Silver occurred as a native phase rarely but was mainly hosted by complex antimonides and sulphosalts, dispersed in the matrices of galena and sphalerite, invisible to the naked eye but visible in microscope.

The host rock to the mined ore is dominated by white dolomitic marble, proximal to the ores commonly rich in skarn minerals such as tremolite, serpentine, diopside and chlorite, giving the dolomitic marble at Sala a characteristic green colour.

The king Gustavus Adolphus of Sweden gave the town its privileges in 1624.

Several foundations for the buildings in the mine area are built from Sala granite.

In the big empty rooms in the mine, concerts and other entertainment are arranged.

During the 18th century people searched for the second treasury, but its depth made it hard to find.

Around the old mine, cracks and erosions have caused danger for people visiting restricted areas.