In 1864 the Vancouver Island Exploring Expedition explored areas of the Colony of Vancouver Island that were then unknown outside the capital of Victoria and settlements in Nanaimo and the Cowichan Valley. The expedition went as far north as the Comox Valley over four and one half months during the summer and fall of 1864. The result was the discovery of gold in one location leading to a minor gold rush, the discovery of coal in the Comox Valley, an historical record of contact with the existing native population, the naming of many geographic features and a series of sketches recording images of the time.
The need for exploration of unsettled areas of Vancouver Island had been the subject of comment in the colonial press in the early 1860s but it was not until the new Governor, Arthur Edward Kennedy arrived in March 1864 that the project had a sponsor. In April 1864 he announced that the government would contribute two dollars for every dollar contributed by the public.
From his arrival in Victoria in May 1863, Robert Brown had been working in the colony as a seed collector for the British Columbia Botanical Society of Edinburgh on a meagre income. He had explored the Alberni Inlet including Sproat Lake (which he named) and Great Central Lake. He named some of the surrounding geographic features for his sponsors. Between May 28 and July 8 he explored from Barkley Sound to Kyuquot and Nootka Island. After returning to Victoria, he crossed the Strait of Juan de Fuca to Port Townsend, Port Angeles and Whidbey Island and went as far as Seattle. In September 1863 he travelled to Lilloett and New Westminster followed by a return trip to Port Alberni where he established the length of Great Central Lake. Although his seed collection disappointed his sponsors, the experience and the reputation he earned in Victoria was recognized on June 1, 1864 when he was appointed as commander of the Vancouver Island Exploring Expedition. Brown considered his mission to report on the topography, soil, timber and resources however his sponsors were more interested in whether gold would be found.