  Monolayer Graphene contains two inequivalent local minimum, valleys, located
at $K$ and $K'$ in the Brillouin zone. There has been considerable interest in
the use of these two valleys as a doublet for information processing. Herein I
propose a method to resolve valley currents spatially, using only a weak
magnetic field. Due to the trigonal warping of the valleys, a spatial offset
appears in the guiding centre co-ordinate, and is strongly enhanced due to
collimation. This can be exploited to spatially separate valley states. Based
on current experimental devices, spatial separation is possible for densities
well within current experimental limits. Using numerical simulations, I
demonstrate the spatial separation of the valley states.

Mesoscale and Nanoscale Physics