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Bentonite usually forms from weathering of volcanic ash, most often in the presence of water. However, the term bentonite, as well as a similar clay called tonstein, have been used for clay beds of uncertain origin. For industrial purposes, two main classes of bentonite exist: sodium bentonite and calcium bentonite.
This list of mines in Bulgaria is subsidiary to the list of mines article and lists working, defunct and future mines in the country and is organised by the primary mineral output. For practical purposes stone, marble and other quarries may be included in this list.
Bentonite layers from an ancient deposit of weathered volcanic ash tuff in Wyoming Gray shale and bentonites (Benton Shale; Colorado Springs, Colorado). Bentonite (/ ˈ b ɛ n t ə n aɪ t / BEN-tə-nyte) [1] [2] is an absorbent swelling clay consisting mostly of montmorillonite (a type of smectite) which can either be Na-montmorillonite or Ca-montmorillonite.
List of countries by bentonite production; List of countries by feldspar production; List of countries by lithium production; List of countries by palladium production;
Bulgaria relies on imported oil and natural gas (most of which comes from Russia), together with domestic generation of electricity from coal-powered and hydro plants, and the Kozloduy nuclear plant. Bulgaria imports 97% of its natural gas from Russia. [72] The economy remains energy-intensive because conservation practices have developed slowly.
Energy is one of the most important sectors in the Bulgarian economy, as it accounts for 18.2% [12] of total industrial production and employs 10.9% of the workforce in the secondary sector. Bulgaria is the primary exporter of electricity in south-eastern Europe as well as a major transit country for Russian oil and gas.
The Galata gas field is a natural gas field located on the continental shelf of the Black Sea approximately 25km Southeast of Varna, Bulgaria. [2] The field was the first to be developed offshore Bulgaria, and at peak production provided more than 16% of Bulgaria's domestic gas needs, the platform and associated infrastructure is still the only production facility located in the Bulgarian ...
In April 2023 Lukoil Bulgaria and Lukoil Neftohim Burgas were fined 195 million Lev (€100m) for abuse of a dominant position on the oil market contrary to national and European competition law. [8] On 15 August 2023 Bulgaria took operational control of the Burgas Rosenetz oil terminal from Lukoil by terminating the concession contract. [9]