Index of the document
РИ-ИСУ-06.02.01.00.00/3-1
Asarel-Medet JSC, town of Panagyurishte
Registration Number93-00 –7700/ 18.11.2009
APPROVED BY:
EXECUTIVE DIRECTOR:
/Dr. eng. L.Tsotsorkov/
REQUEST FOR QUOTATION
REGARDING: „Preparation of a working plan for development of the Assarel mine and
the West Section along outline “Stage 1” for overall mining of the remaining cost-effective
reserves with alternatives to proceeding to a larger outline (Stage 2) or a smaller outline (Stage
6)”.
1. CURRENT STATE
The Assarel copper ore deposit is located in the Sashtinska Sredna Gora Mountain in the
Central part of Bulgaria, district of Pazardzhik to 20 km away south from the town of Zlatitza and
to 10 km away to northwest of the town of Panagyurishte. The region of the deposit is an average
mountainous and it altitude varies from 800 to 1,080 km.
The geographical boundaries of the deposit are as follows:
- to the north - the saddle to the north from the peaks Razslatitza and Koychov Kamak;
- to the east – the Assarelska River;
- to the south – the saddle between the peaks Razslatitza and Lisa Mogila;
- to the north – the Panova River.
The deposit was studied during the period from 1969 to 1977 and as a result a small open pit
was commissioned with an annual throughput of 1 mln. tonnes of copper ore. The ore was
processed at the Medet Concentrator Plant located at 12 km to the northeast from the Assarel
deposit.
The construction of an open pit and a concentrator plant with planned annual throughput of
15 mln of copper ore started in the early 1982. The first stage of the complex was commissioned in
1989 and its annual throughput was 7.5 mln tonnes ore.
A decision was made to limit the annual throughput to 10 mln. tonnes of ore as a result from
the new economic situation in 1991.
The planned production capacity of 10 mln. tonnes of ore was achieved in 1997 as the
current throughput is 13 mln. tonnes of ore.
1.1 Mineralization of the Assarel deposit
The Assarel structure is orientated to the north—west and it is built mainly of Paleozoic
granites, Upper Cretaceous effusive vulcanites (andesites, lavobreccia and tuffs), sub-vulcanic rocks
(diorite, quartz-diorite and quartz-sienodiorite porphyrites). The Assarel deposit ore body which
has a copper cut-off grade of 0.10% has an irregular column-like shape. The long axis of the
horizontal ellipse-like sections is orientated to the north-northwest and their short axis is orientated
to the east-northeast. The vertical scope of industrial mineralization has not been defined yet but
industrial mineralization down to level 510 has been reached which was a subject of previous
planning. However, mineralization has been found down to level 405 using a small number of drill
holes.
The ore body has a complex internal structure, which was predetermined by various tectonic
disturbances, litological and mineralogical varieties, the nature and special location of the rock type
bodies.
More than 33 ore minerals have been found in it. The copper and gold bearing minerals are
of industrial importance.
Two endogenetic (pre-ore and ore) and one supergenetic stages with a total number of 10
parageneses were distinguished in the ore-formation process (Bogdanov, 1975 , 1987 .), Kr.
Angelkov distinguished four spatially differentiated mineral associations in 1973 and 1988:
- quartz-alunite-pyrite association with a small quantity of chalcopyrite distributed only in
effusive rocks;
- quartz-feldspar-chalcopyrite association, localized within the deep levels of the deposit;
- quartz-sericite-chalcopyrite-bornite association, embedded in the sericite quarzites;
- caolinite-chalcozine association – in the argillites and sericite quarcites in the upper parts
of the deposit;
- copper-carbonate-oxide association corresponding with the oxidized zone.
The industrial mineralogical classification of the ores from the Asarel deposit is represented
by three mineral associations:
- chalcopyrite association (zone of primary-sulphide mineralization)
- chalcozine-bornite-covelline association (zone of secondary-sulphide mineralization)
- copper-oxide-carbonite (oxidation zone).
The chalcopyrite association (ores of I type) contains less than 50% of secondary sulphide
copper. Chalcopyrite is the main ore mineral, chalcosine, coveline and bornite are secondary
minerals. This association is distributed from level 930 down to level 510.
The chaclosine association (ores of II type) contains more than 50% of secondary sulphide
copper. The main ore minerals are chalcosine, coveline, bornite, copper sulphosalts, chalcopyrite.
The association is located in the upper part of the ore body from level 1085 down to level 945. A
