...Erin Brockovich...added her weight this week to a possible class action suit against mining giant Alcoa in Western Australia state...In the tiny town of Yarloop...local residents have complained of health problems they blame on emissions from the nearby Alcoa bauxite refinery...Alcoa said the company's Wagerup refinery had been tested independently and found to be safe. "Wagerup refinery meets the most stringent health and environmental standards in the world," the company said...Yarloop residents told Brockovich they believed the Alcoa mine was causing breathing problems, skin irritation, chronic fatigue, mental problems, nosebleeds and even cancer...[also refers to Pacific Gas]