Know the Different Types of Mining Processes

Mining has become a controversial industry because of its "devastating" effect to the environment and the ecosystem. However, it has contributed so much to civilization that without it, we could never be where we are today in many aspects.

There are two basic methods of mining. These are the surface and the underground mining processes:

1. Surface Mining

This involves the mining of minerals located at or near the surface of the earth. This encompasses at least six processes and these are:

• Strip Mining - this involves the stripping of the earth's surface by heavy machinery. This method is generally targeted at extracting coal or sedimentary rocks that lay near the earth's surface.

• Placer Mining - this involves the extraction of sediments in sand or gravel. It is a simple, old-fashioned way of mining. This method is generally applicable to gold and precious gems that are carried by the flow of water.

• Mountain Top Mining - this is a new method which involves blasting of a mountain top to expose coal deposits that lie underneath the mountain crest.

• Hydraulic Mining - this is an obsolete method that involves jetting the side of a mountain or hill with high pressure water to expose gold and other precious metals.

• Dredging - it involves the removal of rocks, sand and silt underneath a body of water to expose the minerals.

• Open Pit - this is the most common mining method. It involves the removal of the top layers of soil in search for gold or buried treasure. The miner digs deeper and deeper until a large, open-pit is created.

2. Underground Mining

This is the process in which a tunnel is made into the earth to find the mineral ore. The mining operation is usually performed with the use of underground mining equipment. Underground mining is done through the following methods:

• Slope Mining - it involves the creation of slopes into the ground in order to reach the ore or mineral deposit. This process is generally applied in coal mining.

• Hard rock - this method uses dynamite or giant drills to create large, deep tunnels. The miners support the tunnels with pillars to prevent them from collapsing. This is a large-scale mining process and is usually applied in the extraction of large copper, tin, lead, gold or silver deposits.

• Drift mining - this method is applicable only when the target mineral is accessible from the side of a mountain. It involves the creation of a tunnel that's slightly lower than the target mineral. The gravity makes the deposit fall to the tunnel where miners can collect them.

• Shaft method - this involves the creation of a vertical passageway that goes deep down underground where the deposit is located. Because of the depth, miners are brought in and out of the pit with elevators.

• Borehole method - this involves the use of a large drill and high pressure water to eject the target mineral.

These are the basic methods used in the extraction of common minerals. There are more complex systems, but still, they are based on these fundamental processes.

Source: http://ezinearticles.com/?Know-the-Different-Types-of-Mining-Processes&id=7932442

New Technique to Boost US Uranium Mining - Satellite Plants

If you study the news releases, several companies have discussed the setting up of one or more satellite plants in conjunction with their In Situ Recovery (ISR) uranium mining operations. In order to help readers better understand what exactly a 'satellite plant' is, we interviewed Mark Pelizza of Uranium Resources about how this relatively new operational technique is presently being used at the company's Texas operations. This is part two our six-part series, describing the evolution of ISR uranium mining, building upon last year's basic series on this subject.

A larger uranium deposit, such as one at Cameco's Smith Ranch in Wyoming, requires a Central Processing Plant. The 'mother plant,' as it is called in the trade, can complete the entire processing cycle from uranium extraction through loading the resin, stripping the uranium from the resin with a solvent (elution), precipitating, drying and packaging.

With a satellite plant, also known as a Remote Ion Exchange (RIX), smaller and distant deposits can also be mined and then trucked to the mother plant. With an RIX operation, the front-end of the 'milling' cycle can be begun independent of the much larger mother plant. It is the same ion exchange column found at central processing facility. The mobility factor makes RIX an attractive proposition for many of the new-breed uranium producers. Rather than piping the water and uranium across a longer distance to the mother plant for the entire processing cycle, the modular nature of RIX allows for multiple columns at each well field doing the ion exchange on the spot.

This is not a new idea, but one which has instead been re-designed by Uranium Resources and is also used elsewhere. In the early 1970s, Conoco and Pioneer Nuclear Corporation formed the Conquista project in south Texas. Uranium was open-pit mined at between ten and fifteen mines within a thirty-five mile radius and in two counties. Trucks hauled ore to the 1750-ton/day processing mill near Falls City in Karnes County.

"The trademark of south Texas is a lot of small million-pound-style deposits," Mark Pelizza told us. "I think we are heading in the right direction to exploit those small deposits." Trucking resin beads loaded with uranium is different from trucking ore which has been conventionally mined. Small, scattered uranium deposits aren't only found in Texas. There are numerous smaller ISR-amenable properties in Wyoming, New Mexico, Colorado and South Dakota.

"About half the uranium deposits in New Mexico can be mined with ISR," Pelizza said, "and the other half would require conventional mining." A number of companies we've interviewed have geographically diverse, but relatively nearby properties within their portfolio. Several companies with whom we discussed RIX have already made plans to incorporate this method into their mining operations.

The sole-use semi-trailer trucks hauling the yellowcake slurry are different from the typical dump trucks used in conventional mining. According to Pelizza, the truck carries a modified bulk cement trailer with three compartments. The three compartments, or cells, each have a function. One cell holds the uranium-loaded resin, one cell is empty and the third has unloaded resin.

