Pöhla-Globenstein mine
| Pöhla-Globenstein mine | |||
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| General information about the mine | |||
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| Information about the mining company | |||
| Operating company | Saxony Minerals & Exploration (SME) | ||
| Employees | 32 (as of Dec. 2018) | ||
| Start of operation | 2016 | ||
| Funded raw materials | |||
| Degradation of | |||
| Geographical location | |||
| Coordinates | 50 ° 29 '50 " N , 12 ° 48' 59.8" E | ||
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| Location | Pöhla , Globenstein | ||
| local community | Schwarzenberg / Erzgeb. , Breitenbrunn / Erzgeb. | ||
| District ( NUTS3 ) | Erzgebirgskreis | ||
| country | Free State of Saxony | ||
| Country | Germany | ||
The Pöhla Globe stone is a reconnaissance mine on tin , tungsten , and indium .
Deposit
The Pöhla-Globenstein deposit is geologically located in the western Ore Mountains part of the Fichtelgebirge - Ore Mountains anticlinal zone on the Gera-Jáchymov fault zone, which is of national importance. The Western Ore Mountains are mostly made up of crystalline slates interspersed with large granitoid plutons . The metamorphic rocks of the Lower Cambrian Raschau series of the Keilberg group, which predominantly consist of mica schists with interposed skarn metacarbonate layers, are particularly in the deposit area . The deposit extends over an area of 408 hectares from the surface of the earth to a depth of 400 m and is distributed over a total of 5 deposits. The most important ore minerals are scheelite , cassiterite and sphalerite . According to the explorations, the deposit contains approx. 43,400 t of tungsten (WO 3 ), 84,000 t of tin and approx. 1,400 t of indium. The deposit also houses around 168,500 t of fluorspar (fluorite, CaF 2 ), 996,000 t of magnetite (Mt), 241 t of silver (Ag) and 301,000 t of zinc (Zn).
history
The mining in this area can be traced back to the 17th century. Ore deposits and veins were mined relatively near the surface . In the area of the Globenstein mine field , the pits Frisch Glück Fundgrube , Hohneujahr Fundgrube , Silberschnur Fundgrube and Himmelsfürst Fundgrube built on the Skarnlager. Other pits were the New Hope Treasure Trove , the Hope of God Stollen and the Help of God Erbstolln . Mining worth mentioning has not taken place since the 19th century. The mines listed in the Saxon yearbooks for miners and smelters are permanently within deadlines , according to the Fridolin Treasure Trove between 1871 and 1932. No ore was extracted here.
Mining 1947–1988
The first research work in the area was started in 1947 by the newly founded Object 23 of Wismut AG . After object 23 was dissolved, they were continued by object 08 . In 1951, shallow prospects 17, 18, 22, 25, 26, 37, 40, 78, 94 and 98 were drilled in the area. The work was initially discontinued without any results. Only a revision carried out in 1955 led to the discovery of the Pöhla-Globenstein deposit.
From 1957 the deposit was examined with dig 24 and tunnel 19. The work was carried out by the object 01 and - after its dissolution on January 1, 1958 - by the shaft combine 235 and - after its dissolution from April 1, 1959 - by the Saxon search and prospecting expedition (SSSE). The SSSE was converted into the Saxon Geological Exploration Group (SGEG) on November 1, 1960 and placed under Object 09 .
When the exploration work carried out by the Saxon Geological Exploration Group in the Pöhla -Hämmerlein and Pöhla- Tellerhäuser area since the beginning of the 1960s brought positive results, the Pöhla exploration area was founded in 1967. The Pöhla-Globenstein partial deposit was assigned to this exploration area in the same year. Between 1957 and 1960 the deposit was investigated on 3 levels (+410 m, +350 m, +290 m). In 1957, Stolln 19 was built in the Globenstein quarry 568 m above sea level NHN ascended. A blind shaft was sunk from the bottom of the tunnel to the +410 m level and connected to the shaft 24 by a 1.6 km long crosscut . During this first period, the deposit was tested with 44 holes totaling 11,362 meters, 1916 meters of trenches and 4,422 meters of underground drills. 454.5 kg of uranium were mined. The mine building was handed over to VEB Maxhütte Unterwellenborn for further exploration of the magnetite skarn bearings found .
The work of the second scout phase 1961-1964 were on the soles m +350 and +410 m by VEB Schachtbau Nordhausen and performed the VEB Geological survey South Freiberg. Three boreholes with a total length of 2506 m were drilled and 3440 m sections were driven.
Between 1965 and 1966, 34,106 t of iron ore were mined. Due to the high arsenic and tin contents, the magnetite ores could not be used. The dismantling was stopped and the mine building was flooded.
In the third exploration phase from 1974 to 1977, the 3rd skarn deposit was examined by the SDAG Wismut on the +410 m level for tin and tungsten. After the mine had been swamped, a further 1134 m of stretches were driven; 130.6 kg of uranium were mined again. In addition, 247 holes were drilled for a total depth of 74,084 m. The mine building was then flooded again.
The fourth and final exploration phase began in 1982. The goal was again the skarn ore deposits 3 and 4 and their companion ores tin and tungsten. After the pit building had been swamped to the + 350 m level, work began. From 1984 the work was extended to the + 410 m level and the + 315 m level was also driven. 6802 m of routes were driven and 4136 t of tin ore and 8079 t of tungsten ore were extracted in the test mining. Through 1988, 139 holes were drilled for a total depth of 24,594 meters. After the completion of the investigation work in 1988, the pit was flooded and kept.
