„–2-3-Input...project-Annex-1-to-TOR_e… · Web viewGeneral information about the site and specific construction conditions. The Yubileinaya deposit is located in circumpolar

Annex № 1 to the Terms of Reference

Input dataFor elaboration of work execution plan

for mining construction works for sinking, installation of support and installation of temporary communications of a conveyor incline in elevations of +664/-680 m and opening

crosscuts in elevation of -280 m of Yubileinaya pipe deposit.

№ List of data and requirements Content of data and requirements1 2 31. Site location. The Republic of Sakha (Yakutia), Aikhal urban type

settlement, production site of the Yubileiny open pit mine.2. General information about the

site and specific construction conditions.Planning restrictions, specific geological and hydrological conditions

General information about the site and specific construction conditions. The Yubileinaya deposit is located in circumpolar part of the Middle Siberian plateau, in the catchment area of the upper reach of the Markha river, in the Mirny district of the Republic of Sakha (Yakutia).The climate of the region is extremely continental; winter period is long and summer is short and moderately warm, sometimes hot. The amount of precipitation reaches 350-400 mm. Abs. highest attainable temperature (+35C) are in July while abs. minimum is in January (65C below zero). The average annual temperature is (11C below zero). Snow cover in the area lasts for 7 months from October to April, with its thickness in the watershed areas reaching 0.7 to 1 m while in natural depressions and under the ledges of trapp plateau up to 2 to 3 m. The frost-free period is 38 to 48 days.

The area of the Deposit is in the permafrost zone. The depth of seasonal soil defrost varies from 0.2 to 3 m. Zero isotherm is at thhe depth of about 700 m (–200 m abs.). The thickness of soil layer is 0.1 – 0.2 m. and it covers up to 2 m thick silt ice bearing sediments.

GEOLOGYGeological settings . The geological section in the area of construction site is represented by the following lithological varieties (from top to bottom):The Carboniferous system, Aikhalskaya suite (C2al1)

0.0÷4.2 filling, at the top of the interval (to 2.5 m) loam with limestone blocks up to 30 – 40 cm thick, followed by loam with dark gray dolerite debris (up to 5 cm).Permian-Triassic system (γβP2-T1)

4.2÷67.8 massive, fine-crystalline dark gray dolerite. In the interval of 4.2 – 9.7 m the rock is intensely jointed (1 - 2 joints per 1 lin m). The joints are often closed type, oriented at ∠10° - 30° to the axis of the core. On the walls of joints, limonitization is observed. Rock hardness ratio on Protodyakonov scale is 12.Silurian system Mashkovskaya Suite (S1mṡ)

67.8÷72.0 Interbedding of finely grained limestone with argillaceous limestones. The color of the rock varies from

№ ТД02-АЧ-1090-35-24/2 of January 10, 2019 15:17Signed: Andrey Nikolayevich Cherepnov

yellowish-gray to greenish-gray. Rocks are massive, thin-layered, argillaceous limestones, very fragile. The jointing is medium, subhorizontal.Silurian system Bashennaya suite (S1bṡ) 72.0÷127.0 interbedding of finely grained yellowish - gray, brownish - yellow, massive limestones, with gray with a greenish tinge pelitic argillaceous limestones, thinly layered, with interlayers of marls. The stratification is thin, irregular, subhorizontal. Medium jointing (2 – 3 joints per 1 lin. m).Silurian system Baitakh suite (S1bt)

127.0÷155.0 At the beginning of the interval 18.0 m thick interbedding of marls and limestone, followed by cryptomerous, brownish - gray, hogbacked bedded argillaceous limestone. At the end of the interval is the layer of green-coloured cryptomerous lamellar marls (3.7 m thick). Rocks are slightly jointed (1 to 3 joints per lin. m), the jointing is subvertical. Rock hardness ratio on Protodyakonov scale is 5-6.Ordovician system kylakh suite (O2-3kl)

155.0÷187.5 Marls with interbedding of argillaceous limestone at the ratio 2 : 1. Indistinctly laminated variegated, rather fragile marls, variegated, fragile. Horizontal stratification. Gray - brown, cryptomerous, sometimes massive limestone. Common type of joint is closed, smooth, straight, stratification is subvertical, rarely sub-horizontal.Ordovician system Sytykanskaya suite (O2st)

