Don Mario Pass
Paso Don Mario is a high mountain pass at an elevation of 4.739m (15,547ft) above the sea level, located in the Junín region, in central Peru.
The road to the summit is gravel, rocky, tippy and bumpy at times. It’s located near the Don Mario mine. Great trail for experienced wheelers. Avoid driving in this area if unpaved mountain roads aren't your strong point. 4x4 required. Stay away if you're scared of heights. Wet conditions may make for tough driving along the muddy road. Starting from the Mina Don Mario, the road climbs steeply on a difficult surface. Once above the mine however you reach a plateau, and the road climbs gently on this to the high point. The road over the pass links the Don Mario mine and the 110 road. The climb is simply terrible, with a notorius lack of oxygen that tests the organisms and a high degree of steepness. Most people feel altitude sickness at around 2,500-2,800 meters. Near the pass, oxygen is in short supply. Due its unique location and the climb in elevation over thousands of feet, and passing through remote areas, it is important when driving in these conditions to be prepared.
Pic: http://agminsacsilver.blogspot.com/2012/09/mina-don-mario.html