Contact phone:0086-755-36939309 Fax:0086-755-86241263 E-mail:lisaseek@gmail.com MSN:zgzg1125@hotmail.com
Keywords: 
     
   Purchase Your current location is£ºHome >> Products >> Metal and Minerals >> gold ore
 
¡¾Product Name¡¿£ºGold Mine
¡¾Categories¡¿£ºgold ore
¡¾Item NO¡¿£ºGold Mine-1
¡¾Specifications¡¿£ºGold Mine All
¡¾Unit¡¿£ºTon
¡¾Keywords¡¿£ºGold Mine£¬gold ore£¬gold
¡¾Document download¡¿£ºClick to download
   Description:

¢ñ. General Description of Gold Mine
In fact, gold is the first metal found by people and it can be traced back to Neolithic age. People make native gold into different forms of tributes and artifacts by using stone wares. Gradually, people realize the different characteristics of Au from other metals. And gold is loved by people due to its beauty, rarity, value, stability, and the perfect ductility.
The chemical element symbol of gold is Au, it originated from Latin AURNM and the original meaning of it is dawn and it is derive from aurora. Because of its glitter, people used to associating it with sun. The ancients worship the sun as well as they worship gold, so there are many legends about gold and sun and they are spreaded among people broadly. 
Chemical composition
Au, the atomic number of it is 79, locating in the first IB of the six periods in the periodic table of chemical element, it belongs to the copper family elements. The atomic nucleuses of Au are made up by 79 protons and 112 neutrons, so it is odd and uneven nuclear class, which deciding that the abundance of Au in the natural world is very low.
The chemical property and the G-BASE of Au
1. The chemical property of Au
The chemical property of Au is stable and it has very strong corrosion-resistance. Generally, it will not oxidize under the normal and the high temperature. Au is not soluble in the common acid and alkali, but it can soluble in some mixed acid, such as aqua fortis. Besides, Au can soluble in alkali metals, prussiate, acidic thiorea solution, bromine solution, boiling ferric chloride solution,
Sulfide of alkali metal can corrode Au, producing solubility auric sulfide. The humic acid in the soil and the metabolin of some bacterium can corrode trace Au. Because the ionizing of Au is high, it is uneasy to lose the outer electron as positive ion, and it is difficult to accept electron as negative ion. The chemical property of Au is stable, so the affinity of it with other chemical elements is low. Thus, in most cases, Au exists as elementary state in the natural world.
2. The G-BASE of Au
Au has affinity with sulphur substances, and it always exists with sulfide closely such as iron pyrite, arsenopyrite, galenite, antimony, etc. It forms as metal compound easily with silver (Ag) and copper(Cu), both of  which have affinity with sulphur.
Au has affinity with iron (Fe), the amount of iron(Fe) in meteoric iron (1150¡Á10-12) is three order of magnitude higher than the common rock.. Au always forms as internetallic compound with platinum family element which has affinity with Fe.
Au also has affinity with copper (Cu), taking up the edge of affinity with copper and affinity with iron in the periodic table of chemical element As it is the same with Silver, Au belongs to the identical subgroup, but under the original geological environmental state, the golden geochemistry behavior are similar to its neighboring elements displaying a stronger affinity with iron. Copper and silver are concentrated in the sulfide phase. But gold and au are mainly concentrated in the metallographic phase.
The gold in the Earth the elemental abundance is 0.8¡Á10-6, in the core 2.6¡Á10-6, in the mantle 0.005¡Á10-6, and in the earth's crust 0.004¡Á10-6. Golden in earth's crust abundance is only 1/10,000,000, of iron and 1/21of silver.
More than 99% of the gold on the earth came into the Earth's core. This distribution of gold is a long-term evolution of Earth's formation. The abundance of gold is high at the earth¡¯s early developing period, therefore, greenstone belt, in particular, the formation of mafic and ultramafic volcanic rock, which can represent the remnants of the early crust, the abundance of Au is over high than other rocks on the earth¡¯s crust, and probably they could be the earliest source bed.
