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Udachnaya pipe

The Udachnaya pipe (: Удачная, meaning "") is a prominent deposit and situated in the Daldyn-Alakit kimberlite field within the (Yakutia), , approximately 4 km east of the town of Udachny in the Mirninsky . Discovered on June 15, 1955, it consists of two intersecting pipes intruded into Lower , hosting -bearing eclogite, , and xenoliths in a reducing environment that facilitated the formation of unique microdiamonds with nitrogen, hydrogen impurities, and chromium-bearing minerals such as eskolaite. Owned and operated by the Russian diamond company , the Udachnaya mine began open-pit production in 1971 and rapidly became one of Alrosa's flagship operations, peaking in the early 1990s when it accounted for over half of the company's output, exceeding 12 million carats annually. By 2013, proven and probable reserves stood at approximately 120 million carats, with JORC-compliant resources totaling around 220 million carats, supporting average annual production of about 4–5 million carats in recent years. The open-pit operation reached depths exceeding 630 meters, making it one of the world's deepest such mines, but transitioned to underground mining in 2015 using uphole longhole retreat methods, with the underground facility achieving full capacity of 4 million tonnes per annum by 2021. In a major development approved in September 2025, committed 20 billion rubles (approximately $240 million) to the Deep-Horizon project, extending the mine's life to at least 2055 by accessing horizons down to 1,130 meters (-780 meters elevation), with projected annual ore processing of 4.1 million tonnes and profits nearing 6 billion rubles per year from 2025 onward. This initiative underscores Udachnaya's ongoing role as a cornerstone of global supply, contributing about 14% of 's total output of 32.4 million carats in and supporting the company's 33 million carats in , while highlighting the site's geological richness in 119 validated minerals, including sulfides like and within eclogites.

Overview

Location

The Udachnaya pipe is located at coordinates 66°26′03″N 112°19′03″E in the Mirninsky District of the (Yakutia) Republic, , approximately 550 km north of the city of Mirny. This positioning places it within the central region of the , a vast shield known for its stable geological foundation. The pipe lies in the Daldyn-Alakit field, a cluster of diamond-bearing volcanic structures in western Yakutia. It is situated about 15 km south of the , near the town of Udachny, which was established in to support mining activities and serves as the primary access point. The town connects to Mirny via the Udachny-Lensk highway, facilitating road transport for personnel and supplies over roughly 500 km of challenging terrain. The region's harsh climate, characterized by and extreme temperatures reaching -50°C in winter, poses significant operational hurdles. to the remote site rely on air transport from via Mirny Airport, operated by ALROSA's dedicated air company, supplemented by trucking services for ground delivery. On-site infrastructure includes processing , such as Ore Processing Plant No. 12, which handles directly at the mine to streamline operations amid these isolation factors.

Significance

The Udachnaya pipe, whose name translates to "lucky" in , embodies the serendipitous nature of its 1955 discovery and the profound economic windfall it has delivered to the and broader . This designation reflects not only the fortuitous circumstances of its unearthing during regional but also its role as a transformative resource that has bolstered local development and national wealth through sustained extraction. Owned and operated by , Russia's dominant diamond mining company with majority state ownership exceeding 65% through federal and regional entities, the Udachnaya pipe has been a pivotal asset in the firm's portfolio. At its production peak in the early , it supplied over 50% of ALROSA's rough diamonds, underscoring its historical centrality to the company's output and operational strategy. As one of the world's richest kimberlite pipes by diamond grades and reserves, Udachnaya exemplifies the high-quality that underpins Russia's position as the largest global producer by volume, contributing around 30% of worldwide supply. Its grades, reaching up to 2-3 carats per , highlight the deposit's exceptional productivity and its outsized influence on the . Prior to transitioning to underground in 2015, the open-pit operation attained a depth of 640 meters, making it one of the deeper open-pit mines in the . In September 2025, approved the Deep-Horizon project, investing 20 billion rubles (approximately $200 million) to extend the mine's life to at least 2055 by accessing horizons down to 1,130 meters.

