The 10,252-hectare Willow property is located approximately 65 km southeast of Reno, Nevada and 13 km due west of Yerington, Nevada, in the Buckskin Mountain Range. The property was acquired in February of 2017 in an option agreement with Almadex Minerals. The Nev-Lorraine claims are contiguous and wrap around the far southeast corner of Willow. Nev-Lorraine is subject to a separate lease agreement with private landowners signed in February 2018.
Willow and Nev-Lorraine occur in the western portion of the historic Yerington Copper Camp. Both properties were explored in the 1960s to the early 1980s by Anaconda Mining, Bear Creek Mining and Conoco, to identify a porphyry copper deposit analogous to the nearby Yerington Mine which produced approximately 1.6 billion pounds of copper from 1952 to 1978 for Anaconda Mining. Year-round access from Yerington is along paved roads leading to well-maintained gravel roads that skirt the claims. A series of old drill roads provides good access to the entire combined property.
Four porphyry copper deposits and numerous Cu-Fe and Cu-Au skarns have been identified to date in the Yerington camp. The porphyry deposits are Yerington, Ann Mason, Bear-Lagomarsino and MacArthur. The main skarns are Pumpkin Hollow and the Mason Valley, Bluestone and Malachite Mines.
The only porphyry to go into production was the Yerington deposit, which contained approximately 162 MT of 0.6% Cu. Recent exploration under the old pit has been carried out by Quaterra Resources, who also control the adjacent Bear-Lagomarsino and MacArthur porphyries. The Bear-Lagomarsino deposit contains > 500 MT of 0.4% Cu, while MacArthur has an M&I oxide resource of 159 MT at 0.212% Cu. Quaterra initiated a Prefeasibility study on MacArthur in December of 2017. The other large porphyry in the camp is Ann Mason with an M&I resource of 1.4BT at 0.32% Cu, owned by Mason Resources. The Ann Mason property is contiguous to Willow to the east.
Some of the earliest production at Yerington occurred from skarns. The Mason Valley, Bluestone and Malachite Mines produced approximately 3.8 Mt grading 1.5%--6.2% Cu from 1910-1931. The Pumpkin Hollow skarn/Fe-oxide deposit is currently being developed by Nevada Copper. It contains a P&P resource of 572 MT at 0.4% Cu.