The Oijärvi greenstone belt is located in northwest Finland, in the Meso- to Neoarchean Pudasjärvi complex. Discovered in the early 1990s by the Finland Geological Survey (GTK) using regional magnetic geophysics it is one of the least studied greenstone belts in the region. Initial exploration by the GTK involving mapping, till geochemistry surveys and diamond drilling led to the discovery of the Kylmäkangas Au-Ag deposit. The Oijärvi Project was eventually acquired by Agnico Eagle in 2006 and purchased by Gold Line Resources in 2021. An updated NI 43-101 compliant Mineral Resources Estimation on the Kylmäkangas deposit was completed by Gold Line Resources in 2022 with an Indicated and Inferred resource of 2.70 million tonnes grading at 3.6 g/t AuEq for 311,000 AuEq equivalent ounces.
Gold Line Resources acquired 5 Exploration permits from Agnico Eagle in 2021 over the Kylmäkangas deposit in the central portion of the belt. Following this, Gold Line Resources applied for and received an Exploration Reserve permit over the rest of the 17,600 Ha Oijärvi greenstone belt, bringing the entire belt into the Gold Line Resources portfolio.