There are Provincial government reports as early as 1906 commenting on the feasibility of mining coal in the Lower River Inhabitants Basin and specifically in Whiteside. This is a link to "Coal Prospects in Whiteside District, Richmond County," Department of Mines Memorandum #430507, dated 1958, which consists in 12 facsimile pages including the 1906 report.
A 1993 book on coal in Nova Scotia says the following about the mine which was ultimately established in Whiteside :
"In the Richmond Basin [sic] of Cape Breton, the Tidewater Fuel and Navigation Company operated a mine in Whiteside in 1928, one of three short-lived ventures there"
J.H. Calder et al. One of the Greatest Treasures: The Geology and History of Coal in Great Breton (Nova Scotia Department of Natural
Resources) 1993, p.27
"In the Richmond Basin [sic] of Cape Breton, the Tidewater Fuel and Navigation Company operated a mine in Whiteside in 1928, one of three short-lived ventures there"
J.H. Calder et al. One of the Greatest Treasures: The Geology and History of Coal in Great Breton (Nova Scotia Department of Natural
Resources) 1993, p.27