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seaint Digest for 4 Dec 1998 -Reply[Subject Prev][Subject Next][Thread Prev][Thread Next]
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- From: Jeff Franklin <JFRANKLI(--nospam--at)cwvgw.osmre.gov>
- Date: Mon, 07 Dec 1998 09:57:47 -0500
Re:pit ramps Horace K Church 's "Excavation Handbook" c.1981,McGraw -Hill indicates in section 15-3 for open pit mines "a maximum grade of -/+ 8 percent as being conducive to economical all -weather operation".
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