Coeur d'Alene's (CDE -5.3%) Q1 net income tripled but fell short of estimates, sending shares lower. Average realized prices fell 7% per silver oz. and 4% per gold oz. Silver output slid 22% to 3.8M oz. due to lower-grade ore mined at Palmarejo in Mexico, CDE's biggest mine by production. Expects operating costs per silver oz. to increase to $9.50-$10.50 this year from $8.00-$9.00 it had forecast earlier.