  We numerically examine a bidisperse system of active and passive particles
coupled to a resource substrate. The active particles deplete the resource at a
fixed rate and move toward regions with higher resources, while all of the
particles interact sterically with each other. We show that at high densities,
this system exhibits a rich variety of pattern forming phases along with
directed motion or flocking as a function of the relative rates of resource
absorption and consumption as well as the active to passive particle ratio.
These include partial phase separation into rivers of active particles flowing
through passive clusters, strongly phase separated states where the active
particles induce crystallization of the passive particles, mixed jammed states,
and fluctuating mixed fluid phases. For higher resource recovery rates, we
demonstrate that the active particles can undergo motility induced phase
separation, while at high densities, there can be a coherent flock containing
only active particles or a solid mixture of active and passive particles. The
directed flocking motion typically shows a transient in which the flow switches
among different directions before settling into one direction, and there is a
critical density below which flocking does not occur. We map out the different
phases as function of system density, resource absorption and recovery
rates,and the ratio of active to passive particles.
