PHOENIX — Hopis and Navajos who work at a coal mine near the Arizona-Utah border said Tuesday their family lives and earning power will suffer greatly if the power plant fed by the mine is shuttered as planned. The Navajo Generating Station in Page is set to close at the end of 2019 unless a new owner can be found. That’s considered a long-shot, but the company that owns the supply mine says it has identified investors interested in one of the largest coal plants in the West. More than 200 workers, their family members and supporters in blue T-shirts,...