On Saturday, August 17, a group of six cavers entered Big Ridge Cave in Pennsylvania. They rigged the first drop, a 125-foot pit, and Bob Prowel went first. He found the rope ended 20 feet above the floor. He was able to get off rope on a small, exposed ledge. Since he wasn't familiar with the cave, a second caver, Pat Minnick, descended to the ledge. It was decided the rope needed re-rigged to provide more length, and this was communicated to those at the top. Then a caver coming through the gate near the top of the pit dislodged a small rock which went down the pit, hitting Minnick on one shoulder. Minnick suffered a bruise and was in "a lot of pain" but continued with the trip.
NSS News, December 1992 (Part 2) V50N12, Page 348.
Barry Duncan "Grotto goes to the Big Ridge" The Loyalhanna Troglodyte, (5) 1, Fall, 1991, p 20.
No analysis has been done.