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Finland
Kylylahti Mine

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 Location:
1.7 km W from Polvijarvi, Finland

  Address:
Kaivostie 9
Polvijärvi
Finland
FIN-83700
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StatusClosing / Closed
Mine TypeUnderground
Commodities
  • Copper
  • Zinc
  • Gold
  • Nickel
  • Cobalt
Mining Method
  • Longitudinal stoping
  • Cemented backfill
Production Start...
The mine was closed in 2020, but further exploration is taking place.


Owners

Source: p. 86
CompanyInterestOwnership
Boliden AB 100 % Indirect
Boliden Kylylahti OY. (operator) 100 % Direct
In 2014, Boliden acquired the exploration rights and mining operations of the Kylylahti copper mine in Finland.

Contractors

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Deposit Type

  • Hydrothermal
  • Vein / narrow vein
  • VMS


Summary:

The NKSB itself consists dominantly of folded and imbricated metasedimentary sequences representing two major tectonic-stratigraphic units. The older, 2.5-2.0 Ga, Sariola and Jatuli sequences comprise autochthonous, shallow-water cratonic to epicratonic metasedimentary deposits resting discordantly on the Archaean gneissic basement (Kohonen & Marmo 1992). The younger, 2.0-1.90 Ga, Kaleva sequences contain mainly deeper water turbidite deposits. Lower Kaleva rocks are considered autochtonous, but most voluminous Upper Kaleva rocks, that surround Kylylahti on all sides, are of allochtonous origin with depositional age of 1.95 – 1.92 Ga (Lahtinen et al. 2010). Upper Kaleva rocks were thrust over onto current location from direction that now lies in west 1.92 – 1.87 Ga ago (Peltonen et al 2008).

Kylylahti geology
Kylylahti is a polymetallic sulphide deposit featuring a 1.5 km long, north-northeast elongated group of lenses with a sub vertical attitude, that plunges from surface to the south southwest at approximately 30 degrees. The mineralized lenses have an average sub vertical height of approximately 150 m. Each lens has width ranging from 2 to 60 meters.

The hanging wall of Kylylahti deposit is an ophiolithic mantle fragment thrust onto place with the Upper Kaleva rocks. Mostly this once metaperidotitic ophiolite consists of serpentinite, but has later altered on the sides into talc-carbonate, skarn and quartz-sulphide rocks. These serpentinites, ........


Mining Methods

  • Longitudinal stoping
  • Cemented backfill


Summary:

The main mining methods used in Kylylahti are transverse and longitudinal open stoping (or longhole stoping) with cemented rock fill (CRF) and/or waste rock used as backfill. Transverse stoping is used in the wide parts of the orebody and longitudinal stoping in the narrow parts. The typical spacing between production levels is 30 m. Due to the gentle dip of the orebody, stoping in the main production areas have started from the bottom at the northern end of the orebody and advanced upwards (see Figure 16). Smaller production areas are located at the top of the orebody, and ore pillars have been left below the levels where mining has started. Most of the ore in the horizontal pillars will be mined before closing the operation. Some stopes are located near or within existing access tunnels and these will be mined out at the end of mine life.

Transverse stoping advances in two stages. First, a 10 m wide block perpendicular to the orebody, so called primary stope, is mined and backfilled with CRF. Later, the remaining 15 m wide block, so called secondary stope, is mined and backfilled with waste rock. In longitudinal stoping, the stoping advances along the orebody. When a longitudinal stope is mined out, the end towards the next stope in mining sequence is backfilled with CRF while the rest of the stope is backfilled with waste rock. Then the next stope is blasted against the CRF backfill.

Stopes are drilled with longhole drill rigs. Both upwards and d ........


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityProductUnits202020192018201720162015
Copper Metal in concentrate t  ......  Subscription required  ......  Subscription required7,3539,68612,12311,835
Copper Concentrate kt  ......  Subscription required  ......  Subscription required42516162
Zinc Metal in concentrate t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc Concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Metal in concentrate oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Nickel Metal in concentrate t  ......  Subscription required  ......  Subscription required  ......  Subscription required
Cobalt Metal in concentrate t  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018201720162015
Tonnes milled  ......  Subscription required716 kt785 kt809 kt797 kt733 kt
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Reserves at December 31, 2019:

CategoryTonnage CommodityGrade
Proven 400 kt Copper 0.7 %
Proven 400 kt Zinc 0.3 %
Proven 400 kt Gold 1.1 g/t
Proven 400 kt Nickel 0.24 %
Proven 400 kt Cobalt 0.18 %
Probable 100 kt Copper 0.3 %
Probable 100 kt Zinc 0.1 %
Probable 100 kt Gold 1.8 g/t
Probable 100 kt Nickel 0.27 %
Probable 100 kt Cobalt 0.1 %
Proven & Probable 500 kt Copper 0.6 %
Proven & Probable 500 kt Zinc 0.3 %
Proven & Probable 500 kt Gold 1.2 %

Commodity Production Costs:

CommodityUnits20202019201820172016
C1 cash costs Copper USD  ......  Subscription required†  ......  Subscription required† 1.98 / lb†   1.53 / lb†   1.43 / lb†  
† Net of By-Product.

Financials:

Units20202019201820172016
Capital expenditures M SEK  ......  Subscription required  ......  Subscription required 10   24   97  
Revenue M SEK  ......  Subscription required  ......  Subscription required 674   708   573  
Operating Income M SEK  ......  Subscription required  ......  Subscription required -31   34   -28  



Heavy Mobile Equipment:

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Staff:

EmployeesYear
Subscription required 2020
Subscription required 2019
Subscription required 2018
Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Corporate Presentation 2018
Other 2018
Quarterly Report 2018
Year-end Mineral Reserves 2018
Annual Report 2017
Press Release 2017
Press Release 2014
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