Views on drilling effectiveness and sampling estimation for solid ore minerals

As a result of well drilling, a geological sample recovery was taken as a cylindrical rock sample. This rock sample core would be used for further study of the conditions of occurrence of ore minerals. The great practical importance of supplying reliability and representativeness of geological surveys is the assessment of drilling quality and effectiveness. We were attempting to study the core recovery measuring ways for efficiency estimating of drilling for solid minerals, which will be submitted in this article. Also analyzed existing methods, their advantages and disadvantages. The RQD (Rock Quality Designation) measuring method we suggest as criteria is the best way of unbiased effectiveness assessment. It is necessary to closely research the lithological section finished by drilling wells, and the geological, technical and hydrogeological conditions of the explored fields to solve economic efficiency at the down-the-hole cleaning method. In-depth study methodology of the main elements of the “diamond bit-rock” pair and the conditions of the normal drilling process can be the basis for successful implementation of geological tasks by drilling personnel. Currently uses three main methods of core recovery measuring (linear, volume, weight). However, they did not consider coefficients of fragmentation, fracturing and loosening and that is why the RQD method has a clear advantage over the traditionally used methods. The RQD method has already been successfully introduced to the geological exploration sites of the Ministry of Mining Industry and Geology of the Republic of Uzbekistan.