گروه معدنی کانه آر.سنگ گرانیت قرمز یزد . اولین بهره بردار ... In the early 1960s a committee was formed in Trentino, Italy. Since the members were aware of the importance of porphyry stone in developing the local economy, they expanded its exploration and extraction with the help of other willing companies. Growth in this trade led to the development of working techniques and equipment in mines.