It doesn't exist any longer, the area is now a modern industrial estate with no remains of previous buildings. If I may quote from Steve Wilson's excellent website
www.ossett.net ...
Paleside Mill
The mill located on Dewsbury Road, Ossett was built originally by Joshua Swallow, probably in the 1860s or 1870s for the prime purpose of cloth finishing. By 1881 Paleside Mill had been converted for rag grinding and spare capacity with on-site dyeing facilities was being offered to let by Swallow.1 The mill was subsequently put up for sale in 1892, but was withdrawn from auction after not being sold.2 Another similar advertisement appeared in 1895 with the mill being offered for sale or to let.3 It is not known if the mill was sold in 1895, but by 1901 the buildings were occupied by Bickle Brothers, rag merchants and mungo manufacturers together with J & G Lawrence, mungo manufacturers.4
1. "Ossett Observer", 9th July 1881
2. "Ossett Observer", 19th March 1892
3. "Ossett Observer", 7th December 1895
4. "Kelly's Directory", 1901