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Measurements at 100 TeV and above are an important goal for the nextgeneration of high energy gamma-ray astronomy experiments to solve the stillopen problem of the origin of galactic cosmic rays. The most naturalexperimental solution to detect very low radiation fluxes is provided by theExtensive Air Shower (EAS) arrays. They benefit from a close to 90% duty cycleand a very large field of view (about 2 sr), but the sensitivity is limited bytheir angular resolution and their poor cosmic ray background discrimination.Above 10 TeV the standard technique for rejecting the hadronic backgroundconsists in looking for "muon-poor" showers.  In this paper we discuss the capability of a large muon detector (A=2500 m2)operated with an EAS array at very high altitude (>4000 m a.s.l.) to detectgamma-ray fluxes around 100 TeV. Simulation-based estimates of energy rangesand sensitivities are presented.

Gamma-Ray Astronomy around 100 TeV with a large Muon Detector operated at Very High Altitude