 Tin was first discovered on the mountain in 1937.The focus of exploration over the years has shifted from tin-base metals to porphyry tungsten-molybdenum-bismuth deposits, and then to porphyry tin deposits, and now indium, a rare element that is important to new technologies such as LCD screens and solar cells, computers and smart phones.The Mount Pleasant mine is located south of Fredericton, the provincial capital.