Frequently Asked Questions (FAQ)
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Appearance: It is brittle and has a brassy gold to silvery white metallic shine.
It’s appearance sometimes confounded old time prospectors who mistook it with pyrite or arsenopyrite. It commonly occurs in the presence of sulfide minerals. Unlike most Pyrites, Calaverite contains significant gold – about 40% gold by weight. With a 40 percent gold content by weight, you can see it wouldn’t take much calaverite to make for some very rich ore.
A short history about Calaverite and the acclaimed Gold Rush:
Calaverite was first recognized and obtained in 1861 from the Stanislaus Mine, Carson Hill, Angels Camp, in Calaveras County, California. In the initial phase of the Kalgoorlie gold rush in Western Australia in 1893, large amounts of calaverite were initially mistaken for fool's gold, and were discarded. The mineral deposits were used as a building material, and for the filling of potholes and ruts. Several years later, the nature of the mineral was identified, leading to a second gold rush of 1896 that included excavating the town's streets.
Gold Bearing Quartz is one of the world's rarest forms of natural gold. It is found underground by hard rock miners in only a few locations in the world. Most of the World's production comes from a handful of mines in Northern California. This unique formation of very difficult to find "POCKETS" of GOLD in QUARTZ is being mined 1500 to 2500 feet below the earth's surface. http://www.orocal.com/gold_quartz
Veins of gold bearing quartz are well known in California, and historically they have produced millions of dollars worth of gold. Their formation and the gold they contain are of interest. Quartz mines are found and worked in a great many counties in California, from Siskiyou on the north to San Diego on the south.
Gold is extracted or recovered from various types of ores, mostly from of Iron Oxide Copper Gold Ore. There are various ways to process these ores depending on: 1. which mineral is being extracted, 2. the amount of ppm (parts per millions), 3. the fineness of the gold itself. (Hydrometallurgical, and pyrometallurgical processes are the most common.)
"Gold mining from alluvium ores was once achieved by techniques associated with placer mining such as simple gold panning and sluicing, resulting in direct recovery of small gold nuggets and flakes. Placer mining techniques since the mid to late 20th century have generally only been the practice of artisan miners. Hydraulic mining was used widely in the Californian gold rush, and involved breaking down alluvial deposits with high-pressure jets of water. Hard rock ores have formed the basis of the majority of commercial gold recovery operations since the middle of the 20th century where open pit and or sub-surface mining techniques are used."
A nugget is a chunk of native gold metal (see definition below).
Alluvial gold is found in the water and reef gold is found in rocks, particularly Quartz.
Reef gold is worth more than alluvial gold. In mining, Reef refers to a vein of high grade ore. Alluvial gold is gold that has been moved and ground down by water. Placer gold (alluvial gold), which is the gold dust, is discovered in river and stream beds.
Here's a great link for more information:
Getting Gold – A Practical Treatise for Prospectors, Miners, and Students.
Native Gold is a true gold ore that includes the natural solid combination of silver in gold along with copper, iron, and less often, bismuth, mercury, platinum, manganese, and other metals.
Here's a great link for more information:
THE MINERAL NATIVE GOLD
The gold consumption keeps expanding in recent years. Take China for example, In 2011, China consumed 769.8 metric tonnes of gold in jewelry and investments by individual as compared to 639.2 tonnes in 2010 and 392.7 tonnes in 2008.
With the increase in the price of gold and the worldwide economic slowdown, investment in gold has hugely increased. As a result, people begin to draw attention to the gold ore crushing equipment. But how does a gold crushing plant work?
At first, let me tell you something about gold ore. Gold ore is a type of ore that can be obtained through mining gold rocks. Gold ore is commonly found beside stone blocks deep underground, usually in a vein of 2-9 blocks.
To withdraw gold from gold ore, a crushing plant is extremely necessary. According to a famous crushing company in China, the equipment included in the whole plant is: ZSW vibrating feeder, PE jaw crusher, PY cone crusher, and vibrating screener.
