Tecton Corp., a Swiss company, said this week that it has expanded its land holdings for its Firefly Project uranium mine located in San Juan County by acquiring 207 claims.

Firefly is located about 25 miles southeast of Moab. The mine is situated within an area of rich uranium deposits ranging from the Lisbon Valley to Uravan, Colo., that were heavily mined from the 1950s through 1980s.

The uranium in the Firefly mine was discovered in 1952 as an extension of the Grey Daun Mine.

Tecton — based in Zurich, Switzerland — holds an option to acquire a 100 percent interest in approximately 4,000 acres as 207 unpatented federal mining claims in the area. The claims cover both the Firefly Project and the Grey Daun Mine holdings. Tecton plans an aggressive exploration program with the goal of discovering new uranium deposits.