The Rurimarac project (Tinka 100%) is located 35km southwest of Barrick's Pierina gold mine (10 million ounces gold) in the Ancash region of central Peru. High-grade gold (up to 52 grams per tonne gold) occurs in outcrops of breccia and altered shale at the Rurimarac project, consisting of 2,000 hectares. Gold mineralization is hosted by altered and oxidised fault breccia at the contact between Tertiary diorite and Jurassic Chicama Formation shale. Silicified zones within the breccia expose pyrite and arsenopyrite. Surface pits and trenches (65 samples) average 5.1 grams per tonne gold within a geochemical gold anomaly covering 1000 metres x 300 metres. One past Tinka drill hole partially tested the mineralized structure - LDD5 drilled 6 metres of 3 grams per tonne gold from 60 metres depth in oxidised rock. The breccia zone is interpreted to have a low plunge angle (30 degree) . Further drilling is required to adequately test the central part of the geochemical gold anomaly.
Location Map of the Rurimarac Project in Central Peru
Location in Peru
The Rurimarac project is located 40km from the township of Huaraz, in the central Peru gold mining district of the Cordillera Negra.
The Pierina gold mine lies 35km to the north, and the Antamina project 60km to the east.
The project is well supported by road networks at a modest 3000-3600m altitude.
Rurimarac was explored by two junior Canadian companies over the last 10 years. Six diamond drill holes were drilled at the property. Only one hole targeted the surface gold anomaly (LDD5), while the other 5 holes tested IP anomalies in the basement rocks. The IP anomalies are believed to be unrelated to the gold mineralization. Darwin is currently negotiating a drill access agreement with the community.
The Cretaceous Chicama Group is composed of carbonaceous and pyritic shales with minor limestones and quartzitic sandstones. These rocks form the basement to the mineralisation ("footwall").
The sedimentary sequence is intruded by sills of diorite and granodiorite of Tertiary age. Mineralisation occurs near the contact of the Chicama Group rocks and the upper diorite. See geology map below.