There were mines of chrome, mercury, sulphur, cinnabar, argentiferous lead and rock salt. Ore minerals included cerargyrite, native silver, polybasite, and argentiferous galena. Two companies mined for argentiferous galena, a source of silver. The mineral occurs in metalliferous veins with calcite, argentiferous galena, native silver, native arsenic, &c. Mercury, copper, sulphur, arsenic, argentiferous lead, iron, coal, etc. These argentiferous galenas have long been an important ore of silver. The argentiferous lead was initially worked immediately in the German tests on lightened silver.