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Start from the car park opposite the bridge over the Oiartzun Ibaia stream.
(S/E) Heading towards the mines, take the path leading up to the left, which takes you back to the cycle path.
(1) When you reach the cycle path, turn right and follow it upwards. Further on, at the small building on your left, you'll see the Three Crowns in front of you: Irumugarrieta, Txurrumurru and Erroilbide peaks. A few metres further on, you'll reach the entrance to the Arditurri mines.
(2) Take the concrete ramp up on your left, then after 20 m take the gravel path up on your left. Keep to the left until you reach a staircase made of earth and wood, which leads to a retention basin. Continue to the footbridge and cross the undergrowth. Cross the stream. Stay on the main path and continue straight ahead until you reach the Arditurri stream.
(3) Take the left-hand path. Cross the forest and continue on the gravel path. At the next junction, turn right and continue along the path until you cross a stream.
Continue for around 500 metres and take the gullied path down to the right (be careful, it's a tricky descent) to reach the "Unaileku" border, where you can picnic or take a break on a pleasant moss carpet below.
(4) Continue South to the next intersection, follow the white and yellow signs (PR®-GI1009) towards Sorotxo.
Cross the numerous streams to the ridge separating Arluxe from Ezurmendi.
(5) Turn left. A few metres further on, you'll see some iron rocks. Continue along the path, where you'll often see the Bay of San Sebastian in the distance, and the open-cast mines below. Rejoin the Gl3420 road.
(6) Take the right-hand path, marked White and Yellow, towards Olaetxe. At the next intersection, continue straight ahead. At the next intersection, keep right (white and yellow markings).
(7) This part is a tricky descent, as it is very stony and slippery. After crossing the undergrowth, rejoin the Gl3420 road.
(8) The last part of the hike is on the road. Keep to the right-hand side of the road (as visibility on the left-hand side is very poor for motorists).
(E) After 200 m, take the right-hand road, cross the bridge and arrive at the start car park (S/E).
