Rotary drilling reached a measured depth of 10259 feet last night, and was within 30 feet of completion when the tricone bit gave out. This necessitated tripping out of the drill string, replacement of the bit, and tripping back in. The crew is currently reaming out the open hole as they progress downwards. By tomorrow morning, the last 30 feet of the hole should be drilled, and then operations will commence for the coring phase of sidetrack two.