ABB Hoisting Systems at Kemi Mine, Finland

3AST002875 04-03-23 13.36 Sida 1

Head frame of ABB mine hoist at Pyhäsalmi Mine. 3AST002875 04-03-23 13.36 Sida 2

The Kemi Mine The Kemi Mine, situated close to the town of Kemi near the Gulf of Bothnia coast in northern Finland, is part of Outokumpu Chrome Oy. It produces chrome concentrates that are used as raw materials in the company’s ferrochrome works in Tornio. The chrome deposit was discovered in 1959 and the decision to start exploitation of the ore was made in 1964. At the end of September 2003 the company inaugurated underground mining at the Kemi Mine. ABB has supplied two complete mine hoisting systems that are part of the project, where Kemi Mine will gradually switch over from open pit to underground mining in order to lower the production costs.

The central control room at Kemi Mine

Scope of delivery for friction type production hoist Mechanical Electrical • Pulley, diameter 3.2 m, with friction • HV/LV transformer linings, shaft, bearings, couplings •1,600 kW induction motor and gearbox • ACS600 fully digital frequency •Deflection sheaves with one converter with DTC, Direct Torque sheave fixed to the shaft and the Control with active front end that other floating on the shaft controls the power factor at unity, • Skip with integrated cage on one i.e. does not produce any reactive side and a counterweight on the power. Further, the harmonic other side current generation in the converter • Measuring pocket at loading station is very low •4 head ropes with attachments • Advant controller AC110-based including hydraulic adjuster links hoist control system for fully and rope tension measurement automatic control of both skip hoisting and men transportation •3 tail ropes with attachments from three levels in the shaft •Top and bottom overwinding • Operator control desk in the wedge-type arrestors central control room and local • Half-locked coil guide ropes, operating unit in the headframe four for the skip/cage and two • Low-voltage distribution including for the counterweight power supply for the control system •Hydraulic disc brake system with and auxiliary motors controlled retardation • Loading control box and cage shaft •Groove turning device for trimming level control boxes for hoist the diameters of the friction linings operation • Skip loading apparatus, hoist control shaft apparatus and cage boarding apparatus at the shaft levels • AHM110 digital hoist monitor to provide back-up protection and supervision of the control system Hydraulic station for the brake system 3AST002875 04-03-23 13.37 Sida 3

ACS600 drive for the production hoist Production hoist with 1,600 kW induction motor

Scope of delivery for single drum service hoist Mechanical Electrical • Low-voltage distribution including •Drum, diameter 1.16 m, with shaft, • HV/LV transformer power supply for the control system and auxiliary motors bearings, couplings and gearbox • 75 kW induction motor • Control boxes for the service • Head sheave • ACS600 fully digital frequency hoist levels • Cage converter with DTC, Direct • Hoist control shaft apparatus and • Head rope with attachments Torque Control cage boarding apparatus at the • Advant controller AC110-based •Hydraulic disc brake system with shaft levels including moveable hoist control system for fully controlled retardation platforms automatic control of men trans- •4 half-locked coil guide ropes portation from four levels in the • AHM110 digital hoist monitor to shaft provide back-up protection and supervision of the control system • Operator control desk in the central control room and local operating unit in the headframe

Disc brake system for the production hoist Rope attachments for the production hoist Skip with lower inspection platform 3AST002875 04-03-2313.37Sida4 a:+4621185890 www.abb.com/mining Fax: 00 00 +462134 Phone: Sweden SE-721 67Västerås, Mining Department ABB AutomationTechnologies AB General dataofthehoistingsystemsatKemiMine oln omI 1 IC411 992rpm 400V 50Hz 75kW ACS600 Inductionmotor IC416 1,041rpm 1.16m 3m/s 600kg 6persons 52.2Hz 690V 1,600kW Inductionmotor 538m 5.2m Cooling form ACS600 Motor speed Motor frequency 20persons Motor voltage 26tonnes 10m/s 3.2m Motor output Motor type Drive system 574m Pulley/drum diameter 5.2m Cage capacity Design speed Payload Hoisting distance Shaft diameter rdcinhitServicehoist Production hoist