187.5÷207.2 Arenaceous greenish gray, gray with a greenish tinge limestone with thin layers (up to 10 mm) of green massive, cryptomerous marls. Limestones are pelitic and finely-grained, interbedded. Stratification is hogbacked, subhorizontal. The rock is medium-jointed, the orientation of joints is sub-horizontal, with open joints, single caverns and voids of rounded, rarely angular shape with a size of 2 to 5 mm are observed.Ordovician system Sokhsolokhskaya suite (O1sh)

207.2÷231.8 At the beginning of the interval, a layer of 5.0 m green-colored, cryptomerous marls with subhorizontal stratification. Individual 5 - 10 cm thick layers of arenaceous grey-coloured limestone are observed. To the end of the interval dark - gray, very fine-grained, massive with poorly expressed thin subhorizontal stratification arenaceous limestone. Throughout the interval, the rocks are moderately jointed. Open type subhorizontal joints.

231.8÷243.8 Dark gray with a greenish tinge, fine-grained, dense, massive dolomites with poorly expressed fine subhorizontal stratification (thickness of layers 2 to 5 mm). Rock is moderately jointed. Joints of open type, subhorizontal.

243.8÷256.9 Dolomitic gray brownish massive, dense finely-grained limestone, uneven intermittent thin lamination with a thickness of 5 to 10 mm. Rock is moderately jointed, open type subhorizontal jointing. Individual caverns and voids of angular and irregular shape with dimensions up to 3 mm. A uniform distribution of dark - brown grains of glauconite sized


1 to 3 mm is observed.256.9÷271.0 Argillaceous, greenish - gray, cryptomerous

limestone, with sporadic up to 30 cm thick interbedding of green-coloured marls. Limestone is lamellar, horizontal inclined layering ∠85° - 90°, thickness of layers 5 to 25cm. Medium subhorizontal jointing.

Rock hardness ratio on Protodyakonov scale is 5-6.Ordovician system Oldoninskaya suite (O1ol)

271.0÷550.0 Dolomite grey with a greenish hue with dolomite grey with a brownish hue. Rocks are pelitic and finely-grained, stratified. Stratification is mainly subhorizontal, hogbacked, poorly defined. Jointing is medium, subhorizontal. Joints are of open type. Rock hardness on Protodyakonov scale is 4-6 (50%); 7 - 50%.Cambrian system, Markokinskaya suite (Є3mrk)

550.0÷731.0 Interbedded argillaceous and calcareous dolomites with dense dolomitized limestones and marls subcalcareous. Jointing of rocks is moderate. Rocks are cavernous. Caverns are filled with gypsum. Rock hardness on Protodyakonov scale — 8-10 (3%); 7 (20%); 4-6 (77%)Cambrian system Markhinskaya suite (Є3mrh)

731.0÷1200.0 Interbedded argillaceous, calcareous and limestone dolomites. Joints, suture stylolite seams across the layer. Rock hardness on Protodyakonov scale — 7 (30%); 4-6 (70%).

The location of the excavation site should be considered in the design process, since the upper part of the section may change due to uneven thickness of Permian-Triassic (γβP2-T1) sediments.Gas saturation. Total gas saturation of the rocks lies in the range from 0.004 m3/m3 to 3.77 m3/m3.The hydrocarbon content to a depth of 500-600 m is 0.00016-0.001 m3/m3.The gas saturation of the host rocks, unlike kimberlites, decreases with the depth from 0.41 to 0.21 m3/m3 on average.Total gas saturation of kimberlites is 0.54 m3/m3 on average, two times higher that of the host rocks, which is 0.25m3/m3.The total oil bitumen saturation of rocks of the deposit is low and does not exceed 0.1% of the rock volume.Hydrogeological conditions.The Upper Cambrian sub-permafrost aquifer system in the deposit area is developed pervasively. 6 exploration and 12 hydrogeological observation boreholes, spread evenly around the perimeter of the deposit, tapped it.For the entire explored depth (up to 1200 m), it is the only aquifer system influencing the water abundance of the deposit during underground mining. This aquifer system is confined to lamellar interbedded argillaceous and carbonate rocks of the lagoon facies of the upper Cambrian, explored in the depth range of 550-1334 m, the lithological characteristics of which determine the distribution of reservoir layers, both in plan and in the section, confined to the most porous and permeable


