Wetar Island

Written by on October 1, 2010 in Maluku Maps with 0 Comments

Moluccas Wetar Island

The first copper plating cathode has been produced at Finder Resources Wetar Copper Project. Copper plating began on early February by electrowinning circuit at Wetar Copper demonstration plant.

Minor electrical failure in electrowinning circuit has been remedied and the plant resumed plating production a week later. The plating was expected produce 5 tonnes per day of copper cathode by the end February. All other operations including mine, crushing, stacking, irrigation and solvent extraction are operating in line with design specification.

Wetar Copper Project was acquired by Finder Resourcec (85% shares) in corporation with PT.Batutua Kharisma Permai (BKP). The Wetar deposit was discovered by CSR Ltd and then sold to Billiton Indonesia (BMI) in 1988, then BMI carried out extensive drilling to define two gold-silver mineralization in two deposit, Kali Kuning and Lerokis. BMI also discovered copper mineralization underlying in both deposit and smaller satellite deposit at Meron, 2km from Kali Kuning.

Based on previous drilling data, Kali Kuning and Lerokis have independently estimated Measured, Indicated and Inferred Mineral Resources of 9.8 million tonnes, grading 2.5% Cu and 0.7 g/t Au, using a 0.5% Cu cut-off grade. Gold-silver-barite ores were mined by BMI from shallow open pits at Lerokis and Kali Kuning over the period 1990-1997.


North central Wetar coast, southwest Maluku, Ilputih village; south central Wetar coast, Lurang village. Alternate names: Ilputih, Opotai, Tutunohan. Dialects: Ilputih, LuraAputaing, Welemur. Lexical similarity: 93% among dialects, 79% with Perai [wet], 74% with Tugun [tzn], 69% with Ili’uun [ilu], 57% with Talur [ilw].

Ili’uun 1.400

Southwest Maluku, Wetar Island coast, Telemar, Karbubu, Klishatu, Ilmaumau, Erai (Eray), Nabar, Esulit villages on the west end of Wetar, and Istutun village on Lirang Island, southwest tip of Wetar. Alternate names: Erai, Hahutan, Hahutau, Iliun, Ilmaumau, Limera. Dialects: Telemar, Karbubu, Ustutun, Klishatu, Ilmaumau, Eray, Nabar, Esulit. All also use the Ili’uun dialect. Lexical similarity: 93%–97% among dialects. Lexical similarity 73% with Tugun [tzn], 69% with Aputai [apx], 67% with Perai [wet], 51% with Talur [ilw]

Perai 280 Animism

Wetar Island northeast coast, north of Timor, Uhak and Moning villages. Alternate names: Tutunohan. Dialects: Moning, Uhak. Lexical similarity: 93% among dialects, 79% with Aputai [apx], 76% with Tugun [tzn], 67% with Ili’uun [ilu], 51% with Talur [ilw].

Talur 680

south central Wetar Island north of East Timor, Hiay, Ilputih, Ilwaki villages. Alternate names: Galoleng, Iliwaki, Ilmedu, Ilwaki, Lir Talo. Dialects: Ilputih, Ilwaki (Iliwaki), Hiay. Lexical similarity: 94%-98% between dialects, 86% with Galoli [gal] in East Timor, 57% with Aputai [apx], 52% with Tugun [tzn], 51% with Perai [wet] and Ili’uun [ilu].

Tugun 1.200 Animism

1% monolinguals. Southwest Maluku, north of Timor, southeast end of Wetar Island, Mahuan, Masapun, Tomliapat, Ilpokil, Kahailin, Ilway, Arwala villages. Alternate names: Mahuan, Tutunohan. Dialects: Mahuan, Masapua, Tomliapat, Ilpokil, Kahailin Ilway, Arwala. Lexical similarity: 92%–97% among dialects, 76% with Perai [wet], 74% with Aputai [apx], 73% with Ili’uun [ilu], 52% with Talur [ilw].


Wetar-Island-01Wetar Island


Lintan Island




Kelapa Tiga Creek

3 pictures from Serge and Mia Bondue



Nature Reserve


Crocodiles in the lake with no scientific name yet



Wetar Copper Project

The Wetar Copper Project comprises the development, mining and processing of sulphide copper deposits at Kali Kuning and Lerokis located on Wetar Island, Indonesia.

Mining will be carried out by conventional open pit methods initially at Kali Kuning and from Year 3 also at Lerokis with ore hauled from the open pits to the Kali Kuning ROM pad.

Finders has operated a 1,825 tpa Cu demonstration plant on site that incorporates heap leaching, solvent extraction (SX) and electrowinning (EW) in its flowsheet. The demonstration phase of the Wetar Copper Project was successful, significantly de-risking the technical aspects of the project, with the following key achievements:

  • The plant achieved nameplate production during the first six months of 2010; an outstanding accomplishment which reflected the efforts of the site team to optimize heap and plant performance during the latter half of 2009.
  • Recoveries from Heap 3 exceeded DFS design reaching 80% copper recovery after ~21 months.
  • Reconciliation of heap residual material confirmed leaching of chalcopyrite, covellite and chalcocite. The confirmed chalcopyrite leaching is a global first for Finders.
  • Effective testing of all aspects of the planned commercial operation from mining to logistics and international sales, including training and development of local staff.
  • Over 1.2 million work hours have now been completed on the project with only 3 lost-time injuries.

The Expanded Demonstration Plant (EDP) project phase involves the expansion of the existing heap leach SX EW demonstration plant to a nominal capacity of 7,000 tpa of cathode copper. The EDP will be operated in conjunction with the Main 18,000 tpa SX-EW Plant relocated from Whim Creek. Neutralisation is also included, as the demonstration heap leach has shown that the ore is acid generating rather than acid consuming.

The processing route for the ore has been designed to handle up to 1.65 Mtpa of sulphide ore to produce a total of 25,000 tpa of LME A Grade copper cathode from both plants.

The Updated Bankable Feasibility Study (Updated BFS) describes the technical and financial position of the project as at May 2012. Key outcomes are as follows:

Updated BFS May 2012

Ore Reserves 1 8.2 MT

Strip Ratio 0.86

Initial Mine Life 9.2 years

Ave Cu Grade 2.5%

Cathode Production Capacity 25,000 tpa

LOM Cathode Production 150,000 t

Average Copper Recovery 75%

Operating Cash Cost (LOM) 2 US$1.07/lb

Capital Costs (including S17m accuracy provision) US$167.4m


  1. There is an additional 0.2MT of Inferred Resource within the pit shell not included in the above Ore Reserves
  2. Operating Cash Costs exclude royalties (4%), head office costs and marketing costs (expected to be zero after netting off sales premiums)

Tags: , , , , , ,


If you enjoyed this article, subscribe now to receive more just like it.

Subscribe via RSS Feed

Leave a Reply