Phoenix is a skarn-hosted polymetallic massive sulfide replacement deposit.

Au-Cu-Ag-Pb-Zn skarn mineralization at Phoenix is centered about the Eocene Copper Canyon granodiorite porphyry stock. Paleozoic sedimentary rocks within two miles of the stock have undergone strong thermal metamorphism (hornfels) and metasomatism (skarn). Metal zonation is manifest by a CuMo core close to the stock grading outward into proximal Cu-Au-Ag, Au-Ag and distal Pb-Zn-Ag mineralization.

The Lone Tree gold deposit, Nevada is hosted in Paleozoic calcareous sedimentary rocks. Mineralization is dominantly controlled by high-angle normal faults and fracture sets, as is alteration. Mineralization occurs in the form of disseminations, micro and macro veins, and as a matrix to angular breccia clasts. The paragenesis of minerals indicate four stages of mineralization. The first stage is identified by brecciated quartz and minor pyrite. The second stage is the main gold stage of mineralization comprising quartz veins, kaolinite, pyrite, marcasite, arsenopyrite, gold, sphalerite, and chalcopyrite.This is overprinted by a third stage economic gold mineralization along with barite and pyrite. Free gold grains in stage 2 occur in a quartz and clay mineral assemblage in association with pyrite. The last stage is supergene mineralization producing covellite, chalcocite, native copper, hematite, and goethite.

Main alteration types are decarbonatization, silicification by multiple generations of silica, and argillization due to the development of kaolinite, illite/smectite, and alunite.

Gold mineralization at the Lone Tree deposit is primarily confined to fault zones and fracture sets, where sedimentary host rocks experienced decarbonatization, silicification (by repeated introduction of hydrothermal silica), and argillization (by development of clay minerals especially hypogene kaolinite).

Phoenix is an open pit operation, located approximately 10 miles south of Battle Mountain, Nevada and can be accessed by paved highway to a Newmont maintained dirt road. It includes the Phoenix, Midas, Reona, and Iron Canyon open pits and excavation of the existing Northeast Extension, Tomboy, Midas, and Fortitude gold ore stockpiles.

The Phoenix surface mine’s available mining fleet consists of three shovels and twenty 240 ton haul trucks.

Lone Tree is an open pit operation, located approximately 20 miles northwest of Battle Mountain, Nevada and can be accessed by paved highway. Lone Tree’s available mining fleet consists of two haul trucks, which range from 150 tons to 190 tons, to rehandle leach material for residual leaching operations.

The Phoenix mill is both a copper concentrator and a gold cyanidation plant. Tonnage capacity of the mill varies from 33,000 to 38,000 tons per day depending on the character of the feed. Ore containing gold, copper, and silver values is processed by 1) crushing; 2) semiautogenous grinding (SAG) and ball mill grinding; 3) gravity concentration for free gold; 4) two-stage flotation to produce a copper sulfide concentrate containing copper, gold, and silver; 5) cyanidation; and 6) carbon-in-pulp (CIP) on the flotation tailings to recover gold and silver. Loaded carbon from CIP is processed by desorption and electrowinning, with the gold product from gravity concentration and electrowinning smelted off site.

Gravity concentrates are diverted to an intensive cyanidation unit (ICU) for gold recovery. Cyanide and lime are added to the CIP leach tanks for precious metal dissolution. The CIP leach tanks discharge to the CIP leach circuit, where dissolved precious metals are adsorbed ........