Evaluation of karst occurrence at the construction gypsum deposits

Various methods of calculation of a productive strata cavernous porosity at the gypsum fields are considered. New complex method of calculation of a cavernous porosity based on determination of the cavernous porosity volumetric coefficients of a surface features and internal cavernous porosity is offered. Results of approbation of the offered method on the Sokolino-Sarkayevskoe field of gypsum and anhydrite are presented. It is established that percentage of a superficial and internal cavernous porosity of the filled cavities characterizes the productive strata dilution.