The general term for the mining, cutting and mining operations carried out by ore from the ore. Accurately dig a series of roadways to create conditions for cutting and mining work; cutting work forms free surface and falling space for mining work; mining work recovers ore from mining face, including mining, mining and ground pressure management Kind of work. There are many classifications of mining methods. The Natural Support Mining Act is also known as the Open Field Mining Act. The goaf formed during the recovery process is maintained by the stability of the pillar and the surrounding rock itself; some are supported or temporarily supported by the support or mining ore. This law applies to ore bodies where the ore and surrounding rock are stable. Manual Support Mining Method This method uses a filling material or other support to maintain the goaf. Applicable to ore bodies where the surrounding rock is unstable, the ore is valuable, and the surface needs protection. Among them, the filling materials are used most frequently (see manual support mining method, filling mining method). The caving mining method advances with the mining face and plans to collapse the surrounding rock filling goaf. This type of mining method should be allowed to collapse. The mining method should consider the geological conditions of the deposit, the technical conditions of the mine and the economic factors to meet the requirements of safety, economy, efficiency and quality. The geological conditions of the deposit include the shape, inclination, thickness, distribution of useful components, physical, mechanical and chemical properties of the surrounding rock and ore. The technical conditions of the mine include the supply of materials, equipment and labor, the requirements of the processing department for ore, and the surface. Environmental requirements and technical management levels; economic factors include ore value, cost, profitability, comprehensive utilization of resources and national economic requirements. According to the above conditions, several schemes are selected, and the optimal scheme is determined through comprehensive comparison of technology and economy, and is officially used after industrial trials. In the early 1950s, China almost exclusively used the simple-chamber mining method, the mining and mining method and the dry filling mining method. In the mid-to-late 1950s, the open-field mining method of deep hole and deep hole rock drilling in deep hole and downhole drilling was started. In the 1960s, stage and sublevel caving mining methods were used, cementation and hydraulic filling mining methods, and pole column mining methods. In the 1970s, various mining methods for the application of diesel trackless self-propelled equipment began. Nu Er Hong,Nv Er Hong Wine,Nv Er Hong Rice Wine,Nv Er Hong Yellow Rice Wine ZHEJIANGGUYUELONGSHAN SHAOXING WINE CO.,LTD. , https://www.chinashaoxingwine.com
Nv Er Hong, literally means Daughter Red, a metaphor of a girl reached her full maturity through 18 years of upbringing. In ancient times, parents bought jarred wine and stored when daughter were born, and when their daughter were married at the age of 18, they would open the jar to drink the wine. It reveals Chinese cultural characteristics and echoes with Zhuang Yuan Hong. With red as the main color for packing, a celebrative color, deeply loved by the newlyweds. A mild wine, suitable for wedding.