Mont Blanc massif less than 21 hours. The main mountain passes, or cols, that connect different valleys and towns around the Mont Blanc massif are: The first ascent of Mont Blanc in 1786 by Jacques Balmat and Michel Paccard initiated the sport of alpine mountaineering, and it was during the golden age of alpinism (185465) and the silver age of alpinism (186582) that the majority of the main summits of the massif were first attained. Members of the England-based Alpine Club were instrumental in many of the first ascents, usually accompanied by guides from the towns of Chamonix or Courmayeur, such as Michel
Iron Mountain (Los Angeles County) a 30° to 50° angle on loose soil, decomposed rock, or through brush. Some approaches to the summit require high degrees of rock-climbing skill. One route over the ridgeline from nearby Mount San Antonio (Mount Baldy) is long, difficult, and dangerous. The south mountain slopes in summer are directly exposed to the sun. Some climbers stay at the ruins of the Allison Mine about below the summit. There are no facilities of any kind on the mountain. Iron Mountain (Los Angeles County) Iron Mountain is a mountain in the San Gabriel Mountains of Los Angeles County, California. It is within