Nanaimo began as a trading post in the early 1800s; in 1849 the Snuneymuxw chief Ki-et-sa-kun ("Coal Tyee") informed the Hudson's Bay Company of the presence of coal in the area, and in 1853 the company built a fort known as the Nanaimo Bastion (still preserved). Subsequently the town was chiefly known for the export of coal. The 1887 Nanaimo Mine Explosion killed 148 miners and was the largest man-made explosion until the Halifax Explosion. In the 1940s, lumber supplanted coal as the main business, although Minetown Days are still celebrated in the neighbouring community of Lantzville.