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Text Chapter 1648 Natural Gold

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    Since there are gold mines in the upper reaches, let's go look for them. As for some gold sand that still remains in the river, we can only send professionals to come out. After all, Han Kongque and the others are almost vomiting while carrying the gold bars.  In a whole vein, it is naturally impossible for all the gold to be piled together, so it is necessary to detect and find the main vein. In the later stage, it will be slowly mined and smelted. ?? Han Peacock will definitely not participate in the later mining. He is only interested in finding gold mines.  The group of people walked upwards along the underground river, checking the surrounding ores as they walked.  I don¡¯t know where the downstream gold sand washed down from. Although there is a long stretch of river in the middle, it also contains a certain amount of gold, but the gold content is not high. Of course, the taste is borderline taste.  Gold ore grade is the ratio of the amount of metal and concentrate contained in the gold ore. It is a percentage and refers to the enrichment of useful components in metal deposits and some non-metallic deposits (such as apatite, potash, fluorite, etc.)  Degree and unit content are the main indicators to measure the quality of mineral resources.  Usually expressed in %, g/ton, g/m3, g/L, etc.  The grade of ore determines the development and utilization value of mineral resources, the direction of processing and utilization, and the production technology and process flow.  Based on the content of useful minerals, mineral products are divided into three categories. The first category is the cut-off grade.  This is the lowest grade that divides the boundaries between minerals and non-minerals, that is, the lowest grade that delineates ore bodies. Any rock or mineralized rock that does not reach this indicator has no mining value.  The next step is the average grade, which is the total average grade of ore that reaches industrial reserves in the ore body, ore section or entire mining area, to measure the richness and poverty of the mineral.  Only when it reaches industrial grade, or critical grade, can it truly reach the indicator of large-scale mining.  Industrial grade ore refers to the lowest average grade of industrially available ore sections or ore bodies, that is, the lowest grade that is technically possible and economically reasonable for development and utilization under the current technical and economic conditions. ? Generally, ores with high grades are called rich ores, and vice versa are called poor ores.  The higher the grade of the mineral, the greater the utilization value, and the better the various production technical indicators; the lower the grade, the smaller the utilization value, and the worse the various production technical indicators.  Of course, different mineral resources have different requirements for their grade. For example, in gold deposits, the gold content of gold ore varies greatly. Currently, gold ore with mining value is 03-05 grams per ton or more.  Nowadays, the average grade of most domestic gold mines is 5 grams or even less than 2 grams (g/ton). It used to be higher, but now there are very few rich ores.  The average grade of gold ore abroad, especially in Africa, is generally between 2-15 grams, but some mines can even reach tens or even hundreds of grams.  Using cyanide to extract gold, the recovery rate of general gold mines can reach 95% or even more than 98%, so how much gold can be extracted from one ton of gold ore is the grade multiplied by the recovery rate.  Now Han Kongque and the others have discovered that these poor-grade gold ores contain only about 0.3 grams of gold per ton of ore, so they are valuable for mining, but they are really not of much value.  "Where did all the gold sand downstream come from? Why is the gold mine here so low-grade?" Zhou Meiren glanced at the test results and frowned.  "Keep going up! There must be rich ores up there." Han Kongque said.  "Huh? What do you think this is?" At this moment, Mu Ling said.  Since it was impossible to see anything in the cave, and Han Peacock only focused on walking forward, he never looked at the stones on the ground.  At this time, due to the angle of the miner's lamp, the light shone on a stone on the ground, and the reflected color surprised Mu Ling.  "This is" Han Peacock looked surprised in the dazzling golden light.  "Haha, this is gold, and it is a natural gold nugget." The golden demon smiled and picked up the gold.  Zhou Meiren squatted down in disbelief and stretched out her right hand. When her fingers touched the cold rock of the stone pillar, she was convinced that her eyes were not deceived.  "This is really gold!" There was a lot of gold sand found down there, so Zhou Meiren thought that the gold here should not be able to form natural gold. Unexpectedly, after searching for a while, she found natural gold.  "Is this the so-called nugget gold?" Huangshan also said happily.  Han Kongque said: "Yes, it's nugget gold. I thought we could only collect gold sand here! I didn't expect to find such natural gold." Natural gold is a naturally occurring gold element mineral, which is produced from vein minerals.  Or natural gold nuggets from placer mines, also known as dog-head gold because their shape resembles a dog's head, often contain silver or trace amounts of copper and equiaxed crystals.  