Lapland Spring 2009 – 20th May

I  wrote about the mine after my winter trip http://naturallore.wordpress.com/2009/02/11/winter-in-lapland-2009/ but never expected to be given the opportunity to visit it as it is not open to public viewing.

We arrived at the mine just before six in the evening and had to visit security to check-in.  Because Ingvar only speaks Swedish, Finnish and Saami and I only speak a little Swedish and no Finnish or Saami, his brother-in-law Kjell would be my guide.

outside mine (Large)

Here is the processed ore which has been brought to the surface and is waiting to be loaded on to trains to be taken to sea ports at Lulea and Narvik.

piles of ore (Medium)

Here is a piece of  un-processed ore which I was given

ore

and here is the processed ore in pellet form

processed ore (Medium)

As we drove below ground I was not sure what to expect, but I did not expect two lanes of traffic (including large lorries) to be coming and going.  (Now I should mention here that although I got some really nice video footage, my digital camera did not perform as well as I had hoped!!)

inside mine

The two main haulage levels are at 815 and 1000 metres in the Malmberget mine (Malm as I understand being the Saami word for Iron ore).  At each of these levels there are huge crushers through which the mined material is deposited.

crusher

12 huge mine trucks are operated at these levels. I was fortunate enough to be offered a lift in one of these trucks with Veronica and Ann-Sofia.  The trucks are driven to vertical shafts where the driver (in this case Ann-Sofia) controls loading from inside the cab of the truck by remote control.  The fully-loaded truck is then driven to a discharge station and the ore is emptied into a crusher bin.  This is also controlled from the cab of the truck. The ore is fed into the crusher and crushed into lumps of about 100 mm in diameter.

The ore then travels along a 1700 metre conveyor belt and from there is lifted to the surface by two 23 tonne skips at 16m per second.

The huge machinery required for drilling, setting explosive charges, rock supporting, loading and so on (here’s me next to a Toro loader)

me in mine

has to be serviced and maintained below ground and so there is a very impressive workshop

workshop-1 (Medium)

workshop-2 (Large)

I travelled 7km below the surface during my trip and one of the things I found most surprising was just how hot it was lower down.  I only had a t-shirt on under my high-vis. jacket but I was sweating a lot.  There are a complex system of fans and pipes which provide fresh air and remove stale air.

The explosive used when development drilling is a water resistant emulsion, which is pumped into pre drilled holes through a plastic hose.   A scaling truck mounted with a hammer drill is used to remove loose rock after the explosion.  Reinforcing bolts are grouted in 27mm holes  to support the rock and shotcrete (a 3-5cm thick support layer) is sprayed over the hole rock surface.

In production drilling the charging holes are filled with kimlux a bulk emulsion explosive.  The charging operation is automatic once the hose is in the hole.

You can read more about the whole process here; http://www.lkab.com/?openform&id=443A

Many thanks to LKAB for allowing me to visit the mine and to Ingvar, Kjell, Veronica and Ann-Sofia for making my tour very enjoyable.

One for Merete – Part 3

Stinging nettles (Urtica dioica) are also starting to appear in reasonable quantities.

In spring when the leaves are young, if you grasp them confidently and roll between your fingers, you can remove the stings without getting stung and eat the leaves raw. They make a pleasant snack.

I like to gather lots of nettle leaves, place them in a small amount of water, add vegetable stock granules and pieces of spicy sausage and boil to make a simple soup.

People are always skeptical about the cooking process breaking down the stings, but it really does. I really enjoy nettle soup!

Nettles are a rich source of minerals (especially Iron) and vitamins (especially vitamin c). They have been used in the treatment of skin complaints and rheumatism and internally are good for the kidneys and circulation.

The outer stem of this plant can be utilised to make fine cloth and can be used to make a strong cordage. The word “net”, as in fishing net is derived from the word “nettle” as nettle cordage was used to make fishing nets.

I have found that the juice from inside the plant, counteracts the effect of the stings.