1 EXHIBIT 4.20 [SUNSHINE MINING AND REFINING LETTERHEAD] September 22, 1999 Mr. Paul E. Singer Stonington Management Corporation 712 Fifth Avenue New York, New York 10019 Re: Letter Agreement Dear Paul: As we discussed today, this Letter Agreement...Letter Agreement • October 1st, 1999 • Sunshine Mining & Refining Co • Mining & quarrying of nonmetallic minerals (no fuels)