In summary, the abundance value of gold in the Earth¡¯s core is very low, what¡¯s more, it has an affinity with sulfur tolerance, pro-copper nature of the pro-rail, and it has high melting point and other qualities. To form industrial deposits, gold will have to enrichment thousands of times; to form the large minerals and rich ore , gold will have to enrichment more than ten thousands of times, or even higher. It shows that it will take a long geological time to form the huge gold mine., besides, the formation the huge gold mine will need a variety of sources and lots of times superposition of ore deposit.
The structure morphology of Au
Au has only one stable isotope in nature, 197. The morphologies of Au under the normal temperature are crystal, equiaxed crystal and cubic plane lattice. The natural good crystal form is extremely rare, and usually, it exists as the irregular granular, lump, sheet, mesh, dendritic, fibrous and sponge-like aggregates forms.
The color of pure gold is golden. The color will change accordingly if there is impurity in gold, for example, if there is silver (Ag) or platinum in gold, the color will become light; if there is copper(Cu) in gold, the color will become dark. It can be evaluated the quality of gold according to the gold streak color drawn on the assay plate. The color of high ¨Cpurity gold bars mark is red yellow; with 10% of the silver in gold, the color of the streak will be bright golden yellow; with 20-30% silver in gold, the color of the streak will be grass yellow; with more than 30% of silver in gold, the color of gold will be the yellow in color with green; with silver over 50%, the golden yellow color of gold will become near silver.
Optical properties
Gold has a bright luster, and the average reflection rate of gold under the white light is 74%. With the silver content increases, the reflecting rates will increase, so will the hardness of gold, but the density of gold will decrease. Therefore, it can determine the quality of gold by its hardness.¡¡
Physical property¡¡
The volatility of gold is poor. It almost does not volatile above the melting temperature to 1300¡æ, but the volatility increases greatly under the atmosphere of volatile gas and CO. Therefore, under the cover of carbon, it will cause the loss of gold when smelt due to the volatility. The scalability of gold is excellent. 1g of pure gold can be pulled into the 3500m long, with the filament diameter as 0.00434mm, or pressed into a gold foil with thickness of 0.23¡Á10-8mm of.
The mineral of gold and its typomorphic peculiarities
The mineral of gold and its classification
According to the structural state of gold and the gold content in minerals, gold deposit mineral can be divided into three categories- gold minerals, mineral-bearing gold and mineral containing gold. The so-called gold minerals, referring to the gold produced by the form of gold minerals and mineral-bearing gold, is the most important existing form of gold in the nature world. It also is used for the development of industry. So far, gold has been found in 98 kinds of minerals and gold-bearing minerals, but only 47 common species, while the industry directly using only 10 kinds of minerals.
The division of gold minerals and gold-bearing minerals
(1) Natural element mineral
   Native gold (Au£©£¬including Au£¾80£¥£¬Ag£¼20£¥£»
   Silver gold£¨Au£»Ag£©£¬including Au80%¡«50£¥£¬Ag20%¡«50£¥£»
   Gold and silver mine£¨Au£»Ag£©£¬including Au50%¡«20£¥£¬Ag50%¡«80£¥£»
   Platinum-palladium native gold£¨Au£»Pt£»Pd£©£¬including Au84.6%¡«95.55£¥£¬Pt0¡«11.5£¥£¬Pd0¡«12.3£¥£»
   Silver Copper Gold£¨Au£¬Cu£¬Ag£©£¬including Au67.7£¥£¬Ag12.8£¥£¬Cu9.2£¥£¬Pd4.2£¥£¬Rh4.3£¥
(2) The intermetallic compounds of gold minerals refer to the natural alloy minerals that formed by two or more metal elements that mutual dissolute and form under the natural state. Mainly including:
   Wai Mine (Au, Ag) 3Hg2;
   Four copper and gold mine CuAu
(3) Gold - silver telluride minerals
    Te gold AuTe2;
     Te gold and silver ore Ag3AuTe2;
     Te pin gold, gold and silver mines, also known as needle Te AuAgTe4.
(4) Gold and silver minerals selenium compounds
     Se gold and silver mine Ag3AuSe2.
(5) Gold and silver minerals bismuth compounds
     Black Bi gold Au2Bi.
(6) Gold and silver antimonide minerals
(7) Gold and silver sulfide minerals
     Sulfur gold and silver mine (Ag3Au) 4S2.
The native gold and its variants (silver gold, gold and silver mine) among the above mentioned gold mineral are the most widely distributed and they are also the most important industrial mineral of gold.


