Igneous intrusions beneath volcanoes are where magmas develop the characteristics that help determine the nature of volcanic eruptions. In this study, we look at one aspect of this process; namely, how the redistribution of liquid and crystals in one shallow intrusion contributed to the formation and concentration of silica-rich melts. We use microscopic analyses of thin sections of rock to determine the distribution of late-stage melts within the crystal pile and to identify evidence for the exsolution of volatiles. We also use micro-analytical techniques to determine the chemical compositions of millimeter-scale veins and pools of silica-rich melt in these rocks. We conclude that the migration and concentration of silica-rich melts was a multi-stage process that involved the compaction of crystals carried in with the magma and the later exsolution of volitiles which created bubbles in the residual melt. Melts continued to evolve chemically in spaces between minerals after most of the silica-rich liquid was expelled, but these last liquids remained trapped within the rigid network of crystals.