Generally in granular or irregular formThe dendritic aggregates, individual blocks can weigh tens of kilograms, are golden in color and streaks, with metallic luster, so they look particularly eye-catching under the light.  ¡°This piece is actually round, it¡¯s rare!¡± Zhou Meiren said happily.  Han Kongque said: "It is rare. Only in 1981 was a rare round natural gold found in Connecticut, USA." "The main thing is the color. Such a brilliant yellow must have a high gold content." Zhou Meiren said.  Her family owns a jewelry company and is very familiar with gold. The color changes of natural gold are related to the fineness of the gold. Gold with high fineness is dark yellow-yellow and has a light red tone. Gold with normal fineness is dark yellow, yellow and yellow.  White, light green gold with low fineness.  This piece is obviously golden yellow, and it is considered the best natural gold, especially the shape. Such round natural gold is even rarer, and it is considered a very precious natural ore specimen.  "There is no need to use such treasures to refine gold bars. I heard that such natural gold is more expensive." Huangshan said with a smile.  Jin Yao also said: "Nut-headed gold is a symbol of good luck. We found nugget-headed gold, which means that our luck is strong." "Finding so many golden sands doesn't mean good luck?" Mu Ling said.  "Haha, you will always have good luck when you follow the boss." Huang Shan said.  "Boss, look at this, is it also gold nugget?" At this moment, a female bodyguard following Zhou Meiren came over.  Looking at the light green ore in his hand, Han Kongque was speechless. Although the gold content was a little low, it was definitely a piece of natural gold.  "Look here, the rocks here seem to be a little colorful." Before Han Peacock said anything, another bodyguard of Zhou Meiren directly used the lamp in her hand to lead Han Peacock and the others into a gorgeous world.  .  The scene in front of them made Han Kongque and the others stunned.  Just where the light shines, a light yellow light shines on a rocky beach not far ahead. One of the giant rocks is covered with golden particles.  This is not the most important thing. The most important thing is to randomly scan it with a miner's lamp. All nearby stone pillars and rocks, including gravel on the ground, all have this golden color visible to the naked eye.  Walking closer, Han Peacock randomly picked up a few gravels from the ground. How could these be "gravels"?  It's just a little golden bean with low purity.  "No wonder there is so much gold sand down there, and there are so many natural gold nuggets. It's no wonder that as time goes by, it won't corrode so much gold sand." Han Peacock murmured to himself.  "Boss, look at the top of your head. All these gold nuggets have fallen from the surrounding walls." At this time, the second female bodyguard who discovered the nugget of gold shone the light on the top of the cave again.  The most dazzling thing is the golden light, followed by yellow, red, and green. The various colors are intertwined together, making the cave become illusory.  "This is a golden cave!" the golden demon shouted.  It¡¯s no wonder he was excited. You have to know that there are very few real rich ores in the world now. It was unusual to find so much gold sand, but now so much natural gold can be found.  You must know that the abundance of gold in the earth's crust is inherently low, and it also has properties such as sulfur affinity, chalcophilicity, iron affinity, and high melting point. Therefore, it is thousands of times more difficult for gold to form such an industrial deposit.  "To form large ore rich deposits like copper and iron, gold is thousands, tens of thousands, times more difficult, or even higher. It can be seen that its large-scale gold mines generally have to go through a long geological period.  But what do they see now?  Everything you can see is high-purity gold ore that can be seen with the naked eye. This is more exciting and shocking than winning a billion-dollar jackpot!  After the shock, Han Peacock and the others hurried over. Everything they say now is false. Only by personal testing can they confirm that the harvest here is real.  Although it is golden here, it may be pyrite or directly chalcopyrite. If this is the case, then the joy will be in vain.  From here, along the way, Han Kongque not only observed the direction of the rock formations of these gold ores to see how long they were, but also kept picking out some scattered gold ores for testing.  People brought by Zhou Meiren will do the tests, and Han Kongque and the others only need to collect specimens. ?? Han Peacock and the others walked forward for one kilometer, and the gold on the cliff was not less at all, and the purity was even getting higher and higher. Later, when the miner's lamp shone on the cave wall, it was directly golden.  Seeing such a scene, even Han Peacock began to have trouble breathing.  This stimulation lasted for hundreds moreAfter a few meters, it slowly became dull.  Mainly because the golden color on the cave wall became lighter and lighter. After walking a few dozen meters further, the rocks on the cave wall became normal, black and glowing with metallic luster.  "It seems that this underground mine is not only rich in gold, but also has a very high iron content." Han Kongque said.  "There are many associated ores in gold mines. It is normal to have iron ore. I just saw a piece of green ore, which should be copper ore." Zhou Meiren said.  "I hope the ores we picked up just now are not chalcopyrite." Han Peacock said with a smile.  
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