Search for SQM in cosmic rays at high altitude laboratories

An experiment to search for intermediate mass magnetic monopoles (105-1012 GeV/c2) and for strangelets or nuclearites in the cosmic radiation is exposed at Chacaltaya Laboratory (5230 m a.s.l.) and at Koksil, Himalaya, (4275 m a.s.l.). With the large area of nuclear track detectors (440 m2 at Chacaltaya and 100 m2 at Koksil) and the long time exposure will reach a sensitivity to the flux of SQM about 10?15 cm?2 s?1 sr?1 sr. The results of the analysis, in terms of search for SQM, of large array of detectors at Chacaltaya and exposed for more than 3.5 y are here reported.