Sentence:  The four last-mentioned mines, <WSD>Wheal</WSD> Crowndale, <WSD>Wheal</WSD> Crebor, East Liscombe, and <WSD>Wheal</WSD> Tamar, are on the same lode, which ranges as usual from east to west, and are included in a space of about four miles in length. 
Meaning of the word marked with <WSD> tags:  A mine.