Geology

Formation

The Udachnaya pipe formed as a diatreme during the Late period, with an emplacement age of approximately 367 ± 5 million years ago, resulting from the explosive ascent of volatile-rich derived from the deep mantle. This event involved the rapid intrusion of ultramafic, carbonatitic melts that breached the , creating a vertical pipe structure characteristic of kimberlite . As part of the broader Late Devonian magmatism across the Siberian , the formation of the Udachnaya pipe was influenced by tectonic rifting and interaction with a , which destabilized the cratonic and facilitated generation and ascent. This regional event produced multiple clusters, with the Udachnaya pipe exemplifying the explosive nature of these eruptions driven by of CO₂ and H₂O in the ascending melts. The pipe developed as a twin , comprising the adjacent Udachnaya-East and Udachnaya-West bodies, which formed contemporaneously through a series of phreatomagmatic and magmatic explosive phases that excavated and filled the diatreme. Udachnaya-East represents the more voluminous and diamond-prospective lobe, while Udachnaya-West is comparatively smaller and less enriched in diamonds, reflecting variations in eruption dynamics and during the shared intrusive event. The eruption occurred within a of the Siberian platform, penetrating Paleozoic sedimentary rocks such as limestones, dolomites, and sandstones, which were incorporated as country-rock xenoliths and fragments during the magma's violent ascent. This process entrained syngenetic minerals from and crustal levels, preserving a record of the contemporaneous geological in the pipe's infill.

Structure and Composition

The Udachnaya pipe exhibits a classic diatreme typical of kimberlite intrusions, consisting of two distinct lobes—the eastern and western bodies—that merge at approximately 250–270 m depth to form a single, near-surface body. At the surface, this upper structure displays an elliptical outline measuring roughly 895 m by 370–560 m, transitioning downward into separate, cone-shaped diatremes filled predominantly with brecciated material. The diatremes narrow progressively with depth, reaching dimensions of about 200–300 m at 500–600 m below the surface, while the underlying root zone, characterized by coherent hypabyssal , extends beyond 1 km in depth, separated by faulted sedimentary host rocks. This reflects multiple intrusive and explosive phases, with the zones incorporating autoliths and country-rock fragments. The pipe's rock types primarily comprise breccias in both volcanic (tuffisitic and fragmental) and hypabyssal () facies, dominated by macrocrysts (up to 1 cm in size, 20–30 vol.%) embedded in a fine-grained groundmass. Unlike typical kimberlites, the groundmass of the Udachnaya-East pipe is unusually enriched in volatile components, featuring up to 30 vol.% alkali carbonates (such as , zemkorite, and shortite), 10 vol.% halides ( and ), and minor sulfates (e.g., aphthitalite and Na-Ca varieties), reflecting primary magmatic saturation with - and carbonate-bearing brines rather than hydrous fluids. These assemblages contribute to elevated bulk concentrations of CO₂ (up to 14 wt.%), (up to 6 wt.%), and S (up to 0.6 wt.%), distinguishing the pipe's composition from serpentine-dominated kimberlites elsewhere. Mantle-derived xenoliths are abundant within the breccias, providing key insights into the Siberian craton's lithospheric structure, with common types including eclogite (1–5% of total xenoliths, often fresh and large, 1–20 kg), garnet lherzolite, , and rare dunite fragments sourced from depths of 40–200 km. These xenoliths, primarily of peridotitic and eclogitic parageneses, record a depleted, Archean-aged cratonic with variable metasomatic overprints. Hydrothermal alterations in the pipe are evident through the presence of saline brines (Cl–Ca and Cl–Ca–Na types, with up to 391 g/dm³) and oil occurrences in aquifers intersecting the structure, marking post-emplacement fluid interactions that differentiate Udachnaya from standard systems. These fluids, of sedimentary-metamorphic origin with ancient affinities, have facilitated secondary mineralization and impregnation in zones.