column is formed in the central part of the ore body down to level 805.
The carbonate-oxide association corresponds with the oxidation zone. The main ore
minerals are chalcosine, coveline, malachite, azurite and rarely cuprite, native copper. It is
distributed in the south part of the ore body and it makes a smooth transition to the areas of
chalcosine and chalcopyrite associations.
The rocks are hydrothermally altered and they have been converted into metasomatites built
up exclusively of secondary minerals: quartz, sericite, montmorillonite, other clay minerals, chorite,
epidote, alunite, diaspore, ore minerals. Depending on the quantitative ratios between the rock
forming minerals, the metasomatites are distributed into three groups: propylites, argillites and
secondary quarzites. The last two varieties are alunite-diaspore and sericite.
The ore bodies which build up the Assarel deposit are represented by the following rock
varieties:
Propylites form a monolithic body in the east half of the deposit and in the peripheral northwest and south-north parts. Separate elongated bodies of irregular shape are preserved in the central
part of the deposit. They are mainly subvulcanic dykes and apophyses here.
Argillites occupy the west half of the deposit. They are located down to the studied depth
but they are more widely spread at the deposit higher levels. Argillites are supergenetic in the
oxidation zone.
Alunite-diaspore quarzites form eight layer-like and lens-like bodies in the west half of the
deposit as all of them are embedded in argillites. They are distributed mainly at the higher levels of
the deposit down to the depth of 250 m.
Sericite quarzites form eight lens-like bodies in the central part of the deposit. They differ
by size and they are arranged in an array of beads orientated to the southeast-northeast. Bodies 1
and 2 are developed on the earth surface. The rest of the bodies are located by the geological
exploration drill holes. Their vertical scope is longer than the studied one by the drill holes. The
sericite quarzites are the main ore-embedding rocks in the deposit. Having a cut-off grade of 0.10
% Сu they contain 31 % of the copper reserves in the deposit at an average grade of 0.55 % Сu.
Due to this reason the sericite quarzites are referred to as eight geological, morphologically
differentiated ore bodies, embedded in mineralized mine material with a lower copper grade.
1.2 Engineering and geological conditions
The Asarel deposit and the ore field which pertains to it are considered as a small grabensynclinale located between the anticlynoriun of the Central Sredna Gora Mountain and the
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Panagyurishte graben-synclinorium in the scope of the Panagyurishte depth fault with a submeridinional orientation. This predetermines the strong tectonic alteration of the rocks. Ground
zones are formed as their depth varies from several to several tens of meters.
The exploration works carried out in 1978 showed that the Asarel deposit is limited to the
northeast by the Mial fault with a northwest-southwest orientation (130º-150º) and by the Petich
upthrust with the same orientation to the southwest. The structure is significantly complicated by a
number of secondary faults parallel to the Mial fault and also by such which have a northeast
andsub-equatorial orientation. Such are the Panovski fault and the Razslatitza fault which together
with the Mial and Petrich faults for several structural blocks. Those blocks are cracked by submeridional faults like the Dabravski, Hadgimitov faults, etc.
The most clearly expressed faults in the area of the pit are the Mial, Razsaltitza,
Razlozhkovsi and Dabravski faults. All of them are observed through the entire kettle.
The Mial fault is open in the northeast part of the pit. In this part it is a beam of several
parallel faults as it subsides to the south at a gradient of 50º-60º. The fault plane itself slightly
shifts its orientation from 210/80 in the west parts through 215/70 and reaches 195/70. Strips
with orientation of 175/75 and 215/65 are located upon it. The very smooth planes reaching a
length of 30-40 meters and a height of 15 meters are typical for the fault. The macro- and
mesostructures allow this disturbance to be defined as a fault – fault-shift. The block located to the
north (the recumbent wing), in which Sivata gramada peak falls, is relatively elevated. The
granitodiorites in proximity to the fault and the contact with the Smilovenski granite (represented as
a separate strip) are cataclised and slated which makes them look like gneisses.
