B757 FLT CREW REPORTS LEFT ENGINE FAILURE PASSING 10000 FEET ON CLIMB OUT. EMERGENCY IS DECLARED AND THE FLIGHT IS SAFELY RETURNED TO THE DEPARTURE ARPT.

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ARRIVED ZZZ OPS UNEVENTFUL FLT PLANNING. BOTH CAPT AND MYSELF NOTE L ENG REVERSER DEFERRED INOP WITH HISTORY OF STATUS MESSAGES ASSOCIATED WITH L ENG REVERSER. UNEVENTFUL PUSHBACK; ENG START; TAXI AND TKOF. DURING CLB PASSING 10000 FT MSL; SINGLE AUDIBLE BOOM ACCOMPANIED WITH ACFT YAW TO THE L. I LOOK DOWN AT UPPER EICAS SCREEN AND ANNOUNCE 'ENG FAILURE L ENG.' CAPT IS HAND-FLYING THE ACFT; LOWERS THE NOSE AND CTLS THE YAW. CAPT CALLS FOR ME TO DO THE QRC AND HE THEN TAKES THE COM WITH ATC AND INFORMS DEP THAT WE HAVE HAD AN ENG FAILURE AND ARE RETURNING TO ZZZ. THE CAPT AND I DISCUSS THE ENG INDICATIONS EPR 0; N1 0; N2 0; NORMAL OIL QUANTITY; NO OIL PRESSURE. WITH THESE INDICATIONS AND OUR PERCEIVED PHYSICAL INDICATIONS WE AGREED THAT THE ENG APPEARED TO HAVE SEIZED. I RAN THE QRC FOR L ENG SEVERE DAMAGE/SEPARATION AND ASSOCIATED REF ACTION FROM THE FLT MANUAL. THE CAPT INFORMS ME TO SEND OUR DISPATCHER AN ACARS MESSAGE OF OUR SITUATION AND OUR INTENTIONS TO RETURN TO ZZZ WHICH I DID AND THEY ACKNOWLEDGED. CAPT INFORMED THE PURSER OF OUR SITUATION AND OUR INTENTION TO RETURN AND NOTIFIED THEM THAT WE EXPECTED A NORMAL LNDG. WE SET UP AND THE CAPT BRIEFED A SINGLE ENG APCH BACKED UP BY THE ILS ZZZ. I CHKED THE LNDG DISTANCE FOR OUR ABNORMAL CONFIGN AND EXPECTED LNDG WT AND THE DISTANCE REQUIRED WAS APPROX 4000 FT WITH 11000 FT AVAILABLE. WE DISCUSS OUR OVERWT SITUATION AND THE CAPT'S INTENTION TO LAND WITH MINIMAL SINK RATE AND AUTOBRAKE #2. CAPT MADE A NICE APCH AND LNDG. TOUCHDOWN WAS SMOOTH AND HE LET THE ACFT ROLL OUT USING R REVERSER AND AUTOBRAKES. CAPT EXITED THE RWY AT TXWY C APPROX 10000 FT DOWN THE RWY. CRASH CREW WAS WAITING AND CHKED THE ACFT AND BRAKES. THEY RPTED THE BRAKE TEMP WAS APPROX 200 DEGS AND THAT THE L ENG APPEARED NORMAL. WE RETURNED THE ACFT TO THE GATE AND ACCOMPLISHED NORMAL SHUTDOWN PROCS. CAPT DID A FINE JOB COMMUNICATING HIS INTENTIONS AND FLYING THE ACFT.