Mineral Resources

The Udachnaya pipe is renowned for its high diamond grades, averaging approximately 1.2 to 1.5 carats per tonne of (as of 2025), with particularly elevated concentrations in certain zones that contribute to its economic viability. The diamonds are predominantly gem-quality, including rare Type IIa varieties characterized by low content, which enhances their clarity and value. These diamonds typically form octahedral crystals, often exhibiting macle twins and distinctive etch pits, with individual stones reaching sizes exceeding 100 carats. The pipe also hosts unique microdiamonds with and impurities, and even elemental inclusions, preserved in a reducing . JORC-compliant diamond reserves are estimated at approximately 128 million carats, with total resources of about 208 million carats (as of 2025), based on comprehensive assessments of the pipe's orebody. Associated with the diamonds are mantle-derived indicator minerals such as garnets, picroilmenite, and , which serve as key exploration markers and provide insights into the pipe's deep-seated origins. Minor sulfides and native metals, also sourced from , occur alongside these, reflecting the kimberlite's interaction with peridotitic and eclogitic assemblages. Diamond distribution exhibits zonation, with higher grades concentrated in the central of the East , gradually decreasing toward the , a pattern influenced by the pipe's chloride-rich composition that aids in diamond preservation by minimizing oxidative alteration. This underscores the East 's dominance in resource quality compared to the shallower West .

History

Discovery

The Udachnaya pipe was discovered on June 15, 1955, by Soviet geologist Vladimir Shchukin and his exploration team during regional surveys in the Daldyn-Alakit area of Yakutia. This find occurred just two days after the nearby Mir pipe, marking a rapid succession of major discoveries that transformed Soviet diamond prospecting. The exploration was part of intensified post-World War II efforts by the Soviet government to identify domestic resources in the remote Siberian region, driven by strategic priorities to reduce reliance on imports. Teams employed indicator mineral sampling from river gravels and black sands, focusing on garnets and as signatures of sources, a method refined from earlier work on the Siberian Craton. Initial assessment confirmed the site as a pipe through holes and sampling, which yielded —including a 4 mm in the first holes—and indicated high grades of approximately 3 carats per cubic meter. The pipe was named "Udachnaya," meaning "lucky" in , reflecting the fortuitous of the amid the vast and rugged terrain, where Shchukin's team covered over 1,000 kilometers of routes in a single season. This rapid identification contrasted with more laborious efforts at prior sites like Zarnitsa, underscoring the pipe's immediate promise as a significant deposit. The remote Arctic location of the Udachnaya pipe, situated outside the in northeastern , presented substantial early challenges, including harsh weather, logistical constraints, and limited that hindered timely access and operations. These factors delayed full evaluation until subsequent geophysical surveys and campaigns from 1956 to 1958, which involved detailed mapping, sampling, and feasibility studies to delineate the pipe's extent and potential.

Development Phases

Following the discovery of the Udachnaya kimberlite pipe in 1955, the initiated substantial investments in the late 1950s and 1960s to develop the remote Yakutia region's capabilities, prioritizing to support large-scale extraction in the harsh environment. This included the construction of essential transport networks, such as roads linking the site to the nearby Mirny mining hub, and the establishment of worker settlements to accommodate the influx of labor from across the USSR. These efforts were part of a broader state-driven industrialization push to transform Yakutia into a key -producing area, with initial focus on preparatory site works and logistical support for eventual open-pit operations. Construction of the open-pit mine commenced in the mid-1960s, with the Udachny Mine officially founded in 1967, marking the start of engineering and excavation activities. Early test mining during this period yielded the first rough diamonds, which were processed at the newly operational Processing Plant No. 11 in the same year, confirming the deposit's viability and allowing for initial output assessments. By , the town of Udachny had been established as a dedicated for over 10,000 workers and their families, providing , utilities, and community facilities to sustain the growing workforce in the isolated zone. Full-scale open-pit development accelerated into the early , with activities formally beginning in 1971 through techniques adapted to the frozen terrain. The installation of crushing and sorting facilities culminated in the commissioning of the first stage of the and complex in 1976, including Processing Plant No. 12 with a of 11 million tonnes per year and seven large grinders for handling. This enabled the transition from exploratory to commercial production, solidifying Udachnaya as a cornerstone of Soviet output. Technological adaptations were critical due to the region's deep , which posed stability risks to both and the walls. Engineering solutions included constructing buildings and facilities on piles to prevent from ground thawing, while operations employed specialized methods such as heated equipment and de-icing procedures to manage frozen rock and maintain integrity during excavation. These innovations, developed through Soviet geological , addressed the challenges of working in temperatures often below -50°C, ensuring safe and efficient development.

