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1907
Establishment of the company; mining of Rhine slate in
up to 6 underground mines in the Bundenbach region.
1970
Theis-Böger was the first German company to start
importing significant amounts of slate from Spain. This imported slate soon
became very popular among architects, roof tilers and building contractors
under the protected trademark Assulo®.
1984
Re-opening of the traditional and significant Altlay
mine in the Rhenish mountains. Altlay is among the best slate-mining areas
in Germany.
1988
Establishment of the Spanish subsidiary
Theboe S.A. Own production of all sizes,
quality control and assurance in the country of origin of Assulo® slate.
Today
Slate mining at the Altlay site now takes place
underground and is thus environmentally compatible. Currently this valuable
product is being mined at a depth of approximately 120 metres. The most
modern technology is used, as developed in-house in accordance with
individual requirements. Theis-Böger's production range has been expanded
with new grades from mining sites worldwide, such as Monte Color®.
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