Coleman’s report on several seasons of field work appeared in 1905 as Sudbury Nickel Region, Ontario Bureau of Mines, Annual Report, vol. 14, part III. Coleman was the first geologist to recognize the true relations of the North and South nickel ranges. In a speech delivered in February 1905 to the Empire Club ( Toronto), Colelman stated,

" The Sudbury nickel region is unique in the world. I think we may safely say it has not its parallel anywhere else in the world. It is unique in its geological relationships. All the mines of nickel now being worked in Ontario are connected with one great sheet of eruptive rock. It looks as though that great sheet of molten rock had brought to the surface all our great and important nickel deposits. We have not found deposits elsewhere. We have a sheet there about forty miles long and fifteen or sixteen miles wide and here and there, all along the outside edge of it, we have nickel deposits. " ¹

The world market for nickel had increased: alloys of nickel and iron were found to make effective armour-plate and the U.S. Navy put in a large order for Sudbury nickel. Other countries, especially Germany, Great Britain and Italy, began to buy nickel from the Sudbury suppliers in order to keep up in the pre-World War I armaments race.

By 1905, Sudbury nickel production surpassed New Caledonia's and gradually, year after year, increased its lead until in 1915, Sudbury was supplying more than 80% of the greatly-increased nickel demand of the world.