wolframite वाक्य
उदाहरण वाक्य
मोबाइल
- Portugal, as the main European source of the element, was put under pressure from both sides, because of its deposits of wolframite ore at Panasqueira.
- In addition to copper mines, children with their families participate in artisanal mining of cobalt, wolframite, cassiterite, columbite-tantalite, gold, diamonds.
- It is flanked by killas, formed by contact metamorphism, which also contains veins although wolframite and cassiterite is found as a lower percentage of the rock bulk.
- Quartz and quartz-feldspar veins form a stockwork with minor mineralisation, whilst greisen bordered veins are found in a sheeted vein system with wolframite and minor cassiterite mineralisation . s
- Other examples of series include the olivine series of magnesium-rich forsterite and iron-rich fayalite, and the wolframite series of manganese-rich h�bnerite and iron-rich ferberite.
- In April 2009, Brownback introduced the Congo Conflict Minerals Act of 2009 to require electronics companies to verify and disclose their sources of conflict minerals, such as cassiterite, wolframite, and tantalum.
- Although reserves of Wolframite and other tungsten ores are believed to remain, the Harding vein beneath Knott has long been worked out and the levels were used for dumping sludge from ore processing operations.
- Veins of cassiterite ( tin oxide ) and wolframite ( a mineral containing iron, manganese and tungsten ) are found associated with the greisens, the former deposited by high salinity, low, fluids and the latter by low salinity, high fluids.
- Wolframite and arsenic was also produced at the mine, the former accounting for around 50 tons to 150 tons between 1907 and 1956, and the latter between 500 tons and 1000 tons during between 1907 and 1919, declining to 100 tons by 1956.
- Reports from 2007 state that 14, 694 tons of cassiterite ( $ 45 million USD ), 1, 193 tons of wolframite ( worth $ 4.27 million USD ) and 393 tons of coltan ( $ 5.42 million USD ) were exported in 2007.
- Careful searchers can also find crystals of wolframite, a tungsten ore that was mined briefly during World War II when access to other sources was cut off, and small grains of topaz, which caused the earlier silver miners of the area considerable economic grief by wearing out their diamond-tipped drills more quickly than anticipated.
- Outside of the main urban area of Egvekinot, the economy is driven mainly by either mineral extraction ( the area is rich in pewter and wolframite as well as coal ), traditional indigenous reindeer herding or sea-based hunting, with Chukchi farming centers such as Amguema, Vankarem, and Konergino holding nearly 25, 000 head of reindeer in 2005.
- The four most commonly mined "'conflict minerals "'( known as 3TGs, from their initials ) are cassiterite ( for tin ), wolframite ( for tungsten ), coltan ( for tantalum ), and gold ore, which are extracted from the eastern Congo, and passed through a variety of intermediaries before being purchased by multinational electronics companies.
- Also by its resolution, the Council recommended that all States, particularly those in the region, regularly publish full import and export statistics for natural resources, including gold, cassiterite, coltan, wolframite, timber and charcoal, and enhance information sharing and joint action at the regional level to investigate and combat regional criminal networks and armed groups involved in the illegal exploitation of natural resources.
- He is running to retrieve a lump of wolframite ( " a good, dense, black African mineral " ), a small tablet of gold, a bar of tungsten, a snippet of gallium, a goblet of uranium glass . ( " It doesn't register on my Geiger counter, but it's sufficient to give this lovely, greenish-yellow shimmer . ")
- Most recently, the Dodd-Frank Wall Street Reform and Consumer Protection Act ( also known as the Financial Reform Act ) signed into U . S . law by President Barack Obama on July 21, 2010 contains a clause that specifically requires companies with products containing cassiterite ( tin ore ), columbite-tantalite ( coltan ), wolframite, and gold to disclose to the Securities and Exchange Commission ( SEC ) whether the minerals are sourced from the Democratic Republic of Congo or adjoining countries.
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