Presented with some of the first hard numbers on the cost of consolidating Grass Valley and Nevada City schools, the members of those districts’ respective boards voted unanimously Tuesday to continue to explore the possibility of a merger. “I haven’t seen anything that has made me not want to continue exploration,” said Frank Bennallack, a member of Grass Valley’s school board. Tuesday’s meeting was the third joint meeting since they began consolidation talks in the spring amid county-wide declining enrollment and years of budget reductions from the state. However, this meeting was the first time preliminary cost projections and a …