Open-pit Mining General Contracting Mode And Application Security Problems

Since 1980 s, with the development trend of economic globalization and integration, the general contracting of mining exploitation has been adopted by more and more mining enterprises as a kind of management and strategic mode. In this paper the application of literature access method and on-the-spot investigation law as, in an open pit mine as the research object, for open pit mines mining operation mode, open pit mine exploitation in the general contracting contract, general contractor in open-pit mining examples analysis, general contracting open pit mining safety evaluation five aspects of the in-depth study, the research contents are as follows:First, the existing open-air mining operation mode of view, the stage of the mining operation mode of the system, a comprehensive summary of the scope of application of various types of models are advantages and disadvantages to do a more in-depth discussion, given the business model with the contractor selected reference basis.Secondly, the development of several important issues and contract management, respectively, contract drafting, contract management philosophy, ore contract unit price determination, contract security rights and responsibilities of both parties to discuss the issue. When determining ore price, it lists a variety of factors that affect the unit price of ore, ore proposed unit price is calculated, and practical application to verify the correctness of calculations and practical. Both parties start from the mine, summed up the security responsibilities on the right of both parties to solve the contract responsibilities and rights of the most vulnerable of the problem is unclear.Then, through an open-air limestone mine in Sichuan for field research, analysis of the self-mining operations and general contracting state, mining contracting mode effect analysis, concluded:(1) Reduction of the initial investment in mine construction;(2) Personnel, downsizing, labor efficiency;(3) Extraction speed;(4) Reduce the total amount of training;(5) The cost of security and safety accident rate. Starting from the two angles of both Party A and Party B, Party A shall carry on the discussion from the aspects of supervision and logistic, Party B from the safety management, blasting, ore shipment, slope management, auxiliary system five aspects carries on the discussion, summarizes the parties related to safety issues.Finally, according to the security problems of the open-air mining contractor may exist, do their security status was evaluated and analyzed. Using fuzzy analytic hierarchy process, through the establishment of hierarchy analysis diagram, determine the weight, multi-level fuzzy evaluation, determine the system security level five steps proposed EPC open pit mine safety Fuzzy hierarchy evaluation model, and an open pit mine for the object instance application, the mine evaluation result is "safer." In accordance with the evaluation results, combined with the factors that affect the safety of the open-air mining, security review and supervision from the Party, Party job site, put forward specific measures to improve the safety of the mine.