Altmühltaler Kalksteine e.V.

Quarrying and Processing of Jura Limestone

For the most part, the methods used in mining Jura Limestone as stone blocks have remained the same for the past hundred years. The blocks are drilled and then separated from their layers of clay. Only the tools involved that have really gone through any type of technological changes towards modernization.  The covering soil was once laboriously removed from the site by hand. Today, it is loaded and transported by high powered excavators.

Located in the Bavarian Altmühltal Natural Park, the "Frankenalb" is the largest continuous area of natural stone excavation in Germany. The mining process is subject to strict environmental standards and is done with a great sense of ecological responsibility using naturally sustainable techniques.

After separation, the stone blocks are categorized by size and geological appearance. They are then transported to the plant where they are cut along the sides with circular saws. Diamond gang saws then cut the blocks into 1 to 4 cm thick raw slabs. The final phase are the honing and polishing lines that produce the various finishes. Any open pores that are occasionally found in the finished slabs are sealed with polyester filling material.

For interior architectural purposes, the Jura Limestone is used for flooring, wall cladding, staircases and window sills. They are generally polished or honed as well as the newest design, the so called "antique surface". Outside, the slabs are mostly in honed or sawn form and are utilized for facade cladding of solid constructions and for adding a decorative touch. Other forms of surfaces include  sand blasted, bush-hammered, rippled, striated and various brushed finishes.

CNC Fräse