A former tin mine engine house at St Day has a freehold guide of £6,000 plus.
Also in St Day, a freehold parcel of land next to United Downs Industrial Park has a guide of £500 plus.
Cornwall Council has instructed the sale of the rectangular shaped site. The parcel measures 0.18 hectares (0.44 acres).
Bidding for the current auction, the sixth of the year, goes live on Wednesday, October 30 and ends on Friday, November 1.
Visit www.cliveemson.co.uk for more details.