Best thing to do is to take an airplane flight over the Fderik Mines to take a close look at the strange Image that is depicted from any Satellite.
Mauritania has extensive deposits of iron ore, which account for almost 50% of total exports. To carry th iron of the mines to the coast and export it, theres a huge train (biggest train in the world, please check my Mauritania Page for more info) that can reach 2km long. There are 3 trains a day.
thses are a very beautiful mountains right before you get to Fderik. Their blue colour makes it very unusual to see. After these mountains come the red iron mountains near Fderik and Zouerat.
The train from Nouadhibou to Choum-Fderik-Zouerat is the longest train in the world.
The iron ore train carry thousands of tons of crusehed rock in a chain of wagons up to three kilometres long. Their schecules and frequencies depend partly on the speed of the extraction at the mines, and on unpredictable hold-ups-damaged rails, enginefailure and even in the past, attacks by Polisario guerillas from over the border in Western Sahara-and travellers should realize that ore is the priority, not passangers.
There are 3 trains a day.
It is 460km/12hrs from Nouadhibou to Choum and more 8 hours to Fderik,and you can follow the distance on milestones along the track.
Motorists who are heading from NDB to Atar, or Choum NDBcan load their car onto opened platforms, althogh this can take days: start waiting at the railway station opposite the douanes at 9am to stand the chance of getting it loaded onto the 6pm freight train.
For further information contact SNIM, Nouadhibou BP 42 -tel 745174 ext:1700;fax 745396, the state organization that runs the iron ore mines and the railway.
The train carrying iron from Zouerate to the coast at Nouadhibou, is probably the world's longest train. Normally its length is as much as 3 kilometres. The whole journey takes around 12 hours, where almost 700 kilometres are covered. If you want to come to, or leave, Fderik, there are no good alternatives to this train. But it should not be avoided anyway.
Nowadays, normal compartments have been put up. Up until a few years ago, sitting on top of the wagons, was all offered. This is still used, but it's unpleasant. The cost of travelling is just around $5 one way (1 ougiya per kilometre.)