From the Manufacturer:
Vitabase Colloidal Minerals can provide many of the vital minerals and trace minerals your body needs. These minerals come from Humic Shale found in Utah. Humic Shale deposits were first found by a rancher in 1925. Humic Shale contains the remains of an ancient rain forest. The shale is water processed to release the beneficial minerals. A micron-filter process removes harmful levels of all major heavy metals leaving just the beneficial minerals.