Mineralization
5 ore deposits are maintained in the deposit.
The ore deposits 1 and 2, which are thin and only exist over a short stretch, are between +250 and +320 m. They have been drilled and show a metal content of 3750 t tin and 1160 t tungsten (warehouse 1) and 1380 t tin (warehouse 2).
The third skarn horizon was examined mainly on the +410 m level. The thickness varies between 4 and 10 m. The thickness of the ore body is on average 2 to 6 m and reaches a maximum of 10 to 15 m. The main mineralization consists of cassiterite. The metal content is 30,700 tons of tin and 1,900 tons of tungsten. The Frisch Glück pit built on the outskirts of the camp .
The 4th skarn horizon was examined on all levels. The thickness varies between 30 and 50 m. Several ore bodies are embedded. Magnetite ores were mined here in 1965/66 on the +410 m level, 400 m west of mine shaft 24. The mineralization consists of cassiterite, magnetite, sphalerite, scheelite and fluorite. Scheelite is the predominant tungsten mineral with 80%. The metal content of the store is 48,160 tons of tin and 35,060 tons of tungsten. The Hohneujahr mine was built on the outskirts of the camp .
The 5th skarn horizon was discovered in 1974/78 and subsequently drilled. There are no underground excavations. The thickness varies between 20 and 50 m. The mineralization consists of scheelite and fluorite. Scheelite is the predominant tungsten mineral with 90%. The metal content of the store is 5300 tons of tungsten. Fridolin built the pit at the outcrop of the camp .
In addition to the main ores tin and tungsten, the deposit contains other raw materials. In addition to the main minerals magnetite, sphalerite and fluorite, it also contains other elements in significant quantities. These include copper, cadmium, indium, silver, bismuth, boron, and beryllium.
New start in 2006
Due to the rise in raw material prices, the extraction of raw materials became economically interesting. New processes are to be developed in Freiberg for processing the ores from the complicated skarn deposit in order to enable the economic and ecological mining of this deposit. In 2006, Wisutec received an exploration permit from the Saxon Mining Authority to re-explore the tungsten mineralization in Globenstein, which was revoked after three years, in 2010, due to inactivity of the company. In May 2012, the Saxon Mining Authority granted Saxony Minerals & Exploration AG (SME) from Halsbrücke a permit in accordance with Section 8 of the Federal Mining Act (BBergG) for the extraction of tin and tungsten , which is valid for 26 years (until 2037).
On December 5, 2016, the first preparatory work began for an exploration shaft that is to be 175 m deep. The sinking scaffold was completed in May 2017 and the water treatment plant was put into operation in July. A depth of 145 m had been reached by the end of 2018. It is planned to take a large sample of 2,000 t to 3,000 t of ore. Mining of the deposit is to begin between 2018 and 2019. The tungsten deposits of camps 4 and 5 are to be exploited first and then the tin deposits of camp 5. The ore processing is to be tested and optimized in a pilot plant. This system is being built parallel to the depth of the exploratory shaft in the Mittweida-West industrial park in Lauenhain . In addition to the jaw crusher , the screening machines and the ball mill, the system consists of several flotation cells , thickeners , a drying system and the analysis laboratory. After a twelve-month trial run, the plant is to be dismantled and rebuilt as part of a larger plant in Pöhla.
IMCAL GmbH has had a majority stake in SME since June 2018 .
On April 29, 2019, the ore deposit was reached at a depth of 170.60 m. The mineralization here consists of the clayey ores typical of the deposit, which contain fluorite in addition to scheelite . After a few hundred tons of ore had been mined for trial operation of the processing plant, operations were stopped and the shaft flooded.
literature
- Werner Runge among other things: Chronicle of the bismuth . Ed .: Wismut GmbH. Self-published, Chemnitz 1999 (CD).
- Günter Hösel: The polymetallic skarn deposit Pöhla-Globenstein . In: State Office for Environment, Agriculture and Geology (Hrsg.): Mining monograph Saxony (= Mining in Saxony . Volume 8 ). 1st edition. Dresden 2001 ( Online [PDF; accessed December 31, 2016] The work is only available online in PDF format, divided into four parts).
- Klaus Grund: Mining between tradition and future, preparation for the re-exploration of a tungsten-tin deposit in the Ore Mountains . In: Jörg Benndorf (Ed.): Proceedings for the 18th Geokinematic Day on May 11th and 12th, 2017 (= series of publications by the Institute for Mine Surveying and Geodesy at the Technical University Bergakademie Freiberg ). Issue 2017–1. Freiberg 2017, p. 10-22 .
Web links
- Homepage of Saxony Minerals and Exploration AG
- Saxon State Ministry for Economic Affairs and Labor: reassessment of spar and ore deposits in the Free State of Saxony (page 86: Pöhla-Globenstein)
- Wismut: The Wismut location in Pöhla
Individual evidence
- ↑ Hösel: The polymetallic skarn deposit Pöhla-Globenstein . 2001, p. ? .
- ↑ a b Company overview . SME, accessed December 5, 2016 .
- ↑ Shallow pits are small exploration shafts of relatively shallow depth
- ^ Mining / mining. SME, accessed December 5, 2016 .
- ↑ In the Ore Mountains exploration of tungsten and tin begins. In: Free Press. Retrieved December 5, 2016 .
- ↑ Exploration shaft. SME, accessed November 5, 2017 .
- ↑ Ore processing plant in Mittweida before the start. SME, accessed November 5, 2017 .
- ↑ Pilot processing plant. SME, accessed November 5, 2017 .