关键词: 建筑用矿石, 变质长石石英砂岩, 夹石成因, 夹石综合利用

Abstract: The Tongziwa mining area in Heyuan，Guangdong Province is a large-scale metamorphic feldspar quartz sandstone mine for construction. There are many layered-like horse-stones in the ore body， which are mostly interbedded with metamorphic feldspar quartz sandstone，and the water saturated com⁃ pressive strength is low. Through various analysis，it is clear that the genesis of horse-stone is closely relat⁃ ed to lithology，rock fracture development and metamorphism. In order to improve the utilization rate of re⁃ sources and promote the innovation of mining technology，a systematic physical and chemical analysis test is carried out on the horse-stone in the mining area. The results show that the horse-stone is aluminum su⁃ persaturated neutral rock，the alkali aggregate reaction test value is 0.24% ( >0.10% )，K2O + Na2O con⁃ tent is 5.83% ( >5% )，which does not meet the quality requirements of building stone and brick clay. How⁃ ever，the average saturated compressive strength is 72.72 MPa，the firmness is 1%，and the crushing in⁃ dex is 10%，which all meet the quality and technical requirements of ordinary road subgrade and construc⁃ tion site backfilling. The research results provide technical support for the resource utilization of horse�stone inclusions in mining areas and help to improve the comprehensive utilization level of resources.

Key words: construction ore, metamorphic feldspar quartz sandstone, genesis of horse-stone, com? prehensive utilization of horse-stone