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Boliden Garpenberg

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Boliden Garpenberg Boliden Garpenberg Welcome to a world class operation Boliden Garpenberg in Hedemora municipality is now one of the world’s most modern mines. At the same time, it is Sweden’s oldest mining area that is still in operation. Zinc, lead, copper, silver and gold are extracted from the ore that is mined. The operation is conducted with very strict goals when it comes to health, safety and environment. Nobody should be injured at work and our impact on the surrounding environment should be minimal. Boliden has owned the Garpenberg mine since 1957, at that time around 300,000 tonnes of ore were mined each year. Since then the production has increased steadily. In 2011 it was decided to invest SEK 3.9 billion in an expansion of the operation in Garpenberg, with the aim of increasing production to 2.5 million tonnes of ore annually. Boliden Garpenberg currently has around 400 employees. This is Boliden Garpenberg 3 6 5 4 2 8 1 Tailings Management Facility The Tailings Management Facility (TMF), Ryllshyttemagasinet, has been in operation since the mid-1960s and has a lifetime that will cover the operation’s needs for the next 20 years. The tailings from the concentrator that is not back filled in the underground mine is deposited in the TMF. By optimising the management of the TMF, the discharges of metals from the operation will be minimised. 7 9 1 Mine office 9 2 Headframe – personnel hoist 10 3 Headframe – ore hoist 9 4 Mine ventilation 5 Water treatment plant 6 LPG plant 7 Ore storage 8 Paste fill plant 9 Concentrator 11 10 Concentrator office 11 Electrical substation Charging and blasting Crushing The process Rock reinforcement The mining and concentrating process In Garpenberg, the ore is mined and crushed under- ground. The ore is transported to the concentrator above ground where the valuable minerals are extract- ed. Mineral concentrates are produced and transported to the customers. 6 6 6 6 6 6 6 1 1 2 1 23 23 4 1 3 14 5 2 14 25 3 253 4 3 4 5 4 5 5 1 2 3 7 4 7 5 7 7 7 7 8 7 8 8 8 8 8 8 12 12 12 12 12 12 9 10 10 10 9 9 10 1210 9 9 9 9 10 10 Drilling 11 11 11 11 11 11 11 Loading and transport Ore hoisting Grinding Dewatering – thickening Dewatering – filtering 6 6 6 6 6 1 1 2 2 3 3 4 4 5 5 1 1 2 2 3 3 4 1 4 5 2 5 3 4 7 7 5 7 7 87 8 8 8 8 6 6 1 1 2 2 3 3 4 4 5 5 7 7 8 8 12 12 9 10 1210 12 12 9 9 9 10 10 9 10 11 11 11 11 11 6 1 2 3 4 5 12 12 7 9 9 10 10 8 Flotation 11 11 12 9 10 11 Concentrate Tailings Ore feed transport From mining to delivery Ore is mined and processed in Boliden Garpenberg 365 days a year. Follow the journey from mining below ground to the transport of concentrate. Underground mine drifting and cut-and-fill mining is performed Grinding Concentrate transport The Garpenberg mine is an underground mine with a wheel loader. The ore is transported using The ore is transported on belt conveyors from The zinc and lead concentrates are transported where the ore is mined from between 500 to trucks to one of the two underground crushing the ore storage to the grinding circuit. Water is by truck to Gävle port for onward ship trans- more than 1,200 metres below ground level. plants. Ore and waste rock are transported by a added during grinding and the ore is ground port, mainly to our own smelters in Sweden The main mining method is known as sublevel contractor. in two stages, with autogenous grinding in the (Rönnskär), Finland (Kokkola) and Norway stoping. This means that the ore is mined in primary stage and pebble mill grinding in the (Odda). The copper concentrate is trucked and layers between two drifts (tunnels), which are second. Autogenous grinding means that the reloaded to railway for onward transport to the driven through the ore body. Other mining Reinforcement ore grinds itself without the addition of external Rönnskär smelter in Skelleftehamn. At any place in the mine where people are work- methods include cut-and-fill mining, rill mining grinding media. In the pebble mill, pebbles are ing, systematic safety work is performed through and residual mining of sill pillars. added that have been extracted from the autoge- scaling, shotcreting and bolting. During scaling, nous mill. The grinded ore is classified using Tailings loose rock is removed from the ceiling and walls screens and hydrocyclones. The coarse particles, Waste rock, which is mined and separated in the using mechanical scalers. The rock surfaces are Drilling that have not been ground down sufficiently, are mine, are used for back filling in the mine. The then sprayed with a layer of steel fibre-reinforced In the case of sublevel stoping, holes for the returned to the grinding circuit. The grinding portion of the finely ground waste rock that is concrete. Finally, rock bolts are drilled and cast explosives are drilled