Operational Milestones

The open-pit operations at the Udachnaya pipe reached their zenith during the and , marked by significant expansion that elevated the mine to a cornerstone of diamond production. Mining activities, which commenced in 1971, intensified through the development of extensive and trucking , culminating in an annual output peak of approximately 12 million carats in the early —a figure that accounted for more than half of ALROSA's total production at the time. By the turn of the millennium, the pit had deepened to around 600 meters, reflecting sustained investment in equipment and processing capabilities that solidified Udachnaya's role as one of the world's premier deposits. The dissolution of the Soviet Union in 1991 ushered in a period of profound economic upheaval for the Russian diamond sector, yet Udachnaya's operations demonstrated resilience amid privatization efforts. In 1992, the state-owned Yakutalmaz enterprise was restructured into Almazy Rossii-Sakha (ALROSA) through a presidential decree, transitioning the enterprise toward partial private ownership while preserving centralized control over key assets like Udachnaya. Despite a broader decline in rough diamond exports—dropping to about 20% of 1989 levels by 1995 due to funding shortages and hyperinflation—ALROSA maintained substantial production at Udachnaya, leveraging existing infrastructure to weather the crisis and sustain contributions to national exports exceeding $2 billion annually by the late 1980s. A pivotal depth milestone was achieved by 2010, when the open-pit reached 640 meters, positioning Udachnaya as the world's third-deepest such mine after Bingham Canyon and . Initially slated for surface mining closure in 2010 to shift resources toward more viable extraction methods, the timeline was extended to 2015, allowing additional recovery while preparations advanced. This progression underscored the economic imperatives driving operational evolution, as the diminishing viability of extracting deeper ores via open-pit methods—coupled with rising costs and logistical challenges—necessitated a transition to underground mining. Conceptual for the underground phase at Udachnaya was approved in , enabling access to reserves below meters and ensuring long-term sustainability for the deposit.

Mining Operations

Open-Pit Mining

Open-pit mining at the Udachnaya pipe commenced in 1971 and continued until 2015, forming the initial phase of diamond extraction at the site operated by . The extraction process relied on large-scale blasting using ammonium nitrate-fuel oil explosives to fracture the , followed by loading with hydraulic excavators and haulage via a fleet of over 40 CAT-785B dump trucks, each with a capacity exceeding 100 tonnes, to transport the material to the facility. This truck-and-shovel enabled efficient handling of the massive ore volumes in the harsh conditions of Yakutia. The pit was designed with stepped benches typically 15-20 meters high, adapted to the frozen ground that required specialized to maintain stability and prevent thawing-induced . was essential due to inflow, achieved through a system of sumps at the pit bottom and high-capacity pumps that continuously removed water to keep the working faces dry and operational. The open-pit ultimately reached a depth of 640 meters, marking one of the deepest operations globally. Ore from the pit was integrated into on-site processing, where it underwent primary crushing to reduce particle size to below 150 mm, followed by dense media separation to concentrate the diamonds. Safety protocols emphasized control through bench and netting, alongside dust suppression via ventilation systems and water sprays to mitigate respiratory hazards in the confined pit environment. Annual ore output peaked at approximately 13 million tonnes during the operation's height, underscoring the scale of the surface endeavor.

