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Underground Iron Ore Mining

Some ore deposits found in jasper-slates and in the horizon between these and their associated clay-slates in the latter they are true contact-deposits. They are found in this jasper- and clay-slate formation under varied conditions, yet, in all, certain characteristic laws are preserved. The angle of dip varies from 15 to 20 , and up to 85 and even 90 , with the horizon. The ore is.

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