The deposits that comprise the Nevada Operations are considered to be examples of Carlin-style carbonate-hosted disseminated gold–silver deposits and intrusion-related gold–copper–silver skarn deposits. Host rocks for Carlin-style deposits are most commonly thinly-bedded silty or argillaceous carbonaceous limestone or dolomite, commonly with carbonaceous shale. Although less mineralized, non-carbonate siliciclastic and rare metavolcanic rocks can locally host gold that reaches economic grades. Felsic plutons and dikes may also be mineralized at some deposits. Deposits typically have a tabular shape, are stratabound, localized at contacts between contrasting lithologies, but can also be discordant or breccia related. Mineralization consists primarily of micrometer-sized gold and sulfide grains disseminated in zones of siliciclastic and decarbonated calcareous rocks and are commonly associated with jasperoids. Major ore minerals include native gold, pyrite, arsenopyrite, stibnite, realgar, orpiment, cinnabar, fluorite, barite, and rare thallium minerals. Gangue minerals typically comprise fine-grained quartz, barite, clay minerals, carbonaceous matter, and late-stage calcite veins. Host rocks for intrusion-related gold–copper–silver skarn deposits include sedimentary carbonates, calcareous clastic rocks, volcaniclastic rocks or (rarely) volcanic flows. They are commonly related to high to intermediate-level stocks, sills, and dykes of gabbro, diorite, quartz diorite, or grano ........

Open pit mining is conducted using conventional techniques and an Owner-operated conventional truck and shovel fleet. Open pit operations include the following: South Arturo, Goldstrike, Tri-star, Gold Quarry, Cortez, Pipeline, Crossroads, Long Canyon, Phoenix, Vista and Mega.

Open pit mining is conducted using conventional techniques and an Owner-operated conventional truck and shovel fleet.

Ultimate open pit designs were developed based on pit optimization analysis. The pit limits incorporate geotechnical and hydrological recommendations into final high walls and are designed to include ramps and access to haulage routes to waste rock storage facilities (WRSFs) and processing facilities. Some deposits include phased pit designs which are used to sequence the mining operation. Phases are designed to optimize the economics of the operation and/or provide access to selected ore for blending purposes. Haul road effective widths for two-way travel range from 98–141 ft with a maximum grade of 10%. For singlelane haul roads, a minimum road width of 80 ft could be used for the bottom benches of the pit. Bench heights vary from 20–40 ft, and can be 60 ft where triple-benching is employed. Blast patterns are laid out according to material type using rock type designations.

Underground mining is currently conducted using conventional stoping methods, and conventional mechanized equipment. Underground operations include the following: Leeville, Pete Ba ........

- subscription is required.

- subscription is required.