Unga gold project, Unga Island, Alaska, USA
Redstar Gold Corp.
LOCATION: The Unga Gold Project covers portions of adjacent Unga and Popof
Islands, approximately 900 km southwest of Anchorage, Alaska. Redstar controls a 240
square km land package that is host to numerous intrusion-centered, intermediatesulfidation, structurally controlled epithermal vein, vein breccia, stockwork and
disseminated gold occurrences.
STORY: Redstar is currently focused on the Shumigan breccia located at the eastern
end of the Shumigan Trend. The Shumigan Trend, one of two partially fault controlled
NE-SW oriented semi-linear alteration trends, transects the entirety of the southern half
of Unga Island. Each of these trends is approximately 7.5 km in length and host to
numerous precious and base metal vein systems.
GEOLOGY: Epithermal mineralization is widespread and is thought to have been at
least partially coeval with Eocene to Oligocene Popof island arc volcanics. Gold and
silver bearing epithermal occurrences have common vein form, textures and gangue
mineralogy that spell out a district-scale, intermediate-sulfidation hydrothermal system.
Vein gangue is dominated by quartz-adularia-carbonate (Mn-carbonate) and pyritegalena-sphalerite and lesser chalcopyrite. Mineralized vein systems are haloed by
phyllic and/or potassic alteration assemblages, situated within near-vein “cores” of
silicification (replacement) and broad argillic alteration zones. Volcanic stratigraphy,
fault/fracture networks and andesitic/dacitic domes are primary controls to the
localization of epithermal mineralization.
DEPOSITS (Mineralized Prospects): The precious metal-bearing Shumigan vein
system has a strike extent of over 1.2 km and a depth extent of 330 m as outlined by
drilling and surface trenching. The recognition of dextral-oblique dilation zones as the
primary control to high-grade gold-silver mineralization at Shumigan has only recently
been documented and plays an important role for exploration vectoring at other
noteworthy intermediate-sulfidation prospects within the Unga Gold Project.
The Shumigan breccia is interpreted to be a phreatomagmatic (magmatic-hydrothermal)
intermediate-sulfidation breccia system that has been localized along the Shumigan
Scarp; a northeast oriented steeply southeast dipping faulted contact between a body of
coherent basaltic-andesite (footwall) and a hangingwall sequence of dacitic pyroclastic
flows and overlying epiclastic sediments. A complex arrangement of steeply-standing
phreatomagmatic breccias and dikes were also emplaced along this contact and are
interpreted to be pre- to syn-mineral.
DISPLAY: One Core Box and a variety of hand samples displaying typical rock samples
from the Shumigan Prospect. Cross sections and maps to illustrate the prospect
accompany the core.