Coal is divided into: anthracite, bituminous coal, lignite and peat; Strictly speaking, peat is not considered coal, but only in its original form, not as a fuel.

Among them, bituminous coal is also subdivided: gas coal, fertile coal, coking coal and lean coal, lean coal, weak sticky coal, non-sticky coal, long-flame coal, etc., which are used for steelmaking, gas refining and fuel.

Anthracite, often used as an important fuel for the production of chemical fertilizers, is chemically unstable and can even volatile and spontaneously combusted, and is used exclusively for power generation.

The coal in this mining area, which is coking coal or 1/3 coking coal, can be coking to produce coke.

Soon, another well transfer unit also drilled to the coal seam and stopped; The thickness of the covering soil is 5 meters or 7 meters, and it is not difficult to excavate, and an excavator is enough.

"The No. 1 survey well, within a radius of 100 meters, all the topsoil is excavated, the upper and lower ramps are left, and the net is isolated from the deep foundation pit, ready for trial mining."

Liu Yu ordered the coal field to be stripped of overburden, and in accordance with mine safety regulations, open-pit pits of more than two meters must be excavated in a stepped manner, at least every two meters, in order to prevent landslides from collapsing. In addition, the diameter of the pit mouth must be greater than ten times the depth of the pit, waterproof, anti-landslide, and anti-debris flow.

This safety code was compiled by Liu Yu personally with reference to the regulations of various countries in the world and after improvement; There are detailed regulations on the technical requirements of mining, mechanical operation, manual operation, and transportation in each mining area.

As for the problem of environmental pollution, no one is interested in it for the time being, just stay away from residential areas, how polluting can a few factories be? It is very limited, and now the ecological structure is perfect, and the environment is very self-healing.

The boss gave an order, all the team members began to get busy, the excavator roared again, the largest mine excavator of Sany Heavy Industry, a big shovel went down, excavated more than one meter, and dug out 3 or 4 cubic meters of muck.

Mine trucks are parked on the side, capable of loading ten shovels of muck and taking turns to dump them out of the hills. Although the efficiency is not bad, the amount of work is too large, so Liu Yu can only call for support, and let the stone send two more excavators and six trucks to transport the barricade, baffle, prefabricated house, cement and gravel, and drainage equipment by the way.

Shi was also curious about what the coal mine looked like, and personally led the convoy to the mining area; Following the two tracks, we soon reached the outskirts of the hill and saw a large patch of black earth, piled up between a valley.

It just so happened that a team member drove a truck and came out to dump the muck, and Shi hurriedly stepped forward and asked, "Lao Li, is this pile of coal?" I don't look like it..."

"Captain, this is coal... The soil on it is more than five meters thick, and I haven't seen the coal yet~ It is estimated that it will not be dug up today, so let's go and see it first! ”

"Damn, hurry up, sloppy!"

The boss didn't say it clearly, and the stone didn't know whether the coal was dug up or not, and he thought that this pile of black soil was Shenma coal, and he was beaten by Lao Li.

The convoy entered the mining area, and the excavator was roaring with a left shovel and a right shovel; The middle is dozens of meters in circumference, and the whole has been dug down more than a meter high, and the soil has begun to become dry and hard, and it is not so easy to be excavated.

According to Liu Yu's instructions, the soldiers of the corps brushed the circle with red paint at the edge of the intended mining area, with a diameter of about 200 meters, which is the first stage of the pit, and the planned depth is 1.5 meters. The diameter of the second order is 190 meters, the diameter of the third order is 180 meters, and the diameter of the fourth order is 170 meters.

On the second stage, a drainage ditch was built to collect and drain the seepage water from the periphery out of the pit; At the edge of the mine, safety fences and baffles are being built, and many soldiers are cutting down timber and erecting wooden piles around the mine.

The stone reported to the boss and assigned tasks, Liu Yu introduced the specific situation to them, arranged two excavators to enter the post, and the excavation speed was greatly improved.

The rest of the team began to set up camps and build supporting facilities, and the supply of water and electricity must be ensured, as well as the food, clothing, shelter and transportation of the coal miners. At least, dozens of prefabricated houses, drinking water wells, generator rooms...

……

Liu Yu handed over the coal mine work to Shishi, and led the survey team to the next target - hematite; There are two iron mines near the West Tilt Mountain, and the ore is said to be of good grade!

One of them is just a few kilometers away and has a very unique location, a small ridge on the plain, which stands out like a flock of chickens and is easy to find.

Two mining trucks, carrying high-power percussion drills, bumped all the way, and quickly found this hill, which is only a few tens of meters high, with rich vegetation and relatively thin soil.

A boulder was randomly selected, and Liu Yu ordered drilling and sampling for testing, and the results showed that the sample belonged to the Precambrian red sandstone, which was likely to contain iron ore, and it looked like this place was really this place, which should be right!

According to the data, the total reserves of this hematite are about 100 million tons, and the iron content is about 67%, which can fully meet the short-term needs of smelters and cement plants.

After marking the location, the survey team continued to the last target, a mixture of gypsum, lime and clay, which is located near the West Slope Mountain.

Lime, widely stored all over the world, the main chemical component is calcium carbonate, which is easy to be dissolved, so in limestone areas, stone forests and karst caves are formed, called karst terrain.

Limestone mining areas, mostly associated with clay, China is a country rich in clay resources, excellent mineral quality, complete genesis types, and large reserves near the Xilian Mountain.

In addition, there are rock salt mines under the West Slope Mountain, accompanied by a large amount of gypsum, all of which come from lacustrine sediments and have high economic value. Rock salt is sodium salt, NaCl, which can be used to produce edible salt, or chemical raw materials.

Liu Yu plans to develop all four important minerals at the same time; In ancient times, edible salt was very expensive, at least ten times the price of rice, and the taste was astringent, even mixed with many sand grains.

Rock salt ore reserves are huge, usually a few meters to hundreds of meters thick, and it is simple to mine, dig a shaft down, pour hot water to dissolve, and then pump it out and boil.

Turkic, Tubo, Datang, Tuyuhun, are all potential customers, sales and profits can not be underestimated, it is necessary to build a large-scale modern salt factory!

……

In the next few days, the focus of the work of the escort team and the Xilian Corps was shifted to mine development, and the Gahai Coal Mine was named: Xitianshan Open-pit Coal Mine, with a diameter of 200 meters and a coal mining area of 25,000 square meters.

The gypsum mines, salt mines, limestone mines, and clay mines at the northern foot of the Xiluo Mountain have all been successfully explored, and the specific mining locations have been basically determined, and preliminary work is underway.

The hematite mine is also being excavated, but this time it is not so smooth, there is a small problem with the location, and there is no ore for three consecutive days of excavation.

Liu Yu was not in a hurry, and sent several excavators to support the No. 1 hematite mine; Shishi, Sun Xiumei's mother and daughter all went back and forth to inspect the mines, but Sao Nian ran away by himself.

… To be continued...