How To Extract Gold From Rock
Generally, differing kinds of gold ores are extracted in an exceedingly general open and underground manner.
Extracting ore from open mines is way easier and might be through with lower investment and operating costs.
About 65 percent of the gold ore within the u. s. is currently extracted in open mines and 35 percent in underground mines.
The most important factors determining the selection between open and underground mining methods are the prices of extracting the ore and recycling. In open mines, since the value of disposing the tailings and separating the tailings within the reserve are extraction costs, therefore the ratio of tailings to the ore extracted may be a factor for comparing extraction costs.
Therefore, the ratio of tailings to the ore extracted is employed as an element to check the prices of opencast and underground mining.
Gold is one amongst the foremost valuable and valuable minerals. additionally to its decorative uses, monetary support in an exceedingly country’s industry are often very effective in curbing inflation.
Therefore, the identification and exploration of gold reserves eliminated inflation, even immediately. But the implications of this importance are going to be evident when it is processed and extracted from the ore.
In many parts of the planet, local people still extract gold and it’s sold locally as raw gold.
The aforementioned process is dole out through mechanical and manual processes like washing (gravity separation), grinding and mashing.
Incorporation is performed by passing a slurry of crushed gold ore over mercury-coated copper sheets.
The resulting gold grain is periodically separated from the cache, very fine gold particles can’t be separated by these methods, and in many cases, especially in Brazil, a cyanide method has been proposed to extract the remaining gold.
When gold covers an oversized area in river sand. The metal is definitely mined and processed with floating dredgers. for instance, this method of mining is employed in Siberia and North America.
More than 90% of the gold ores in Western countries are primary gold ores, which are mainly mined underground.
In African country and Canada, 100% and 70% of the mines are mined underground, respectively, but within the u. s., about 3.5% are mined underground and also the rest are open pit. In underground mining, including ancient and modern methods, it’s mined. Gold is as follows:
Digging and blasting
Cutting and filling stops
Square set stops
Most of the underground mines are located at shallow depths (from one to four kilometers) and in South Africa about 250,000 heaps of rock are mined per month, over 125 kilometers of tunnels are excavated annually and quite 8,000 people have a miner. The gold veins of this mine are at a depth of 10-30 cm.
Important issues in underground mining are high temperatures, rock bursts, and problems with using mechanical devices.
As the cost of transporting the ore from the depths to the surface of the mines may be a great amount of the extraction cost, during this sort of mines a shot has been made to separate the waste stones from the most rocks within the basement the maximum amount as possible.
Chemical Method In Gold Mining
In the chemical method, gold soil is dissolved in acid to make gold chloride. After the gold is dissolved within the acid, the answer must be filtered to get rid of soil impurities from the answer.
Then the dissolved gold is precipitated with materials like sodium metabisulfite, and as within the process of recycling electronic components, the gold powder is washed, dried and eventually melted. This method has low efficiency for various reasons.
Drilling Method In Gold Mining
In the formation method, gold soil is mixed with flux, which may be a combination of boron, silica (silicon dioxide), washing soda, silver or copper as a gold complex, and so it’s melted in an exceedingly vegetable kiln or furnace.
This method removes many troublesome substances, the annoying metals are oxidized and become slag, and eventually the silver or molten copper is cooled which absorbed the gold within the style of alittle ingot.
Then the slag is separated from the silver or copper alloy, and also the alloy is dissolved within the acid to get the gold from the acid.