ORDERED that the order is affirmed insofar as appealed from, with one bill of costs.
The Supreme Court properly denied the appellant's motion for summary judgment on the ground that it was not negligent in the happening of the accident. The vague and conclusory assertions in the affidavits of the appellant's president were insufficient to make a prima facie showing that the appellant did not leave a bag from which sand-like material had spilled on the floor causing the plaintiff to slip and fall at a site where it had performed construction work (see, Ayotte v. Gervasio, 81 N.Y.2d 1062; Winegrad v. New York Univ. Med. Center, 64 N.Y.2d 851).
Furthermore, the other parties established that they have not had an adequate opportunity to conduct discovery into several relevant issues, some of which are exclusively within the knowledge of the appellant (see, CPLR 3212[f]; Firesearch Corp. v. Micro Computer Controls Corp., 240 A.D.2d 365; Urcan v. Cocarelli, 234 A.D.2d 537; Halpern Dev. Venture v. Board of Trustees of Vil of N. Tarrytown, 222 A.D.2d 652).
SANTUCCI, J.P., ALTMAN, FLORIO, H. MILLER and COZIER, JJ., concur.