Joint Ventures The Company's participation in the mining sector of the diamond industry is through its ownership interest in the Ekati Diamond Mine and the Diavik group of mineral claims. The Company holds a controlling interest in the Ekati Diamond Mine property through its interests in the Core Zone Joint Venture and the Buffer Zone Joint Venture, with the remaining interests held by other minority joint venture parties. DDDLP holds an undivided 40% interest in the assets, liabilities and expenses of the Diavik Diamond Mine and the Diavik group of mineral claims. The Diavik Diamond Mine and the exploration and development of the Diavik group of mineral claims is a joint arrangement between DDMI (60%) and DDDLP (40%).