Underground Transition

The transition to underground mining at the Udachnaya pipe was planned as part of Alrosa's long-term development strategy in the early 2010s, following the exhaustion of economically viable open-pit resources. Pilot operations commenced in 2013, with initial ore extraction reaching 74 tons of salable material that year, representing 92.7% of the planned output. The underground mine, named after Fyodor Borisovich Andreev, was officially commissioned in June 2014 with an initial capacity of 1.475 million tons of ore per year, ramping up toward a full target of 4 million tons annually by 2019. Full handover from open-pit to underground operations occurred in July 2015, after the surface pit reached its maximum depth of 640 meters, marking the end of surface extraction and the onset of subsurface development to access deeper kimberlite reserves. Infrastructure development during the transition focused on creating robust access and support systems to sustain high-volume handling below the surface. Key elements included the construction of decline ramps, such as Ramp No. 3 driven from the -380 to -480 meter levels, alongside three vertical s positioned south of the former open pit for safe access below the -320 meter elevation: a for ore hoisting and exhaust air discharge, a cage for personnel and equipment transport, and an auxiliary equipped with a commissioned in 2013. systems were enhanced with dedicated units for dust control and aerogas monitoring, while passes and stockyard workings at the -480 meter level facilitated efficient . A main complex at the -580 meter level, including loading facilities, addressed needs, supporting the mine's designed annual capacity of 4 million tons. Investments in these builds totaled 6.62 billion rubles in 2013 alone, comprising 99.3% of the budgeted amount. The technological shift emphasized the adaptation of sublevel for the ore body, a method selected for its suitability to the pipe's vertical, pillar-like structure branching into western and eastern ore bodies. This involved double undercutting horizons at levels like -650 meters, with chevron-shaped designs spaced 35 meters for haulage drifts and 15 meters for loading ramps to promote controlled and minimize hang-ups in the fragmented . Preparatory workings at -320 and -365 meter levels incorporated drawpoints for continuous extraction, achieving estimated ore loss of 10.7% and dilution of 12.9%. Early implementations included pilot testing of automated elements, such as for monitoring, though full remote systems for and operations were integrated progressively post-transition to enhance and efficiency in the confined subsurface environment. Significant challenges during the transition included high rock stress at depths approaching 1,000 meters, which increased abutment pressures on roadways and stope pillars, alongside seismic risks from the unstable host rocks of limestones and . These were mitigated through geomechanical assessments and design adjustments, such as hydraulic radius calculations ensuring a minimum of 18 meters for undercut stability to prevent rock bursts. inflows from deep aquifers, particularly aggressive chloride-based waters at 30-40 cubic meters per day affecting ramps like No. 3 and horizons from 680 to 980 meters, posed hydrogeological threats that complicated excavation and integrity. Overcoming these involved comprehensive hydrogeological studies, measures in stations and inclined drifts down to -655 meters, and the of and reinjection systems to seal inflows and maintain operational .

Current Practices

As of 2025, the Udachnaya pipe operates as a hybrid diamond facility, combining underground extraction with the of remaining open-pit stockpiles. Underground employs the sublevel method, which facilitates efficient recovery in the body by allowing controlled collapse of the overlying rock. This approach is implemented at depths ranging from -320 m to approximately -650 m, with ongoing development targeting deeper levels under the recently approved Deep-Horizon project extending to 1,130 m. In September 2025, approved the Deep-Horizon project, investing 20 billion rubles to access deeper horizons up to 1,130 m, extending mine life to 2055 with projected annual of 4.1 million tonnes starting in 2025. Key technologies enhance operational efficiency and diamond recovery. Ore is transported using truck trains, including diesel-electric loaders adapted for underground conditions, supplemented by conveyor systems to minimize haulage times and emissions. Diamond separation relies on advanced transmission sorting, which detects low-luminescent diamonds with high accuracy, achieving recovery efficiencies exceeding 98% in primary enrichment stages. Automation elements, such as digital twins and systems, optimize mining layouts and equipment deployment. The workforce at the Udachny Mining and Processing Division, which includes Udachnaya operations, comprises over 3,900 personnel operating in rotating shifts to ensure continuous production in the remote environment. Safety protocols emphasize advanced geomechanics monitoring, particularly in zones of increased fracturing within the , using stress-strain modeling and real-time observations to prevent rock falls and gas emissions. Sustainability measures address the challenges of permafrost conditions, including energy-efficient ventilation systems that recover heat to maintain stable underground temperatures and reduce energy consumption. Water management incorporates recycling rates of up to 96% across operations, minimizing freshwater use and tailings discharge in the frozen terrain. These practices support Alrosa's broader goals of emission reductions and carbon neutrality by 2030.

