MLG AND SMT HAVE AN NMAC IN THE ABQ ATA.

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ENTERED A VISUAL DOWNWIND FOR RWY 8 AT ABQ; FO FLYING. UPON INITIATING OUR TURN TO BASE; I CONTACTED TWR AND WAS CLRED TO LAND. I THEN SPOTTED A TARGET ON OUR TCASII ABOUT 1200 FT BELOW; ABOUT 2 MI; ABOUT 2 O'CLOCK. TWR CALLED THE TFC AND TOLD US THAT HE HAD US IN SIGHT. I TOLD TWR THAT WE DID NOT SEE HIM; BUT HAD HIM ON TCASII. STILL IN A DSNDING R TURN; THE TCASII SHOWED US CLOSING IN ON TFC. AT ABOUT 1800 FT AGL; THE FO MADE VISUAL CONTACT WITH THE TFC AND CALLED IT TO ME. I SAW HIM IN A R BANK ABOUT 500 FT BELOW AND TO THE R. THE FO IMMEDIATELY LEVELED OFF AND INITIATED A L TURN; ROLLING OUT WBOUND. I NOTIFIED TWR OF OUR MANEUVER AND ASKED ABOUT OTHER ACFT'S INTENTIONS. WE RETURNED TO ARPT AND LANDED. I CALLED THE TWR FROM THE TERMINAL AND SPOKE TO THE PERSON WORKING THE TWR DURING THE INCIDENT. HE INFORMED ME THAT THE OTHER ACFT TOOK OFF RWY 21 AND WAS TOLD TO MAKE A TIGHT R TURN TO ROLLOUT ON A HDG OF 310 DEGS. MY PERSONAL VIEW OF THIS OCCURRENCE IS THAT THIS IS A CLASSIC EXAMPLE OF COM BREAKDOWN. 1) THE SMALL TWIN ACFT MADE A WIDER TURN THAN EXPECTED BY TWR. 2) AS FAR AS I KNOW; THE TWR NEVER SUGGESTED A TIGHTER TURN TO HIM. 3) ACFT OBVIOUSLY LOST VISUAL CONTACT WITH US WITHOUT NOTIFYING TWR. 4) TWR TOOK NO ACTION TO KEEP US SEPARATED EVEN THOUGH HE SAW THE 2 ACFT CLOSING. 5) BELOW 2000 FT AGL; OUR POLICY IS TO TURN TCASII FROM TA/RA TO TA ONLY.