Categories
BLOG

udachnaya pipe

RUTILE-DIAMOND INTERGROWTHS FROM UDACHNAYA KIMBERLITE PIPE (YAKUTIA)

УДК 549.514.63 : 549.211

V.M. Kvasnytsya, O.A. Vyshnevskyi

M.P. Semenenko Institute of Geochemistry,

Mineralogy and Ore Formation of the NAS of Ukraine

34, Acad. Palladin Ave., Kyiv, Ukraine, 03142

RUTILE-DIAMOND INTERGROWTHS FROM UDACHNAYA KIMBERLITE PIPE (YAKUTIA)

Language: Ukrainian

Mineralogical journal 2017, 39 (3): 17-31

Abstract: Among small diamonds from Udachnaya kimberlitic pipe (Yakutia) we found rare unique rutile-diamond intergrowths. Their morphology indicates syngenetic growth of diamond and rutile crystals. Diamond crystals are slightly colored, have different imperfect morphology: octahedron, transitional form <111>—<110>, dodecahedron. Rutile was identified by means of microprobe analysis. Red and brown- red crystals of rutile have a xenomorphic form, their size does not exceed 0.3 mm. Average chemical composition of rutile: TiO2 — 98.0 %, Al2O3 — 0.9 %, Fe2O3 — 0.3 %, Cr2O3 — traces. At high magnifications on SEM in part of rutile crystals the needle-shaped and “lens-like” exsolution lamellae, which possibly belong to Fe2O3, are fixed. A size of needle-shaped lamellae varies within 1—20 microns, thicker “lens-like” — 1—10 microns on lengthening. Also the surface of rutile crystals is covered by the different sculptures of dissolution. The quadrangular pyramidal and geometrically irregular dissolution cavities ornamented the surface of the majority of rutile crystals. Two more types of dissolution sculptures of rutile crystals surface have the appearance of “takyr” (soil), or clusters of elongated “plate-like” figures. On the basis of literary review the studied rutile is compares with rutile of different diamondiferous and diamond free associations from kimberlites and lamproites. The results of such comparison testify that the studied rutile-diamond intergrowths from Udachnaya kimberlitic pipe belong to eclogitic parageneses, id est, they serve to specify “eclogitic” environment of diamond crystals growth.

Keywords: rutile-diamond intergrowths, exsolution lamellae, eclogitic association, kimberlites, Udachnaya pipe, Yakutia.

RUTILE-DIAMOND INTERGROWTHS FROM UDACHNAYA KIMBERLITE PIPE (YAKUTIA) УДК 549.514.63 : 549.211 V . M . Kvasnytsya , O . A . Vyshnevskyi M.P. Semenenko Institute of

Udachnaya pipe

ALROSA is completing open-pit mining at the Udachnaya pipe, one of the oldest kimberlite pipes in Western Yakutia.

On 25 July 2015, the official ceremony devoted to the conservation of the Udachny open-pit was held.

The Udachnaya pipe was opened in June, 1955 and has been developed since 1967 by drilling and blasting. Udachny became ALROSA’s largest open-pit. Today, its surface area is 1,600 x 2,000 meters and it is 640 meters deep. About 350 million tonnes of ore containing rough diamonds worth around USD 80 billion were mined throughout the open-pit’s lifetime. For a long time, Udachny was considered as the flagship diamond mine in Western Yakutia, and its output amounted up to 12.8 million tons of ore per year.

In H1 2015, ALROSA conducted the last blasting operations at the Udachny open-pit. Currently, the company is completing the transportation of stockpiled ore. In 2015, the Udachny open-pit mined the last 1.05 million tons of ore (about 1.7 million carats of rough diamonds).

From now on, the Udachnaya pipe will be fully switched to underground mining. The first stage of the Udachny underground mine was commissioned in June 2014. Once its design capacity of 4 million tons of ore per year is reached in 2019, Udachny will become ALROSA’s largest underground mine and one of the largest in the world. In 2015, Udachny underground mine will produce about 0.78 million carats of rough diamonds, and this volume will gradually increase to more than 5 million carats in 2019.

“The Udachny open-pit made a great contribution to ALROSA’s development, and its conservation represents a milestone in the history of the company. However, we feel confident about the future. The Udachny underground mine successfully ramps up capacity, and its indicative planning horizon is 50 years. The Zarnitsa open-pit mine will also gradually increase its output. From 2018, we are planning to bring into operation kimberlite pipes of the Verkhne-Munskoye field. The Udachny mining and processing division will remain one of the key production divisions of ALROSA and play a significant part in the implementation of the company’s long-term development programme which provides for the increase of diamond output to 41 million carats,” said Andrey Zharkov, President of ALROSA, at the official ceremony.

Latest news

ALROSA’s ESG credentials honoured with MOEX and Institutional Investor awards

ALROSA Group’s Q3 and 9M 2020 IFRS results

ALROSA reports its October 2020 diamond sales results

Where we operate

ALROSA Group operates across nine countries and ten regions of Russia.

Contacts

Our head offices, subsidiaries and affiliates.

Udachnaya pipe ALROSA is completing open-pit mining at the Udachnaya pipe, one of the oldest kimberlite pipes in Western Yakutia. On 25 July 2015, the official ceremony devoted to the