CLOSE PROX ACR-LGT GA-SMA. LGT WAS BEING VECTORED FOR ILS APCH AND SMA OPERATING VFR NEAR ARSA.

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WE WERE ON A RADAR VECTORED DOWNWIND LEG TO ILS 34L AT KSLC APPROX 1000' ABOVE A SOLID UNDERCAST; DUSK; GOOD VISUAL CONDITIONS; 190K IAS. WE HAD JUST GONE PAST SLC #2 ARPT WHEN GIVEN TFC AT 10 O'CLOCK; 3 MI; ALT UNKNOWN. KSLC HAD BEEN BELOW MINIMUMS BUT SEEDING WAS IN PROGRESS; RVR WAS UP TO 3000' AND WE WERE CONCENTRATING ON UPCOMING VERY LOW VIS APCH. LOOKED FOR TFC BUT NO JOY. WE WERE GIVEN 90 DEG LEFT TURN TO BASE; DES FROM 7000' TO 6500'. MADE TURN (TOWARDS MOUNTAINS; SAW LIGHT; THOUGHT IT WAS ON GND; IE MOUNTAINSIDE RISING FROM LOW CLOUDS. THEN; SLIGHT MOVEMENT BECAME APPARENT. THEN GIVEN HDG 010 DEGS; CLRD FOR APCH. TURN AT FIRST LOOKED LIKE IT WOULD INCREASE CLRNC; PROBABLY BECAUSE OF APPARENT MOVEMENT OF ACFT ON WINDSHIELD CAUSED BY BANKING; LEVELING. LITTLE OR NO MOVEMENT NOW VISIBLE SO BANK WAS STEEPENED AND DES CONTINUED TO 6300' TO AVOID NOW RAPIDLY ENLARGING AIRPLANE LIGHTS. ACFT WENT BY APPROX 200' ABOVE AND 500' TO OUR RIGHT HDG SW. IT WAS A HIGH WIND SINGLE ENG; ALMOST CERTAINLY AN SMA. HE TOOK NO EVASIVE ACTION. WE WERE AN LGT WITH ALL NAV LIGHTS; ANTI-COLLISION LIGHTS AND LNDG LIGHT ILLUMINATED. WE RPTED SITUATION TO SLC APCH; BUT THEY MADE NO RESPONSE. BY THIS TIME WE HAD OVERSHOT FINAL SO WE CORRECTED AND CONCENTRATED ON APCH. MISSED AT MINIMUMS BECAUSE NO CONTACT. G/S; LOC AND IAS WERE WIRED. GOT IN ON NEXT APCH; BUT JUST BARELY. ACFT #2 MAY HAVE BEEN LEGAL AS WE WERE JUST S OF ARSA LIMIT; BUT IN MY OPINION FLT OVER 100' CEILING IN SINGLE ENG; THROUGH EXTENDED FINAL OF MAJOR ARPT; IN AREA COMPRESSED BY VERY HIGH TERRAIN AND WITH NO RADIO CONTACT WAS EXTREMELY POOR JUDGEMENT. I BELIEVE A TCA IS OVERDUE FOR KSLC TO PROTECT US FROM THOSE WHO WON'T PROTECT THEMSELVES. A TCA IS NOT INFALLIBLE; BUT IT'S A LOT BETTER THAN OPEN SEASON ON THE NOT SO WIDE OPEN SKIES.