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United States
Greens Creek Mine

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 Location:
27 km SW from Juneau, Alaska, United States

  Address:
PO Box 32199
Juneau
Alaska, United States
99803
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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Silver
  • Gold
  • Lead
  • Zinc
Mining Method
  • Cut & Fill
  • Drift & Fill
  • Longhole stoping
  • Paste backfill
Production Start...
Mine Life2034
Hecla’s Greens Creek Mine in southeast Alaska is one of the largest and lowest-cost primary silver mines in the world.


Owners

Source: p. 47
CompanyInterestOwnership
Hecla Mining Company 100 % Indirect
The Project core claims at Big Sore are held in the name of Hecla Greens Creek Mining Company, a wholly-owned Hecla subsidiary.

Contractors

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Deposit Type

  • Hybrid


Summary:

Work by Taylor and Johnson (2010) in the USGS Professional Paper 1763 indicated that the Greens Creek deposit displays a range of syngenetic, diagenetic, and epigenetic features that are typical of volcanic massive sulfide deposits (VMS), sedimentary exhalative (SEDEX), and Mississippi Valley-type (MVT) genetic models. Based on those observations the investigators indicated that the Greens Creek mineral deposit was a ‘hybrid’ type with elements of several deposit models.

Due to variations in mineralization, structural complexity, and spatial location, the Greens Creek mineralization is segregated into nine separate mineralized zones. In order from easternmost and highest elevations to westernmost, the zones are:
• East;
• West;
• 9A;
• Northwest West;
• Upper Plate;
• 5250;
• Southwest;
• 200 South;
• Gallagher.

The mineralization is stratigraphically controlled and typically found at the contact between the phyllites (stratigraphic footwall) and the argillites (stratigraphic hanging wall). Due to the intense structural deformation, mineralization may be tightly folded into the phyllite or argillite packages such that the original stratigraphic relationships are unclear. In rare cases there may be areas where the mineralized materials are stratigraphically above the phyllite/argillite contact but still proximal to it.

On a gross deposit scale the mineralization trends N 30° W and plunges to the so ........


Mining Methods

  • Cut & Fill
  • Drift & Fill
  • Longhole stoping
  • Paste backfill


Summary:

Greens Creek is a portal accessed mine that utilizes conventional rubber-tired mining equipment, and drill and blast techniques. Production mining is primarily executed using cut and fill and drift and fill methods, supplemented by longhole stoping where orebody geometry permits.

The orebody is complex which has resulted in each of the nine mining zones being unique in size and shape. Each requires differing levels of mine development infrastructure which is included in the mine plan. Ore handling is performed with a fleet of underground haulage trucks and scoop trams or load-haul-dump units (LHDs). Waste is either trucked out of the mine to the waste disposal area or is placed in previously mined-out stopes when available. All LHDs are equipped with remote operating capability and can be operated from an operations room on surface. Production areas are backfilled with either paste fill, created from concentrator tailings, or cemented or uncemented rock depending on future strength requirements.

Fresh air is fed into the mine via the 920 level access portal and distributed through a series of internal ramps and raises, and exhausts through the 1350 level portal and the 2853 surface raise. A ventilation on demand (VOD) system is currently in place in a limited number of headings and is planned to be extended to the remainder of the mine.

The LOM plan is based on a 2,300 stpd production rate continuing through to the end of mine life in 2035. Or ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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Production:

CommodityProductUnits2023202220212020201920182017
Silver Metal in conc./ doré koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required7,9538,352
Gold Metal in conc./ doré koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead Metal in concentrate tons  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc Metal in concentrate tons  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202220212020201920182017
Daily ore mining rate  ......  Subscription required  ......  Subscription required
Tonnes milled  ......  Subscription required  ......  Subscription required818,408 tons846,076 tons845,398 tons839,589 tons
Daily milling rate  ......  Subscription required  ......  Subscription required2,236 tons2,318 tons2,316 tons2,300 tons
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Reserves at December 31, 2022:
The reserve and resource NSR cut-off values for Greens Creek are $210/ton for all zones except the Gallagher Zone at $215/ton; metallurgical recoveries (actual 2022): 81% for silver, 72% for gold, 82% for lead, and 89% for zinc.