Production and Economics

Historical Output

The Udachnaya pipe's diamond production began ramping up following the commencement of in 1971, with initial output in the early limited by infrastructure development. By the late , annual production reached approximately 4 million carats, increasing to 4-6 million carats annually through the end of the decade as processing facilities were commissioned. During the , production grew steadily due to expanded open-pit operations and improved extraction techniques, achieving around 10 million carats per year by the decade's close. This growth reflected broader Soviet-era investments in Yakutia's mines, where Udachnaya emerged as a key contributor to national output. The and marked the peak period for Udachnaya, with average annual production of 12-15 million carats, driven by high-grade ore from shallower depths and operational efficiencies under Alrosa's management. By 2010, cumulative production from the pipe exceeded 500 million carats, underscoring its status as one of the world's most prolific sources. Post-2010, production declined to around 4-6 million carats annually as approached depth limits around 600 meters, prompting a shift toward methods and selective of high-grade zones to maintain viability. This transition temporarily reduced volumes while preserving resource quality, stabilizing at approximately 4 million carats in recent years. Throughout the , the average price for from Udachnaya ranged from $100 to $150 per , bolstered by the pipe's yield of high-quality gemstones suitable for jewelry markets. These values were influenced by the proportion of large, colorless , which commanded premiums over industrial-grade .

Reserves and Capacity

The Udachnaya pipe maintains proven diamond reserves of approximately 200 million carats as of post-2020 audits conducted by , reflecting ongoing depletion and efforts. Measured resources extend beyond 300 million carats to a depth of 1,200 m, supporting long-term extraction potential in the structure. These estimates underscore the pipe's status as one of Russia's premier deposits, with reserves explored to depths of up to 1,635 m. The mine's processing infrastructure supports an annual ore capacity of 4.1 million tonnes, equivalent to a daily throughput of 15,000 tonnes at the Udachny mining and processing division plant. This setup yields approximately 4 million carats of diamonds per year, driven by efficient underground mining operations. In 2024, Udachnaya contributed about 4.6 million carats, or 14% of Alrosa's total output of 33 million carats. The average diamond grade stands at 1.8 carats per tonne in underground zones, increasing in deeper horizons from -800 m to -1,000 m, where richer concentrations enhance overall recovery rates. With the recent approval of deep-horizon development projects, the life-of-mine has been extended to 2055, assuming an annual depletion rate of about 4% based on current extraction volumes. This extension secures sustained output amid transitioning to fully methods, optimizing utilization without compromising or efficiency.

Economic Impact

The Udachnaya pipe serves as a major driver for , contributing approximately 14% of the company's total production in recent years, which translates to a significant portion of its amid challenging global market conditions. In 2023, ALROSA's reached RUB 322.57 billion (approximately $3.55 billion), highlighting the mine's role in sustaining the firm's despite sanctions and price volatility. The ongoing operations at Udachny are projected to generate nearly 6 billion rubles in annual profits from 2025 to 2055, further bolstering ALROSA's long-term earnings potential through a planned of 20 billion rubles. On a level, the Udachnaya pipe bolsters Russia's position as a leading exporter, with accounting for 95% of the country's output that represents about 32% of global supply by volume in 2024. The mine's contributions, equating to over 10% of Russia's total , indirectly fund in the (Yakutia), including roads and power grids, via 's substantial tax and royalty payments that comprise 35-45% of the region's budget revenues. Historically, the open-pit phase of Udachnaya alone yielded valued at around $80 billion, underscoring its enduring economic significance to the . Locally, the Udachnaya operations drive in of Udachny, serving as a city-forming enterprise that employs over 1,200 workers directly at the underground mine and supports broader through ALROSA's fiscal contributions. These activities enhance the local GDP by generating jobs and stimulating ancillary services in this remote region. The mine's output of high-quality gem diamonds influences the global market by providing a reliable supply of premium rough stones, which helps mitigate price fluctuations during periods of supply disruptions or demand shifts.

