  Consider an $m$-dimensional area minimizing mod$(2Q)$ current $T$, with
$Q\in\mathbb{N}$, inside a sufficiently regular Riemannian manifold of
dimension $m + 1$. We show that the set of singular density-$Q$ points with a
flat tangent cone is countably $(m-2)$-rectifiable and has locally finite
$(m-2)$-dimensional upper Minkowski content. This complements the thorough
structural analysis of the singularities of area-minimizing hypersurfaces
modulo $p$ that has been completed in the series of works of De
Lellis-Hirsch-Marchese-Stuvard and De Lellis-Hirsch-Marchese-Stuvard-Spolaor,
and the work of Minter-Wickramasekera.
