Gosowong is gold mining in Indonesia, and this mine located in Halmahera Island, in the North Maluku Province at Indonesia country, one the country with the world's largest gold mine, the Grasberg mine in Irian Jaya. Gosowong mine is owned and operated by PT Nusa Halmahera Minerals (PTNHM), an Indonesian company 75% owned by Newcrest and and PT Aneka Tambang (25%)
Prior to Gosowong mine at exploration in 1992 by Newcrest, there is no previous history of gold mining or record of gold mineralisation at Gosowong existed. In 1992, Newcrest and its joint venture partner, PT Aneka Tambang ( ANTAM ) commenced joint exploration at Halmahera and adjacent islands. And the Gosowong is a mining permit, called a Contract of Work was granted by the Indonesian Government in 1997, continues until at least 2029
Gosowong mine currently encompasses the Kencana and Toguraci underground mines.
Kencana underground mine
The Kencana underground mine was the first underground mine to be developed at Gosowong mine. In July 2005 decline development commenced and the first ore was mined at Gosowong in March 2006. Kencana underground mine in Gosowong uses the Under Hand Cut-and-Fill (UHCAF) mining method with some long hole stoping. UHCAF is a system of excavation and back-filling where the veins of ore are mined out (so as to become a tunnel), then back-filled with a mix of tuff, sand and cement. The UHCAF system is safer and more environmentally friendly than other conventional systems of underground mining.
Toguraci underground mine
The Toguraci underground mine is the second underground mine to be developed at Gosowong. Development commenced in May 2011 and the first ore was mined at Toguraci underground mine in September 2011. The mining method in Toguraci underground is mainly long hole stoping with some Over Hand Cut-and-Fill. Ore drives are mined 15 meters above each other to form a stope block which is then drilled out with vertical holes using a Production Drill Machine. The holes are then charged with explosives and fired with the ore falling to the bottom ore drive. A loader then removes ("bogs") the ore to a haul truck. This cycle continues until the stope block has been mined out
Gold Processing In Gosowong Mine
The gold processing plant at Gosowong mine has the capacity to treat mineral ore up to a maximum of 800,000 Dry Metric Tonnes of mineral ore annually at a typical head grade of 15 grams of gold per tonne.
Processing of mineral ores in Gosowong through several stages of processing, and all primary infrastructures at the Gosowong mine plant consists of a run-of-mine ore blending pad, wobbler feeder.
Crushing process comprises a primary jaw crusher After the crushing process, mineral ore is then transferred to the semi-autogenous grinding (SAG) and ball mill circuit is part of the primary stage in the grinding process, along with water, steel balls and the addition of lime to raise the pH of the ore. The grinding process reduces the rock to a make slurry for cyanide leaching process.
Gravity gold concentration circuit in Gosowong mine is the apparatus is used for the recovery of fine particles of free gold, the gold that does not require gold cyanidation for recovery
The processing of mineral ores then undergoes a conventional cyanide leaching process. Gold and silver is recovered from the cyanide solution using the Merrill-Crowe zinc precipitation process.
The gold and silver concentrates are then filtered and smelted in Gosowong's gold room facilities to produce gold and silver bullion or dore . The gold dore is then refined at Logam Mulia which is owned by Newcrest’s joint venture partner PT Aneka Tambang
The Kencana underground mine was the first underground mine to be developed at Gosowong mine. In July 2005 decline development commenced and the first ore was mined at Gosowong in March 2006. Kencana underground mine in Gosowong uses the Under Hand Cut-and-Fill (UHCAF) mining method with some long hole stoping. UHCAF is a system of excavation and back-filling where the veins of ore are mined out (so as to become a tunnel), then back-filled with a mix of tuff, sand and cement. The UHCAF system is safer and more environmentally friendly than other conventional systems of underground mining.
Toguraci underground mine
The Toguraci underground mine is the second underground mine to be developed at Gosowong. Development commenced in May 2011 and the first ore was mined at Toguraci underground mine in September 2011. The mining method in Toguraci underground is mainly long hole stoping with some Over Hand Cut-and-Fill. Ore drives are mined 15 meters above each other to form a stope block which is then drilled out with vertical holes using a Production Drill Machine. The holes are then charged with explosives and fired with the ore falling to the bottom ore drive. A loader then removes ("bogs") the ore to a haul truck. This cycle continues until the stope block has been mined out
Gold Processing In Gosowong Mine
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The gold processing plant at Gosowong mine has the capacity to treat mineral ore up to a maximum of 800,000 Dry Metric Tonnes of mineral ore annually at a typical head grade of 15 grams of gold per tonne.
Processing of mineral ores in Gosowong through several stages of processing, and all primary infrastructures at the Gosowong mine plant consists of a run-of-mine ore blending pad, wobbler feeder.
Crushing process comprises a primary jaw crusher After the crushing process, mineral ore is then transferred to the semi-autogenous grinding (SAG) and ball mill circuit is part of the primary stage in the grinding process, along with water, steel balls and the addition of lime to raise the pH of the ore. The grinding process reduces the rock to a make slurry for cyanide leaching process.
Gravity gold concentration circuit in Gosowong mine is the apparatus is used for the recovery of fine particles of free gold, the gold that does not require gold cyanidation for recovery
The processing of mineral ores then undergoes a conventional cyanide leaching process. Gold and silver is recovered from the cyanide solution using the Merrill-Crowe zinc precipitation process.
The gold and silver concentrates are then filtered and smelted in Gosowong's gold room facilities to produce gold and silver bullion or dore . The gold dore is then refined at Logam Mulia which is owned by Newcrest’s joint venture partner PT Aneka Tambang
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