Bank of America says it will phase out financing of coal companies that predominantly use destructive mountaintop removal mining practices, citing concern for the environment. But the policy, buried in the company's Web site this week and barely acknowledged by its public relations department, may be little more than show...[However]...the "precedent-setting nature" that worries [Chris] Hamilton [vice president of the West Virginia Coal Association] is what makes the policy potentially powerful, said Dan Bakal, director of electric power programs with Ceres...Securities and Exchange Commission filings show Bank of America participates in loans to seven major companies involved in mountaintop mining: Massey Energy Co., Alpha Natural Resources, International Coal Group, Foundation Coal Holdings, Arch Coal, Consol Energy and Patriot Coal Corp.