NY -- Standard&Poor's CreditWire 3/7/96 -- Standard&Poor's assigns its single-`B'-minus-r rating to Coeur D'Alene Mines Corp.'s (CDE) proposed $125 million mandatory adjustable redeemable convertible securities (MARCS). Proceeds could be used to fund part of the construction costs for CDE's development project in Alaska or for future acquisitions. At the same time, Standard&Poor's affirms its single-`B'-plus corporate credit rating and its single-`B'-minus subordinated debt rating on the company. Also, the ratings outlook is revised to positive from stable. The ratings reflect CDE's position as a small gold and silver producer whose cash flows are highly dependent on volatile precious metals prices, and whose operations currently lack significant diversity. CDE's main operating mines in Idaho and