The Razslatitza fault has opened in the south and southwest part of the pit. The entire fault
zone is filled with black tectonic clay. Its thickness increases from the bottom to the top – from 2030 cm to 1,5-2 meters. It subsides to the north-northeast (20-30º) at an angle of 60º and it separates
granites and granitodiorites to the north from microdiorites to the south. A multitude of dykes with
microdiorite composition occurs parallel to the fault which follow its propagation direction.
Mesoscopic criteria allow it to be defined as an upthrust. It merges with the microdiorites in the
south-southeast part while in the southeast part it serves as a boundary between the Smilovenski
granite and the microdiorites.
The Panovski fault within the deposit is observed between the Razslatitza and Mial fault
which is also a fault beam which subsides to the south. It is orientated to 130º and its gradient varies
from 60º to almost vertical position (beneath the Dispatch Building). A contact is observed between
the granites from the Smilovenski plutonic body and the granitodiorides under the Panovski fault in
the east part of the deposit. A 10-meter thick zone, built up of parallel veins filled with quartz,
pyrite and chalcopyrite is located parallel to the fault surface. The availability of this zone confirms
its sinnore nature. The Macroscopic criteria allow it to be defined as an upthrust.
The Razlozhkovski fault is observed in the southwest part of the mine. So far it has been
developed only in its upper levels. Its orientation is to 150º, as it subdues to the east-northeast at an
average gradient of 60º. It is easy to follow it on the terrain because of its thick layer of tectonic
clay (reaching up to 4 m of thickness) and because of the sub-parallel strongly mineralized dyke
with microdiorite composition. No absolute criteria have been established for its nature of
movement.
In conclusion we can say that the structures with orientation between 130º-150º are
predominant for the entire pit which are typical for this part of the Sredna Gora Mountain.
Structures with orientation to 70º, 90º and 110º can be considered secondary ones.
Based on a conjunction of indications and taking into account the major considerations of
the engineering and geological systematization from 1977, the compression strength from the report
from 1995 and the information for the exact names and distribution of metasomatites the rocks were
differentiated into four major groups:
First group – very strong and strong rocks (not altered or slightly altered), with an average
compression strength of 84 МРа which includes mainly propylites and more rarely quarzites.
Indeed, these are the densest and strongest rocks.
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Second group – strong rocks (significantly alteres) with a compression strength of 60 МРа
including mostly propylites. Those are cracked rocks, the strength of which refers to separate strong
pieces and does not correcpond to the compression strong of the predominant rocks in situ.
Third group – rocks of average strength (strongly altered) with average compression
strength about 36 МРа, which includes the three types of metasomatites: propylties, quarzites,
argillites. Their low compression strength is due to a number of cracks which explain their behavior
in situ as intensively cracked.
Fourth group – weak (very strongly altered) rocks which includes mainly argillites and
weak quarzites as propylites make an exclusion. They are not water-resistant – if they get wet and
stay in the open air, they fall apart completely and this is due to the significant contents of clay in
them. The tectonic clays, found in the Razslatitza fault in the southwest part in the mine also belong
to this group.
1.3 Hydrogeology of the pit
The hydrogeological evaluation of the massive was initially based on data from the studies
from 1977 and two visual checks made in 1995.
A map was prepared based data of the studies prior to 1977 in which some hydrogeological
peculiarities of the site were reflected.
Regardless the fissure nature of underground water, a single filtration flow used to exist in
the massif. It can be characterized as radial, convergent and non-pressure. Two elongated zones
with increased pressure and orientation west-south are outlined on the backgrounds of this flow.
The first zone is located in the west part of the pit. The levels reach elevation 1030 here. The second
zone is located in the center of the pit about elevation 1000. Those zones can be attributed to the
availability of ascending circulation of underground waters in the massif (concealed discharge of