Large raw gold ore are fed to the jaw crusher evenly and gradually by vibrating feeder through a hopper for primary crushing. The jaw crusher can break the gold ore rocks into 150mm or 6 inch. After first crush, the material will transferred to cone crusher by belt conveyor for secondary crush; the crushed gold ore stone will then transferred to vibrating screen for separating. After separating, the particles meet the standard will be transferred away as final products, while the oversized ones will be returned to cone crusher, thus forming a closed circuit. The size of final products can be combined and graded according to your specific requirement.
With the advantages such as high crushing speed, together with large feed opening, provides impressive rates of production, yet able to provide superb reduction ratios, DSMAC Gold Mining Crushing Plant stands the test of time.
Raw materials —– ZSW vibrating feeder —– PE Jaw crusher (Primary crusher) —– PY Spring cone crusher (Secondary crusher) —– YK Circular vibrating screen
The gold will be fed into PE jaw crusher by the ZSW vibrating feeder, and this is the primary crushing. Then the materials come from jaw crusher should be sent into the PY spring cone crusher by belt conveyor for receiving the fine crushing. The adoption of YK circular vibrating is to help the customers get appropriate granularity at last.
It is wise for you to take the configuration into considerate when choosing right cold processing plant, for it aims at minimizing the investment and maximizing the profits.
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Gold is often found associated with the mineral quartz. It is sometimes associated with other minerals as well, including iron and manganese oxides, calcite, pyrite and other sulfides as well. It is not uncommon for prospectors, especially those who operate metal detectors, to find a rich gold bearing specimens of ore. Sometimes the best use of these minerals is to sell them at specimens. There are collectors who will pay top dollar for beautiful mineral specimens that contain significant gold. I have done a full webpage to discuss the best ways of getting top dollar for specimens and selling to collectors. (Selling your gold) Some specimens however, especially those with a large amount of rock and only a limited amount of gold are best crushed and the gold extracted and sold to refiner (information about selling to refiners can also be found on my gold selling page). Here is a discussion of the procedures to crush Quartz or other minerals and extract the gold from these rich ores.
To separate the gold from the ore collected by the diggers in the mine tunnel, the ore was first crushed by a series of gold ore crusher.
For really large chunks of material, it may be necessary to initially break down the large pieces with hammers. Sometimes heavy-duty chisels can also come in handy in this part of the process as one breaks down large chunks into fist sized and smaller pieces that can be more easily handled.
The classic old mortar and pestle was the method used by early day miners to crush their ore specimens for testing. You can still buy these things today at most prospecting stores – they are made of cast iron and last a long time and work fairly well. It just takes a lot of elbow grease and work to break up the rock.
A slightly different version of mortar and pestle work is a variety called hand stamp crushing. A heavy cylinder of iron is welded to a long rod and placed inside a pipe or tube which is just a bit larger than the diameter of the iron cylinder. This iron cylinder is picked up and dropped onto the ore, much in the manner of the old time stamp mills. This method seems to be popular in Australia.
A more expensive but certainly faster and easier method is to use a small jaw crusher, such as is used in preparing samples for assaying. I have one of these in my garage and it is pictured at the right. For those thinking about processing larger quantities of ore such as hundreds or even thousands of pounds of rock from mines, there are several manufacturers that sell small portable hammer and impact mills. These mechanized crushing systems can generate some very significant dust, and so when using them is important to consider methods for dust control or elimination.
The crushed ore was then run over copper plates that had been treated with cyanide and then tinned with "quick-silver" (mercury). Mercury has a chemical affinity to gold and hence catches it. The resulting mixture was then heated to evaporate the mercury until only the gold remained.
This method of extraction was used for many years although it was generally accepted that it was only 60% effective.
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SBM is a famous mining equipments company in China, and supplies all kinds of mining machinery for the clients all over the world.
