Other Islands of the Dodecanese.


The Island:

Yali, is a volcanic Greek island in the Dodecanese, located halfway between the south coast of Kos (Kardamena) and Nissyros. It consists of rhyolitic obsidian lava domes and pumice deposits.

The island has two distinct segments, with the northeastern part almost entirely made of obsidian and the southwestern part of pumice. These are connected by a narrow isthmus and beach made of modern reef sediments.

The island is 6 km (4 mi) long and between 4 km (2 mi) and 500 m (1,640 ft) across. It has a 180 m (591 ft) cave. The island is barren of vegetation.

The 2001 census reported a resident population of 10 people.
Administratively, it is part of the municipality of Nissyros.


The island of Yali:

Yali pumice is a highly porous volcanic stone, formed by a volcanic eruption on Nisyros island about 200,000 years ago. The island of Gyali with its deposit of Yali pumice is located between Kos and Nisyros on the Aegean Sea.

Yali is a pure white natural material with low specific gravity and excelent mechanical strength.

Originally even the Romans and Greeks used pumice long before the Christian era. In fact it can still be seen today by the many antique sculptures.

Yali pumice is characterized by its white color. The pumice grain consists to approximately 85% of air in form of ultra fine pores. This porous structure causes light weight and a low density of the raw material. These preconditions make pumice the perfect material for thermal insulation and lead to a high efficiency with the manufacturing of pumice construction materials. In addition to that the pumice of Yali island has an outstanding grain strength, which facilitates the production of high-quality products, to be used in road- and as well as in sportfield construction.

Its ability to compress well leads to a stabil subgrade, especially on a damp and soft underground.

The Mine:

For decades, the largest Greek pumice reservoir of over 120 million tons on Gyali island allows a flexible and fast production. The annual production rate currently amounts to approximately 1 million tons, about 75% of this are exported to Europe, the USA, the Middle East and Asia.

On the bases of steady mining the deposit will make Yali pumice available up to the year of 2100.

The mining is done by bulldozers using the open-cast method. For further processing the material runs over an automatic conveyor belt system. Following, on a widely distributed system of sifters the Yali pumice is separated into the individual granulations. Thereon the individual granulations are severally stored on stocks by further conveyor belts. From there the granulation will directly be loaded on the seagoing vessel by conveyor belt.

With a storage capacity of over 200,000 tons it is possible to provide Yali pumice for large projects and to ship with constant quality in a short amount of time.

The quarry on Gyali island applies highest standards of external and internal product quality control. As no other quarry in the Western Hemisphere the production is certified as to the Quality Assurance System ISO 9001 - 2000 and Yali pumice is certified to CE Mark under the standards CE EN 13055 - 1 and CE EN 13055 - 2.

Lava Mining:

LAVA Mining & Quarrying S.A., a member of the LAFARGE Group, has been engaged in mining and processing of industrial minerals since 1952. The focal point of their activity is the mining and the processing of pumice. Different granulations from the quarry at Gyali island are shipped to destinations all over the world, as well as the NAGEL Baustoff GmbH and Yali Trading & Shipping GmbH & Co. KG. Through this the LAVA Mining & Quarrying S.A. provides the local and the international market with pumice raw material of finest quality. This pumice is perfectly qualified for light weight structural elements of any type, roof planting, road construction, any other pouring as well as for plaster.

Permanent investments made by the LAVA Company and at the same time a certified and externally controlled production process takes care of a constant highly qualitative production.

Pumice Properties:

Yali is a very homogeneous pumice. The quality of Yali pumice on Gyali island has remained constant over the last 30 years. The production of six different granulations, the ability to mix one type with the other and the large stocks, which are available all over the year, give the production on Gyali island a very high flexibility and efficiency.

Production Advantages:

Production advantages together with those of the nature of the material (low bulk density, remarkably high strengh, sound-absorbing and insulating characteristics, fire resistance, uniform white colour and clearness of impurities), explain why pumice is one of the best selling light-weight aggregates in the world.

Production Range:

0 - 5 mm:
Fine pumice sand for a production of excellent white, insulating-blocs with smooth surface as well as plaster and coatings.
The pumice has a small percentage of fine material < 1mm which allows to mix this granulation easily with other materials, especially with limes.

0 - 8 mm:
Pumice sand with granular portion for the production of cement pumice building materials, which is the best way also suitable for the manufacturing of coatings and structured noble plaster.

3 - 10 mm:
Distinguished roughened pumice of medium size granulometry with small fineness, which is particularly suitable for the production of lightweight concrete elements and other cement pumice building products as well as for roof planting.

0 - 15 mm:
Best sieved and steady pumice granulation with law density and high grain strength which is particularly used for the refinement of cement pumice building products, for roof planting and the construction of roads on damp and weak underground.

Yali Island
View of Yali from the island of Nissyros.

Click on the image to enlarge.

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