A C172 CFI AND STUDENT EXPERIENCE AN NMAC AT THE NEWLY OPENED E95 ARPT.

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ON THE MORNING OF DEC/FRI/99; AT APPROX XA45 AM MST; A CESSNA 172 WAS INVOLVED IN AN NMAC WITH ANOTHER CESSNA 172 (UNKNOWN ACFT IDENT) DURING A TRAINING FLT AT THE BENSON MUNICIPAL ARPT (E95). DURING AN APCH TO LAND ON RWY 28 (WINDS WERE CALM); I HAD MY STUDENT INITIATE A GAR -- AS PART OF THE SYLLABUS REQUIREMENTS FOR THAT PARTICULAR LESSON. DURING THE UPWIND CLB; MY ATTN WAS INSIDE THE COCKPIT TEACHING MY STUDENT TO PROPERLY EXECUTE THE CLB WHILE 'CLEANING UP' THE ACFT. DURING OUR XWIND TURN; I LOOKED BACK TOWARDS THE RWY ONLY TO SEE A SECOND C172 APCHING TO LAND ON RWY 10. ALTHOUGH NOT 100% CERTAIN; IT IS MY BELIEF THAT THIS SECOND CESSNA ENTERED THE RWY 10 PATTERN STRAIGHT-IN FROM THE W. IT IS MY ESTIMATION THAT THE ACFT PASSED ONLY 50-100 FT BELOW US AT A HORIZ DISTANCE OF APPROX 300-400 FT. IT IS ALSO MY BELIEF THAT HAD WE NOT BEEN PRACTICING GAR PROCS; WE WOULD HAVE COLLIDED WITH THE OTHER ACFT EITHER ON THE RWY; OR DURING OUR UPWIND CLB. I BELIEVE THIS INCIDENT OCCURRED BECAUSE THE BENSON ARPT HAD ONLY RECENTLY OPENED TO THE PUBLIC; AND THE CTAF FREQ WAS; AT THE TIME; UNPUBLISHED. PRIOR TO OUR DEP; I WAS UNABLE TO FIND THE CTAF FREQ IN EITHER THE ARPT FACILITY DIRECTORY OR ON THE PHOENIX SECTIONAL. I THEN CONTACTED THE PRESCOTT FSS AND THEY INFORMED ME THAT THE CTAF FOR BENSON WAS 122.8. WHEN THIS INCIDENT OCCURRED; WE WERE MAKING ALL OF THE APPROPRIATE RADIO CALLS ON THIS FREQ. IT SHOULD BE NOTED THAT ANOTHER ACFT; A MOONEY; WAS ALSO IN THE PATTERN FOR RWY 28; MAKING APPROPRIATE RADIO CALLS ON 122.8. THE UNKNOWN CESSNA; HOWEVER; EITHER MADE NO RADIO CALLS; OR WAS XMITTING ON ANOTHER FREQ. IN EITHER CASE; SUCH A PLT IS A THREAT TO ANY AND ALL OTHER ACFT SHARING THE SAME AIRSPACE. AFTER TOUCHDOWN; THE OTHER CESSNA QUICKLY DEPARTED THE ARPT TO THE NE; AGAIN MAKING NO RADIO CALLS. I BELIEVE THIS PROB CAN BE CORRECTED BY REQUIRING ALL UNCTLED ARPTS; ESPECIALLY NEW ONES; TO PAINT THE ARPT'S NAME; IDENTIFIER; AND FREQ ON THE PARALLEL TXWY WHEN POSSIBLE. THIS WOULD ALLOW PLTS TO QUICKLY IDENT AND VERIFY THIS INFO PRIOR TO ENTERING THE TFC PATTERN. WHEN NO TFC IS PRESENT; OR WHEN WIND/RWY ADVISORIES ARE UNAVAILABLE; I TEACH MY STUDENTS TO CROSS MID-FIELD OF AN UNCTLED ARPT 500-1000 FT ABOVE TFC PATTERN ALT TO VERIFY WIND DIRECTION. THE STUDENT CAN THEN DSND AND ENTER A STANDARD TFC PATTERN AT 45 DEGS TO THE DOWNWIND. WHILE STRAIGHT-IN LNDGS ARE CONVENIENT AND ARE SOMETIMES POSSIBLE WHEN NO OTHER TFC IS PRESENT; THEY ARE DANGEROUS WHEN OTHER ACFT ARE ESTABLISHED IN THE TFC PATTERN. I ALSO BELIEVE THAT AN ARPT SHOULD NOT BE ALLOWED TO OPEN WITHOUT ARPT INFO FIRST APPEARING ON THE APPROPRIATE SECTIONAL AND/OR IN THE APPROPRIATE ARPT FACILITY DIRECTORY. I ALSO BELIEVE THAT LCL POLITICS WERE A FACTOR. I BELIEVE THAT LCL OFFICIALS WERE IN A RUSH TO OPEN THE ARPT TO KEEP PACE WITH THE RECENT OPENING OF NEARBY KARTCHNER CAVERNS.