A completely gold ore concentrating plant, or gold mining equipment , which is able to separate gold from rock ore, consist of a multi-step process that involves crushing and grinding the gold ore, creating a liquid solution, including additives to cause the gold to precipitate out of the solution and gathering the gold. When the gold is separated from the raw gold ore, further refined process will remove impurities. Gold particles that found in thick veins is economically easy to separate from the rock ore independent of the price of gold; while, gold particles that found in large rock ore deposits are only economically feasible to separate when the price of gold is high. No matter where it fond, the gold ore processing line, gold mining equipment for sale mainly include the following process.
Gold Ore Concentrating Process
Firstly, there are crushers for gold mining, crushing and grinding the ore. When the natural gold ore are fond, most of them are big lumps and can not be concentrated directly. So the producer need transport gold ore rock from the mine site to crushing and grinding plant. The gold ore crusher will crush it into small particles and then the milling machine for gold ore will grind the aggregates to create sand-sized particles from the ore. The sand is composed of gold particulates and other useful metals, dependent upon the geologic formation from which the gold ore is found.
Secondary, the ground particles will be mixed with liquid, and the sand washing plant will be used. A liquid mixture is necessary to begin frothing to induce the separation of gold from other material. When liquid is added in the process, a frothing agent must be added to cause the mixture to create foam. There are kinds of stuff; usually productive frothing agents are camphor, amyl alcohol, gas tar, phenols and essential oils. Also a collection agent will be added to the frothing mixture. The collection agent bonds with the gold particle and forms an oily film that collects onto the air bubbles used for frothing. Productive agents belong to the n-alkanol chemical family and include n-butanol, n-pentanol and n-hexanol. Meanwhile, organic chemicals will be added to the mixture. These chemicals prevent other contaminants, originated in the rock ore, from adhering to the air bubbles. A productive organic chemical addition is carbon, to which the other contaminants will bond, leaving the gold to adhere onto the air bubbles. The froth contains the gold particulates that will be further refined to remove impurities. The gold concentrate floats on top of the bath, but in a separate cell for easy collection. The water bath is collected from the bottom of the cell. This process is well-known as gold flotation and various flotation machines can be used in the flotation.
Thirdly, cyanide can be added to further refine the gold to remove impurities after collection, such as sulfides; The gold concentrate can also be heated in a smelter and the molten metal poured into containers according to producers' demands.
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Some other methods are also used in gold ore concentrating plant (gold mining equipment for sale), it is quite flexible. So if you want to know more details about other ore crushers or if you have some doubts, just be free to contact us.Want more, you can refer here quartz crushing machine or http://www.quartz-crusher.com
Author: Tevin A Jones
Of all the known metals here on Earth, gold is the most popular and most loved of them all. Despite of its scarcity of supply, gold is the most widely used transition metal and you can find a wide variety of products manufactured out of the element in almost all countries across the globe. Although history shows that a lot of gold nuggets especially the large ones were discovered just a few meters deep from the Earth's surface, most of the said element can be found at least a kilometer deep beneath the ground.
Go here for more info Sell Gold
To date, there are about a hundred active gold mines scattered all across the globe wherein most are found in the regions of South Africa, Australia, and America which places these said countries at the top of the world's leading gold producers of all time. Basically, there are two main approaches in extracting gold out of the Earth's crust which are through placer mining and hard rock mining. Placer mining is the most typical approach used in the early gold rushes that took place in the human history. However, such approach is still widely used today in the mining industry. One good example of placer mining is an open pit gold mine. Such a mine is typically enlarged through time until gold resources are totally consumed or exhausted. The largest of this kind is the Fimiston Open Pit otherwise known as the Super Pit which is located at Western Australia. The mine measures to be approximately 3.5 kilometers long, 1.5 kilometers wide, and with a depth of 360 meters.