interbed of rocks.The reservoir beds are concentrated within two intervals of the upper Cambrian, located in the near-bottom part of the Morkokinskaya suite and the upper part of the Markhinskaya suite. There are two aquifers in the section, namely Morkokinsky and Markhinsky aquifers, represented in the interval of absolute elevation marks – 40.2 / - 116.8 m and - 202.4 / 302.7 m, respectively. The total effective thickness of reservoir beds of the aquifer system does not exceed 21.2 m, which is only 12% of the total thickness of the aquifer system.The rocks of the aquifer system are characterized by low reservoir properties, which decrease with depth due to compaction and an increase of clay content of rocks.In general, the system is characterized by low and uniform hydrodynamic parameters: the values of the transmissivity coefficient range from 0.015 to 0.60 m2/day, with a prevalence of values >0.1 m2/day, piezotransmissivity coefficients – n x 103 - n х 104 m2/day.The only zone where the parameter values are increased by order of magnitude is the zone of jointing, confined to the Northeastern ore - hosting fault; transmissivity coefficient here is 5.2 m2/day, piezotransmissivity coefficient is 1.5X105 m2/day. The pressure head of the groundwater of the aquifer reaches 208 - 312 m. The piezometric level is measured at absolute elevations from +242 to +269 m. The level surface is sloped from the southwest to the northeast.Aquifer of the Morkokinskaya suite is the wettest in the depth interval 658.0 – 732.4 (- 40.2 / - 116.8 m abs.). Its roof is a series of permafrost rocks with a thickness of 570 m on the Southern and Eastern flanks and 650-662 m on the Northern and Western flanks of the deposit.The total thickness of the aquifer varies slightly from 60 m (boreholes 411, 411-н) to 76.8 m (borehole 415-н). Within its borderline, 10 to 18 reservoir beds with a total effective thickness of 7.2 to 16.2 m (12-26% of the total thickness of the aquifer) are observed with individual reservoir beds of 0.4 to 2.0 m (average 1.0 m). The collectors are characterized by granular cavernous and fractured porosity. Averaged total porosity ratios do not exceed 17.2-27.6%, open porosity — 8.7-12.7%, effective permeability — 8 mD (table 2.2, 2.3). In assessing the water abundance, insignificant inflows of reservoir fluid were obtained, varying within 0.2-13.8 m3/day (0.002-0.16 l / sec). The measured reservoir pressure varies from 21.5 to 27.3 kg/cm2 of the roof of the aquifer to 32.0-38.7 kg/cm2 at the floor of the formation.At the lower part of the Morkokinskaya suite, the largest number of aquifers having a continuous distribution is observed. The aquifer of the Markhinskaya suite is within the depth interval of 825–925 m (-202.4 ^ -302.7 m abs.). It is separated from the overlying aquifer by 90 to 100 m thick dense clayey carbonate rocks, which form a regional aquiclude.In the section of the considered aquifer there 2 to 9 reservoir


