Upper Harz mining industry

Mining in the Upper Harz region of central Germany was a major industry for several centuries, especially for the production of silver, lead, copper, and, latterly, zinc as well. Great wealth was accumulated from the mining of silver from the 16th to the 19th centuries, as well as from important technical inventions. The centre of the mining industry was the group of seven Upper Harz mining towns of Clausthal, Zellerfeld, Sankt Andreasberg, Wildemann, Grund, Lautenthal und Altenau.

The Upper Harz was once one of the most important mining regions in Germany. The major products of its mines were silver, copper, lead, iron and, from the 19th century, zinc as well. The main source of income, however, was silver. From the 16th to the middle of the 19th centuries about 40–50% of the entire German silver production originated in the Upper Harz. The taxes raised from this contributed significantly to the revenue of the royal houses in Hanover and Brunswick-Wolfenbüttel and helped to secure their positions of power and influence within the empire.

Its lucrativeness justified a high commitment in terms of investment and effort. The Upper Harz mining industry produced a considerable number of innovations and inventions, including such important advances as the man engine, the water-column engine and the wire cable.

In the Upper Harz, vein mining (Gangerzbergbau) predominated. Excavation followed the almost vertically standing lodes or veins (Erzgängen) downwards. In their heyday the Upper Harz Mines were among the deepest in the world. For example, as early as 1700 or so shafts were already exceeding depths of 300 metres and, around 1830, a depth of 600 metres was achieved – which was considered significant at that time because it was below sea level.

Mining activity in the Harz goes back to the 10th and 11th centuries. The first water wheels to supply energy to the mines were constructed in the 13th century in the Pandelbach valley southeast of Seesen. At that time mining, including this early use of water systems, was carried out by the Cistercian abbey of Walkenried. At first outcropping lodes on the surface of the ground were sought out and sections of ore near the surface were dug out with hammers and chisels. Mining first boomed between 1200 and 1360. In the upper workings there were particularly rich veins of silver ore (up to 9% Ag).

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