TUCSON, ARIZONA (May 18, 2026) — A $10 million transaction recorded April 27, 2026, involving mineral interests near Mt. Lemmon / San Manuel, tied to the renewed advancement of the Oracle Ridge copper project northeast of Tucson, that straddles the ridge between Pima and Pinal Counties.
The seller was Marble Mountain Ventures LLC, c/o Oracle Ridge Holdings, and the buyer was Silver Mountain Mining LLC and Wedgetail Operations LLC of Tucson. The transaction closed shortly after Eagle Mountain Mining announced a joint venture with Japan-based Nittetsu Mining Co. for the Oracle Ridge copper project.
Oracle Ridge is a historic underground copper mine located northeast of Tucson, near San Manuel. Eagle Mountain describes the project as less than a two-hour drive from Tucson and about 50 minutes from San Manuel. The company says the mine was previously operational in the 1990s and produced a high-grade copper-silver-gold concentrate. Existing infrastructure on the site includes approximately 18 kilometers of underground development and mine buildings, although the historical processing plant has been removed…