الأحد، 12 يونيو 2016

Gold mining

From Wikipedia, the free encyclopedia
"Gold mine" redirects here. For other uses, see Gold mine (disambiguation).
Super Pit gold mine in Western Australia
Gold-bearing quartz veins in Alaska
Gold mining is the process of mining of gold or gold ores from the ground. There are several techniques and processes by which gold may be extracted from the earth.
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GOLD AND INVESTMENT

Janet Yellen holds the key to what comes next.

Updated from Feb. 9
The stock market is having a horrible time so far in 2016, with the S&P 500 down more than 9%. Gold, on the other hand, is up nearly 10% year-to-date and hit a four-month high of just under $1200 per ounce on Monday before dipping 0.7% Tuesday to $1189.30. (Update: Gold surgedto as high as $1,242.26 an ounce Thursday, the highest level since February 2015, as the dollar stumbled followingJanet Yellen’s Congressional testimony on Wednesday.)

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Why is gold considered so precious and why does it have such high prices?

Why is gold so highly valued all over the world and throughout history? What satisfaction do people get from this ridiculously expensive metal?

The main usage of gold is in jewelry but is it really worth spending such insane amount just to decorate your body? After all it is just a shiny, ductile and non-reactive metal. Do these properties justify its rates?

Isn't there a positive feedback loop in Gold's valuation i.e. more people want it so it's value goes up and since it's value goes up even more people want it and the cycles goes on?
39 Answers
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Gold Ore Processing Plant

Gold Ore Processing Plant
Most grade of the gold ore is very low, thus the ore must be processed in the gold ore processing plant.It is to get gold out of ores.In the process, many gold processing equipment are used, such as gold refining and purifying equipment,but the ore must be crushed and grinded, thus the gold could be separated from the ore by mineral separation equipment.
 

Major gold ore beneficiation equipments are including:

Major gold ore beneficiation equipments are including:
jaw crusher, cone crusher, vibrating screen,ball mill, spiral classifier,hydrocyclone,flotation machine, efficient thickener,press filter,slurry pump,feeder, agitation tank and belt conveyor ，gold leaching equipment etc.

Gold Ore Processing Plant Process:

Gold Ore Benefication Process:

1.Large raw gold ore for primary crushing are fed into the jaw crusher by Plate feeder and are reduced to 8 inches or smaller. After first crushing, the material will transferred to cone crusher by belt conveyor for secondary crushing; the crushed gold ore stone will then transferred to vibrating screen for classifying. After classifying, the parts whose size below the mesh size will be transferred away as final products, while the other parts will return to cone crusher, thus forming a closed circuit. Size of final products can be combined and graded according to your specific requirement.
2.The smaller crushed gold ore is fed to ball mill for grinding. Inside the ball mill, the crushed gold ore will grind the ore to about 0.2 mm with 3-inch steel balls.
3.This gold ore slurry is pumped to the agitation tank. This gold ore slurry is finally pumped to the flotation machine with the fine sulfide ore (~-0.074 mm) going to froth flotation cells for recovery of gold.
4.In gold leaching plant case,the following step is that thickening overflow is transported to the clarifier and thickening underflow flows into total cross-section agitating tank. Air is added by the air compressor and blower together with reagent and activated carbon. Finally, cyaniding tailings and gold loaded carbon are available after the safety screen.

Advantages：

1. In crushing, it adopts traditional two-stage and a closed circuit system for ideal fineness. Besides, jaw crushers have large crushing capacity.
2. In grinding and classification, with characteristics of large processing capacity and small floor area, superfine lamination autogenous mill can save energy by more than 85%.
3. In classification, hydrocyclone and vibrating screen can enhance the classifying effects.
4. It adopts the third generation tailings dry stacking technology, which can save energy by 60-80%. Furthermore, it can also protect the environment and build a base for green mine.

About XINHAI

Xinhai Mining Machinery Company supplies a wide range of solution for mineral process, including gold,silver,copper,iron,zinc,chrome,molybdenum,feldspar, manganese ore and more other ore materials.We could provide advanced mineral processing technique,benefication plant design, equipment production and installation instructions,and also could provide turnkey project!

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  To all interested in gold mining, there are 40 concessions of both alluvial and rock mining available in Ghana. we are looking forward to meeting investors from abroad for partnership Mr Agyapong...  

- by Agyapong
SEE ALL COMMENTS  

Gold

UPDATE: World top 10 gold producers – countries and miners

The last year has seen changes in global gold production rankings, both by country and company.
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الخميس، 9 يونيو 2016

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