Most of the project area is covered by a few metres of glacial till and outcrop is very scarce. Regional mapping is largely based on geophysical interpretation. GTK’s regional 1:200,000 mapping program indicates that much of the property is underlain by Archean-aged clastic sedimentary rocks which is intruded by younger Paleoproterozoic-aged gabbro sills and granitic rocks.

In Orogenic-type deposits, structure controls gold emplacement. Portions of the Jeesiö property straddle the Sirkka Shear Zone or related regional-scale structures such as the Venejoki structure. 

The Venjoki structure is over 100 km long and lies 5-to-25 km south and is subparallel to the Sirrka  structure. The Venjoki structure represents a thrust zone where Paleoproterozoic and Archean-aged rocks were pushed northward over the Central Lapland Greenstone Belt.  North to NE strike-slip shear zones related to this regional thrust are associated with several gold occurrences in the region. 

Typically in Orogenic-style deposits in greenstone environments host gold bearing veins that are enveloped by alteration haloes consisting of iron-carbonate + sericite + sulphide to various amounts of chlorite, calcite and locally magnetite. Pervasive chromium-or vanadium rich green micas (fuchsite and roscoelite) as well as ankerite with zones of quartz carbonate stockwork are also common in sheared ultramafic rocks.

Drilling into the Utsamo target has intersected a lithologic package consisting of arkosic quartzites with some sericite alteration, interlayered with lesser intermediate tuffites and mafic volcanics, which were intruded by narrow mafic and ultramafic dykes or sills. Some holes encountered a 25-metre-thick fault gouge that was formed by extensive shearing, alteration and oxidation of both the arkosic quartzites and mafic-ultramafic rocks. The fault gouge is comprised of pervasive clay alteration enriched in iron oxides and contained abundant fragments of quartz-carbonate-sericite veins similar to those associated with gold elsewhere in the region.  Magnetite, disseminated pyrite and abundant carbonate has been intersected in some holes.

At Saittavaara target in the Kataja belt, reconnaissance drilling encountered intensively sheared and sericitized quartzite from just below shallow overburden, including several quartz veins with strongly sheared and silicified wall rock. Disseminated pyrite is prevalent but variable, and the alteration may be termed quartz-sericite-pyrite (QSP), which is commonly seen in orogenic gold deposits.

Trenching at KJ South exposed intensely sheared contact between siliciclastic metasedimentary and mafic intrusive rocks, revealing several mineralized quartz-sulphide veins and lenses within both units. In addition to pyrite and magnetite, geologists also noted the presence of chalcopyrite and copper oxides. The gabbro in the area is likely attributable to mafic sills that are related to a younger continental rift setting (Haaskalehto-type), which are common at the Jeesiö Project. The mineralization encountered in the trenches is clearly controlled by shearing, as it crosscuts both lithologies and the contact between them.

KJ Hill is located approximately 900 metres to the north of KJ South along the trend of a N-S oriented magnetic feature. Along the eastern slope of the hill, there are fields of locally derived boulders displaying abundant mineralized quartz veins intruding metasedimentary (arkose and quartzite) and mafic rocks.

For additional details, please refer to the Technical Report and MDA .