2012年5月4日星期五

Gold Mining Process

Gold mining process involves the science, technology, and business of the discovery of gold, in addition to its removal and sale in the marketplace. Gold may be found in many places, most commonly rock but even sea water; in very small quantities. More often it is found in greater quantities in veins associated with igneous rocks, rocks created by heat such as Coal Mining Process.

Since the costs can be high in the exploration and removal of gold from the hard rock mines, large companies are created in order to raise the money necessary for the development of the mines, rather than the solitary individual or small group associated with placer mining.

Mining process is only worthwhile financially where there is a significant concentration of it found in Iron Ore Mining Process.copper ore mining equipment in Philippines The fixed price of gold in 1934 increased from $20.67 U.S. to $35 U.S. per troy ounce. This price remained fixed until 1968 which discouraged hard rock mining for gold because increased inflation (which raised the cost of mining production) prevented the mining companies from making a profit.

After secondary crusher, a shaker screen filters out fragments of less than 1/2 inch diameter into a fine ore bin, or box. Larger ore fragments are pulverized or crushed in the crusher. The fine ore is fed by conveyer belt to a ball mill,copper ore mining equipment in Mexico a rotating steel cylinder filled with tumbling steel balls which further crushes the fragments to a consistency of fine sand or talcum powder. This powder is fed into a thickener with a cyanide and water solution to create a sludge (a sticky, mud-like material). The liquid sludge is diverted into holding tanks and referred to as the pregnant solution - a liquid sludge containing 70 percent of the gold.

Before hard rock mining operations have even begun, companies explore areas where gold may be found and scientifically analyse the rock. The actual gold originates deep within the earth in places called pockets. These pockets are filled with gold, heavy ore, and quartz.copper oremining equipment in Sudan If enough gold is discovered in the ore, the technological process of hard rock mining begins.

First, miners dig a tunnel into the solid rock. During the 1930s, miners working for the companies dug these tunnels by hand, a very labour-intensive undertaking. Miners often risked their health, digging with picks and shovels during long shifts in these dark, damp tunnels, building the shafts and carting out the ore.

Most injuries underground involved falling rock, slips, and explosions, but the workers also had to inhale dust into their lungs in this era before safety regulations, safety equipment, and improved ventilation. The miners were willing to take the risks in order to provide for their families.

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