beds are distinguished, the thickness of which varies from 0.4 to 2.4 m. The total effective thickness of these reservoirs varies from 1.8 m (borehole 411-м) to 7.8 m (borehole 413-н), which is 2-8% of the thickness of the aquifer.In general, the reservoirs of the Markhinskaya suite are confined mainly to three depth intervals: 830-835 m, 885-890 m and 918-925 m.The average value of the open porosity of the rocks of the Markhinskaya suite does not exceed 7.1 – 9.8% and of the effective permeability — 0.11–0.67 mD (milliDarcy), which is significantly lower than that of the rocks of the Morkokinskaya suite. The reservoir pressure in the aquifer of the Markhinskaya suite naturally increases with a depth from 39.6-51.0 to 103.7 kg / cm2.Water inflows are 0.3 – 9.9 m3/day. (average 1 – 2 m3/day), which is also lower than in the Morkokinsky aquifer.To assess the filtration properties of the host rocks experimental cluster and single pumping tests were carried out on the Eastern, Northern, Northwestern, Southwestern and southern flanks of the deposit. Test show that for the upper Cambrian aquifer complex static levels of sub-permafrost water are at depths from 350 to 375 m, the head changes from 79 to 318 m.The average transmissivity coefficients for this aquifer system range from 0.015 to 1.976 m2/day, piezotransmissivity coefficients — from 3*103 to 1x104 m2/day. It should be noted that the water content of the near-contact of host rocks with kimberlites is two times and higher as compared to boundary zone, and the water content of kimberlites is the lowest.Below 925 m for the entire thickness (1334 m) explored by hydrogeological boreholes, the section of the Markhinskaya suite is almost waterless, with the exception of boreholes 413, 413-н, 416 and 418, which contain one water-bearing reservoir bed each. The remaining interlayers that have potential water collecting properties, and selected according to GIS [2], do not contain free water and feature only minor gas inflows according to the tests with the КИИ-95 reservoir tester. Given the predominantly clay composition of the rocks, the above-mentioned over 400 m thick part of the series of the Markhinskaya suite is a thick aquaclude for both the Markhinskaya suite aquifer and the upper Cambrian aquifer complex as a whole.By chemical composition, the sub-permafrost groundwaters are chloride magnesium-calcium brines with mineralization increasing with a depth from 143.8-166.0 g/l to 347.9 g/l, and with a content of nitrogen-carbon dioxide up to 1 m3/m3; the pH of brines ranges from 6.5 to 7.1.Comparison of the averaged values of the reservoir properties of the Morkokinsky and Markha aquifers shows that all characteristics of the latter have much lower value — the porosity coefficient is 1.5-3 times lower, and the effective permeability is an order of magnitude lower. These data


indicate a significant decrease in the reservoir properties of Upper Cambrian sediments with depth, which is caused by compaction of rocks [2, 3], and an increase of clay content in the Markhinskaya suite as compared with the Morkokinskaya suite.The inflows are in the range of 0.3-9.9 m3/day (0.003-0.11 l/s), while the majority of the tested intervals are characterized by inflows up to 1-2 m3/day, which is also less than in the Morkokinsky aquifer. The values of reservoir pressures of the Markhinsky aquifer naturally increase with depth from 39.6-51.0 to 103.7 kgf/cm2.

Planning constraints. Substantiation of the selection of the location of the underground mine construction site was carried out by the method of sequential exclusion of the locations of the development excavations with the construction of production facilities that can pose increased risks (danger), both in the category of safety (the presence of surface water bodies, dewatering tunnels near the open pits, the boundary of hazardous mining works, the presence of engineering structures of increased responsibility), and in the category of engineering incapability due to the formation of technogenic deposits (overburden and tailing dumps) resulting from open mining operations. Considering the location of industrial (engineering structures), man-made (overburden dumps), natural (surface water bodies) objects, as well as open pit footprint and boundary of the hazardous mining zone, the location of the existing industrial site is selected for the underground mine opening development.

3. Initial planning and building permits.

To be provided by the Customer, in accordance with the requirements of clause 10b of the RF Government Decree No. 87 of February 16, 2008, incl.:- land title document;- urban development plan for the land plot on a scale of 1: 500, registered in the Administration of the subject of the Russian Federation;- technical conditions for connection to the on-site engineering and utility networks as well as supporting surveying networks is to be provided by the Customer.

4. Initial technical solutions for the development of Project Execution Plan

1. This option of the deposit development presumes for the construction starting from the industrial site of the Processing plant No. 14 (elevation +664 m) of 7765 m. long, 7 m in diameter conveyor incline (100) to the level -680 m L., and two opening crosscuts in elevation -280 m with total length of 3360 m. Choice of ground support of the incline and crosscuts is to be substantiated by the contractor based on geological settings.2. Engineering survey data are provided by the Customer upon request.3. During development of Project Execution Plan a suspension of the raising of ventilation raise bore shaft at the level +664/-280 m by the Customer is to be provided for.


