Know when discovered gold for the first time, but it is clear that humanity since ancient times has been estimated that the value of gold. The combined gold gods for some people, so they have had a special place. Archaeologists have found the cups and gold jewelry, manufacture date back to 3500 years BC. M, made by the people of the ancient civilizations of Ur in Mesopotamia (now Iraq). Jewelry also found in the tombs of Egyptian Pharaohs dating back to the same period of time. The ancient Egyptians believed that gold is the metal gods and all the gold was for the pharaoh. Since those ancient times kings wear crowns of gold. The gold is present in abundance in the land around the Mediterranean. The people making Mseni Greece cups decorated with gold handles. Archeologists have found such cups in the tombs of the kings buried in 1500 BC. M. Almost. The use of China's population, and Crete, India, Persia (Iran Today) gold to make beautiful things such as dishes, bowls and cups. In some cases, covered with gold hilts. And a little of the work of Roman gold remained. He was buried at times rich treasures of gold and silver in times of war. At present, people extracted some of these treasures. Roman coins have been struck and the rich of them to wear gold jewelry .. How to be gold Scientists believe that gold may be the deposition of the gases and fluids rising from the bottom surface of the earth. These gases and liquids rise in the direction of the surface through cracks in the earth's crust. There is gold in abundance in the rocks forming the crust. There is often with metallic copper and lead. Often, researchers first mixed for gold between the ore which they found a Alberait, a compound composed of iron and sulfur. Because it looks like gold, but without a value, known as gold stupid. It is rare to find a piece of gold large enough to see them, although the large rocks of gold had been found in Australia in the late nineteenth century. There is gold in the veins of metal, and in alluvial deposits or as an element of porphyry copper as well as in sea water. Deposits of mineral veins. Are the veins in the earth's crust. Sandy or alluvial deposits. Large particles, called nuggets or grains of gold, are found in river beds. These particles washed away by surface water or flood water and its campaign away from the metal race. And some very large fragments. Fragments and the largest discovered so far is O hello stranger, which is found in Molijul Victoria, Australia, in 1869, which concluded, including 6992 kilograms of pure gold. Before that, eleven years old, I discovered the block another gold in Ballarat Victoria, Australia, and concluded, including 68.72 kg of pure gold. The largest recorded cluster globally containing gold, are found in the End Is in New South Wales, Australia in 1872, a piece of slate and gold reached a height of 145 cm and 38 cm display and weighed more than 235 kilograms of pure gold. But did not record a block real gold, because it was a mixture of slate and gold. The alluvial deposits are of two types fragmented and mud, and soon there is the first type of gold veins, and the second is far away from her, often in river beds. Some gold is found in large deposits of copper deposits called porphyry copper. Gold in sea water. All sea water containing gold solution. The result of sea water 72 milligrams of gold per metric ton. And scientists looking for ways to profitably mined. It is rare for the presence of gold in pure form, but is often accompanied by silver in the alloy naturally called electrum, and is usually coupled with quartz or calcite, or lead, or tellurium or zinc or copper, and is often mined as a by these metals. For example, only 40% of gold mined in the United States, is extracted from the sites may be true to name the gold mine it .. How to prospecting for gold .. Different ways depending on the type of gold mining sediments. Are two steps to get gold instruments necessary are: 1 - to obtain crude 2 - separate the gold from the ore. In most mining operations in the alluvial deposits are two processes in the sediment sites. In the case of underground exploration drilling is raw, then transferred to separate the mills and the focus there. Are prospecting for sediment or mineral veins under the ground in the same way that are out prospecting for coal, and miners up to the gold digging trenches in the ground Mtaatbain vertical orientation, race, and there are some gold ore is excavated on the surface of the earth. Breaks the rock put explosives inside and drills, and then taken into the rocks containing the gold mills. All excavations in the alluvial deposits in the base is only a screening process are heavily (gravity separation). In the olden days, the miners use the alluvial deposits of metal buckets Kalmqlap to separate the gold manually after washing. They were separated water and gravel from the pot in a circular motion, leaving the gold in the pot. But usually used excavators scoop for the collection of gravel in the rocker seating approximately 0.2 m from the article and § Igslonh, then swept up Ihezwnh and light materials to be left alone is gold. Giant hydraulic. It helps to pump the water and push firmly to the ruins of gravel containing gold Wegervh vessels to have grooves gold reserve. Crane (Dardj). Machine is drilling for gold-powered and consists of a number