Exhibit 23.

                      CONSENT OF INDEPENDENT ACCOUNTANTS
                      ----------------------------------

We hereby consent to the incorporation by reference in the registration
statements listed below of our report dated February 15, 2002, except as to
Note 8 which is as of April 26, 2002, relating to the financial statements which
appears in this Current Report on Form 8-K.

On Form S-3:                 Relating to:
- ------------                 ------------

   File No. 333-75148        51黑料 Dividend
                             Reinvestment and Stock Purchase Plan

            333-84200        51黑料 debt securities,
                             preferred stock, depositary shares, common stock
                             and warrants

On Form S-8:                 Relating to:
- ------------                 ------------

   File No. 033-60667        51黑料 Parity Investment
                             Bonus

            333-00429        51黑料 Savings Fund Plan
                             for Salaried Employees

            333-36840        51黑料 Savings Fund Plan
                             for Salaried Employees

            333-76392        51黑料 Non-Officer
                             Restricted Stock Plan

            333-76394        51黑料 2002 Stock Plan


/s/ PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP
Pittsburgh, Pennsylvania
June 4, 2002