Sweden

Garpenberg Mine

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Categories

Overview

Mine TypeUnderground
Commodities
  • Zinc
  • Silver
  • Lead
  • Copper
  • Gold
Mining Method
  • Sub-level stoping
  • Cut & Fill
  • Avoca
  • Longitudinal stoping
  • Longhole stoping
  • Transverse stoping
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ShapshotGarpenberg – the world’s most productive underground zinc mine.

Owners

SourceSource
CompanyInterestOwnership
Boliden AB 100 % Indirect
Boliden Mineral AB (operator) 100 % Direct
Boliden Mineral AB owns 100 % of the Garpenberg mine.

Deposit type

  • Skarn
  • VMS

Summary:

The Garpenberg mine is situated in the mineralized Palaeoproterozoic igneous province of Bergslagen, south central Sweden, which is host to a variety of ore deposits, and especially Fe-oxide and polymetallic sulphide deposits. Garpenberg, which is the largest sulphide deposit in the region, consists of several individual ore bodies distributed over a distance of 4 km within the Garpenberg supracrustal inlier. The main host rock to the ore is calcitic marble (limestone) altered to dolomite and Mg +/- Mn-rich skarns. The footwall consists of rhyolitic pumiceous, graded massflow breccia and rhyolitic ash-siltstone and sandstone affected by strong phlogopite-biotitecordierite-sericite-quartz alteration. The hanging wall includes polymict conglomerates and rhyolitic pumiceous breccias. The stratigraphic succession is attributed to the volcanic cycle of a felsic caldera complex. The pumiceous breccias in the hanging-wall record a climactic eruption that formed a caldera over 500 m deep and over 9 km in diameter in the Garpenberg area. The limestone horizon is interpreted as a stromatolitic carbonate platform, formed in a shallow, marine environment during a hiatus in volcanism.

The Garpenberg inlier has been interpreted as a NE-SW trending, tight to isoclinal complex syncline with a sub-vertical axial plane (Allen et al., 2003). The structure is compressed at the southern end and opens to the north. The ore-host limestone shows a complex geometry due to large scale folding, shearing and faulting. These structural features have resulted in complex synforms and antiforms, and have a major influence on the position, geometry and metal grades of the ore bodies. The largest ore bodies are linked to antiforms, such as Lappberget and Huvudmalmen.

Mineralization in Garpenberg mainly consists of pyrite, sphalerite, galena and silver minerals. The ore bodies occur at the heavily skarn- and dolomite-altered contact zone between the limestone and underlying metavolcanic rocks, forming massive to semi-massive sulphides ore lenses. There is also significant mineralization in the footwall metavolcanic rocks (mica quartzites) that are stratigraphically underlying the marble horizon. The footwall mineralization is tectonically controlled and forms remobilized semi-compact thin veins that are often associated to mica-rich shear zones. Mineralization is mainly of replacement style and is likely to have taken place where metal-bearing fluids penetrated up along synvolcanic, extensional faults and came in contact with reactive limestone to form large, massive sulphide bodies. The initial main stage of mineralization and alteration at all the known Garpenberg ore bodies is interpreted to be essentially syn-volcanic in timing and to predate regional metamorphism and deformation (Jansson & Allen, 2011).

Reserves

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Mining Methods

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Comminution

Crushers and Mills

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Processing

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Production

CommodityProductUnits20222021202020192018201720162015
Zinc Metal in concentrate kt  ....  Subscribe  ....  Subscribe  ....  Subscribe109101107109108
Zinc Concentrate kt  ....  Subscribe  ....  Subscribe  ....  Subscribe205191201200196
Silver Metal in concentrate koz  ....  Subscribe  ....  Subscribe  ....  Subscribe8,2498,7698,6029,7059,270
Lead Metal in concentrate kt  ....  Subscribe  ....  Subscribe  ....  Subscribe3635393942
Lead Concentrate kt  ....  Subscribe  ....  Subscribe  ....  Subscribe5150555460
Copper Metal in concentrate kt  ....  Subscribe  ....  Subscribe  ....  Subscribe0.70.70.80.70.8
Copper Concentrate kt  ....  Subscribe  ....  Subscribe  ....  Subscribe55555
Gold Metal in concentrate oz  ....  Subscribe  ....  Subscribe  ....  Subscribe16,52217,41317,40618,66117,962

Operational metrics

Metrics202320222021202020192018201720162015
Tonnes milled  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe2,861 kt2,622 kt2,634 kt2,622 kt2,367 kt
Ore tonnes mined  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe2,865 kt2,625 kt2,630 kt2,610 kt
Waste  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe
Total tonnes mined  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe
^ Guidance / Forecast.

Production Costs

CommodityUnits202220212020201920182017
C1 cash costs Zinc USD  ....  Subscribe  ....  Subscribe  ....  Subscribe 0.51 / lb   0.47 / lb   0.46 / lb  

Financials

Units202220212020201920182017
Capital expenditures M SEK  ....  Subscribe  ....  Subscribe  ....  Subscribe 573   395   377  
Revenue M SEK  ....  Subscribe  ....  Subscribe  ....  Subscribe 3,712   3,700   4,019  
Operating Income M SEK  ....  Subscribe  ....  Subscribe  ....  Subscribe 2,079   2,225   2,606  

Heavy Mobile Equipment

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Personnel

Mine Management

Job TitleNameEmailProfileRef. Date
....................... Subscription required ....................... Subscription required ........... Subscription required Subscription required Jun 20, 2023
....................... Subscription required ....................... Subscription required Subscription required Jun 5, 2023
....................... Subscription required ....................... Subscription required Subscription required Jun 5, 2023

EmployeesYear
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Aerial view:

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