(1) Full mining: Including the layer containing ore to the upper limit surface to the object can be regarded as containing gold mining site for the lower limit of all loose deposits, known as mixed sand. At present, comprehensive mining is mainly carried out by gold mining and water gun mining. 1. Mining of gold mining vessels: Gold mining vessels are mining and selecting combined mechanical equipment floating on the water. It is one of the most advanced methods for mining gold gold. It is suitable for mining floodplains and shores with low grade and large reserves. Shore sand gold mine. The mining technical conditions for gold mining vessels are shown in Appendix 1. 2. Water gun mining: The high-pressure water jet sprayed by the water gun is used to flush the mining sand, and then transported to the beneficiation system with a sand pump. The minimum width of the mining face is 20 meters. The minimum ore content is between 5 and 1.5 million cubic meters, and the water consumption per cubic meter of ore is generally 15 to 22 cubic meters. The water gun mining is suitable for the slope of the ore body floor, the debris material is easy to be washed, and the section height of the stope is not more than 20 meters, or the gold deposit in the terrace. (2) Mining separately : The mining sand layer is opened after the mud layer is peeled off. It is suitable for mining deposits with clear boundaries of sand and ore layers and suitable for stripping mining. Second, underground mining: It is suitable for mining deposits with high grade and deep burial deposits that are not suitable for open pit mining. The height of the mining frame is 1.3 to 1.5 meters from the surface of the bedrock. If the thickness of the ore layer is less than the height of the mining frame, it can be measured by the value of the meter. Hardeners, also called hardeners, are substances or mixtures that enhance or control curing reactions. Curing agent is an essential additive. Whether used as adhesive,
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chemical reactions. Curing is accomplished by adding curing
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properties, heat resistance, water resistance, corrosion resistance and
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　　 First, open-pit mining: