Deep beneath our feet, a story of salt and toil sleeps. Here at Schacht Ronnenberg, we stand on a ground rich with history. It is a story of ambition and the hard work of miners. This is the tale of Kaliwerk Ronnenberg.
Imagine Ronnenberg many years ago. The late 19th century saw a rush to tap into the Benther Salzstock. This is a massive salt deposit stretching for eight kilometers. It runs from Weetzen to Hanover.
The Alkaliwerke Ronnenberg AG began digging Schacht Albert in 1898. They sought high-quality potash salts. Initial findings promised salts with a 37 to 89 percent potassium chloride content.
But fate tested their resolve. Several water intrusions hampered construction. Schacht Albert repeatedly flooded. Powerful pumps worked tirelessly to manage water inflow. It reached up to 20 cubic meters per minute. The constant pumping dried up numerous wells in Ronnenberg.
After nearly eight years of struggle, the Ronnenberg plant began production on December 6, 1905. The facility included a hoisting engine. It also had a boiler house, salt sheds, and loading facilities. These were erected during the shaft sinking.
The Kaliwerk Ronnenberg grew by acquiring neighboring mines. These included Kaliwerke Benthe AG and Gewerkschaft Deutschland. Production rose to about 225000 tons in 1927.
The Kali Chemie AG took over Alkaliwerke Ronnenberg in 1928. Technical improvements in the 1960s boosted output. Production reached 840000 tons in 1974. This happened even as the workforce shrank to 400.
The work in the potash mine was hard. In the early 20th century, miners did much by hand. They shoveled the mined potash salt into mine cars. A miner had to fill 12 to 15 cars per shift. Each car held 800 liters.
But nature had other plans. Water incursions had always been a problem. A major one forced the mine’s closure. In the summer of 1975, about seven million cubic meters of brine flooded the mine.
This caused over 800 building damages. It also caused ground subsidence. The damage spread across a 25 square kilometer area. Sinkholes appeared. For safety, the mine was flooded. It was abandoned by the end of 1975.
Today, little remains of the once-thriving Kaliwerk Ronnenberg. The mine buildings are gone. A residential area stands in their place. Some miner settlements remain. They serve as a reminder of the past.
The small spoil tip at Schacht Deutschland was removed. It was used to fill cavities in the Asse mine. A remnant of the tip remains. A seven kilometer brine pipe still drains it.
The story of Schacht Ronnenberg is a story of ambition. It is about hard work and nature’s power. It reminds us of Ronnenberg’s industrial past. It also shows how nature can reclaim what was once hers.