage).


Crushing and Grinding


Processing

  • ROM/dump leach
  • Carbon in column (CIC)
  • Carbon adsorption
  • Cyanide (reagent)

Source: Source

Summary:

Bald Mountain recovers gold using multiple ROM heap leach pads. Gold is extracted from the ore with a cyanide solution and collected on activated carbon in CIC plants. Loaded carbon is shipped off-site for further processing and ultimate gold refining. The mining recovery is high because the ore blocks are large compared to the selective mining unit, and close to all of the material outlined as ore in the grade control process is mined. Selectivity of the ore mining is minimal due to the low cut-off grade and the fact that the grade control outlines large blocks of ore-grade material for mining. Whenever possible, ore blocks are oriented square to the dig direction – minimizing ore loss and dilution.

The heap leach operations are divided into three areas: Bald, Mooney (North, South and Deep South), and Vantage. Vantage is the newest of the areas and became operational during the recertification period. The carbon-in-column (CIC) processing plants include: Process Plant 2, Mooney North Plant, Mooney South Plant, and the Vantage Plant. The Vantage Plant utilizes an innovative vertical CIC process. All operations noted here are within the North Operations Area (NOA) except for the Vantage Complex which is in the South Operations Area (SOA).

The Bald Mountain Mine Area includes:
• Process Area #1 which is no longer in operation. This consisted of a leach pad, five process ponds and a process building. The facilities have been decommissioned and the ponds backfilled. The area is currently under reclamation.
• Process Area #2 includes leach pads (Bald Leach Pad (previously pads 2 through 4) and Leach Pad 5), Pregnant Sump (PS1), Overflow Pond (POF1) and Secondary Pond (P4), two pregnant solution ponds (P5 and P6), Barren Pond (P7), Carbon-in-Column (CIC) process plant and cyanide offloading facility. However, the leach pads are not being actively leached; cyanide has not been added to the leach pads in over 12 months. The leach pads continue to drain down and the CIC process is still operational.

The Mooney Basin Area includes three process areas:
• North Area Facility, comprising a leach pad (Original Pad and Expansion Pads I, II, and III), two process solution ponds, a storm/event pond, Carbon-in-Column (CIC) process plant and cyanide off-loading facility;
• South Area Facility, comprising Leach Pad 4, a process solution pond, a storm/event pond, a solution collection tank, CIC plant and cyanide off-loading facility.
• Deep South Area Facility, comprising Leach Pads 5 and 6, a process solution pond, one storm/event pond, and a solution collection tank. Pregnant solution from this facility is piped to the South Area CIC plant for processing.

Originally, the Mooney North and Mooney South Area facilities operated independently. Pregnant and barren solution lines were constructed that connected these facilities, allowing solution to be pumped between them as needed.

The construction of the Vantage Complex began in Quarter 1 2018. The Vantage Complex is in the South Operations Area, was commissioned in 2019, and consists of:
• A leach pad, a solution collection tank, a process solution pond, a storm/event pond, CIC process plant, two cyanide storage tanks, and a cyanide off-loading area.

Recoveries & Grades:

CommodityParameter202120202019201820172016
Gold Equivalent Head Grade, g/t 0.510.510.420.430.80.64

Production:

CommodityUnits202120202019201820172016
Gold Equivalent oz 204,890191,282187,961284,646282,715130,144
Gold koz

Operational Metrics:

Metrics202120202019201820172016
Ore tonnes mined 19,063 kt18,303 kt15,806 kt24,477 kt21,615 kt10,656 kt
Tonnes processed 19,063 kt18,303 kt16,475 kt23,654 kt21,615 kt10,656 kt
Stripping / waste ratio 2.8
Daily mining capacity 260 kt

Reserves at December 31, 2021:
Mineral reserves Cutoff Grade 0.14 to 0.16 g/t Au.

CategoryTonnage CommodityGradeContained Metal
Probable 40,980 kt Gold 0.6 g/t 798 koz
Measured 9,150 kt Gold 0.8 g/t 233 koz
Indicated 191,375 kt Gold 0.5 g/t 3,359 koz
Measured & Indicated 200,525 kt Gold 0.6 g/t 3,592 koz
Inferred 45,716 kt Gold 0.5 g/t 669 koz

Commodity Production Costs:

CommodityUnits202120202019201820172016
Cash costs (sold) Gold Equivalent USD 905 / oz   836 / oz   768 / oz   547 / oz   642 / oz   1,182 / oz  
Cash costs Gold USD 723 / oz  
All-in sustaining costs (AISC) Gold USD 1,692 / oz  

Financials:

Units202120202019201820172016
Capital expenditures M USD 39  103.8  220.7   149.9   90.5   40.5  
Revenue M USD 352.1  330.5  249.2   403.9   331.5   139.6  
Operating Income M USD -174.7  34.6  12.7   110.7   68.5   -37.4  
Gross profit M USD -165.8  46.3  33.1   130.1   79.1   -30.7  



Heavy Mobile Equipment as of June 29, 2016:
Source: Source p.9
HME TypeModelQuantity
Shovel P&H 2800 XPC 2
Shovel Hitachi EX5500 1
Shovel Hitachi EX5600 1
Shovel Hitachi EX3600 1
Truck (haul) Komatsu 830E-AC 23
Truck (haul) Caterpillar 785 9
Truck (haul) Komatsu 830E D/C 5

Mine Management:

Job TitleNameProfileRef. Date
Chief Geologist Michael Olson LinkedIn Apr 6, 2022
Operations Manager Dale Thompson LinkedIn Apr 6, 2022
Process Maintenance Superintendent Mark Wilson LinkedIn Apr 6, 2022
Sr. Production Geologist Eric Herth LinkedIn Apr 6, 2022

Staff:

EmployeesContractorsTotal WorkforceYear
591 194 785 2020
500 2016

Corporate Filings & Presentations:

DocumentYear
Press Release 2023
Management Discussion & Analysis 2022
Annual Information Form 2021
Financial Review 2021
Management Discussion & Analysis 2021
Press Release 2021
Year-end Mineral Reserves 2021
Annual Information Form 2020
Corporate Presentation 2020
Financial Review 2020
Management Discussion & Analysis 2020
Press Release 2020
Press Release 2020
Press Release 2020
Press Release 2020
Sustainability Report 2020
Sustainability Report 2020
Year-end Mineral Reserves 2020
Annual Information Form 2019
Financial Review 2019
Management Discussion & Analysis 2019
Press Release 2019
Year-end Mineral Reserves 2019
Annual Information Form 2018
Financial Review 2018
Management Discussion & Analysis 2018
Press Release 2018
Year-end Mineral Reserves 2018
Annual Information Form 2017
Financial Review 2017
Management Discussion & Analysis 2017
Other 2017
Year-end Mineral Reserves 2017
Annual Information Form 2016
Annual Report 2016
Annual Report 2016
Corporate Presentation 2016
Management Discussion & Analysis 2016
Technical Report 2016
Annual Report 2015
Press Release 2015
Year-end Mineral Reserves 2015
Annual Report 2014
Other 2009

News:

NewsDate
Kinross reports 2022 fourth-quarter and full-year results February 15, 2023

Aerial view:

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