Mining

The specific gravity of granite typically ranges from 2.63 to 2.75.

You would screen out the larger rocks. Build a wooden frame, and use some screen that would exclude the rocks, but which would allow the pebbles to flow through. What he said works, but I consider pebbles to be small, kind of round, smooth stones. You could do what he said, or you could rake them, or depending on your situation, using your hands might be better, if you only need a few of them.

Clear sand is a type of sand that does not have impurities or color. It is commonly used in construction, landscaping, and for making glass. Its clean and uniform texture makes it ideal for various applications where a consistent appearance is desired.

Diamonds are mined all over the world, including Canada, the USA, Russia, Australia, Germany, Brazil, South Africa, even Sweden.

Note, however, that there are no diamonds mined in Europe or Antarctica.

Some cons of subsurface mining include the potential for environmental damage such as groundwater contamination, soil erosion, and habitat destruction. It can also have safety risks for workers due to the depth and confined spaces involved in underground mining operations. Additionally, subsurface mining can lead to land subsidence and disruption of the surrounding landscape.

Mining techniques can be divided into two common excavation types: surface mining (above ground) and subsurface (underground) mining.

sometimes subsurface mining is also called deep mining like in my text book p.s i am in 8th grade

Aluminum Potassium sulfate (Alum) can be purchased in any grocery store on the spice isle. It comes in the little spice containers and can be easy to over look. You may be able to buy it in a larger size container, but I have yet to find it in anything but the small containers.

In Australia it is not so readily available, however aussie-alum-supplies.com.au sell from 100g up to 20kg bags.

The Kola Superdeep Borehole was begun in 1970 and finished in 1992. It reached 12,262 meters deep. Work ceased due to the difficulties of drilling in extreme temperatures (~300 degrees Celsius) and lack of funding.

Iron ore consists mostly of oxygen and iron atoms bonded together into molecules. To convert these oxides of iron to metallic iron, they must be smelted or sent through a direct reduction process to remove the oxygen. Oxygen-iron bonds are strong, and to remove the iron from the oxygen, a stronger elemental bond must be presented to attach to the oxygen. Carbon is used because the strength of a carbon-oxygen bond is greater than that of the iron-oxygen bond, and the process is done at high temperatures. The iron ore must be powdered and mixed with coke, which is essentially carbon, and the combination must be burnt in the smelting process. The carbon dioxide byproduct goes off into the atmosphere and what is left is almost pure iron.

The Naga Deng Copper Mine is located in the northeastern state of Mizoram in India. It is situated in the Champhai district, near the border with Myanmar. The mine plays a significant role in the local economy and is a source of copper production in the region.

The host rock of emeralds is often a type of rock called beryl, which is a mineral that forms in pegmatites or hydrothermal veins. Emeralds are a variety of beryl that gets its green color from trace amounts of chromium or vanadium.

Iron ore doesn't melt itself, but rather it is smelted in a blast furnace to extract iron metal. The melting point of iron metal is approximately 1,538 degrees Celsius (2,800 degrees Fahrenheit).

Galena is the principal ore of lead. It is a sulfide mineral that is commonly found in deposits around the world.

This would be underground mining.

The method of extracting mineral ore by hand using simple tools is known as artisanal mining. This type of mining is typically done by individuals or small groups without the use of heavy machinery. Artisanal mining is often associated with informal and unregulated practices.

Crude iron refers to impure iron that has not been refined or processed. It typically contains elements such as carbon, silicon, sulfur, and phosphorus, which need to be removed in order to produce pure iron. Crude iron is usually obtained from iron ore through processes like smelting or direct reduction.

direct reduction: FeO + C = Fe + CO

indirect reduction FeO + CO = Fe + CO2

I don't think that is what the terminology 'direct reduction' means in this context. For a start most directly reduced iron (DRI) is produced using CO and H2 produced from natural gas. I think the correct meaning is that 'direct reduction' is called direct because it directly produces iron (as a solid sponge because iron has a high melting point - see the 'bloomery process' for producing wrought iron), while the indirect process produces iron via 'pig iron' which is a high carbon alloy of iron (produced as a liquid because of the reduction in melting point caused by the carbon - see 'Osmond' process).

The Oak Ridge facility was the location of the big enrichment program put together by the U.S. in World War 2. It is now the Oak Ridge National Laboratory, and it is located in Oak Ridge, Tennessee. Need links? You got 'em.

Bauxite is not a metallic substance. It is an ore composed mainly of aluminum hydroxides, with various impurities such as iron oxide and silica. When refined, bauxite is used to produce aluminum metal.

Because there is no roof to support in an open cut whereas in underground mining there may be a very large overburden load leading to very high stresses in the tunnel roof. This may require support and there is the potential for a roof collapse to occur.

Opal mining is not a prominent activity in Texas. While there may be some small-scale mining operations, Texas is not known for its opal deposits compared to other states like Nevada or Idaho.

Bauxite is a major ore of aluminum, usually occurring as a clay. Major producers of bauxite are Australia, Jamaica and Brazil. It is abundant in Jamaica, Brazil, Surinam, French Guiana, France, Hungary, and in the states of Alabama, Georgia, and Arkansas in the U.S.

When iron and silver are mixed together, an alloy called steel is formed. Steel is a combination of iron and carbon, with the addition of silver resulting in a stronger and more corrosion-resistant material.

Mining calcium, often in the form of limestone, can have various environmental impacts such as habitat destruction, groundwater contamination, and air pollution from dust and greenhouse gas emissions. It may also contribute to soil erosion and disrupt local ecosystems. Implementing sustainable mining practices and reclamation efforts can help mitigate these negative impacts.

Mining in Antarctica is prohibited under the Protocol on Environmental Protection to the Antarctic Treaty due to concerns about preserving the pristine environment and preventing pollution. The extreme environmental conditions, logistical challenges, and minimal economic feasibility also contribute to the lack of mining activities in Antarctica's mineral-rich areas.