And from placer deposits, gold still has to be separated from its ore through the aid of certain processes. One of which is through sluicing which utilizes a sluice box placed within a stream wherein through the aid of the force of the water flow, gold is effectively dropped out of the suspension. Another effective yet a more manual way of doing this is through panning which is done by placing sand that is suspected to contain gold into a shallow pan which is then filled with water and shaken until gold is sorted out from the gravel.
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In most cases, hard rock mining is applied on various gold mines especially from countries that are considered as world leaders in producing gold. Hard rock mining is effective when it comes to extracting gold that are encased or stuck within layers of rock. One good example if this is a vertical shaft mine which reaches to a depth of more than 3,000 meters. The deepest known vertical shaft mine is the East Rand Mine which extends up to 3,585 meters deep into the Earth's crust.
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Tevin A Jones – Expert Author
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Author: Manoj Sompura
Gold Mining Terminology
With years of experience in mining industry, Rachana Global is a dominant player in providing services for Gold mining and Fluorite mining. Rachana Global is one such exploration and mining services provider whose name can best be associated with all the gold mining terminology as stated below:
Flour Gold/Gold Dust: Gold that is so fine that it looks and feels like flour or dust is called flour gold or gold dust.
Hard Rock Mine: A hard rock mine is a tunnel that is dug into solid rock for the sole purpose of finding valuable or precious rocks, minerals, or metals. Gold originates deep within the earth in places called Pockets. The pockets are filled with gold, heavy ore, and quartz.
Hard Rock Mining: Hard rock mining refers to the underground mining techniques used to excavate hard minerals, mainly those minerals containing metals such as ore containing gold, copper, zinc, nickel and lead.
Placer Mining: Placer Mining is the most common form of mining, it involves mining gold that has been washed away from it's source and deposited in small cracks, holes, or sand bars in the mainstream of a river. It almost always involves the use of water in some way or another. Placer mining tools generally include the rocker box, sluice, dredge, highbanker, shaker table, dry washer, and always the pan.
Electronic prospecting: Electronic prospecting is a method for detecting gold, silver or other types of precious metals using a metal detector. The most known of electronic prospecting is done when nuggets are searched for.
Ground Balancing: Ground balancing is the ability a metal detector has in order to ignore or get rid of the effect of detection of iron minerals or salt that is wet. Ground balancing is very important when it comes to searching for gold.
Gold Panning: The process of locating the richest gold bearing ground with the help of detecting equipments like gold pans and dredges.
Wet Panning: Wet panning is the action that is done for gold with water that is used to create the state of suspension that allows the gravity to make the gold flakes sink into the riffles of a gold pan.
Gold Metallurgy: The process of recovering gold from its ores, refining it and preparing it for commercial use is known as Gold Metallurgy.
Gold Mining: The technical and mechanical way of removing gold from its ores using various mining methods is known as Gold mining.
Gold Refining: The mechanical process of separating valuable gold from the other waste materials from its ore using gold refining equipment is called gold refining.
Smelting: Smelting is the purifying process of heating the gold with a chemical substance called flux. The flux bonds with the contaminants and floats on top of the melted gold. The gold is then cooled and allowed to harden in molds, and the flux-contaminant mixture (slag) is hauled away as a solid waste.
Gold dredging: The process of extracting gold from sand, gravel and dirt using water and mechanical methods and placer mining equipments like gold dredge is called as gold dredging.
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Rachana Engaged in natural resources exploration, mineral mining, coal mining, iron ore mining, gold mining, titanium mining, fluorite mining, mining minerals, mining coal in Colombia, Zambia, Congo and Indonesia. SEO services provided by Jigney Bhachech, CEO, Opal Infotech, India.
Author: Moussa T
A bullion is a mass of any one of the known precious metals.
By strict definition, precious metals are those metallic elements that are rare.
A bullion is commonly made of either gold or silver. Its value is determined by the worth of the metal rather than by its face value as money.
To put it another way, a bullion is valued based on the mass and purity of the metal used, instead of its artificial currency value.
