UNAUTH RWY USE OP. LNDG ON RWY NOT AUTHORIZED BY OP SPECS.

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DSNDING FOR APCH TO ALW; APCH CTL ADVISED GS FOR RWY 20 OTS. APCH CTL ASSIGNED VOR 16 VIA RADAR VECTORS. CAPT BRIEFED CIRCLE TO LAND MINUTES FOR RWY 20. INSIDE FAF; TWR RPTED OTHER ACFT SAW RWY 16 AT MINIMUMS AND 1 DME; AND LANDED RWY 16. FO MADE STANDARD CALLOUTS BASED ON ST. IN 16 RATHER THAN CIRCLE TO LAND 20. AT ST. IN MINIMA FOR 16 AND AT 1 DME FO SAW RWY 16. FO QUERIED TWR FOR LNDG CLRNC AND TWR CLRED US TO LAND RWY 16. NOT UNTIL WE TALKED TO GND CTL ABOUT WHY WE DIDN'T GET LOC ONLY APCH RWY 20 DID THEY MENTION 'RWY 16 NOT AUTHORIZED FOR YOUR SIZE ACFT.' GND THEN ADVISED IT WAS A TECHNICALITY NOT TO BE ABLE TO SUE RWY 16 DUE TO LACK OF RWY LIGHTS. THEN HE SAID; 'OH; WELL IT WAS OPERATIONALLY NECESSARY FOR YOU TO USE IT (RWY 16).' I (FO) BELIEVE ATC LED ME DOWN THE PRIMROSE PATH BY EVEN MENTIONING RWY 16. HAD THEY NOT MENTIONED IT; WE WOULD HAVE DONE WHAT WE BRIEFED (CIRCLE 20); REMAINED IML (CIRCLE TO LAND MINIMA WAS 140 FT HIGHER); GONE MISSED APCH AND DIVERTED. TWRS COMMENTS ABOUT RWY 16 AND ST IN MINIMUMS CAUSED ME TO BLANK OUT ON THE USE OF THE CIRCLING MDA. HOWEVER; FROM NOW ON I WILL ALWAYS READ EVERY NOTE AND BLACK BALLED ITEM IN THE NOTE SECTION ON THE ARPT DIAGRAM BEFORE EVERY LNDG...EVEN IF I'VE BEEN THERE HUNDREDS OF TIMES BEFORE. ALSO; IF ATC KNEW WE WEREN'T AUTHORIZED ON RWY 16; WHY DID THEY CLR US TO LAND ON IT? I KNOW IT'S MY UNINTENTIONAL FAULT FOR USING THE WRONG MDA; THE ONLY CORRECTIVE ACTION I CAN THINK OF IS TO MAINTAIN HIGHER VIGILANCE. OTHER CONTRIBUTING FACTORS: I ATOGS (TKOF AND LNDG DATA) SHOWED US ABLE TO USE RWY 16. INSTRUCTOR APCH PLATE HAD NO NOTE ON IT: TRIP WAS THE 2ND REDUCED REST TRIP THAT WK (8 PLUS 05 ON GND): TWR KNEW WE WERE NOT AUTHORIZED; BUT DIDN'T SAY ANYTHING PRIOR TO LNDG. SUPPLEMENTAL INFO FROM ACN 271840: THEY THEN TOLD US THAT RWY 16 IS NOT AVAILABLE FOR OUR AIRLINE AND ACFT TYPE DUE TO RWY LIGHTS. WE THEN LOOKED AT THE ARPT DIAGRAM ON A DIFFERENT APCH PLATE. GND CTL WAS RIGHT. THERE WAS A NOTE SAYING RWY 16/34 NA FOR OUR TYPE ACFT.