Megalong Coal and Shale Mining Company Limited to acquire the mining rights, from Messrs. W. C. Wall MP, I. Wall, D. R. Wall, Thomas Hassall, William Dowel, and J. M. Moxon, and to mine for coal and shale. This period was at the start of the 1890s depression and company was "extinct' a year later. At the time of his mother's death, in 1891, he was living in Wentworth Falls, NSW. In the same year he appears to have had some financial benefit from his enterprises and moved his family to live in Sydney. Between 1892 and 1895 (the year he was defeated in the Rylstone Election) he took out further mining leases at Hargraves (with George Ensor), at Windeyer (with Robert Victor Leffley) and alone at Peak Hill (130 Km west of Mudgee). In 1903 he took over the gold mine of Garner and party at Windeyer. In 1907 W.C. Wall and Patrick Pilley held Mining Lease No. 1 at Hargraves, NSW. 1908 saw him negotiating with Messrs G and C Hoskings, proprietors of the Eskbank Iron Works, about the sale of his discoveries of iron ore at Cooyal, Lowes Park and Tallawang. In 1909 he went so far as to set up an "open draught furnace" and produced some iron which he exhibited at the Mudgee Show. Wall was an activist for sound forestry management and was well known for his knowledge of geology and as a champion for mining and miners when he served in parliament. Gold production peaked in Australia in 1903 at around 130 tons (about 30% of total world production), so, Wall's activity coincided with the period of greatest Australian interest in gold mining. After his parliamentary service, his Megalong Valley enterprise and his discharge from bankruptcy on 19 Nov 1901, Wall's activity switched back to the Mudgee area. Between August 1907 and May 1908, he took up further mining leases in Windeyer and Hargraves. The complex geology of the district held/holds many opportunities and gold mining the deeper reefs using modern techniques is still being carried out (Aug. 2008) in all the Mudgee areas where Wall once held mining leases. In 1906, he attempted to set up a kerosene shale mining operation in the Barigan Valley (at Peters Creek, west of Barigan Road) – between Wollar & Botobolar, but this project seems to have been later abandoned. (However in 1924 and again in