We have searched for long duration microlensing events originating from intermediate mass Black Holes (BH) in the halo of the Milky Way, using archival data from EROS-2 and MACHO photometric surveys towards the Large Magellanic Cloud. We combined data from these two surveys to create a common database of light curves for 14.1 million objects in LMC, covering a total duration of 10.6 years, with flux series measured through four wide passbands. We have carried out a microlensing search on these light curves, complemented by the light curves of 22.7 million objects, observed by EROS-2 only or MACHO only over about 7 years, with flux series measured through only two passbands. A likelihood analysis, taking into account LMC self lensing and Milky Way disk contributions allows us to conclude that compact objects with masses in the range 10 − 100 M (cid:12) cannot make up more than ∼ 15% of a standard halo total mass (at 95% confidence level). Our analysis sensitivity weakens for heavier objects, although we still exclude that ∼ 50% of the halo be made of ∼ 1000 M (cid:12) BHs. Combined with previous EROS results, an upper limit of ∼ 15% of the total halo mass can be obtained for the contribution of compact halo objects in the mass range 10 − 6 − 10 2 M (cid:12) .