Overview
Stage | Production |
Mine Type | Underground |
Commodities |
|
Mining Method |
- Cut & Fill
- Sub-level caving
- Paste backfill
|
Production Start | ...  |
Mine Life | 2039 |
The Sasa operation is an underground mine, and the processing plant uses froth flotation to produce a zinc concentrate and a lead concentrate containing silver.
Central Asia Metals team has begun construction work for the Cut and Fill Project to enable the extraction of the maximum resources in a safer, more sustainable and efficient manner as well as improving the storage of tailings for the life of the mine. |
Source:
p. 144
Sasa project is wholly owned by and exploration is operated by Rudnik SASA DOOEL, a wholly-owned subsidiary of CAMl (Central Asia Metals PLC).
Contractors
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Deposit Type
- Skarn
- Hydrothermal
- Replacement
Summary:
SASA Mine comprises the Svinja Reka, Golema Reka and Kozja Reka lead-zinc-silver deposits, which lie within the Serbo-Macedonian Massif, a belt which extends through Serbia, Macedonia, Bulgaria, and eastern Greece into Turkey and hosts a large number of lead-zinc deposits. The mineral deposits are located on the eastern flank of a Tertiary intermediate intrusive complex and related porphyry Cu-Mo system, within which a northwest striking stockwork alteration zone is developed. Lead-zinc-silver mineralisation occurs as stratiform deposits hosted predominantly by quartz-graphite schist and marbles of Lower Palaeozoic age at Svinja Reka and by gneisses at Golema Reka. The mineralisation is considered to relate to the intrusion of Tertiary volcanics. High-temperature hydrothermal fluids and bedding-parallel faulting are responsible for metasomatism of the host sediments, producing skarn and base metal mineralisation.
The well-defined, partially exploited, lenses of lead-zinc-silver mineralisation dip at approximately 35° to the south-west and typically range in true thickness from between 2 and 30 m. The mineralised lenses are present in parallel sheets (typically two or three bodies, namely the hanging wall, central and footwall orebodies), separated by an interburden with thicknesses of 1 to 10 m. The lenses pinch and swell along strike and down-dip. The mineral deposits are considered to be metasomatic skarn-hydrothermal deposits with replacement and bedding-paralle ........

Mining Methods
- Cut & Fill
- Sub-level caving
- Paste backfill
Summary:
Sasa is an underground zinc and lead mine that produces approximately 820,000 tonnes of ore each year. Accessed by adit, the Svinja Reka deposit is currently mined using a sub-level caving method, which utilises the geotechnical characteristics of the weak hanging wall to allow the rock to cave naturally into the void remaining after ore has been blasted.
Main haulage levels are at 80 metre intervals, with sub-levels every 7 metres. Ore drives are typically 3.5 metres by 3.5 metres. Ore is mined using a top down approach without backfill. Ore is drilled using single boom jumbos, blasted and then excavated with underground loaders.
From the second half of 2022 the Sasa team will transition to a new mining method, cut and fill stoping, with approximately 90% of ore being extracted using this method by 2024. The voids will then be backfilled with paste material containing tailings to provide support, rather than allowing the roof to cave as is the case with the current sub-level caving method.
Once blasted, 70% of the ore is then sent via ore passes to the 830m level where it is transported by rail wagons to the Golema Reka shaft for hoisting, and the remaining 30% is hauled to surface via the adit.
A total of 806,069 tonnes of ore were mined using the sub-level caving method during the 2022 year from the 990 metre and 910 metre working areas. The ore from the underground operations is hoisted via the Golema Reka shaft to surface (c.73 ........

Source:

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Flow Sheet:
Summary:

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Reserves at December 31, 2022:
The Svinja Reka Mineral Resource is reported based on a NSR cut-off of $46/t for Sub-Level Caving and $53/t for Cut and Fill and Long Hole Stoping and are based on metal price assumptions of $2,755/t for zinc, $2,290/t for lead and $22/oz for silver. The Golem Reka Mineral Resource is reported above a cut-off grade of 2% combined lead and zinc.
The Svinja Reka Ore Reserve is reported using a NSR cut-off of $46/t for Sub-Level Caving, $53/t for Cut and Fill and Long Hole Stoping and $37/t for Ore Development drives that are required to establish stope access and are based on metal price assumptions of $2,395/t for zinc, $1,992/t for lead and $19.3/oz for silver.
Category | Tonnage | Commodity | Grade | Contained Metal |
Probable
|
8.8 Mt
|
Lead
|
3.9 %
|
346 kt
|
Probable
|
8.8 Mt
|
Zinc
|
2.6 %
|
232 kt
|
Probable
|
8.8 Mt
|
Silver
|
27 g/t
|
7,662 koz
|
Indicated
|
11.6 Mt
|
Lead
|
4.4 %
|
509 kt
|
Indicated
|
11.6 Mt
|
Zinc
|
2.8 %
|
327 kt
|
Indicated
|
11.6 Mt
|
Silver
|
29.5 g/t
|
11,042 koz
|
Inferred
|
8.3 Mt
|
Lead
|
3.4 %
|
273 kt
|
Inferred
|
8.3 Mt
|
Zinc
|
1.6 %
|
133 kt
|
Inferred
|
8.3 Mt
|
Silver
|
14.3 g/t
|
3,798 koz
|
Total Resource
|
19.9 Mt
|
Lead
|
4 %
|
782 kt
|
Total Resource
|
19.9 Mt
|
Zinc
|
2.3 %
|
460 kt
|
Total Resource
|
19.9 Mt
|
Silver
|
23.2 g/t
|
14,840 koz
|
Pipelines and Water Supply
Source:

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HME Type | Model | Size | Quantity | Ref. Date |
Drill
|
.......................
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|
.......................
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Dec 31, 2021
|
Drill
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.......................
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|
.......................
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Dec 31, 2022
|
Drill jumbo (two boom)
|
.......................
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|
.......................
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Dec 31, 2021
|
Grader
|
.......................
|
|
.......................
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Sep 22, 2017
|
Jumbo
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.......................
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|
.......................
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Sep 22, 2017
|
Jumbo
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.......................
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|
.......................
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Sep 22, 2017
|
Jumbo
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.......................
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|
.......................
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Sep 22, 2017
|
Jumbo
|
.......................
|
|
.......................
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May 5, 2022
|
Loader
|
.......................
|
7 t
|
.......................
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Dec 31, 2021
|
Loader
|
.......................
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.......................
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Sep 22, 2017
|
Loader
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.......................
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.......................
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Sep 22, 2017
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Loader
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.......................
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.......................
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Sep 22, 2017
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Rockbreaker
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.......................
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.......................
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Sep 22, 2017
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Rockbreaker
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.......................
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.......................
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Dec 31, 2022
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Scoop Tram
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.......................
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.......................
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May 5, 2022
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Shotcreter
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.......................
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.......................
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May 5, 2022
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Telescopic Handler
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.......................
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.......................
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Dec 31, 2022
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Trans Mixer
|
|
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.......................
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Dec 31, 2021
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Truck (fuel / lube)
|
|
|
.......................
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Sep 22, 2017
|
Truck (service)
|
.......................
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|
.......................
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Sep 22, 2017
|
Truck (underground)
|
.......................
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20 t
|
.......................
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Dec 31, 2021
|
Truck (underground)
|
.......................
|
13 t
|
.......................
|
Sep 22, 2017
|
Truck (underground)
|
.......................
|
20 t
|
.......................
|
May 5, 2022
|
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