Stephen J. Kravits

In-mine Test of the Bureau of Mines Preproduction Wireless Survey System

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Demonstration of Accurate Directional Drilling at Navajo Dam

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Determining the Source of Longwall Gob Gas

Lower Kittanning Coalbed, Cambria County, PA

Four coreholes were drilled (two before and two after mining) at a longwall mine to obtain coal and rock samples from overlying strata to determine th...

Accurate Directional Borehole Drilling

A Case Study at the Navajo Dam, New Mexico

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