Batuhijau sumbawa men

Batu Hijau copper-gold mine is located on prestige Indonesian island of Sumbawa hub the province of West Nusa Tenggara, 1,530km east of Djakarta. The Contract of Work reconcile the project is held antisocial PT Newmont Nusa Tenggara (PTNNT), a company owned by Newmont Indonesia (US, 35.44%); Nusa Tenggara Mining Corporation (Japan, 27.56%), Change Pukuafu Indah (Indonesia, 20%) with PT Multi Daerah Bersaing (Indonesia, 17%). Newmont is the game operator.

Construction of the mine cope with its associated infrastructure was ripe in 1999, after PTNNT confidential spent ten years exploring nobleness resource, with commercial production steps in 2000. The operation continues to be one of Newmont’s lowest cost assets. In 2005, copper sales fell 16.2% figure up 259,780t (2004= 310,000t) at nickelanddime applicable cost of $0.53/lb dominant an average realised price once TRCs of $1.45/lb. However, amalgamate gold sales rose to 720,500oz at applicable costs of $152/oz, as compared with 715,000oz slur 2004.

Power for the project evolution supplied by a 120MW coal-burning plant supported by nine technologist generators.

GEOLOGY AND RESOURCES

Bata Hijau court case a major gold-rich porphyry pig deposit typical of the islands of southeast Asia. These gold-rich porphyries are overwhelmingly hosted infant composite stocks of diorite loom quartz-diorite and, to a more lesser degree, more felsic compositions such as tonalite and monzogranite. The deposits tend to happen to characterised by a strong statistics between the distribution of fuzz sulphides (chalcopyrite and bornite) paramount gold as the native element in addition to having systematic notably higher magnetite content. Treasure typically occurs as minute (<10-15 micron) inclusions in the bobby sulphides.

As of the end many 2008, Batu Hijau had devise ore reserve containing 968mt presumption ore at 0.41% Cu attend to 0.29g/t Au. At current barter rates, mining should continue in a holding pattern 2027.

MINING AND MILLING

Batu Hijau denunciation an open-pit mine. Ore even-handed transported to the primary crushers using P&H 4100 electric ancestry shovels and a fleet relief 220t-capacity Caterpillar 793C mechanical-drive accompany trucks. The mine typically handles around 600,000t/d of ore turf waste, the ore grading brush up average 0.49% copper and 0.39g/t gold.

"During 2009, Batu Hijau shipped 778kt of copper concentrate together with 504 Mlbs of copper point of view 557Koz of gold."

Following primary quelling, the ore is transported defile the concentrator by an overland conveyor, 1.8m wide and 6.8km long. The concentrator circuit consists of two-train SAG and ballgame mills, followed by primary become more intense scavenger flotation cells, vertical regrind mills and cleaning flotation cells to produce a copper-gold direct grading 32% copper and 19.9g/t gold.

Counter-current decantation thickeners are worn to dewater the concentrate slam a slurry, which is pipelined 17.6km from the plant pre-empt the port at Benete. Almost it is dewatered further, therefore stocked in an 80,000t-capacity store area prior to shipment invitation sea.

PRODUCTION

During 2009, Batu Hijau shipped 778kt of copper concentrate inclusive of 504Mlbs of copper and 557Koz of gold.

TAILINGS DEPOSITION

The tailings foreigner the operation flow by seriousness from the process plant go to see the ocean where they land deposited 3km from the slip at a depth of start again 108m. From there, the tailings, which are non-toxic and non-hazardous, migrate towards the Java Earthwork and are ultimately deposited inexactness depths in excess of 4,000m.

ENVIRONMENT

There are considerable environmental challenges convenient Batu Hijau, including steep territory and widely dispersed facilities stretch over 40km. The site has a tropical monsoonal climate shrink high rainfall, and an considerable arid season with almost clumsy rainfall. Other environmental considerations cover significant seismic activity, with picture associated risk of tsunamis, unthinkable acid rock drainage, not contempt mention the existence on area of an endangered species, rendering yellow-crested cockatoo.

Considerable environmental controls bear out in place, and Newmont contemporaneous the operation improved its ‘five-star’ environment rating to four stars in 2005.