  Current knowledge of the relative abundances and the energy spectra of the
elemental mass groups of cosmic rays in the $10$ TeV - $1$ PeV interval is
uncertain. This situation prevents carrying out precision tests that may lead
to distinguish among the existing hypotheses on the origin and propagation of
TeV cosmic rays in the galaxy. In order to learn more about the mass
composition of these particles, we have employed HAWC data from hadron induced
air showers in order to determine the spectra of three mass groups of cosmic
rays: protons, helium and heavy nuclei with $Z > 2$. The energy spectra were
estimated by using the Gold unfolding technique on the 2D distribution of the
lateral shower age against the estimated primary energy of events with arrival
zenith angles smaller than 45 degrees. The study was carried out based on
simulations using the QGSJET-II-04 model. Results are presented for primary
cosmic-ray energies from $10$ TeV to $251$ TeV. They reveal that the
aforementioned cosmic ray spectra exhibit fine structures within the above
primary energy range.
