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Sweden
Garpenberg Mine

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 Location:
45 km SE from Falun, Sweden

  Address:
Kaspersbo 20
Garpenberg
Sweden
SWE-776-98
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Zinc
  • Silver
  • Lead
  • Copper
  • Gold
Mining Method
  • Pillar mining
  • Cut & Fill
  • Sub-level stoping
Processing
  • Flotation
Mine Life25 years (as of Jan 1, 2019)


Owners & OPERATOR

Source: p. 75
CompanyInterestOwnership
Boliden AB 100 % Indirect
Boliden Mineral AB (operator) 100 % Direct

Deposit Type

  • Stratabound (SMS)


Summary:

Geology
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 is the largest sulphide deposit in the region, and comprises several individual ore bodies distributed over a distance of 4 km along a limestone horizon, see Figure 3-3. The main host rock is calcitic marble (limestone) altered to dolomite and Mg +/- Mn-rich skarns. The footwall comprises of strongly phlogopite-biotite-cordierite-sericite-quartz altered felsic volcaniclastic rocks, whereas the hanging-wall comprises relatively unaltered volcaniclastic and sedimentary rocks and dacitic intrusions. The stratigraphic succession is attributed to the volcanic cycle of a felsic caldera complex, and includes rhyolitic to dacitic, juvenile pumiceous, graded mass-flow breccia deposits and rhyolitic to dacitic ash-siltstone and sandstone in the footwall, and polymict conglomerates and juvenile, rhyolitic, pumiceous breccias in the hanging-wall. These 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 hosting the ore is interpreted as a stromatolitic carbonate platform, formed in a shallow, marine environment during a hiatus in volcanism.

The ore-host limestone shows a complex geometry due to large scale folding, shearing and faulting. Folding and late faults have locally remobilized the ore into fault- and fracturehosted sulphide veins, some of which have been thick enough and rich enough to mine. 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 Lappberget ore body is interpreted as an over 1.5 km long, subvertical anticlinal tube fold with the top of the antiform just below 200z. 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 pre-date regional metamorphism and deformation (Jansson & Allen, 2011).

The Garpenberg mine encompasses several ore bodies which follow a limestone-marble horizon occurring in a synform structure. The structure is compressed at the southern end and opens to the north. The horizon is strongly isoclinally folded and the structure tectonic and divided into blocks. The ore bodies occur in the contact zone between the limestone and underlying siltstones. The contact zone is heavily altered to skarn and the limestone to dolomite. The structures are consistently steeply dipping


Mining Methods

  • Pillar mining
  • Cut & Fill
  • Sub-level stoping


Summary:

Almost 90% of the mined ore in Garpenberg is extracted by sublevel stoping (also called longhole stoping), where the ore is mined in layers between two drifts vertically 25 m apart. Most areas are mined with transversal longhole stoping, where the development and stope axis are perpendicular to the strike of the orebody. In some more narrow areas, longitudinal longhole stoping is used. The orientation of this method is along or parallel to the strike of the orebody. The ore body is split into primary and secondary stopes, which are mined in a predefined order and pyramid shape sequence. The standard stope dimensions are 24 - 25m high, 10 m wide for primary stopes and 15 m wide for secondary stopes. In Lappberget, the ore body is divided in mining blocks with 6 levels of stopes in each block. The last level of each mining block is the sill pillar, which separates the different mining blocks. This division allows the mine to have several production areas being scheduled and mined at the same time.

Another consideration that was recently introduced concerning the mine design of Lappberget is the division into a main and a second pass sequence (2pass). The main sequence contains more of the high grade areas and is scheduled prior to the second pass sequence, which in general contain lower grade ore.

Other mining methods include cut and fill and avoca (rill). With the cut and fill method, mining is carried out in slices along the steeply dipping, narrow ore body. The bottom slice is mined first. The excavated area is then backfilled, so mining can continue with the slice above. The rill method used in Garpenberg is in fact similar to longitudinal stopping, but the stopes are split in 20 m long slices. After being blasted and mucked, the stopes are backfilled before the next slice is blasted. This process repeats until the full size of the stope is done.


Crushing and Grinding
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher 2
AG mill 1

Summary:

The expansion project to 2.5 Mt which was completed in 2014 increased the capacity of the mine with the construction of new crushers, shafts, ore hoists, etc. Today there are two underground crushing plants at 700 z and 1087 z. Transport to the crushers is done by trucks from the active mining areas. The crushed ore is hoisted to surface in a shaft, unloaded into a bin in the headframe and then transported by conveyor belts to an intermediate ore storage, which can hold approximately a week of production.

In the concentrator, the ore is ground in two stages with autogenous grinding in the primary stage and pebble mill grinding in the second. After grinding, the ore is screened, with the coarse fraction being returned to the primary mill.


