More than half an hour later, the drone that took off from the gas station arrived at the gold mine, and Zhang Tao remotely controlled the drone to put the bag containing nitroglycerin on a large tree a few meters away next to it, and the bag with a small iron screen was placed on the branch platform. Pen % fun % Pavilion www.biquge.info

Then the remote control pangolin driller drilled a few meters to the left at the underground entrance position, and then drilled more than ten meters underground, the pangolin driller drilled the resonance frequency of the soil while drilling the ground, and did not open the large circuit is the smallest gear, which was used by Zhang Tao as an underground radar.

Zhang Tao looked at the ultrasonic scan image of the drill on the mobile phone screen, the place where the soil is soft and scattered is the place where gold mining is needed, the place where there is no soil is the hole drilled by the drill, and the place with high soil density is the place where it has not been drilled.

After a few minutes, Zhang Tao saw that the drill had drilled down enough depth, so he let the drill drill a hole 90 degrees to the right. After the driller retreated a few meters, Zhang Tao operated the mobile phone to pop out the spring coil of the drill, started the oscillation circuit, and the amplification circuit was also turned on to the maximum gear, evaporating the water around the hole and evaporating the water in the hole.

After Zhang Tao returned to the surface with a pangolin-type drill, he stopped in the ditch at the entrance of the cave. Waited a few minutes for the hole to fill with air. After a while, a harvester untied the bag containing nitroglycerin from the tree and flew to the hole with the bag.

The size of the pangolin drill is larger than that of the drone, and the drone is flying in the hole without any problems, and there are several small LED lights on the camera to illuminate the hole slightly, and the remote control drone is in the hole and turns around to the bottom of the hole.

After arriving at the hole, let the drone carefully grab nitroglycerin from the bag, put two explosive packets at the end of the hole one meter back, and then grab the lead of the explosive bag and pull it to the position where the hole leads vertically to the ground, and then let the drone return to the ground and fly to the big tree just now.

Then remotely control the pangolin drill back to the hole where the lead is placed in the ground, pop out the spring coil, open the oscillation circuit and several amplification circuits, and send ultrasonic waves to the leads, and the wavelength of the ultrasonic wave in phase gathers the air molecules, and the friction between the molecules makes the air temperature rise sharply and ignite the leads.

After turning off several amplification circuits, and then turning on the vibration frequency of the soil, from the screen of the mobile phone, the soil layer at the location of the explosive package in the hole was originally detected to be very dense, and now it is a very scattered area, it seems that the explosive package exploded successfully.

After waiting for a few minutes, let the soil in the cave settle down and fill the hole with air. Zhang Tao then asked the pangolin driller to put it back on the ground, and the drone flew to the ground with the explosives bag to place the explosives bag.

Half an hour later, after the explosives in the bag were detonated underground, the drill was drilled back into the hole to open the resonance frequency of the soil, scanning the soil layer in the hole, Zhang Tao looked at the soil structure from the mobile phone screen, the place where the hole was blown up was several small circular spaces, and there was a layer of soil separation between the small spaces, and there was a gap in the middle of the separation layer that was formed by the pangolin-type driller just now.

Several circular spaces are topped by a layer of soil that has not been blown up by explosives, and above the layer is a conical layer of dispersed soil. Zhang Tao remotely controlled the drone to fill the pangolin drill at the entrance of the cave with diesel, and then let the drill go back underground to drill out some protruding rock and soil layers at the bottom of the pit.

After drilling, the drone flew into the hole with a bag containing a small iron sieve, untied the bag, took out the small iron sieve, and placed it on the ground. Then the remote-controlled drone used a robotic arm to grab the pangolin-type drill and fly to the innermost small space, drill holes above the small space, and drill half of the holes first, and drill them into a circle smaller than the small iron sieve, so that the iron sieve can be put in.

Drill a wider hole in the middle of Zu'an's hole, and then continue to drill up, Zhang Tao looked at the mobile phone screen when it was more than ten centimeters away from the undrilled soil layer above, and let the drone fly down with a pangolin-style drill, and continued to drill several other small spaces.

After drilling holes in several small spaces, the drill is remotely controlled to climb up the wall of the cave, allowing the drill to climb into the soil layer where gold needs to be mined. Then remotely control the drone, grab the screen and fly to the small hole above the small space.

The iron sieve with a larger mesh is pushed to the top of the hole with a mechanical arm, and the hole is pierced, and the soil layer above has a vent, and a large amount of soil falls down, and then the mesh is quickly put into the wider hole wall below.

After the screen, let the drone fly to the next small space and continue to put the sieve in the hole above, the larger plug can block some metal hard blocks, the small plug can be smaller metal hard blocks, and the small sieve is mainly gold.

After the sieves in several small spaces underground were released, Zhang Tao remotely controlled the drone and flew back to the tree branch platform on the ground. Then, the pangolin-style drill drills back and forth in the soft soil layer above to let the soil leak down.

At the same time, the pop is evaporated by ultrasonic waves on the soil, and the spring ring is in the mouth under the head of the pangolin, which will not be blocked by the soil. The moisture in the soil is gone, it is slippery than adding lubricating powder, and the soil falls faster.

After more than ten minutes, Zhang Tao remotely controlled the pangolin drill to scan the gold ore soil layer, and found that there was no soil, which should have leaked. When two-thirds of the soil layer was gone, Zhang Tao returned the pangolin drill to the surface to prevent it from falling with the soil.

Seeing that there was no soil, Zhang Tao remotely controlled the drill to drill into the hole and dredge the soil in the hole. Let the rear remote control of an unmanned harvester with a bag also flew into the hole, first carefully took down the small sieve in the upper hole in several small spaces underground, and put the metal particles inside into the bag.

Then take the bag to the big tree platform on the ground, and then tie the bag to the branch with a rope to make a double insurance. Have another unmanned harvester fly over the thicker sieve with another bag, pour the contents of the sieve into the big bag, and then return to the large tree platform on the ground.

Zhang Tao remotely controlled an unmanned harvester to put the branches and leaves on the branch platform into the hole in the ditch, and then pushed the soil into the hole to prevent people or animals from falling into it. Then fill the fuel tanks of the three drones and the pangolin drills with diesel, and then tie everything to the base frame of the drones with ropes and fly back to the gas station.

Ten minutes later, the three drones flew back to the gas station, and Zhang Tao stood in the yard and landed in the yard remotely. First, untie the two bags from the drone and take them to the house.

Then the diesel barrel and pangolin drill were also removed, the diesel barrel was placed on the ground, and three drones were placed next to a firefighting sand in the yard. Zhang Tao returned to the house and fetched a basin of water and walked out with a rag. When they got to the sand pile, they moistened the surface of the three drones and the pangolin drills with water and wiped them clean.