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Publicatie Laka-bibliotheek:
The Konrad Repository project. From iron ore mine to a repository for radioactive wastes (1994)

Auteur	Bundesamt für Strahlenschutz
Datum	1994
Classificatie	2.01.8.31/07 (DUITSLAND - SCHACHT KONRAD)
Voorkant

1. Introduction

The first town settlers in the Salzgitter area were attracted by a natural salt spring 
known for two millenia. The fertile soil, plentiful spring water, vital salt deposits 
and the presence of all the other raw materials necessary for human existence - as 
well as the desired "iron stones" - convinced human settlers to stay on here. Mining 
thus enjoys a long tradition in Salzgitter.

Iron ore deposits have been the basis of industrialisation in the Salzgitter area since 
the 19th century. Mineable outcroppings of iron ores were found in three different 
areas (Fig. 1). These deposits date back to the Upper and Lower Cretaceous period, 
i. e. they are 136 to 65 million years old. The iron ore was mined in open pit mining
as well as in deep mining. Ore was first mined in 1867 in the "Finkenkuhle" pit near 
Salzgitter-Ringelheim. The last pit to operate in this area was the Haverlahwiese 
mine, where mining was stopped in June of 1982. Iron ore deposits had been known 
to exist here since 1837. Here as well, ore mining began at the surface. The first drifts 
were advanced in 1845. Open pit workings were suspended here in October of 1967.

The Konrad mine is the most recently opened one of the iron ore mines in the
Salzgitter area (Fig. 2). The deposit here differs considerably from those of the other 
sites mentioned. The iron ore horizon exposed by the Konrad mine was deposited in 
the Upper Jurassic period about 150 million years ago. The extensive iron ore deposit 
is part of a system of rim synclines around salt domes, their ore-bearing part extends 
for about 60 km from Salzgitter-Hallendorf into the Vorhop area north of Gifhorn 
and is 8 to 15 km wide. This ore deposit does not reach the surface at any point and 
is exposed by the Konrad mine at a depth of between about 800 and 1 ,300 m.

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