using vertical drilling rigs. process results in a slurry containing water and separated in the concentrator is known as tailings. in place in a systematic pattern. All of this is The drill holes can be up to 28 metres in length finely ground ore. Some of the tailings are mixed with a binding with a diameter of 76 millimetres. For cut-and- done to minimise the risk of rock falls from the agent and pumped back into the mine for back fill stoping and drifting, tunnel rigs with two ceiling and walls. In certain cases, a different filling. Surplus tailings are deposited in a pond at booms are used. type of reinforcement is required using e.g. cable Flotation the Tailings Management Facility (TMF) from bolts or mesh. In the flotation process, the ore is concentrated where processed water is recovered. and valuable minerals are separated from the Blasting waste rock. The flotation process is a sur- A liquid emulsion explosive is used for blasting. Crushing and hoisting face-chemical process, where small amounts There are two underground crushing plants where The emulsion is mixed mechanically when of chemicals are used to affect the valuable the ore is crushed in jaw crushers. The crushing charging. During sublevel stoping, a normal minerals’ surface characteristics, causing them to plants are situated 700 metres and 1,087 metres round produces approximately 10,000–20,000 become hydrophobic. This means that when air below ground level. After crushing, the ore is tonnes of loose ore. is blown into the slurry, air bubbles are attached hoisted to surface in a shaft. to the surface of the hydrophobic mineral parti- The machinery for the ore hoist is situated above cles and are transported up to the surface of the the shaft installed in the headframe. The ore is Loading and transport flotation cell, where they can be removed. Loading ore from the sublevel stoping area takes unloaded into a bin in the headframe and then place using remote-controlled LHD loaders. transported by a belt conveyor to an intermediate These can either be controlled entirely by an ore storage, which can hold approximately two Dewatering operator or controlled automatically, where days’ of production. The mineral concentrates are dewatered using loading and unloading are performed remote by thickeners and air pressure filters. Three mineral an operator a CCTV camera system is used and concentrates are produced: zinc, lead and copper the transport between is conducted automati- concentrates. The precious metals are reported cally via a local WLAN system. Loading when primarily in the copper and lead concentrates. Nitrogen puri- fication plant Fenton plant The explosives Oxygen-consuming contain nitrogen and substances, known a proportion of this as thiosulphates, nitrogen ends up in are destroyed in the the minewater, which water treatment plant. is pumped from the If these substances mine and to the TMF. reaches the recipient, When the water they can cause oxygen reaches the recipient, deficiency in lakes nitrogen can cause further down in the eutrophication. In the aquatic system. The nitrogen purification Fenton plant removes plant, bacteria convert these substances the nitrogen residue through forced in the water into oxidation. nitrogen gas, which is emitted into the air (which comprises 78% nitrogen) and the purified water continues to the TMF. Safety and the environment In order to meet the strict EHS (environ- ment, health and safety) goals for the Garpen- berg operation a large number of measure- ments are performed by the operation with Mine geology regard to both the exter- Mine geology provides nal environment and the the operation with working environment. important information Noise levels and water about the ore and its quality in lakes and wa- surrounding geology, tercourses are controlled so that the mining in the surrounding area. engineers can plan the Within the opera- mining operations. tion, the health of our It has to be decided employees is examined how and where the ore regularly, as well as air is to be mined, and quality and exposure to what infrastructure is noise in their working needed. areas. Our mining equipment A world class mine requires modern equipment that is both productive and environmentally friendly. DRIFTING 1 x Atlas Copco Boomer LC2 6 x Atlas Copco Boomer E2C LONG HOLE (SUBLEVEL STOPING) 1 x Atlas Copco Simba M7 1 x Atlas Copco Simba ME7 2 x Atlas Copco Simba M6 ROCK BOLTING 6 x Sandvik Robolt DS-510 CABLE BOLTING 1 x Atlas Copco CableTec LC SCALING 5 x Jama SB U 8000 2 x Atlas Copco ScaleTec LC Atlas Copco Boomer E2C Jama SB U 8000 Sandvik LH 517D SHOTCRETING 1 x Jama CSU 800 2 x AMW 6400 LOADERS 3 x Sandvik LH 517D Atlas Copco CableTec LC Jama CSU 800 AMW 6400 Fixed assets In Garpenberg, Boliden has invested in a number of fixed assets that are necessary for the operation.
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