CategoryTonnage CommodityGradeContained Metal
Proven 7 k tons Silver 16.1 oz/ton 108 koz
Proven 7 k tons Gold 0.07 oz/ton 0.4 koz
Proven 7 k tons Lead 2.3 % 150 tons
Proven 7 k tons Zinc 5.4 % 360 tons
Probable 10,668 k tons Silver 10.9 oz/ton 116,748 koz
Probable 10,668 k tons Gold 0.09 oz/ton 935 koz
Probable 10,668 k tons Lead 2.5 % 264,600 tons
Probable 10,668 k tons Zinc 6.5 % 694,800 tons
Proven & Probable 10,675 k tons Silver 10.9 oz/ton 116,856 koz
Proven & Probable 10,675 k tons Gold 0.09 oz/ton 935 koz
Proven & Probable 10,675 k tons Lead 2.5 % 264,750 tons
Proven & Probable 10,675 k tons Zinc 6.5 % 695,160 tons
Indicated 8,421 k tons Silver 12.9 oz/ton 108,717 koz
Indicated 8,421 k tons Gold 0.1 oz/ton 810 koz
Indicated 8,421 k tons Lead 2.9 % 245,990 tons
Indicated 8,421 k tons Zinc 8 % 675,740 tons
Inferred 2,383 k tons Silver 12.1 oz/ton 28,949 koz
Inferred 2,383 k tons Gold 0.07 oz/ton 178 koz
Inferred 2,383 k tons Lead 2.8 % 67,400 tons
Inferred 2,383 k tons Zinc 6.9 % 164,080 tons

Commodity Production Costs:

CommodityUnits2023202220212020201920182017
Credits (by-product) Silver USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -24.01 / oz   -21.83 / oz  
Cash costs Silver USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 22.9 / oz   22.5 / oz  
Cash costs Silver USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -1.13 / oz†   0.71 / oz†  
All-in sustaining costs (AISC) Silver USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 29.6 / oz   27.6 / oz  
All-in sustaining costs (AISC) Silver USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 5.58 / oz†   5.76 / oz†  
^ Guidance / Forecast.
† Net of By-Product.
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Operating Costs:

Units20222021202020192018201720162015
UG mining costs ($/ton milled) USD 73.1  64.8  64.3  63  64.9  
Processing costs ($/ton milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Total operating costs ($/ton milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
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Financials:

Units2023202220212020201920182017
Capital expenditures (planned) M USD  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 43.6   35.3  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 265.6   278.3  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 70.3   70.1  
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 75.6   76.5  
Book Value M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 605.7   611  
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Water Supply
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Heavy Mobile Equipment as of December 31, 2021:
HME TypeModelQuantity
Concrete sprayer ....................... Subscription required ....................... Subscription required
Dozer (crawler) ....................... Subscription required ....................... Subscription required
Drill (long hole) ....................... Subscription required ....................... Subscription required
Drill (long hole) ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Jumbo ....................... Subscription required ....................... Subscription required
Jumbo ....................... Subscription required ....................... Subscription required
Jumbo ....................... Subscription required ....................... Subscription required
Jumbo ....................... Subscription required ....................... Subscription required
Load-Haul-Dump (LHD) ....................... Subscription required ....................... Subscription required
Load-Haul-Dump (LHD) ....................... Subscription required ....................... Subscription required
Load-Haul-Dump (LHD) ....................... Subscription required ....................... Subscription required
Rock bolter ....................... Subscription required ....................... Subscription required
Rock bolter ....................... Subscription required ....................... Subscription required
Rock bolter ....................... Subscription required ....................... Subscription required
Rock bolter ....................... Subscription required ....................... Subscription required
Rock bolter ....................... Subscription required ....................... Subscription required
Rock bolter ....................... Subscription required ....................... Subscription required
Trans Mixer ....................... Subscription required
Trans Mixer ....................... Subscription required ....................... Subscription required
Truck (fuel / lube) ....................... Subscription required ....................... Subscription required
Truck (underground) ....................... Subscription required ....................... Subscription required
Truck (underground) ....................... Subscription required ....................... Subscription required
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Feb 27, 2023
....................... Subscription required ....................... Subscription required Subscription required Feb 27, 2023
....................... Subscription required ....................... Subscription required Subscription required Feb 27, 2023
....................... Subscription required ....................... Subscription required Subscription required Feb 27, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 3, 2023
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Staff:

EmployeesYear
Subscription required 2022
Subscription required 2021
Subscription required 2020
Subscription required 2019
Subscription required 2018
Subscription required 2017
Subscription required 2016
Subscription required 2015

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2023
Press Release 2023
Form 10-K 2022
Press Release 2022
Technical Report 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Form 10-K 2018
Technical Report 2018
Year-end Mineral Reserves 2018
Form 10-K 2017
Form 10-K 2016
Annual Report 2015
Form 10-K 2015
Annual Report 2014
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