As per Department of Transportation (DOT) regulations, no liquids are permitted during the transportation process. Each container run between the wellfield and the mother plant can bring between 2,000 and 3,000 pounds of uranium-in-resin, depending upon how large the container is designed. The 'loaded' cell holds between 300 and 500 pounds of resin with six to eight pounds of uranium per cubic foot of resin. Age of the resin is important, too. New resin can hold up to ten pounds of uranium per cubic foot and can decline to five pounds of uranium per cubic foot after several years.

As we found with a conventional Ion Exchange process, the RIX system is run as a closed loop pressurized process to prevent the release of radon gas into the atmosphere. The uranium is oxidized, mobilized and pumped out of the sandstone formation into a loaded pipeline and ends up in an ion exchange column at the mining site. Inside the columns, uranium is extracted through an ion exchange process - a chloride ion on a resin bead exchanges for a uranium ion. After the fluid has been stripped of uranium, it is sent back to the wellfield as barren solution, minus the bleed.

When the ion exchange column is fully loaded, the column is taken offline. The loaded resin is transferred from the column to a bulk cement trailer, which is a pressurized vessel comprised of carbon steel with a rubberized internal lining. The resin trailer is connected to the ion exchange column transfer piping with hoses. After it has been drained of any free water, the uranium-loaded resin can be transported as a solid, known as 'wet yellowcake' to the mother plant. There, the yellowcake slurry is stripped from the resin, precipitated and vacuum-dried with a commercial-grade food dryer.

Capital costs can be dramatically reduced with the satellite plants, or RIX units. "Well field installation can cost more than RIX," Pelizza noted. Often, installing a well field can start at approximately $10 million and run multiples higher, depending upon the spacing of the wells and the depth at which uranium is mined. Still, compared to conventional mining, the entire ISR well field mining and solvent circuit method of uranium processing is relatively inexpensive.

We checked with a number of near-term producers - those with uranium projects in Wyoming - and discovered at least three companies planned to utilize one or more satellite plants, or RIX, in their operations. A company's reason for utilizing this method is to minimize capital and operating expenses while mining multiple smaller deposits within the same area. Water is treated at the RIX to extract the uranium instead of piping it across greater distances to a full-sized plant. Pelizza said, "The potential for pipeline failure and spillage from a high-flow trunk line is eliminated."

Strathmore Minerals vice president of technical services John DeJoia said his company was moving forward with a new type of Remote Ion Exchange design, but would not provide details. UR-Energy chief executive Bill Boberg said his company would use an RIX for either Lost Soldier or Lost Creek in Wyoming, perhaps for both. Uranerz Energy chief executive Glenn Catchpole told us he planned to probably set up two RIX operations at the company's Wyoming properties and build a central processing facility.

"We are working on a standardized design of the remote ion exchange unit so it doesn't require any major licensing action," Pelizza said. "If you can speed up the licensing time, perhaps it would take one to two years rather than three to five years."

Source:http://ezinearticles.com/?New-Technique-to-Boost-US-Uranium-Mining---Satellite-Plants&id=495199

Revitalize and Refresh Your Home With a Dry Organic Deep Extraction Carpet Cleaning

While everyone is familiar with the old-style of water intensive steam-based carpet cleaning methods, few are aware of the benefits of high powered dry extraction carpet cleaning technology. With the environmental concerns of today, and water shortages throughout the country, dry extraction carpet cleaning is starting to gain popularity. This method employs the use of vigorous agitation, deep cleaning organic and biodegradable cleansing materials, and high powered vacuum extraction, to rejuvenate and cleanse deep into the carpet fibers.

The agitation system is composed of two counterrotating nylon brushes which are safe for any synthetic and natural carpet fiber. Natural material carries the cleaning agents and is spread similar to that of carpet powder. High vacuum pressure utilizing HEPA filtration extracts deep down dirt, grime and mold particles. Dry extraction carpet cleaning, while utilizing no water, will leave the carpet ready to walk on as soon as the cleaning is finished.

With old-style steam carpet cleaning it is oftentimes required to use several hundred gallons of water to achieve the same results. And while this type of carpet cleaning may seem less expensive, what many of these companies don't tell you, is that the water they will be using will come from your own tap. Many of the cheapest steam cleaning companies will simply utilize steam cleaning machines which will pump the used water back into your yard.

Dry extraction carpet cleaning requires no additional or hidden costs from the customer. The equipment is lightweight and easy to maneuver, allowing the technician to finish the job usually in half the time of conventional steam methods. Utilizing completely biodegradable organic carrier agents, this material is worked into the carpet to achieve the cleaning and then extracted through high-powered vacuum. The twin brushed agitation method stretches and extends the carpet pile, leaving a texture similar to that of freshly laid carpet.

The scent is pleasant and not overwhelming, leaving the home smelling fresh. Dry extraction carpet cleaning has been around for quite a few years commercialy, but only now is it starting to gain recognition and serious competition to other carpet cleaning services. When looking around for your next carpet cleaning service, consider a dry deep extraction system. With this method there are no harsh chemicals or cleaning agents that can harm your carpets, whether they are wool, shag, cut pile or premium import.

Try dry extraction cleaning the next time you want your carpet deep down clean, you won't be disappointed.

For the absolute best home cleaning and maid service on Metro North Atlanta. MaidPro can get the job done, you dirty it, we can clean it- guaranteed! We only use safe, organic, hypoallergenic, cleaning supplies and systems.

Source:http://ezinearticles.com/?Revitalize-and-Refresh-Your-Home-With-a-Dry-Organic-Deep-Extraction-Carpet-Cleaning&id=1608594