of buckets installed on the boat, and every bucket capacity of 0.2 m §. And lowered in buckets of water on the jib and spin in a circular motion (Calcakip) to lift the silt from the riverbed. Lift and carry equipment to separate the gold from other materials. Prevents many of the country both from exploration or mining hydraulic crane; because they are damaging land and rivers. The crane used in the past in New Zealand and California in the United States and used widely in the Soviet Union (former). Cranes clouds of sin, often called the linear tractors, and consists of buckets attached in the form of lines and pulls heavy drag along the bottom of the river for the collection of alluvial gold. Scoop mechanism. A machine that huge gathering of large quantities of soil, silt and gravel containing gold from river beds. Scoop It works with other devices to separate the gold from other materials, is done at the site of sediment. Milling process There are three methods used to separate gold from raw materials or sea water, namely: buoyancy, and cyanide, carbon and pulp. Buoyancy. Excreted in the flotation process (the process of flotation) fine particles of ore milled from each other, based on the ability of different metals in the raw associate themselves with oily foam. Mix oils and chemicals called buoyancy factors that mixes with water before the raw powder, and used three types of chemicals: the agent foam agent and collector and a variety of inorganic chemicals. Working cause foam in the water, puffing, and the Group of the Whole on the gold layer to make it stick to air bubbles that float on the surface, while the non-organic chemicals, other metals turn off the spigot of the composition of the class that was dressed with the gold. After the development of raw water, air enters into the solution, and this process is called ventilation, and thus bear the gold particles to the top of the class and Takect foam. Cyanide method. Contains a process to develop the raw powder in the tank contains a dilute solution of cyanide, and then separating the gold in solution or deposited metal zinc. The method was used for the first time in South Africa in the nineties of the nineteenth century, a very effective method extracted 90% of the gold with crude oil, and using this method can extract gold from piles of waste material extracted from gold mines. Pulp carbon. It's another way you need to use cyanide. And is the first rough mix the powder with water to get to the door, and then dissolved content of gold in cyanide solution. The carbon particles are added to his door to collect gold ions (electrically charged atoms) on the surface. And then continues to carbon particles from the pulp, the particles are then placed in a solution of cyanide alkaline (caustic) hot which in turn separates the gold from the carbon. Properties of gold .. Gold has a high value over the years, mainly due to the rarity. But gold owes much to its physical and aesthetic, and Ionth, and resistance to chemicals as well as for density. It is a beautiful yellow color, luster and breathtaking, and easily filled because of this Ionth. And is described by scholars as Lynn retractable; and that the possibility of withdrawal in the form of thin wire for easy styles, and conversion to thin plates. As can be customized to any body required. After its formation, it keeps Beraiqa, the ability to resist rust and other chemical changes caused by the air. It must be the gold is mixed Pflz another if we are making him a solid object like a piece of jewelry for example. This mixture is called a slug. The gold bullion is measured by carat, and carat is equal to one of the twenty-four parts. Thus, the 24-carat gold is pure gold. And 18 carat consists of 18 parts of gold and 6 parts of another metal. And pure gold melts at a temperature of 1,064,43 ° m. And boil at a temperature of 2,807 ° C, and belongs to the group (1) periodic table of elements. The atomic weight is 196,967, and atomic number is 79. And intensity equivalent to 19.32 gm / cm § at the temperature of 20 ° C. And can be dissolved in a mixture of acid, chlorine, nitric and aqua regia named. . And also can be dissolved in solvents or alkaline cyanide solution in the hot iron chloride triangular, or a solution Altheosalafit or mercury or chlorine newborn .. Gold is a metallic chemical symbol (Au), one of the elements known since antiquity. It was possession of gold, turquoise, yellow, bright and attractive sign of wealth for thousands of years. The ancient Egyptians knew how to knock on thin sheets of gold, to the point where we need them for nearly 367 000 a plate to obtain a thin sheets with a thickness of 2,5 cm. During the Middle Ages, grew up fully aware of the stand-alone so-called alchemy as a result of attempts to make gold in ways artificial. The Modern scientists have succeeded in achieving some of the old dreams of chemists. In today they could extract gold from sea water, and particle accelerators can install the gold from lead and mercury. They can also be made accelerators is a kind of stable gold made of platinum and iridium, both higher than the value of gold. However, most commercially produced gold still comes from the earth. And gold-mining industry on the task of carefully supervised by the governments of producing countries ..
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