The Shamrock Property consists of 40 unpatented load claims, accessible by paved road, covering approximately 758 acres and located 20 miles northwest of Medford, Oregon (Figure 1). More detailed information can be found in the link below to a 43-101 report prepared by D.E. Cameron for Northwest Nickel and having an effective date of March 1st, 2023.
The area was first prospected in the early 1900s, when a 60 ft-deep inclined shaft was excavated to intersect the main Shamrock showing containing nickel (Ni), copper (Cu), cobalt (Co), and platinum (Pt). Underground development occurred during 1949-50 by the U.S. Bureau of Mines (USBM). USBM completed eleven diamond drillholes totaling 3,419 ft and outlined a lens of nickel-copper sulphide 325 ft long, 200 ft deep and 3-25 ft thick. A 200-lb composite sample was submitted for metallurgy and assayed 1.3% Ni, 1.1% Cu, 0.07% Co and 0.03 oz/t Pt. In 1952-53 USBM removed 101.5 tons of manganese- (Mn) and iron-rich (Fe) material from previously discovered pods for metallurgical sampling with assays returning 23.1-32.3% Mn and 2.06-3.70% Fe.
Nickel-copper mineralization can be traced along strike for 1,500 ft north-south, 500 ft east-west and contains two mineralized lenses (Figure 2). Ultramafic rocks were intersected in drilling and consist predominantly of peridotite and related serpentinite as well as norite and diorite. The best mineralization is present in a coarse-grained norite. Sulphide mineralization includes pyrrhotite, pentlandite, chalcopyrite and pyrite. A bulk flotation program recovered 92.3% of the Ni, 89.4% of the Cu and 51.3% of the Pt.
Figure 1
Figure 2