¢ò. Gold extraction
The extract of gold can come from gold and lode gold. The production rate of lode gold keeps at 75%-85% and gold keeps at 15%-25%
1. The frequently-used ways to choose Placer mine
The primary golden ore reveals the surface, which causes the carry gold mineral lode or the carry golden rock break gradually into rock debris and pieces and so on, as a result of the machinery and chemistry weathering. Then, the external force of transporting and sorting causes the bigger mineral (e.g. golden grain) to deposit in the hillside, the river bed, and the lake seashore shore place, forming certain gathering, which has the industry exploitation value. This is called Gold deposit.
Gold deposit, usually employ gold dredger mining, hydraulic mining excavators and underground mining (shaft) mining and so on.
Gold beneficiation process includes preparatory work before sorting and sorting operations. Preparation work is mainly composed of two processes screening of granular. Granular recovery of ore is mainly to dissociate particles and clay mineral mud in the mineral. Screening is the screening of coarse free gold. Screening is commonly used in flat screen. The commonly used Equipment is flat screen, screen cylinder, and cylinder scrubbing machine. Sorting of gold is using gravity separation method, which is mainly because of gold proportion (average 17.50 ~ 18.0), and coarse particle size (usually 0.074 to 2 mm), and is due to the simple method of gravity separation. Re-election equipment is commonly using types of chute, jigger and shaker (commonly used in the selection).
2. commonly-used gold ore beneficiation methods
Because of the nature of gold ore types are different, methods used in mineral processing are different, but the commonly used are re-election, flotation, mixing mercury, cyanide and the resin slurry CIP adsorption, heap leaching of gold in recent years. To certain types of ore a joint process is often employed.
There are a lot of methods to select the gold in practice, but the commonly used ones are as follows:
1. mixed mercury only
This process is suitable for dealing with coarse-grained native gold in quartz vein ore deposits and oxidation. Gold extraction by amalgamation is an ancient and universal payment method. Mixing mercury still occupies a very important position in the modern industrial production. As the gold in the ore is often isolated and appears in a free state, a part of gold grains in ores can be recovered by amalgamation. Practice shows that the selection process using mixed mercury to recover a part of the gold particles in advance can significantly reduce the coarse gold in the tailings loss.
Gold extraction by amalgamation of the theoretical basis for the mercury to the gold particles can be selectively wetting, and then to the wetting of the gold particles in the diffusion.  Water as medium in the slurry, when the mercury surface in contact with the gold particles, the contact of gold and mercury takes the place of the original surface of gold and water, thus reducing the surface energy, and also destroying the prejudice gold hydration in contact with the mercury film. At this time, gold particles along the surface of mercury make surface energy reduce. Then the internal diffusion of mercury to the gold particles form a mercury compound - amalgams (mercury ointment).
Amalgamation of gold France is divided into inner and outer amalgamation. The amalgamation equipment is plates, mixed mercury chute, trace mineral machines, cartridges and special amalgamation of small ball or rod mill.
Amalgamation method is simple, easy to operate and of low cost. But mercury is toxic and harmful to the human body. Therefore, the use of mercury in gold extraction of mineral processing should be strictly observed with the safety technical operation, to limit the mercury vapor and metal mercury on human health to the minimum.
2. Amalgamation---- Re-election of the joint process
This process is divided into two re-elections, which is for handling the simple gold-bearing quartz vein ore and for handling large gold particles whose surface oxide film is contaminated and difficult to be mixed with parcels of mercury and the low gold content of gold ores.
3. Re-election (Amalgamation)-Cyanidation process
This process applies to the handling of gold-bearing quartz vein ore oxidation. First ore is re-elected, in which the gold is produced and the gold can be used to employ the amalgamation of mercury concentrates or the original mineral is directly mixed with mercury ore, tailings, grading ore, sand cyanide, respectively.
4. Flotation process
This process applies to the handling of smaller gold particles and high floatable sulfide ores and quartz veins of gold-bearing polymetallic sulfide ores and carbon (graphite) ores.
5. Amalgamation---- Combined flotation process
The amalgamation process was first used in the recovery of coarse gold ores, flotation tailings mixed with mercury. This process applies to the handling of a single flotation treatment of ores, gold-bearing oxide ores and free gold ore. Using this process can achieve a higher recovery than a single high-flotation process.
6. All slime cyanidation (Direct cyanidation) process
Gold is output in the state of micro-fine gold in the quartz vein ore, therefore the ore oxidation is deep, and the gold does not contain Cu, As, Sb, Bi and carbon materials. Such kind of mineral can be applied with the whole ore cyanidation process. Using this way can achieve a high recovery rate and have the advantages of ore adaptability and producing gold right here, so it is widely used. Cyanidation is composed of four steps: the gold-bearing ore merging from cyanide solution leaching, the separation of residue containing gold and leaching residue, Leaching of gold precipitation, and the melting of gold mud. The disadvantage of this method is that cyanide is highly toxic, polluting the environment. In practice, environmental protection and governance must be strictly carried out.
7. Flotation-- Cyanidation process
1) Flotation-- Cyanide process. 
It is suitable for processing gold and sulphide gold-bearing quartz veins close symbiotic ore and quartz pyrite ore.
2) Flotation¡ªRoast-- Cyanide process.
The process applies to the handling of hazardous with floatability of minerals in cyanide, and gold is only a small amount of mineral combination with this mineral.
8. Flotation-- Re-election of the joint process
This process is mainly using flotation for gold and sulfide, which can only be used in close symbiosis recovery of gold ore smelting. And it also applies to non-uniform coarse cloth embedded tired bearing quartz vein ore, and get a higher recovery than a single flotation.
9. Heap leaching
Cyanide heap leaching is a type of gold extraction, which applies to the handling of lower grade gold ore. The main advantage is that it is a simple process with low investment and low cost.
The nine above processes are the principle process whose internal structure should be handled by the type and nature of ore vary.
No matter what kind of ore it is , as long as it contains coarse gold, it should implement the principle of early to collect more revenue. Before the ore comes into the flotation operation, it should be re-elected respectively, mixed with mercury or single flotation and should be recovered with coarse gold in a timely manner.