Future and Challenges

Expansion Projects

In September 2025, ALROSA's investment committee approved a deep-horizon development project for the Udachnaya pipe, allocating 20 billion rubles (approximately $200 million) to extend mining operations beyond the previously projected closure in 2039. This initiative targets deeper levels from an absolute elevation of -680 meters to -780 meters, enabling access to untapped kimberlite reserves at depths up to 1.13 kilometers below the surface (with the surface at +355 meters absolute elevation). The project is scheduled to commence in and continue until 2040, with active mining extending operations for at least 15 additional years until 2055. It involves sinking new shafts to support an annual ore extraction rate of 4.1 million tonnes of diamond-bearing , leveraging the mine's existing while integrating enhancements for deeper extraction. These efforts are projected to sustain the site's contribution to ALROSA's overall production, which historically accounts for about 14% of the company's diamonds. Technological upgrades form a core component, including refined block caving and sublevel techniques adapted for the pipe's and advanced systems such as AI-driven monitoring for truck loading and conveyor operations, alongside remote-controlled equipment for ore crushing. These innovations aim to improve safety and efficiency in the challenging deep-underground environment, building on proven methods already in use at the Udachnaya mine. Economically, the expansion is expected to generate an annual profit of approximately 6 billion rubles (about $72 million as of September 2025), while maintaining output at around 4.5 million carats per year through the extended period. This will help preserve the mine's role as a key asset, supporting ALROSA's reserves that currently exceed 600 million carats across its portfolio.

Environmental and Social Considerations

The Udachnaya pipe's mining operations, located in the permafrost-dominated region of Yakutia, , present significant environmental challenges, including disruption to the frozen ground that leads to risks. thaw from excavation and development can cause ground instability, potentially resulting in failures and surface around the . Additionally, the body contains mineralized brines and oil occurrences that infiltrate the workings, particularly at depths of 500–800 meters, necessitating ongoing to prevent of and surface waters. Waste rock dumps from open-pit and underground activities cover over 100 hectares, contributing to land disturbance and elevated ecological risks in surrounding areas. To address these issues, has implemented reclamation programs since the early 2000s, focusing on land restoration and . Efforts include technical reclamation of disturbed lands, with 1,165 hectares reclaimed company-wide in 2024, alongside of 698 hectares in Yakutia. At Udachnaya, specific measures involve water recycling systems that reduced clean water use and reinforced tailings dams in zones, with pilot projects for mineralized planned for 2025 to neutralize effluents. For reduction, ALROSA converted special service vehicles to at the Udachny site, avoiding 1,445 tons of CO2 emissions in 2024, as part of broader goals for operational carbon neutrality by 2030 through efficiency improvements and integration. Socially, the mine supports the town of Udachny, home to approximately 13,000 residents, by providing essential infrastructure including housing, schools, and healthcare facilities through ALROSA's investments totaling 8.1 billion in 2024 for regional development, education, and health services. Evenk and Yakut communities in the area benefit from employment opportunities, with comprising 12% of ALROSA's workforce and 40% of new hires being local Yakutia residents. However, mining activities have led to cultural disruptions, such as interference with traditional and practices, exacerbating challenges for these groups amid broader industrial expansion in the republic. ALROSA adheres to Russian federal environmental and safety standards, as outlined in its annual sustainability reports, with no major environmental incidents or penalties recorded since across its operations, including Udachnaya. The company maintains ISO 14001: certification for environmental management and conducts regular audits of facilities, ensuring compliance with the Kimberley Process and zero reported spills or non-compliance violations in 2024.

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