  We study bino-wino coannihilation scenario in the so-called spread or
mini-split supersymmetry. We show that, in this model, a neutral wino has a
macroscopic decay length in a wide range of parameter space. This
characteristic feature could be observed as a displaced vertex plus missing
transverse energy event at the LHC. In this paper, we study the current
constraints and future prospects on the scenario based on the displaced vertex
search performed by the ATLAS collaboration. It is found that a sizable
parameter region can be probed at the 8 TeV LHC run. This search strategy will
considerably extend its reach at the next stage of the LHC running, and thus
play a crucial role to examine a possibility of bino dark matter in the
mini-split type supersymmetric models.
