RJK Explorations Ltd. is a Canadian mineral exploration company specializing in the acquisition, exploration, and development of early-stage mineral resource properties. Founded in 1922 and headquartered in Kirkland Lake, Ontario, the company primarily focuses on diamond exploration along with gold, silver, cobalt, and other base metals. Its principal activities revolve around identifying and developing prospective mining properties in Northern Ontario, with notable projects including the Bishop and Kon diamond claims in the Cobalt area. RJK Explorations aims to discover economically viable deposits, such as the source of the historic 800-carat Nipissing yellow diamond. Operating within the materials sector, the company plays a strategic role in advancing mineral resource development to support Canada's mining industry.