GUNNAR GOLD (GGG.TO) IN VENTURE AGREEMENT Gunnar Gold Inc said it and Mill City Gold Inc signed an option and joint venture agreement with Tyranex Gold Inc on the Tyranite gold property in Ontario. Gunnar said it and Mill City can earn a 50 pct interest in Tyranex's option to buy the Tyranite gold mine by spending up to five mln dlrs on exploration, development, and feasibility studies by 1990. It said the companies may form a joint venture partnership to bring the mine to full commercial production.