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Carlin Trend Gold Mine, NV, USA

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Carlin Trend Gold Mine, NV, USA

Carlin Trend Gold Mine, NV, USA

Newmont Corp. started Carlin Nevada USA 1965 thereafter built position state. Newmont Company later became company's major asset acquisition Santa Fe Pacific 1997 increased Newmont's options optimising processing. 2001 Newmont acquired Battle Co. 2002 Normandy Mining further extending its exploration Nevada. 2002 Newmont owned controlled 7,915km² along Interstate 80.

Mining started pits extended underground 1994. Processing methods according type. 2005 company operated 13 pits underground mines 14 active processing facilities Nevada. Most including Leeville (where development production started Q3 2005 totalling 16,000oz year-end) located Carlin Trend Elko exploiting unique mineralisation identified Newmont 1964.

The Twin Creeks Lone Complex Winnemucca region further west Phoenix / copper project processing started building rate output 350,000–420,000oz/y around 21,000t/y copper Battle Mountain.

GEOLOGY RESERVES

'Carlin type' deposits comprise strata-bound disseminated mineralisation occurring carbonate rocks palaeozoic metamorphosed varying extents. usually structurally controlled.

"As electricity price key contributor cost increases Newmont building 203MW station Elko."

Mineralisation predominantly oxides sulphides refractory carbonaceous sulphides type determines treatment route. High-grade oxide sulphide treated conventional milling cyanidation lower-grade oxides Newmont developed heap-leaching technology. Similarly proportion refractory ores cannot processed conventional methods company completed roasting higher grades proprietary bio-oxidation system lower grades 1994. Refractory carbonaceous content treated bio facility ammonium thiosulphate leaching. Winnemucca operations autoclaves pre-treat refractory ores.

At end-2005 Newmont's total Nevada proven probable reserves calculated 33.3Moz (equity). Phoenix reserves increased 3Moz 408,150t copper Newmont acquired property.

MINING

Open-pit mines remain major source Carlin Trend ore. Carlin original pit Quarry opened 1985 supplemented Tusc satellite pit 1994 largest. major pits Genesis Post Bootstrap Beast Lantern Sold opened 1995. conventional using shovels haulers.

Underground mining higher-grade down-dip existing pits started 1994 extensions Carlin. Rain works oxide ores longhole stoping extension depleted pit extension Genesis. Post started 2001 produced 227,000oz its year its portal located within Barrick Goldstrike's Betze/Post pit.

2002 development 700m-deep Leeville deposit reported reserves 2.7Moz hoisting scheduled mid-2006 1900t/d end-2006: full-rate output 500,000–l550,000oz/y eight years. Newmont using MineStar manage its Nevada operations.

ORE PROCESSING

The process plants available using Newmont proprietary technology provide considerable flexibility: linear programme helps types offering highest economic return. Newmont groups its Nevada process units follows:

Oxide mills: Carlin Trend mill 5; Midas Twin Creeks; Lone Tree

Refractory mills: Carlin bio-leach (mill 5) Carlin roaster (mill 6); Lone flotation Twin Creeks Lone autoclaves

Dump Leach operations: Carlin-oxide Carlin-refractory; Twin Creeks Lone oxide

Although Newmont processes types proportion recovered refractory ores rose 30% 1996 66% 2002.

PRODUCTION

In 2005 Newmont's Nevada pits mined 175Mt material underground mines 1.42Mt. oxide mills processed 4.20Mt averaging 4.3g/t gold refractory mills 8.15Mt averaging 6.8g/t leach dumps 17.5Mt averaging 0.9g/t total output 2.46Moz gold. company’s consolidated Nevada sales 3.7% 2.44Moz applicable cash costs rose 18.1% US$333/oz. electricity price key contributor cost increases Newmont building 203MW station Elko expects save US$20/oz total cash costs completed 2008.


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