The Knekt shaft at Sala Silvermine, Sala, Sweden.
The Knekt (Swordsmen) shaft was initiated in 1604 and was, when it stood ready in year 1639, 148 meters deep. The shaft never reached the desired minerals, but between 1646 and 182 it was in use as the mine’s main pumping shaft. In the late 1800s the shaft was extended to 190 meters depth and in 1887 a shaft tower was built over the shaft. In 1969 this tower collapsed, but in 2003 an exact copy of it was rebuilt. Two modern elevators where installed in the same year.