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(II) Types of Common Bidding Projects in Mining Engineering 1. Project Bidding Contracting This is a bidding for the selection of projects. The national or industry authorities, or the board of directors of the fund-raising unit, is responsible for organizing such tenders. When the project investment is implemented, the bidding department publicly proposes the technical and economic objectives of the mining project to be tendered.
2. Project construction tendering general contracting The project general contracting is completed from feasibility study, survey and design, organization and construction, equipment ordering, staff training and completion acceptance. All work is completed by one contractor. This contracting approach requires less risk project, the contractor has a wealth of experience and solid strength, at present it is mainly used in coal washing plant, Factory like single project or concentrated residential buildings, and now there are few of The entire mine was piloted by the general contractor.
3. Stage tendering and contracting This is to tender bidding for certain stages of the mining project at a certain stage or stage to several units. For example, the mine construction is divided into feasibility study, survey and design, construction, training and other stages to carry out bidding and contracting. This is the contracting method adopted by most projects at present.
4. Special tendering contracting refers to a special project at a certain construction stage. Due to its strong professional skills, it needs to be constructed by specialized enterprises, such as shaft drilling and shaft drilling, various special method sinking wells, etc. contract. There are also special contracting practices for hoists, ventilators, and fully mechanized mining equipment. 
Common bidding project content and types of mining engineering
(I) Contents of Common Bidding Projects in Mining Engineering At present, mining engineering projects adopt the content of bidding, which covers everything from planning and implementation to training and completion. According to the scope of the bidding, there are many different forms of bidding; due to the complexity of the mining project, some forms of bidding are still underway.