Ijen

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Ijen in 3D

Map of Ijen Crater, where sulfur is mined

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The Ijen volcano complex is a group of composite volcanoes located on the border between Banyuwangi Regency and Bondowoso Regency of East Java, Indonesia. It is known for its blue fire, acidic crater lake, and labour-intensive sulfur mining.

It is inside an eponymous larger caldera Ijen, which is about Template:Convert wide. The Gunung Merapi stratovolcano is the highest point of that complex. The name "Gunung Merapi" means 'mountain of fire' in the Indonesian language; Mount Merapi in central Java and Marapi in Sumatra have the same etymology.

Ijen Geopark stretches across the entire regency which is specifically in the Mount Ijen area, Pulau Merah Beach, and Alas Purwo National Park. It has various geological, biological, and cultural sites. It became part of UNESCO Global Geoparks in 2023.

West of Gunung Merapi is the Ijen volcano, which has a Template:Convert turquoise-coloured acidic crater lake. The lake is the site of a labour-intensive sulfur mining operation, in which sulfur-laden baskets are carried by hand from the crater floor. The work is paid well considering the cost of living in the area, but is very onerous.<ref>Template:Cite news</ref> Workers earn around US$13 per day and, once out of the crater, still need to carry their loads of sulfur chunks about three kilometers to the nearby Paltuding Valley to get paid.<ref>Template:Cite news</ref>

Many other post-caldera cones and craters are located within the caldera or along its rim. The largest concentration of post-caldera cones runs east–west across the southern side of the caldera. The active crater at Kawah Ijen has a diameter of Template:Convert and a surface area of Template:Convert. It is Template:Convert deep and has a volume of Template:Convert.

The lake is recognised as the largest highly acidic crater lake in the world.<ref name=gvp>Template:Cite gvp</ref> It is also a source for the river Banyupahit, resulting in highly acidic and metal-enriched river water which has a significant detrimental effect on the downstream river ecosystem.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> During a scientific expedition in 2001, the pH of the lake was measured at <0.3. <ref>Template:Cite journal</ref> On July 14–15, 2008, explorer George Kourounis took a small rubber boat out onto the acid lake to measure its acidity. The pH of the water at the lake's edges was measured to be 0.5 and in the middle of the lake 0.13 due to a high concentration of sulfuric acid.<ref>Boating on acid</ref>

Blue fire craterEdit

Template:See also Since National Geographic mentioned the electric-blue flame of Ijen, tourist numbers have increased.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> The phenomenon has long been known, but midnight hiking tours are a more recent offering. A two-hour hike is required to reach the rim of the crater, followed by a 45-minute hike down to the bank of the crater.

The blue fire is ignited sulfuric gas, which emerges from cracks at temperatures up to Template:Convert. The flames can be up to Template:Convert high; some of the gas condenses to liquid and is still ignited.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Ijen is the largest blue flame area in the world. Local people refer to it as Api Biru (Blue Fire).<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> The other location at which blue fire can be seen is in Dallol Mountain, Ethiopia.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Sulfur mining at IjenEdit

An active vent at the edge of the lake is a source of elemental sulfur and supports a mining operation. Escaping volcanic gases are channeled through a network of ceramic pipes, resulting in condensation of molten sulfur.Template:Citation needed

The sulfur, which is deep red when molten, pours slowly from the ends of these pipes and pools on the ground, turning bright yellow as it cools. The miners break the cooled material into large pieces and carry it away in baskets. Miners carry loads ranging from Template:Convert up Template:Convert to the crater rim, with a gradient of 45 to 60 degrees, and then Template:Convert down the mountain for weighing. Most miners make this journey twice a day.

A nearby sulfur refinery pays the miners by the weight of sulfur transported; as of September 2010, the typical daily earnings were equivalent to approximately $13 US. The miners often receive insufficient protection while working around the volcano<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> and complain of numerous respiratory afflictions. There are 200 miners, who extract 14 tons per day — about 20% of the continuous daily deposit.<ref>Template:Cite news</ref>

MediaEdit

{{ safesubst:#invoke:Unsubst||date=__DATE__ |$B= {{ safesubst:#invoke:Unsubst||date=__DATE__ |$B= Template:Ambox }} }} Ijen and its sulfur mining was featured in the 1991 IMAX film Ring of Fire, and as a topic on the 5th episode of the BBC television documentary Human Planet.

In the documentary film War Photographer, journalist James Nachtwey visits Ijen and struggles with noxious fumes while trying to photograph workers. Michael Glawogger's film Workingman's Death is about sulfur workers.

GalleryEdit

Kawah Ijen volcano, Java.jpg

Kawah Ijen volcano and crater lake, Java, viewed from Landsat 8
The cauldron of Ijen Mountain, Indonesia.jpg

The sulfuric lake of Kawah Ijen Mountain's cauldron, Indonesia
Mount Merapi Ijen A.JPG

Mt. Merapi, Ijen
Ornament of sulfur.jpg

Sulfur ornaments from Ijen mines
The blue fire of Kawah Ijen 1.jpg

The "blue lava" of Kawah Ijen
Kawah Ijen sulfur mining - Indonesia.jpg

Kawah Ijen sulfur mining
Kawah Ijen sulfur miner - Indonesia.jpg

Kawah Ijen sulfur miner
Kawah Ijen - Indonesia.jpg

Kawah Ijen

ReferencesEdit

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External linksEdit

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