4. The Customer carries out handling of rock mass excavated during the raising of the ventilation shaft, which is to be provided for in Project Execution Plan.

5. Requirements for the content of Project Execution Plan include (but not limited to)

1. Section for the preparatory period of construction, including:a) schedule of work and types of work on site;b) construction plan indicating the locations of temporary (necessary for the period of drifting of the opening workings), including mobile buildings, structures and equipment, on-site networks with connection to supply and consumption places, temporary and permanent objects erected during the preparatory period for construction;c) equipment flow charts;d) the required schedule for commissioning by the Customer of temporary and permanent buildings and structures on the day surface, as well as for organizing the work of life support systems and setting up equipment;e) explanatory note with justification of construction of temporary buildings and constructions on a day surface, the list of a complex of works for preparation for the beginning of construction;(e) safety solutions.2. Section defining the procedure and schedule for delivery of the Contractor’s equipment to the construction site, including:a) the logistics supply chain of equipment to the site, taking into account the permissible transport weight and dimensions of individual units;b) procedure, schedule of assembly and setting up the equipment for operation on construction site;c) elaboration of local estimates for the relocation of equipment providing current prices.3. Section on substantiation and calculation of construction technology, including:a) justification of the selection of the method of excavation;b) justification of the choice of equipment;c) the parameters and method of performing drilling operations for pre-drilling;d) schemes and parameters of ventilation of developments at performance of works of 2,3,4 stages, the choice of the equipment for airing;e) schemes and parameters of water discharge at performance of works of 2,3,4 stages, the choice of the equipment for water discharge;f) substantiation, parameters, calculation of ground support of mine workings;g) statement of need and calculation of the consumption of energy resources (electricity, compressed air);h) substantiation and calculation of water supply for underground roadways for the period of drifting;i) the method and parameters of handling of the rock mass excavated during drifting of mine workings, the selection of equipment for the haulage of rock mass to the place of storage on the surface;


j) communication and signaling for the period of construction;k) organizing of construction (including staffing of the site with qualified personnel, the need to involve subcontractors, logistics, supply of materials and spare parts;l) fire safety measures;m) industrial safety measures;n) project estimate calculation for 2,3,4 stages of construction in current prices;o) the Contractor shall provide the customer with data on the rated capacity of the main and auxiliary equipment for the calculation of loads of electrical networks, the maximum air volume for the calculation of the parameters of the temporary main fan chamber and heater unit, the required volume of process water for the operation of equipment, the capacity of the temporary rock stockpile to maintain the planned sinking (raising, drifting) cycle, the initial requirements for the design of signaling and communication systems.

6. Requirements for development of cost estimate documentation

Cost estimate documentation to be developed by basic indexmethod based on current regulatory framework, particularly Costing Standard Database of 2001 (FSNB-2001) according to the estimating standards included in the Federal register of budget standards for the purpose of further execution of the Order of the Government of the Russian Federation No. 427 of 18.05.2009 (as amended) and Federal law No. 369-FZ of 03.07.2016.The estimated regulatory framework and cost estimating methods to comply with the requirements of the FAA Glavgosexpertiza of Russia (State Expert Authority) and MDS 81-35.2004. The content of the estimate documentation is to comply with part II of section 11 “Estimates for the construction of capital construction objects” of the Resolution of the Government of the Russian Federation of February 16, 2008 No. 87 (as amended).

7. Contents of delivery One hard copy on paper and one soft copy in electronic form of the Project Execution Plan are to be provided to the Customer. Documentation is to be executed using the following software: the graphic part — AutoCAD 2015, the descriptive text part — Microsoft Word 2013, the table part — Microsoft Excel 2013. All documentation should be in Russian.

Appendices:1. Layout schematics of the enterprise location — 1 sheet2. Opening and development of the central ore pillar of the Yubileynaya pipe deposit — 1 sheet.






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„–2-3-Input...project-Annex-1-to-TOR_e… · Web viewGeneral information about the site and specific construction conditions. The Yubileinaya deposit is located in circumpolar