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In 2017, AAI completed approximately 400 feet of vertical-up NQ3-diameter core holes at three Lehigh Hanson underground limestone mines located in Pennsylvania.  Holes were drilled into the roof atop a 30-foot scissor lift using AAI’s lightweight LA-100 aluminum-frame drill rig.  An AAI Staff Geologist logged core on-site during coring and the core was returned to AAI’s lab in Grand Junction for testing afterwards.


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