pressure fissure waters). As a whole the massif is anisotropic with high conductivity of some
tectonic disturbances at a predominantly low filtering capacity.
It is presumed that the water contents of the slopes in the southwest part of the pit can be
attributed to the first zone with increased pressure and those in the north part – to the second zone.
The visual checks carried out in 1995 and the rough hydrogeological calculations made for
the purposes of orientation give us a reason to suppose that the constructed drainage gallery at level
710 does not dewater the mine efficiently.
A comprehensive analysis of the information collected as of that moment about the
hydrofeological and engineering and geological peculiarities of the deposit was assigned to the
American company Vector Colorado, LLC. Hydrogeological models prior to the start and after
stopping its operation, forecast models of the underground waters according to several scenarios
(with and without using the drainage gallery) ways for observance of underground waters and their
testing, geotechnical analysis of the pit slopes were made.
The summarization of the gathered information enabled us to obtain a clearer idea about the
specific hydrogeological conditions in the region of the Assarel pit. The underground waters in the
pit region and the adjacent territories are non-pressure and at separate places in the massive they are
weakly pressurized up to pressurized. The levels are established at different depths of the terrain –
from several meters to 100 m in proximity to the cup of the open pit. The general orientation of the
underground flow is from north-northeast to south-southwest. Based on the above-said, taking into
consideration the conditional terminology four zones were distinguished with different
permeability: zone 1, zone2, zone3, zone 4. Each of the so determined low rank hydrogeological
units (zones) has a very complex spatial shape, predetermined by the geometry of the natural relief f
the terrain, the lateral boundaries between adjacent zones and of the pit cup (at different levels of it
operation).
The first zone (zone 1) is formed in the weathering zone of the rock massif (the so called
oxidation zone). It occupies the upper parts of the section and varies within the boundaries for
several tens of meters to 100-150 m. In these parts the rocks are weathered and crack to different
extents which is a prerequisite for the relatively high permeability of the media. The filtration factor
varies within wide ranges from 1х10-3 to 1х10-1 m/d but most often it is about 5х10-2 m/d. The other
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3 zones are established in different metasomatite rocks: zone 2 is built up of secondary quarzites,
zone 3 – of argillites and zone 4 – of propylites.
The different rock varieties are distinguished also by the fact that they are cracked to various
extents but in general they are weakly cracked which predetermines they relatively low filtration
characteristics. The filtration factor in the three zones varies within a relatively small scope– from
1х10-3 to 2х10-2 m/d as the low values are more representative for zone 3 and the high ones for zone
4.
Under natural conditions (before constructing the pit) the average pressure gradient was high
– about 0.075 which is typical for the mountainous regions. After staring the mining activities, the
structure of the underground flow was strongly disturbed as a result from the drainage of part of the
flow in the built drainage gallery or directly along the slopes in the lower parts of the pit. A largescale depression was formed in the central parts of the considered territory of the accumulated
underground waters in the rock massif.
The feeding of the underground waters within the modeled area is done from various
sources: natural underground flow along the northwest boundary, infiltration of the rainfalls and
draining waters along the slope, a river with constant run-off. Under natural conditions the major
drainage of the rock massif is made predominantly to the southwest. When mining activities are
carried out, the larger part of the underground flow is drained along the drainage gallery (the flow
is about 25 l/s).
1.4 Reserves of the deposit
The industrial evaluation of the deposit reserves was made in 1977, an evaluation based on
the conditions was made in 1973 at a cut-off grade of 0.15% Cu for a 15-meter section.
The reserves were calculated based on two natural types of ore – primary sulphide ore and
secondary sulphide ores.
In the approved by the State Reserves Committee “Report for the results from the geological
studies of the Assaarel copper deposit”, the reserves down to level 510 as of July 1, 1977 are
