Thornton lived in a cabin located near Boundary Creek. Jack Thornton was also known as 'Jolly Jack' and had been in the US Navy at one time. It is a local legend in the Boundary Country.Ī prospector named Jack Thornton had been prospecting many creeks around the city of Greenwood, British Columbia. Many have searched for the lost placer mine of Jolly Jack. The mine has been written about by local historians and various magazines. Jolly Jack's Lost Mine is a legend about a hidden placer mine supposed to be located in the Boundary Country of British Columbia.