On August 7, 1999, about 2300 Alaska daylight time, a wheel equipped Cessna A188-B airplane, N731UW, sustained substantial damage during landing at a remote mining airstrip, about 50 miles north of Bettles, Alaska. The airplane was being operated as a visual flight rules (VFR) cross-country personal flight under Title 14 CFR Part 91 when the accident occurred. The airplane was registered to Allwest Freight Corp., Flat, Alaska, and operated by the pilot. The commercial certificated pilot, the sole occupant, was not injured. Visual meteorological conditions prevailed. The flight originated at the Nenana Municipal Airport, Nenana, Alaska, about 2130. During a telephone conversation with the National Transportation Safety Board (NTSB) investigator-in-charge (IIC), on August 9, 1999, the pilot reported he was landing toward the south at the mine airstrip. The airstrip is oriented north/south, and is about 1,000 feet long, and 50 feet wide, at an elevation of 1,120 feet msl. The pilot said rain was falling, and he was flying to the airstrip to repair an area of soft ground on the strip. During the landing roll, the left main tire entered the area of soft ground. The airplane ground looped to the left, and received damage to the right wing, the right horizontal stabilizer, and the right elevator. The pilot did not submit a Pilot/Operator report (NTSB form 6120.1/2).