accepted as follows:
- category В + С
- 377.3 mln. tonnes of ore 0.38 % Сu
-category С2
- 41.2 mln. tonnes of ore 0.26 % Сu
In compliance with the extent to which the reserves were studied and proven the reserves
were additionally divided into the following groups: proven reserves, probable reserves and
preliminarily evaluated reserves.
Balance ores (flotation ores and leach ores) are included in the group of the proven reserves.
The overbalanced ores within the pit outline are included in the group of the evaluated in
details resources.
The ores outside the pit outline with balance grade refer to the group of the probable
reserves and those with overbalance grade – to the preliminarily evaluated reserves.
In addition, the ores from the pit were further recalculated and grouped based on the
requirements for “Conditions for calculating the reserves in the Assarel copper-porphyry deposit
when mined from an open pit” approved in 1993 by the Executive Director of Assarel-Medet. Dr.
eng. Lachezar Tsotsorkov. There are two natural types and seven technological sorts:
І type - primary sulphide ores (chalcopyrite) are the ores in which the relative grade of
primary sulphide copper exceeds the grade of the secondary sulphide ores.
ІІ type - secondary sulphide ores (chalcosine) are the ores in which the relative grade of
secondary sulphide copper exceeds the grade of the primary sulphide ores.
- sort 1 - primary sulphide ores with oxide copper to 5 relative %;
- sort 2 - primary sulphide ores with oxide copper from 5 to 10 relative%;
- sort 3 - secondary sulphide ores with oxide copper to 5 relative %;
- сорт 4 - secondary sulphide ores with oxide copper from 5 to 10 relative %;
- sort 5 - secondary sulphide ores with oxide copper from10 to 15 relative %;
- sort 6 - secondary sulphide ores with oxide copper from15 to 20 relative %;
- окисни руди with oxide copper to 20 relative %.
5
The leach ores are secondary sulphide (7th sort) with oxide copper excceding 20 relative %
and secondary sulphide (8th sort), limited between cut0off grade 0.10 % copper (the boundary with
the waste) and the cut-off grade for the respective sort.
1.5 Ways of mining the deposit
The mining activities on developing the Assarel deposit is divided into two stages:
А. Experimental mining works from 1976 to1981;
B. Mining works from 1982.
The experimental mining works were performed by the Medet Mining and Proecessing
Complex according to a plan prepared by Niproruda JSC, Sofia.
A total amount of 2.4 mln. tonnes of ores with average copper grade of 1.237 % were mined
containing 29,989 tonnes of copper. They were processed n the Medet concentrator plant mixed
with the ores from the Medet pit.
The regular mining activities started in 1982 and were performed accordint to a plan
prepared by Niproruda JSCa and Giprotzvet, Moscow. The plan was approved by the Council of
Ministers aith Oreder No. 44 from March 20, 1981 as the outline of the pit was narrowed and its
bottom was made higher with three benches from level 510 to level 555 fro the purposes of
achieving better financial results. Thus 61..5 mln tonnes of ores from category В + С1 with average
copper grade of 0.35% were excluded from the approved balance reserves at the amount of 377.3
mln. tonnes.
A specialized council of experts at the Ministry of Industry with report from October 10,
1997 decided to accept outline B with reserves of 272 mln. tonnes of ore and pit botton at level 555
as of January 1, 1996 under the conditions for mining of the Asarel deposit.
A recalculation of the reserves was made in 1998–99 using the method of polygons along
outline B anf the state of the mine as of January 1, 1998 by Geotechmine KI, Sofia. The new
geological plan was approved by the Ministry of Environment and Waters in 2000.
The recalculated balance reserves include flotation ores and leach ores.
The process ores are primary and secondary suplphide and contain less than 20% oxide
copper at a conditional cuy-off grade of 0.22 % copper and cut-off grades according the the
conditions from1993 stated above.
We should note that under the conditions of market economy the conditions are a variable
depending on the copper prices at the London Metal Exchange and the costs for ore mining and
processing.
The mining activities in the Asarel pit are carried out in the co called outline B for which
also the mining concession was granted. Currently, the pit is mined from level 1095 to level 720, as
the levels beneath 915 fall within the deep part of the mine.
The benches in the pit are 150meters high.
The technology of the mining activities in the pit is as follows:

