One day in June 1997, the workers of the 13th Gold Mining Team of the Sigou Gold Mine in Menyuan County, Qinghai Province, as usual, took the shovel to the side of the bunker in the Blackthorn Ditch. Under the scorching sun, the worker Xiao Liu sweated and the other workers repeated the same labor. There is no wind in the black thorns, the sky is cloudless, and the feet will feel hot when you step on the ground. Suddenly, something strange appeared in the sand of his shovel. When this red dragonfly entered people's sight, the workers couldn't believe their eyes. It turned out to be a dog's head gold weighing 6577 grams.
Liu Jiajun, a professor at the School of Earth Sciences and Resources at China University of Geosciences (Beijing), told reporters that dog gold refers to gold nuggets that are naturally produced, with large particles, irregular shapes, and impure texture. It usually consists of natural gold, quartz and other mineral aggregates. Some are like dog heads, called "dog head gold", and some are shaped like horseshoes, called "horsehoe gold." But people often refer to this natural gold as the dog's head gold.
So far, although more than 8,000 pieces of gold are found in the world of more than 10 kilograms, the output is still quite rare, and it is not easy to get it. In addition, the price of gold is expensive, so it is regarded as the treasure of the treasure.
The development of the dog's gold watch is due to be discussed
There are three main reasons for the origin of the dog's head gold, namely, the expression of epigenetic chemical hyperplasia, the theory of bio-concentration and the effect of freezing and enrichment. Although the three genesis differ in the formation mechanism, they all emphasize that the doghead gold is formed in the epigenetic environment.
However, Professor Liu Jiajun and his doctoral student Li Zhiming have questioned this cause.
Their paper published in the Journal of Geology and Exploration (No. 2, 2002) pointed out that if the gold-headed gold is further accumulatively polymerized under superficial conditions. So why is there no gold for the dog's head in many gold deposits? Even if a piece of gold is accidentally present in the fine grain of gold, its blockiness is several thousand times or even tens of thousands times larger than the surrounding gold particles, but why is it in the same environmental conditions? Underneath, the small natural gold grain shape around it is not a dog's head gold. Is this doghead gold uniquely localized? This is obviously difficult to explain with the ore-forming theory in the epigenetic environment.
In addition, if the dog's head gold is formed in the epigenetic environment, it should have a phenotypic characteristic regardless of the manner in which it is polymerized. In fact, the dog head gold produced in different parts of the world has different forms, and there is almost no dog head gold in the same form.
Large gold in the original gold ore body
Dog head gold was also found in some of the original gold mines. For example, a large piece of pure gold was found in the quartz veins in the Kurgadi area of ​​Western Australia; a gold-gold aggregate was found in the Dongtun mining area in Hunan’s Zishui area, weighing 40 kilograms, and the total amount of gold extracted from it was 4.35. Kilograms; slag-like natural gold polycrystalline aggregates weighing 30 grams and 63 grams were seen in the quartz crystal cavity of the Changlangping gold deposit in Changde.
There are also many examples of large crystals of natural gold found in primary ore. For example, the maximum gold particle size of natural gold in the Martial-Loud gold deposit in the United States can reach 30 cm. Natural gold crystals found in mines in many mines in Ural. It is about 1 ~ 8 cm long, and the plate-like dendritic natural gold crystals in the gold deposits in Romania and other countries can reach 10~100 cm. The cubes of 3.8~12 cm long are found in a gold mine in the former Soviet Union.
Chen Shuhan and other scholars from the Institute of Geology and Mineral Resources of Shenyang have pointed out that there are some gold nuggets in the dog gold, some of which may be formed in the secondary enrichment zone of the primary gold deposit, rather than in the valley environment under superficial conditions. .
It is found that the large particles of natural gold in the Xiaohe Liehe Venture Gold Mine in Jiayin County are 5~20 mm long. Most of the natural gold gold particles are born together with the vein quartz , and sometimes they are interspersed with each other. Obvious native features.
Dog head gold color does not conform to the principle of birth
In the view of Dr. Li Zhiming and other scholars, if the dog's head gold is formed by the chemical proliferation under the conditions of epigenetic conditions, then according to the fact that the gold formed by the hyperplasia under the epigenetic conditions should be pure gold, the color of the dog's head gold is Above 950.
However, according to the relevant statistical results, the common color of dog gold is only 800~900. For example, the large gold nuggets produced in the head of Jintou, Konglonggou, Baiyu County, Sichuan Province, are considered to be chemically increased, but their color is only 700~840; the same color produced in Changtai is only 700~906.
In addition, the world's largest dog head, named Holtman, weighs 285.77 kg and contains 92 kg of pure gold. Its gold content is only 32.2%. It can be seen that the formation of the gold of the dog's head is difficult to explain by the viewpoint of the nugget formed mainly by chemical proliferation under the conditions of epigenetic conditions.
Found that the dog gold is good for finding the original gold mine
In view of the above objective facts and the formation of a series of doubts that cannot be satisfactorily explained, Dr. Li Zhiming and others have divided the dog head gold that people have seen into two categories, namely, the original type and the original type.
The large gold and natural gold giant crystals produced in the endogenous gold ore are native gold nuggets, and the dog gold produced in the epigenetic environment should belong to the original modified gold. That is to say, the large gold and gold giant crystals produced in the primary gold ore body are exposed to the surface of the earth, weathered and disintegrated in the oxidation zone, and under the action of gravity and mechanical transportation such as rivers, floods or glaciers. It is deposited in a suitable surface environment such as a valley or a riverbed and further subjected to transformation.
Therefore, the dog gold in the epigenetic environment is formed by the transformation of the original nugget under epigenetic conditions and finite proliferation. From this it can be inferred that in the gold deposits where the dog's head gold is developed, there should be or at least ever existed native gold-rich aggregates. Therefore, the discovery of the dog's head gold is undoubtedly the most direct indication of the search for the original gold ore body.
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