  In its initial deployment, the Non-Imaging CHErenkov Array (NICHE)will
measure the flux and nuclear composition of cosmic rays from below 10^16 eV to
10^18 eV by using measurements of the amplitude and time-spread of the
air-shower Cherenkov signal to achieve a robust event-by-event measurement of
Xmax and energy. NICHE will have sufficient area and angular acceptance to have
significant overlap with TA/TALE, within which NICHE is located, to allow for
energy cross-calibration. In order to quantify NICHE's ability to measure the
cosmic ray nuclear composition, 4-component composition models were constructed
based upon a poly-gonato model of J. Hoerandel using simulated Xmax
distributions of the composite composition as a function of energy. These
composition distributions were then unfolded into individual components via an
analysis technique that included NICHE's simulated Xmax and energy resolution
performance as a function of energy as well as the effects of finite event
statistics. Details of the construction of the 4-component composition models
and NICHE's ability to determine the individual components as a function of
energy are presented.