Processing

  • Flotation

Flow Sheet: Subscription required

Summary:

After grinding, the ore is screened, with the coarse fraction being returned to the primary mill and the fine fraction undergoing gravimetric separation (Knelson) in order to separate coarse gold out at an early stage of the process. Knelson concentrate is collected in big bags. After gravity separation, material is classified using hydrocyclones. The overflow constitutes the main flotation feed, while the underflow undergoes flash flotation in the grinding circuit, from which the concentrate is sent directly to CuPb separation in the flotation plant and the tailings back to the mills.

Flotation is carried out in a three-stage process flotation circuits: CuPb flotation, CuPb separation and Zn flotation. Regrind mills are installed both in the CuPb and Zn circuits. The mineral concentrates are dewatered using thickeners and pressure filters. Three mineral concentrates are produced in flotation: zinc, lead and copper concentrates. The precious metals report primarily ........

Recoveries & Grades:

CommodityParameter201920182017201620152014
Zinc Head Grade, %  ......  Subscription required  ......  Subscription required4.34.455.1
Zinc Concentrate Grade, %  ......  Subscription required  ......  Subscription required53.554.35554.6
Silver Head Grade, g/t  ......  Subscription required  ......  Subscription required113150156136
Lead Head Grade, %  ......  Subscription required  ......  Subscription required1.81.82.12.1
Lead Concentrate Grade, %  ......  Subscription required  ......  Subscription required70.972.770.763.1
Copper Head Grade, %  ......  Subscription required  ......  Subscription required0.10.10.10.1
Copper Concentrate Grade, %  ......  Subscription required  ......  Subscription required16.315.216.314.8
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required0.30.30.30.3

Production:

CommodityProductUnits201920182017201620152014
Zinc Metal in concentrate kt  ......  Subscription required10110710910899
Zinc Concentrate kt  ......  Subscription required191201200196182
Silver Metal in concentrate koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead Metal in concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead Concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Metal in concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper 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
Subscription required - Subscription is required.

Operational Metrics:

Metrics201920182017201620152014
Tonnes milled  ......  Subscription required  ......  Subscription required2,634 kt2,622 kt2,367 kt2,224 kt
Subscription required - Subscription is required.

Reserves at December 31, 2018:

CategoryTonnage CommodityGrade
Proven 22,800 kt Zinc 3.6 %
Proven 22,800 kt Silver 101 g/t
Proven 22,800 kt Lead 1.4 %
Proven 22,800 kt Copper 0.03 %
Proven 22,800 kt Gold 0.24 g/t
Probable 53,400 kt Zinc 2.9 %
Probable 53,400 kt Silver 94 g/t
Probable 53,400 kt Lead 1.4 %
Probable 53,400 kt Copper 0.05 %
Probable 53,400 kt Gold 0.32 g/t
Measured 4,400 kt Zinc 3.3 %
Measured 4,400 kt Silver 100 g/t
Measured 4,400 kt Lead 1.6 %
Measured 4,400 kt Copper 0.06 %
Measured 4,400 kt Gold 0.31 g/t
Indicated 35,400 kt Zinc 2.8 %
Indicated 35,400 kt Silver 88 g/t
Indicated 35,400 kt Lead 1.3 %
Indicated 35,400 kt Copper 0.05 %
Indicated 35,400 kt Gold 0.35 g/t
Inferred 19,100 kt Zinc 2.8 %
Inferred 19,100 kt Silver 56 g/t
Inferred 19,100 kt Lead 1.7 %
Inferred 19,100 kt Copper 0.08 %
Inferred 19,100 kt Gold 0.48 g/t

Commodity Production Costs:

CommodityUnits201920182017201620152014
C1 cash costs Zinc USD  ......  Subscription required 0.47 / lb 0.46 / lb 0.43 / lb 0.45 / lb 0.56 / lb
Subscription required - Subscription is required.

Financials:

Units201920182017201620152014
Capital expenditures M SEK  ......  Subscription required395  377   317   336   916  
Revenue M SEK  ......  Subscription required3,700  4,019   3,491   2,862   2,318  
Operating Income M SEK  ......  Subscription required2,225  2,606   2,063   1,452   919  
Subscription required - Subscription is required


Heavy Mobile Equipment as of December 31, 2017:
HME TypeModelQuantity
Cable bolter ....................... Subscription required 1
Drill ....................... Subscription required 6
Drill (long hole) ....................... Subscription required 1
Drill (long hole) ....................... Subscription required 1
Drill (long hole) ....................... Subscription required 2
Loader ....................... Subscription required 3
Rock bolter ....................... Subscription required 6
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 26, 2021
....................... Subscription required ....................... Subscription required Subscription required Mar 26, 2021
Subscription required - Subscription is required.

Staff:

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

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Quarterly Report 2018
Year-end Mineral Reserves 2018
Annual Report 2017
Fact Sheet 2017
Other 2009
Subscription required - Subscription is required.

Aerial view:

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