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pillar and stall mining of gypsum

pillar and stall mining of gypsum

descending stratigraphy of ore-bearing rocks: overburden; 5-8 m of thenardite-glauberite,gypsum, magnesite, and clay; 8 m halite and anhydrite, 5 m reddish lutite with layers of halite, glauberite, and nodular anhydrite. location info. ...stallandpillar mining. materials.

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