Building worthiness (mining)
In mining and economic geology, the economic recoverability of a raw material deposit is referred to as building worthiness (less often mining worthiness ) .
“Another aspect is brought into the coal reserve calculation through the concept of building worthiness. A deposit is worth building if it is economically feasible to mine it, i. H. if the capital tied to the company pays appropriate interest. "
If the assessment reveals the building worthiness, then the deposit becomes a deposit.
Evaluation criteria
Evaluation criteria include a .:
- Quality of the deposit (minimum, average content),
- Supply quantity,
- Upper limits for admixtures and intermediate substances,
- Development effort ,
- Costs of dismantling and extraction,
- Processing costs,
- Transport costs,
- achievable product price,
- achievable sales volume.
There can be parts of a deposit that are worth building and parts that are not worth building.
Change of building quality
If one or more evaluation criteria change, a deposit can fall below the building value limit or a deposit can be transformed into a deposit. While z. B. hard coal was the basis of German heavy industry for decades , its mining became more and more uneconomical . Here the parameters of product price and costs of mining and extraction have changed negatively. As a result, German hard coal is currently not competitive despite state subsidies, it is not worth building .
| decade | minimum Cu content in% |
|---|---|
| 1881-1890 | 5.20 |
| 1891-1900 | 3.80 |
| 1901-1910 | 2.06 |
| 1911-1920 | 1.64 |
| 1921-1930 | 1.52 |
| 1931-1940 | 1.58 |
| 1941-1950 | 0.97 |
| 1951-1961 | 0.80 |
The steadily decreasing minimum content is due to the improved extraction and processing methods, which increasingly make it possible to mine and smelt previously unworthy ores profitably.
literature
- Fritz Heise, Friedrich Herbst, Carl Hellmut Fritzsche: Mining studies . Textbook of, with special consideration of the coal mining industry. 8th and 9th completely revised edition. Springer-Verlag, Berlin / Göttingen / Heidelberg 1958.
- Walter Bischoff , Heinz Bramann: The little mining dictionary . Ed .: Westfälische Berggewerkschaftskasse Bochum. 7th edition. Verlag Glückauf GmbH, Essen 1988, ISBN 3-7739-0501-7 .
- Emil Kraume: 1000 dates Rammelsberg . Ed .: Preussag Aktiengesellschaft. Goslar.
- Ernst-Ulrich Reuther: Introduction to mining . 1st edition. Verlag Glückauf GmbH, Essen 1982, ISBN 3-7739-0390-1 .
- Collective of authors: Basic geological knowledge . Ed .: Horst Roschlau, Hans-Joachim Haberkorn. 2nd Edition. German publishing house for basic industry, Leipzig 1977, p. 119 ff .
Web links
- Building worthiness. Letter B. In: Alphabet of local history. Retrieved July 17, 2014 .
- worth building. In: Digital Dictionary of the German Language of the 20th Century (DWDS). Retrieved July 17, 2014 .
- worth building. In: Retro Bib. Retrieved July 17, 2014 .
Individual evidence
- ^ Fritz Heise, Friedrich Herbst, Carl Hellmut Fritzsche: Textbook of Mining Studies, with special consideration of hard coal mining , Springer-Verlag, Berlin / Göttingen / Heidelberg, 8th and 9th completely revised edition 1958, p. 15.
- ↑ Collective of authors: Basic Geological Knowledge . Ed .: Horst Roschlau, Hans-Joachim Haberkorn. 2nd Edition. German publishing house for basic industry, Leipzig 1977, p. 123-124 .