New sources of ore have been discovered and there also have been improvements in the mining and refining processes. These two factors may cause the values of gold, silver, and the other precious metals to diminish.
Also, the "precious" qualification of a metal is determined by the market value or high demand.
Bullion is traded on commodity markets in two forms: bulk ingots or coins, the latter minted by the government of a country.
At least ten countries are known to mint gold and silver bullion coins. These are Australia, Austria, Canada, China, Mexico, Poland, South Africa, Switzerland, the United Kingdom, and the United States.
While bullion coins are issued as legal tender, with nominal values assigned to them on minting, such face values are far below the commodity value of the metals themselves. Here's an example: Most of the gold coins issued by national governments, particularly those with currency values of between 10 and 100 U.S. dollars, usually contain no less than 31 grams of gold. On the average (considering the consistent rise in the exchange rate of gold), the value of gold is around USD12 per gram. Here, it is clear that the currency value assigned by the government to a gold bullion coin has no meaning.
Below is a list of some of the government-issued gold and silver bullion coins:
1. Australian Gold Nugget, Lunar Series I, and Lunar Series II
2. Austrian Philharmoniker
3. Canadian Maple Leaf
4. Chinese Gold Panda
5. Mexican Centenario, Libertad, and Onza
6. Polish Orzel bielik
7. South African Krugerrand
8. Swiss Vreneli
9. British Britannia and Sovereign
10. American Buffalo, American Eagle, and Double Eagle
The 10,000-dollar Australian Gold Nugget is one of the world's largest bullion coins. Minted by the Australian government, this bullion coin is made of 1 kilogram of 99.9% pure gold.
Some other bullion coins larger than the Australian Gold Nugget have come out. However, these are not produced in mass quantities and are not practical to handle. Two examples are
given here: One is the 100,000-euro Vienna Philharmonic, minted in 2004, which contains 31 kilograms of gold;
the other is the 1 million-dollar Canadian Maple Leaf, minted in 2007, which contains 100 kilograms of gold.
Three factors – metal, purity, and weight – affect the value of bullion.
The overall value of bullion is determined by the metal used. We know, of course, that platinum is worth more than gold, which, in turn, is worth more than silver. It is easy to understand, therefore, that silver bullion coins have become popular with collectors because of their relative affordability.
About the Author
The purpose of this website is to:
1) Make people aware of the true potential of investing in gold bullion coins and bars.
2) Educate people on the story and value of Gold, Silver and Platinum group metals.
3) Provide ourselves and others a way to save and invest for future needs, build wealth and reach financial stability.
4)Provide information on viable, legitimate, and profitable income and gold bullion investment opportunities.
How do I find out how much gold is in these Calaverite mineral specimens? Can Calaverite be refined?
There are ways to find out how much gold is in these pieces, although some of the traditional methods to see the gold may not be sufficient proof.
For example, you cannot do a smudge test to find gold within Calaverite, since the piece contains other metals, iron, copper, platinum, rhodium and within some pieces, quartz. And you cannot see the gold within Calaverite under a UV light.
On a positive note – you can have a fire assay test done if you need further confirmation than the assay test we provided for you.
If you'd like to know how to extract the gold, one must perform an initial roasting before you can do a high ORP pretreatment followed by a chemical leach which works wonders on black sands, ultra fine gold particles, and gold that is bonded with other elements except sulfer.
Using a high ORP pre-treatment followed by wet chemical extraction, including Aqua Regia, you can often extract the remaining gold, and then from the rest of the concentrates that is not recoverable you can use a gravity separation method.
More FAQ's coming soon – If you have a question, please contact us.
here is a link to a simple conversion calculator
Answers: One ounce (oz) is approximately 0.911458 troy ounces. To convert your gold ounce (oz) figure, simply use our converter above.
Answers: One gram (g) is approximately 0.0321507 troy ounces. To convert your gold gram figure, simply use our converter above.