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一、原开采方法评介应城石膏矿床赋存于第三纪沉积地层中,白色纤维石膏(简称纤膏CaSO_4·2H_2O品位高于95％)因次生水化作用而富集成层,并以薄层群赋有,单层厚度数厘米至十几厘米,个别厚达20厘米。原生矿物为硬石膏(CaSO_4)和部分泥质石膏(简称泥膏CaSO_4·2H_2O品位高于65％),因泥膏亦有次生形成的,它与硬石膏之间,随着埋深变化呈互为消涨关系,
I. Evaluation of the original mining method The Yingcheng gypsum deposit occurs in the Tertiary sedimentary strata. The white fiber gypsum (hereinafter referred to as CaSO 4 · 2H 2 O grade higher than 95%) is enriched in layers due to secondary hydration, Endowed with a single layer thickness of several centimeters to ten centimeters, individual thickness of 20 cm. The primary minerals are anhydrite (CaSO 4) and some argillaceous gypsum (abbreviated as CaSO 4 · 2H 2 O, the grade is higher than 65%). Because the ointment is also formed secondary, it changes with the depth of the gypsum Mutual relationship between each other,