sentences:  Besides panning and other gold-washing machines, efforts shifted to working the lode deposits, or gold-bearing quartz vein mining.This involved digging shafts and tunnels, from three to seven square feet in size, braced by timbers due to the fissures in the rock and the danger of collapse.Most mines stayed above the water table, being no more than thirty feet deep, such as the Allatoona Mine in Bartow County.