Boliden Area Operations (BAO) Gold Mines, Sweden

In 1924 Holmtjarn deposit discovered Boliden Skelleftea northern Sweden. after Boliden Company formed. Although mine shut 1967 concentrator continued treat ores Boliden mines (40 years) supply Ronnsk?r smelter Boliden opened Skelleftehamn Baltic coast 1930. Today Maurliden pit Kristineberg Petiknas Renstr?m underground mines plus Boliden concentrator referred company's Boliden Operations (BAO).

SBM VSI5X Impact Crusher, VSI Impact Crusher, PE Jaw Crusher, JCE Jaw Crusher

Since January 2004 Boliden AB Outokumpu Oy consolidated zinc copper smelting interests operations owned Boliden world’s fourth largest zinc-mining company leading metals-smelting firm achieved results 2005.

GEOLOGY RESERVES

In Skelleftea field mineralisation precambrian supracrustal rocks structurally deformed granite intrusions. Typically complex sulphide deposits occur boundary volcanic sedimentary rocks considerable depth.

SBM VSI Impact Crusher, PE Jaw Crusher, JCE Jaw Crusher, Symons Cone Crusher

Consequently despite having explored 70 years deposits continue identified. company continues allocated funding exploration here aiming define sufficient reserves beyond 2015. on-going effort recently located high-grade zinc-silver K-zinc zone copper-gold-zinc mineralisation J-zone Kristineberg. Previous finds include Simon Renstr?m zones Renstr?m Maurliden copper-zinc orebody being mined pit.

"As January 2006 total BAO proven polymetallic reserves 150,000t grading 8.9% zinc 1.0% lead 0.4% copper 1.4g/t 151g/t silver."

Independently Atlantic Natural Resources (now Lundin Mining) discovered Storliden copper-zinc deposit Malå started shipping Boliden concentrator mid-2002.

SBM PE Jaw Crusher, JCE Jaw Crusher, Symons Cone Crusher, Hydraulic Cone Crusher

As January 2006 total BAO proven polymetallic reserves 150,000t grading 8.9% zinc 1.0% lead 0.4% copper 1.4g/t 151g/t silver. Probable sulphide reserves totalled 2.77Mt 6.6% zinc. addition Kristineberg proven reserves 30,000t grading 7.1g/t Au 4g/t Ag 0.9% Cu. Measured polymetallic resources totalled 360,000t 3.2% zinc 1.7% copper 7.1g/t 69g/t silver. Indicated inferred polymetallic resources totalled 7.4Mt indicated inferred resources ?kulla Kristineberg totalled 2.4Mt.

MINING

The polymetallic supplied Boliden concentrator 2005 Maurliden pit started 2000 established underground mines.

SBM JCE Jaw Crusher, Symons Cone Crusher, Hydraulic Cone Crusher, Spring Cone Crusher

The underground mines mainly worked various cut-and-fill techniques activities thoroughly mechanised. cuts worked contractors. recent investment connection Petikn?s Renstr?m shaft rail haulage 800m level.

ORE PROCESSING

The concentrator commissioned 1953 rebuilt 1989–91 increasing capacity 1.5Mt/y improving performance. redesign introduced autogenous grinding flotation cells pressure filtration process information system Nordic manufacturers supplying equipment. flotation process control technologies introduced SEK100m leaching commissioned 2001 treat gold-rich ore mainly Einarsson zone Kristineberg discovered 2000. Processing Storliden necessitated further circuit optimisations capacity 1.6Mt/y ore.

SBM Symons Cone Crusher, Hydraulic Cone Crusher, Spring Cone Crusher, Jaw Crusher Mobile Crusher

Concentrates railed nearby Ronnsk?r smelter (see Aitik mine profile).

PRODUCTION

The Boliden concentrator maintained production levels 2005. 1.78Mt treated graded 6.1% zinc 1.5% copper 0.6% plus 2.1g/t 78g/t silver. Yields 161,613t 54% zinc concentrate 75,542t 27.5% copper concentrate 10,516t 28.9% concentrate plus 347t precious-metals concentrate 2,480kg doré metal. Contained metal-in-concentrate outputs 87,276t zinc 20,746t copper 87,212kg silver 2,428kg gold.

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