¢ó. The function of gold
Gold has used for industrial technology for only a few decades. With the rapid development of modern industry, agriculture, aerospace electronics industry and information technology, new energy, new materials, the applications for the gold is opening up a wide range of fields. As Boyle put in Geochemistry of gold and gold deposits, years after 1950 are ¡°Gold's industrial period¡±.
1. Application in Electronics Industry
Since gold has excellent stability, good conductivity and performance, gold in the electronic industry is more and more widely used. Space technology development requires a high degree of stability in an increasing number of radio electronic devices, such as high vacuum tubes of paint, special purpose electrical connectors, special precision electronic instrument in drawing wire, gold plated conductors and high-temperature and high-frequency welding gold alloy. The coated gold integrated circuit is used in the computer, radio, TV, tape recorders and so on.
2. Applications in the chemical industry
There are also unique uses in the chemical industry, such as nuclear materials used in chemical plants, man-made fiber spinning class factory alloys used in first class.
3. In Aerospace Industry
Gold is also developing and expanding its use in the aerospace industry. Aircraft and other space vehicles use the gold-plated and heat reflector infrared devices, jet engines and rocket engines use a painted gold heat shield or heat shielding plate, and airplanes, cars, ships and other modes of transport are all equipped with a thin layer of thermal block glass coated with gold.
4. Application in traditional industries
Denture business, photography, pen and other traditional industries, the application still has some gold consumption. Gold in the application of science and technology is in continued development. In Japan, Hung Leung in an Atomic Energy Research Institute in a University found that crystal packing may constitute a superconducting thin film. As is expected, with the development of science and new technologies, areas of applications in gold are expanding.

Our Needs£»
We have a large and professional factory to select gold and we have a big demand for gold and gold ore.
Our investment will be carried on according to the following conditions:
1. Direct investment: We will invest and exploit to the gold deposits that have already been obtained permission to invest in mining.
2. Equity: We presume one of the most effective way for cooperation is to invest in shares of gold mining development
3. Direct trade: transact with us export mineral to China, recycle smelting in China
4. Capital involved in the transaction: we can also provide commodity trade finance to settle a bargain.


Suppliers who have this kind of mineral product are welcome to consult our purchasing representative.


Lisa Lee
Tel£º   0086-755-86241263
Phone£º0086-0-18923810785
E-mail£ºlisaseek@gmail.com
QQ£º972034832 
MSN£ºzgzg1125@hotmail.com
Yahoo£ºyingying11255@yahoo.com
Skype£ºlisaseekcn

       ¡¾Print¡¿¡¾Close¡¿
  Homepage  |   Recruitment  |  About us  |  Contact us  |  Privacy statement  |  Links  |  <%if session("username")="" then response.write"Login" else response.write"welcome: "&session("username")&" Union center" end if %>  |  E-mail  |  Collect

Copyright © 2006£­2012 Artworldcn enterprise Ltd All Rights Reserved