In October 2015, the leaders of unions of the Rio Tinto Global Union Network...demanded that the company limit precarious work and improve the working conditions of its precarious workers. Precarious labor includes temporary, casual and contracted-out work that generally has poorer wages and working conditions, less job security, fewer social protections and lower health and safety standards than regular, direct employment. Rio Tinto appears to be increasingly using precarious labor around the world, a threat to workers, their unions and their communities. Unions have attempted to raise this issue with the company but Rio Tinto’s response has been inadequate. We are therefore reaching out to investors to engage the company. We believe these issues are of concern to investors for a number of reasons..