Draft:Golovyn labradorite deposit
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The Golovynske Labradorite deposit is one of the largest deposits of labradorite in Ukraine, located in the town of Golovyn, Zhytomyr region. It is known for its decorative stone with a distinctive blue iridescence - Volga Blue labradorite, which is one of the most elite facing materials.
History
[edit]The deposit was discovered in 1840 by Kyiv doctor Shirmer. The first scientific references belong to the geologist Seget, and later to Professor V.E. Tarasenko. Commercial production began in 1894 on the initiative of landowners Salis and Dushynskyi. In 1896, the first stone processing factory was built in the village of Holovyne. In the 1930s, the company developed intensively, in particular, in the production of facing slabs for government buildings.
In 1932, the company set up a school for students, which later became the only school in the USSR to train granite processing specialists. During the Second World War, the deposit was exploited by the occupation authorities. After the war, the company was restored.
In the 1960s, the company underwent a large-scale reconstruction of its production facilities using state-of-the-art equipment.
Modernity
[edit]In 2019, the company was privatised[1] and transferred to the ownership of Golovinsky Stone LLC[2], a member of the GOLOVINSKI Group. Since then, the company has been modernising its production facilities with the use of equipment from leading global brands. The company's speciality is the production of large-format slabs of Volga Blue labradorite up to 3×2 metres in size.
The company's products have been exported to many countries and are used in the architecture of cities in Europe, Asia, North America and the Middle East.
Characteristics
[edit]The balance reserves of labradorite are 3.5 million m³. The deposit is confined to the massif of basic igneous rocks that occur among the crystalline rocks of the Ukrainian crystalline shield. In the east of the deposit, the labradorite changes to gabbro. The thickness of the productive layer is 10-15 m, and the weathered zone is 2-4 m. Golovinsky labradorite is a massive black coarse-grained rock consisting of idiomorphic tabular or lamellar grains; the main rock-forming mineral is labradorite (85-95% of the rock); in addition, the rock contains pyroxenes, olivine, and biotite. The number of labrador crystals with sizes up to 70-100 mm reaches 100 pcs. per 1 m². The main physical and mechanical properties of labradorite g.p. are: temporary compression resistance (in dry state) 100-120 MPa, average density 2790 kg/m³, water absorption 0.33%, abrasion 0.68 g/cm². It is well processed by diamond and abrasive tools; it is well polished up to 170 units of the gloss meter scale.
Development technology
[edit]The deposit was opened by a capital trench in the inner part of the deposit and is developed by 2 horizons. The height of the mining ledges is 3-10 m, the width of the working areas is 3-5 m. Blocks are extracted using a two-stage scheme, taking into account natural fractures in the rocks. The monoliths are broken away from the massif by drilling and blasting using black powder. Hydraulic wedge units are used to split the monoliths.
Prior to privatisation, the blocks were mined by drilling and blasting using smoke powder. The monoliths were separated from the main massif by means of explosions, and hydraulic wedges were used for further splitting. This method often led to cracks in the stone and significant losses of valuable rock. Following the modernisation of the enterprise in 2019, the quarry started using the diamond wire saw technology. It allows us to ‘cut’ the monolith without noise and explosions, extracting large, even blocks without damage and with minimal material loss.
Notes
[edit]- ^ "Home". Golovinski. Retrieved 2025-05-01.
- ^ "42890500 — ТОВ ГОЛОВИНСЬКИЙ КАМІНЬ". opendatabot.com (in Ukrainian). 2025-04-22. Retrieved 2025-05-01.
- Mining encyclopaedic dictionary : у 3 т. / edited by V. S. Biletsky. — Page Template:Шаблон:Comment/styles.css has no content.Д. : Eastern Publishing House, 2004. — Т. 3. — 752 с. — ISBN 966-7804-78-X.