РИ-ИСУ08.02.00.00.00/5-1
ATTACHMENT 1
ASSAREL-MEDET JSC – town of PANAGYURISHTE
Technical Assignment for Long-term Tangible Assets Delivery
REGARDING: Delivery of acoustic camera with imbedded inclinometer for documenting drill holes.
1. Description of the operation conditions of the acoustic camera (AC).
The Assarel copper ore deposit is located in the Sashtinska Sredna Gora mountain, district of
Pazardzhk, Central Bulgaria to 10 km northwest from the town of Panagyurishte. The mine is located
at an altitude of 930 – 1080 m.
The deposit consists of Paleozoic granitoides, Upper-Cretaceous effusive vulcanites –
andesites, lavobreccia, tuffs and sub-vulcanic rocks (diorite, quartz-diorite, granitodiorite).
The rocks are hydrothermally altered to different extents into the following metasomatites:
- Sericite quarcites
- Alunite-diaspore quarcites
- Argillites
- Propylites.
The mining activities are carried out on 15-meter-high benches when blasting. Blast holes are
drilled with three-roller bits – Ф 251 mm and their length reaches down to 17 m. Blast holes for contour
blasting with diameter ф 165 mm are also made.
Exploration core drilling is carried out with drill hole diameters NQ 75,7 mm and HQ 96,1 mm,
drill hole length down to 580 m. The drill holes are encompassed with casing column. The drill hole
walls are strengthened with bentonite and they may also be filled with turbid water.
2. Purpose:
The acoustic camera with embedded inclinometer is needed to document and collect
geological information from the various drill holes in the pit.
The camera has to provide an orientated unfolded ultrasonic image with high resolution from
the drill hole walls.
The camera has to be suitable for monitoring the drill holes whose walls are strengthened with
bentonite or filled with turbid waters, monitoring cased drill holes and drill holes made with three-roller bits
and water ablution.
2.1 The usage areas of the camera have to include the following:
- Finding cracks and faults and defining their spatial orientation.
- Creating stereograms which show the cracks and faults orientation and their grouping into
separate structural systems.
- Finding thin zones (caverns) and defining their depth.
- Differentiating various lithological types according to their acoustic features.
- Correlating the data from a drill hole group.
- Defining the drill hole spatial orientation during the drilling.
Identification of structural dislocations in the massif before the mining activities reach them is
aimed with the obtained information. This information will improve the efficiency of mine planning and
mining works development, on one hand, and will result into increasing the accuracy of the slope
stability factor during long-term planning, on the other hand.






2.2 Operation conditions of the camera:
Drill holes length
from 15 to 580 m
Diameter of the various drill holes
from ф 47 to ф 251 mm
Water acidity in the drill holes
– pH = 3 - 7
Maximal temperature of the water
– до 600С
Pressure
– min 60 Bar.
Resistance to adverse weather conditions (rain, snow, temperature fluctuations, wind, etc.)
3. Acoustic camera model, type and technical characteristics:
One (1) acoustic camera with embedded inclinometer to document drill holes with the needed
associated equipment and software together with the device for measuring the clear opeming of the
drill holes.
General technical characteristics:
3.1. Outer diameter of the camera – according to the minimal drill hole diameter – ф 47 mm;
3.2. Weight
– minimal possible weigh
3.3. Length
– minimal while preserving full functionality
3.4. Rotating frequency of the reflection mirror per 1 second – min 5 revolutions per second.
3.5. Rotation of the mirror – 0 – 360 0;
3.6. Image orientation mechanism – 3-axial magnitometer and 3-axial accelerometer.
3.7. Inclinometry – with accuracy +/– 0,5 0
3.8. Azimuth measurement – with accuracy +/– 1,5 0
-
Needed accessories:
- Devices for centering the camera for drill holes with diameter 47 mm to 251 mm – 1 set for
the different diameters (ф47; ф63,50; ф75,70; ф96,10; ф165; ф251)
- Calibrator and spare parts
- Motorized reel crab on the surface with 580-meter-long cable to adjust speed, tripod
- Device for data collection and reading (logger), computer configuration
- The electric power supply has to be fed with accumulators, possibility for spare power
supply (220V);
- Information processing software:
o Image recording module
o Image analysis software
o Software for correlating the information from several adjacent drill holes
o Software for drill hole columns
o Software for analysis and characteristics of cracks and faults.
Technical documentation accompanying the delivery and training:
o Technical description of the equipment – 1 copy in Bulgarian
o Catalogue of spare parts, consumables and components – 2 (two) sets
o Operation and maintenance instruction - 1 copy in Bulgarian
o Full description of the controlling software including platform, programming language,
compatibility with operational systems and databases, possibility for building up
additional interfaces to external systems shall be provided.
o Manual with the most common errors and recommendations for their troubleshooting 1 copy in Bulgarian
o Complete documentation on the administration, user manual and equipment
maintenance manual – 1 paper copy and 1 CD in Bulgarian.
o Training how to work with the camera and software shall be given to at least two
specialists from Assarel-Medet JSC.
o Training how to maintain and service the camera.
2