Drilling activities – 2 DRILTEH D 75 KS drills with a bit diameter of 251 mm for
the main blasting and 2 Atlas Copco ROC L8 drills for auxiliary blasting activities are used;

Blasting activities – blasting substances and blast materials produced by Dyno
NitroMed JSC, built in the region of the village of Panagyurski Kolonii are used.

Digging and loading activities – three types of loading units are used:
–
2 LIEBHERR ER 994 BE hydraulic shovels;
–
2 O&K RН 120 C and 1 LIEBHERR R 994 B hysraulic shovels;
–
2 САТ 992 D and 994 D front-end loaders;

Ore transportation to the concentrator plant and the leach ore – 130-tonne BelAZ
75131 trucks and a Cyclic Flow Conveyor Technology with capacity 3000 tonnes per hour.
The main technological processes are carried out by the respective auxiliary machines and
the auxiliary units and shops like:
–
Maintenance crews and central maintenance shop;
–
A unit for construction and maintenance of the roads, working sites and preparation
of drill fields;
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–
Power supply;
–
Pit and slopes dewatering.
In 2010 the new Cyclic Flow Conveyor Technology for waste haulage to the West Dumpfield
with capacity of 5 000 per hour is to be commissioned and the efficiency of the mine is to be increased
with up to 15 mln tonnes of ore according to the modernization plan of the current concentrator plant.
At a meeting of the Board of Directors of Assarel-Medet JSC (Report No. 249/ 15.07.2009 ) a
decision was made, item 1.4 of which states: To proceed to a new Working Plan for carrying out
mining activities in the Asarel mine along outline “Stage 1” including preliminarily calculated reserves
with cut-off grades of 0.17 % Cu and 0.15 % Cu accoriding the the table:
Assarel Mine
State of the reserves as of Janyary 1, 2010 along outlines “Stage 1”, “Stage 2” and “Stage 6”
Outline
Етапен 2
Stage 1
Stage 6
0.11
0.15
0.17
0.15
0.17
Copper grade, % Cu
520.7
295.8
270.3
235.4
217.5
Process ore, mln. tonnes
including
argillites
177.0
109.5
97.9
78.6
71.0
Secondary quarzites
95.0
71.2
68.1
63.5
61.8
propylites
248.7
115.1
104.3
93.3
84.7
1
554
077
1
046
708
1
006
764
860
658
840
988
Metal copper
including
argillites
449 580
320 835
301 967
235 800
227 003
Secondary quarzites
405 650
331 080
326 648
306 705
305 969
propylites
698 847
394 793
378 149
318 153
308 016
Average copper grade in the pit, %
0.298
0.354
0.372
0.366
0.387
copper
1.9
9.4
13.6
6.5
10.1
Leach ore, mln. tonnes
Metal copper, mln. tonnes
2 071
11 844
18 518
8 255
13 890
Copper grade, %
0.109
0.126
0.136
0.127
0.138
754.3
364.8
386.1
242.3
256.6
Waste, mln. tonnes
1 276.9
670.0
670.0
484.2
484.2
Mined material, mln. tonnes
1.44
1.20
1.36
1.00
1.13
Stripping ratio
2.
OBJECTIVE OF THE TASK
The objective of the task is:
I.
To develop alternatives for the overall mining of the reserves of the Assarel deposit at
different cut-off grades and prices at the London Metal Exchange within the boundaries of the
outlines, suggested by the Client, i.e. “Stage 1”, “Stage 2” and “Stage 6”. A justified from economic
point of view initial variant shall be suggested which is to be reviewed and accepted by the client.
II.
“Working plan for the overall mining of the Assarel Deposit and the West Section
along outline “Stage 1” fro digging out the remaining cost-effective and subject to processing ores
with alternatives to proceeding to a larger outline (Stage 2) or a smaller outline (Stage 6)” shall be
prepared through scientifically justified, technologically and practically feasible and
environmentally friendly solutions taking into consideration the following limitations:
- boundaries of the surface – outline “Stage 1”, “Stage 2” and “Stage 6” (Attachment 1);
- remaining reserves at the Assrel deposit;
- annual capacity of the concentrator plant: 15-16 mln. tonnes.
3.
SCOPE OF THE TASK
The task shall include:
А) General part
- Analysis of all processes and activities along the entire technological flow, including
preliminary and actual study, short-term and long-term planning and reporting of the mined
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quantities, ore mixing of the flotation ores, monitoring the slopes for deformations, mapping ot the
deposit, performing the mining and auxiliary activities in the mine:
- Detailed weather and hydrogeological characteristics of the deposit region.
B) Geological part
- Analysis of the current geological model of the deposit and preparation of a current model
including the data from the newly made exploration drill holes and mapping of the deposit based on
metasomatites and tectonic disturbances;
- Analysis, evaluation and calculation of the ore reserves falling within the boundaries of
outlines “Stage1”, “Stage2” and Stage 6”.
- Preparation of new conditions for calculating the reserves and resources in the Assarel
deposit.
C) Hydrogeological and engineering and geological characteristics of the deposit
- Analysis of the current hydrogeological model of the deposit:
- Forecast measurements as a result from transferring to outline B-average to outlines
outlines “Stage1”, “Stage2” and Stage 6”.
- Analysis of the current hydrogeological and engineering and geological peculiarities of the
deposit as well, as physical and chemical properties of the rocks:
- Defining the region of the deposit depending on each stage of mining activities along
outlines “Stage1”, “Stage2” and Stage 6”;
- Analysis of the general slope angles in the various sections of the pit in compliance with
the local engineering and geological conditions and stages of mining activities.
D) Mining and technological part
- General organization of the processes and activities at the Assarel mine. Production
