MLG HAD JUST TAKEN OFF AND HAD NMAC WITH SMT APCHING IN OPPOSITE DIRECTION.

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AT GATE IN BZN; I CONTACTED BZN RADIO OR ARPT ADVISORIES. GIVEN RWY 12 WAS PREFERENTIAL RWY FOR DEP AND TOLD AN SMA DOING TOUCH AND GO'S ON RWY 30. AFTER ENG START; ADVISED FSS WE WERE TAXIING TO RWY 12. WE WERE NOT ADVISED OF ANY NEW TFC IN THE PATTERN. RECEIVED IFR CLRNC FROM SLC CENTER AND ADVISED THEM OF INTENDED RWY OF DEP. AFTER VISUALLY CLRING THE TFC PATTERN AND OBSERVING THE SMA TURNING XWIND FOR RWY 30. I MADE AN ADVISORY CALL ON BZN FSS 123.65 OF OUR INTENT TO 'TAKE RWY 12 FOR DEP.' MIDWAY INTO OUR TKOF WE HEARD AN SMT ANNOUNCE A GO AROUND SINCE HE WAS ON FINAL FOR THE OPP RWY (30) WE WERE ABOVE 100 KTS AT THIS POINT AND WHEN HE TURNED ON HIS LNDG LIGHTS; WE OBSERVED HIM TO BE ON A 3-5 MI FINAL. HE STARTED A RIGHT TURN TO THE N. THIS WAS THE FIRST WE WERE AWARE OF HIS POS OR PRESENCE. HE NEVER ACKNOWLEDGED HIS POS WHEN I MADE THE DEP CALL ON FSS FREQ. THE SMT DID NOT CLR THE RWY COURSE--INSTEAD HE PARALLELED RWY 30 BTWN 100-200' TO THE RIGHT OR N. WHEN WE BECAME AIRBORNE; THE SMT PASSED OUR ALT 100-200' OFF OUR LEFT WIND AND NEVER ATTEMPTED TO CLB TO CLR THE RWY AREA. SINCE HE ANNOUNCED A GO AROUND IN A SEE AND BE SEEN ATMOSPHERE; IT WAS HIS RESPONSIBILITY TO ADEQUATELY CLR THE CONFLICT. WE WERE VERY CLOSE TO THE GND AND THE GEAR HAD NOT BEEN RETRACTED. I FEEL THE INCIDENT OCCURRED BECAUSE: 1) THE SMT FAILED TO ADVISE US OF HIS POS AND INTENTION TO LAND ON THE OPP RWY (NON PREFERENTIAL RWY). 2) HE FAILED TO ADEQUATELY COMPLETE A GO AROUND WHICH HE ANNOUNCED; THEREFORE NOT CLRING THE DEP COURSE. 3) LACK OF USING LNDG LIGHTS IN TFC PATTERN MADE IT IMPOSSIBLE FOR HIM TO BE SEEN DUE TO SIZE OF ACFT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: THE WIND WAS 200/03 AN THERE WAS NO GOOD REASON WHY THE SMA WAS SHOOTING TOUCH AND GO'S ON OTHER THAN THE PREFERENTIAL RWY. ALL PLTS FAMILIAR WITH BZN KNOW THAT THE NORMAL DEP RWY; WIND PERMITTING; IS 12. THE SMT INVOLVED IS EXTREMELY HARD TO SEE NOSE ON. IT PRESENTS A VERY SMALL TARGET. THE MLG DID NOT EVADE BECAUSE IT WAS NOT ABSOLUTELY NECESSARY AND THEY WERE TOO LOW TO MANEUVER SAFELY. THE RPTR IS A HIGH TIME PLT AND VERY FAMILIAR WITH PROCS FOR FLYING IN AND OUT OF UNCTLED ARPTS.