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United States
Fort Knox Mine (Gilmore expansion Project)

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 Location:
25 km NE from Fairbanks, Alaska, United States

  Address:
PO Box 73726
Fairbanks
Alaska, United States
99707-3726
Phone  ...  Subscription required
Fax(907)-490-2290
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
Processing
  • Gravity separation
  • ROM/dump leach
  • Concentrate leach
  • Carbon in pulp (CIP)
  • Carbon in column (CIC)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life2030


Owners & OPERATOR

Source: p. 61
CompanyInterestOwnership
Kinross Gold Corp. 100 % Indirect
Fairbanks Gold Mining, Inc (operator) 100 % Direct
The Fort Knox mine is owned and operated by Kinross’ wholly-owned subsidiary Fairbanks Gold Mining Inc. (“FGMI”).

Deposit Type

  • Breccia pipe / Stockwork
  • Vein / narrow vein


Summary:

The Fort Knox deposit is hosted entirely within the Fort Knox Pluton, and Au-Bi-Te mineralization is strongly structurally controlled. Drilling has identified mineralization to the -535 ft level. Gold occurs within and along margins of pegmatite veins, quartz veins and veinlets, within shear zones, and along fractures within the granite.

Vein-types and associated alteration styles found at Fort Knox (Bakke et al., 1998) are:

(1) Pegmatite veins and veinlets: range in thickness from micro-scale to 8 cm. Composed of clear to gray quartz, large K-spar megacrysts, and micaceous clots. Potassic alteration halos, rarely exceeding 1 cm thick, consist of an assemblage of variable amounts of secondary biotite and K-spar overgrowths on primary K-spar within the granite matrix.

(2) Pegmatite veins similar to (1) above with alteration envelopes consisting of a variably developed phyllic (sericite-pyrite) assemblage.

(3) Stockwork quartz veins and veinlets: range in thickness from micro-scale to 15 cm. These veins possess thin albitic alteration halos.

(4) Quartz veins and veinlets similar to (3) above with phyllic alteration envelopes that range in thickness from 0.5 to 3 cm.

(5) Low temperature fracture coatings and chalcedonic veins and breccia composed of zeolite-calcite-clay-chalcedony. Pervasive throughout the deposit in the form of fracture coatings and breccia zones. Argillic alteration halos as much as 7 m in width are developed adjacent to the larger chalcedonic breccia zones.


Mining Methods

  • Truck & Shovel / Loader


Summary:

Mining at Fort Knox is by conventional truck-shovel open pit methods with loading and hauling rates of up to 92 Mt/a. Material moved consists of ore and waste mined from the pit plus ore and waste rehandling. Higher grade ore is processed in a CIP mill, typically at a rate of approximately 13.2 Mt/a. Up to 30 Mt/a of lower grade run-of-mine (i.e., uncrushed) ore is processed at a heap leach facility.


Crushing and Grinding


Processing

  • Gravity separation
  • ROM/dump leach
  • Concentrate leach
  • Carbon in pulp (CIP)
  • Carbon in column (CIC)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

Fort Knox operates two ore processing lines: a mill operation consisting of crushing, grinding, agitated cyanide leaching, and a carbon-in-pulp (CIP) circuit; and a run-of mine valley-fill cyanide heap leaching operation where gold is recovered using two parallel carbon-in-column (CIC) circuits. Gold is recovered from solution by electrowinning and poured into doré bars at the in the mill refinery.

Higher grade ore from the Fort Knox mine is processed in the CIP mill, which is located near the Fort Knox open pit. The mill processes ore 24 hours per day, 365 days per year at a nominal capacity of 36,287 t/d (40,000 stpd) of fresh feed. The mill includes of a primary crusher, a conventional semi-autogenous mill and 2 ball mills operating in closed circuit with hydrocyclones to control grind size, gravity concentrators to recover coarse gold, cyanide tank leaching, recovery of gold on activated carbon in the CIP circuit, and a carbon elution and carbon regeneration circuit.

Recoveries & Grades:

CommodityParameter2019201820172016201520142013
Gold Equivalent Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Equivalent Head Grade, g/t 0.550.50.840.690.760.660.82
Subscription required - Subscription is required.

Production:

CommodityUnits201920182017201620152014
Gold Equivalent oz  ......  Subscription required  ......  Subscription required381,115409,844401,553379,453
All production numbers are expressed as metal in doré.
Subscription required - Subscription is required.

Operational Metrics:

Metrics201920182017201620152014
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required31,750 kt22,761 kt14,886 kt
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required42,360 kt38,664 kt39,386 kt
Daily milling capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required45,000 t36,287 t
Subscription required - Subscription is required.

Reserves at December 31, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 43,982 kt Gold 0.4 g/t 541 koz
Probable 211,828 kt Gold 0.3 g/t 2,260 koz
Proven & Probable 255,810 kt Gold 0.3 g/t 2,801 koz
Measured 6,670 kt Gold 0.4 g/t 80 koz
Indicated 170,063 kt Gold 0.4 g/t 1,946 koz
Measured & Indicated 176,733 kt Gold 0.4 g/t 2,026 koz
Inferred 86,054 kt Gold 0.3 g/t 774 koz

Commodity Production Costs:

CommodityUnits201920182017201620152014
Cash costs (sold) Gold Equivalent USD  ......  Subscription required  ......  Subscription required 628 / oz 741 / oz 629 / oz 712 / oz
Subscription required - Subscription is required.

Financials:

Units2019201820172016201520142013
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 140.8   86   135.3  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 467  
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -168.8   106.7  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -180.8   99.9   251  
Subscription required - Subscription is required


Heavy Mobile Equipment as of June 11, 2018:
HME TypeModelQuantityStatus
Loader ....................... Subscription required 2 Existing
....................... Subscription required ....................... Subscription required 1 Proposed
Shovel (hydraulic) ....................... Subscription required 3 Existing
Shovel (hydraulic) ....................... Subscription required 1 Existing
Truck (haul) ....................... Subscription required 9 Existing
Truck (haul) ....................... Subscription required 25 Existing
....................... Subscription required ....................... Subscription required 3 Proposed
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 28, 2020
....................... Subscription required ....................... Subscription required Subscription required Sep 28, 2020
....................... Subscription required ....................... Subscription required Subscription required Sep 28, 2020
....................... Subscription required ....................... Subscription required Subscription required Sep 28, 2020
....................... Subscription required ....................... Subscription required Subscription required Sep 28, 2020
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2018
Subscription required 2017
Subscription required 2016
Subscription required 2015
Subscription required 2014
Subscription required 2013

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
Annual Information Form 2017
Financial Review 2017
Management Discussion & Analysis 2017
Other 2017
Press Release 2017
Year-end Mineral Reserves 2017
Annual Information Form 2016
Annual Report 2016
Other 2016
Press Release 2016
Annual Report 2015
Other 2015
Technical Report 2015
Year-end Mineral Reserves 2015
Annual Report 2014
Other 2014
Other 2013
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Aerial view:

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