The purpose of the study was to determine the solubilities of specific metals under controlled conditions from mineralogically and chemically studied rocks from the Broad Quadrangle, Georgia. Distilled deionized water was circulated in a non-contaminating system through crushed granite at controlled rates and temperature for a period of several months. The solubilities of calcium and magnesium were measured in the laboratory and compared with concentrations measured in the field. These comparisons showed that the natural concentrations of calcium and magnesium are much higher than those measured in the laboratory. The absence of dissolved carbon dioxide in the laboratory water was thought to account partly for the low experimental concentrations, but not the large difference found. Colloidal and/or organo-metallic transport possible accounts for part of the discrepancy. (WRSIC abstract)