60 foot deep ore bins are being excavated from 10 foot diameter to 21 foot diameter. Use of a hydraulic winch and workdeck are being used. Night shift crew 07/27/2018 blasted a slash round from 28 to 36 feet. Workdeck was hung below the sheave to protect the sheave and wire rope. Concussion from the blast rocked the workdeck causing a kink in the wire rope.