capacities, schedule of mining activities, calendar schedule of development and life of mine taking
into consideration the capacity of the concentrator plant and the cyclic flow conveyor technology
for waste haulage:
- Mining of the deposit and development system;
- Drilling and blasting activities (main and auxiliary);
- Loading activities;
- Calendar schedule for mining activities – options shall be suggested for development at
various copper prices at the London Metal Exchange and cut-off grades of 0. 15% Cu and 0.17%
Cu as well as ways for transition from one stage development to another;
- The critical threshold for cost-effective mining of the deposit along outlines “Stage 1”,
“Stage 2” and “Stage 6” as well as the minimal cut-off copper grades at the individual stages of
development shall be forecasted;
- Transportation of mined material – recommendations for increasing the utilization of the
transport activities. Options for the following shall be prepared and evaluated:
 Haulage of ore to the concentrator plant using combined transportation:
 Trucks – Cyclic Flow Conveyor Technology with capacity 3000 tonnes per
hour and mobile loading unit;
 Trucks – Cyclic Flow Conveyor Technology with capacity 3000 tonnes per
hour and mobile loading unit – inclined hoist or skip hoist;
 Trucks – inclined hoist or skip hoist.
 Haulage of waste to the west dumpfield
 Trucks – Cyclic Flow Conveyor Technology with capacity 5000 tonnes per
hour and stationary loading unit located outside the pit outline;
 Trucks – Cyclic Flow Conveyor Technology with capacity 5000 tonnes per
hour and stationary loading unit located outside the pit outline– inclined
hoist or skip hoist;
 Trucks – Cyclic Flow Conveyor Technology with capacity 5000 tonnes per
hour and mobile loading unit located within the pit outline and its regular
relocation;
 Trucks – Cyclic Flow Conveyor Technology with capacity 5000 tonnes per
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hour and mobile loading unit located within the pit outline and its regular
relocation;- Specification of the mining equipment and a calendar schedule
for its gradual replacement - inclined hoist or skip hoist;
- Mixing of flotation ores – performing cost-effective and profitable flotation ore mixing
taking into consideration the concentrator plant requirements. The necessity for building a ore
mixing shop shall be evaluated and a technology to work with it shall be suggested;
- Slope stability of the open pit at various options of its development; ways and metods for
its monitoring shall be suggested;
- Construction activities – building and maintaining the road infrastructure, water drainage
and mining-construction activities. Evaluation of the project for pit drainage and dewatering for the
three options (Stage 1, Stage 2 and Stage 6)
- Designing the relocaton of the pertaining auxiliary devices servicing the whole mine and
the concentrator plant – options;
E) Maintenance activities and power supply of the pit – Organization of the maintenance
activities and power supply of the open pit. Improvement of the availability of mining units.
F) Technical and economic parameters of the work plan – the task needs to include several
options for the Assarel pit mining and the most optimal option fro m economic point of view based
on the NPV shall be suggested. Constant grade of the ore fed to the concentrator plant shall be
ensured. Each option needs to contain information about the needed investment and annual
operation costs for performing the mining activities.
G) Labor safety when performing mining activities - designing an efficient ventilation
system for the pit and reducing deleterious emissions in the air and the adjacent regions for each
stage for the suggested development of mining activities. Ways and methods fro reducing
technological delays of the main mining equipment shall be suggested for the conditions of reduced
visibility (fogs, adverse weather conditions).
H) Environment and water protection and rehabilitation after mining activities – The
work plan has to contain initiatives (methods, means and compensatory initiatives) to reduce the
negative impact of the activity of the pit, dumpfields, tailings dam, industrial site, wastes and
auxiliary activities upon the environment – surface and underground waters, atmosphere air, natural
resources and biodiversity;
- The work plan has to contain a Plan for managing mining wastes in compliance with the
regulations in force – the Underground resources act and the Regulations for managing of mining
wastes;
- The working plan has to contain over all projects for operation, closing ands rehabilitation
of the terrains, damaged by the mining activities including selection of a method, technology and
machines;
- The working plan shall contain alternatives I terms of location, scope, production capacity,
technologies, financial and economic parameters including “zero alternative” as well.
- Alternatives for resolving the issue of the water supply area of the Panova river have to be
suggested in the work project.
- В работният проект следва да бъдат предложени алтернативи за решаване на въпроса
с вододайната зона на р. Панова.
I) The contractor may add tasks which he considers appropriate to be resolved together
with the project preparation
4.
REQUIREMENTS FOR COMPETABILITY TO PARTICULAR QUALITY
INDICES
The suggested project solutions shall ensure operational safety and cost effectiveness when
performing drilling and blasting activities, digging and loading activities, transportation, dumping
and rehabilitation activities in the Assarel Mine.
5.
QUALITY (QUOTATION) REQUIREMENTS TO THE SERVICE =
9
5.1.
Competition part

