Contents
Gold extraction
Gold exists in its original form on the surface of the earth and in its interior, and months extracted ores from the surface of alluvial gold, which is specifically found in the rivers and streams of water and flood plains, and formed alluvial deposits through weathering processes of wind and rain, as a result of changing temperatures rock temperatures containing gold , while Gold oxidized ore is exogenous, which can be formed through a secondary enrichment process, in which mineral elements and sulfides are gradually leaked out to leave behind the insoluble gold minerals as surface deposits, and it is indicated that natural gold is the most common mineral of gold, and contains 0.1 to 4% of Silver , which makes up approximately 80% of the mineral found in the earth's crust, and is found in the form of large lumps with a diameter of up to 12 mm, and in few cases, lumps of 50 kg are found. [1]
The weight of the gold extracted
It is noteworthy that the gold extracted since ancient times has weighed 152,000 tons, and scientists believe that there are eight times the gold that has been extracted in and under the oceans, and they expect it to also be present in the heart of the earth, which leads to difficult access, along with its very high cost. [2]
Gold carat
The majority of gold jewelry is not made of pure gold, and to measure in the jewelry piece of gold amount is used for carat (unit measuring the purity of gold), It should be noted that pure gold is a 24 - carat, and when you add metals other to less than Carats, for example carat gold 12 carat 50% of its weight contains gold and 50% of other minerals. [3]
Statistics of gold production in the world
Gold-producing countries are located in all continents of the world except Antarctica, [2] and the table below shows the five most producing countries in the world according to 2015 statistics. [4]
| Gold producing country | Production weight / kg |
|---|---|
| China | 490,000 kg |
| Australia | 300,000 kg |
| Russia | 242,000 kg |
| Canada | 150,000 kg |
| Peru | 150,000 kg |
References
- ↑ James Hoffmann, "Gold Processing " , www.britannica.com , Retrieved 20-3-2018. Edited.
- ^ A b ERIC SEPANEK (18-4-2015), "How To Is a Gold Formed And the Where Does It Come From S ?" , Www.sbcgold.com , Retrieved 20-3-2018. Edited.
- ↑ Stephanie Pappas (15-4-2016), "Facts About Gold" , www.livescience.com , Retrieved 20-3-2018. Edited.
- ↑ "Global Gold Mining Production" , www.usfunds.com , Retrieved 20-3-2018. Edited.
