Thin Lode Mining Method

Store conditions of extra narrow veins are complex. According to the store state of extra narrow veins such as the inclination of extra narrow veins and the firmness of mine rock, the paper divide it into gently inclined extra narrow veins , inclined extra narrow veins, steep extra narrow veins. On this foundation, the paper analyses and researches the main schemes, the construction element of slope, the arrangement of mining- cutting project ,the stopping techniques and ground pressure management of each kind of mining method which used to mining the extra narrow veins at present in China, In addition, application and applicability of each mining method are appraised . Author thinks that mines of mining the extra narrow veins home use mostly over-all method,shrinkage stopping method, resuing-fill method and their type-change schemes, other mining methods are comparatively less, still has fairly big gap comparing with developed countries in mining trade, generally existent problems are: low mechanization operation , greater worker labour force , low stope capacity, greater dilution rate and loss rate as well as the unsafe etc.. In view of above problems, author have put forward corresponding mining method schemes according to the mining reality of our country by optimizing stope structures and improving mining techniques.Studies considered: the mining method of reasonable option is the one of important programs of mining production. In the process of mining method option, For the extra narrow veins, being used mining methods of option ,good and bad on technical economy is not obvious, a fuzzy mathematical method was used to quantify the indexes affecting the mining methods and a matrix was established for fuzzy evaluation. Some mining methods were preliminarily selected, then making fuzzy comprehensive evaluation and choosing optimum mining method finally. Choosing mining method applying fuzzy mathematics is scientific and accurate than traditional comparison of technical economy. It has realistic meaning for the mines of gold and non-ferrous metals which mine extra narrow veins.