The quoting company shall make a mandatory visual check of the site, to get
acquainted with the available documentation and to assess well the scope of work. It shall also sign
a Declaration for visit and visual check, provided by the Client.

A suggestion for prices for the separate sections and the final price for the task
completion.

Quoted time for completion of the task in work days.

Readiness to start work;

Terms and ways of payment (advance payment, etc.)

Evidence for technical experience, qualification and abilities of the applicant.

The quotation shall be valid at least 90 days.

The applicant shall present references from five previous or present clients with
addresses, telephone numbers and contact persons for project with similar nature.

The quoting organization shall present an insurance policy according to Articles 171
and 172 of the Territorial Organization Act.
5.2.
Non-competition part

Registration under BULSTAT;

Exact address, contact persons, telephone, fax and e-mail.

Court registration of the Contractor.

Certificate of actual standing of the company.

Requirements for assistance by the Client and conditions for the task
implementation.

The prior experience with such type of work shall be an advantage foe the company.

The design company shall carry out a 60-minute presentation after the project
completion to the respective mine personnel for the key points when implementing the project and
the world trend in this area.
6.
WAYS AND CRITERIA FOR ACCEPTING THE PERFORMED WORK
The final reporting and acceptance of the prepared project shall be made with a report at a
technical and economic expert council meeting for the accomplished task approved by the
Executive Director of the client company.
7.
MISCELLANEOUS

The requirements for activities performed by hired partners on the territories
controlled by Assarel-Medet shall be observed in terms of occupational safety and health
conditions, environment protection, access control and security and ensuring the availability of
personnel. Those requirements shall be introduced to the contractor when signing the contract.

The materials shall be presented in four copies and on electronic media (CD);

The observance of the requirements of the Occupational Safety and Health,
Environment and Corporate Security departments as well as the control authorities is mandatory.

The quoting companies shall be granted access to the site and the selected contractor
will be able to visit the company within the official working time of the Company;

The quotation shall be presented by 4 pm on December 30, 2009 in a sealed
envelope addressed to the Executive Director of Asarel –Medet JSC, 4500 Panagyusrishte via one
of the following way:
o
To fax 0357 60 250 to the personal attention of the Executive Director of AssarelMedet JSC, Dr. eng. L. Tsotsorkov.
o
To e-mail: rshumanov@asarel.com to the personal attention of the Executive
Director of Assarel-Medet JSC, Dr. eng. L. Tsotsorkov.
o
By post in a sealed envelope with the following address:
4500 Panagyusrishte
10
Assarel-Medet JSC
Executive Director
Dr. eng. L. Tsotsorkov
With the following note: Quotation for task implementation: „Preparation of a working
plan for development of the Assarel mine and the West Section along outline “Stage 1” for
overall mining of the remaining cost-effective reserves with alternatives to proceeding to a larger
outline (Stage 2) or a smaller outline (Stage 6)”.
The quotations shall be reviewed by the appointed for the purpose committee.
The results shall be announced after the committee finishes its work as the selection of the
submitted quotations shall be performed at one round. At the second round there will be discussions
for improving and further clarifying the parameters only with the companies ranked at the first three
places after the selection.
We note that the established order for storing the quotations in the company, transparency
and adhering to principles during their reviewal excludes the possibility for any influence
upon the contractor selection or upon the ingoing control quality through corruption.
Moreover, if such attempts are found out, the respective employees shall be disciplinary
dismissed from work and the contracts with the respective partners shall be cancelled.
Contacts: Assarel-Meder JSC, telephone: (0357) 60 210/ extension: 138 – Dr. eng. Krasimir
Karparov, eng. Em. Valcheva, eng. Iv. Yordanov.
November 19, 2009
PREPARED BY,
Head of Department Technical Activities
/. eng. Krasimir Karparov /
COORDIJNGTED WITH,
DIRECTOR OPERATIONS
/eng. D. Nikolov/
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