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我局荷沂矿区主要地层有花岗岩以及上石炭统船山灰岩和下二叠统栖霞灰岩。由于后期构造运动的影响，使矿区裂隙溶洞发育，几乎孔孔漏水。花岗岩的特点是：石英（40％以上）、长石的含量高，石英常呈聚粒状集合体、聚斑状、斑晶出现，斑晶约占30—50％，斑晶直径达4—10毫米，多为隐晶质。基质多为长英质，粒径0.1毫米（相当于140目）左右。后期的石英粒径在0.08～0.3毫米（相当于60～180目）左右。岩石在后期的硅化作用比较强烈，
I Bureau Bureau of the main strata in Hexi Mining granite and the Upper Carboniferous boat limestone and the Lower Permian Qixia limestone. Due to the influence of the tectonic movement in the late period, the fissures and karst cavities in the mining area develop and almost leak holes. Granite is characterized by: Quartz (40%), high content of feldspar, quartz often polygranular aggregates, polygamy, phenocrysts appear, about 30-50% of the phenocrysts, phenocrysts diameter of 4-10 mm , Mostly cryptocrystalline. Substrates mostly long British quality, particle size 0.1 mm (equivalent to 140 mesh) or so. Late quartz particle size 0.08 ~ 0.3 mm (equivalent to 60 to 180 mesh) or so. Silicification of rocks in the later period is more intense,