Overview
Stage | Production |
Mine Type | Open Pit |
Commodities |
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Mining Method |
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Production Start | ... |
Mine Life | 2026 |
Ada Tepe is one of the highest grade open pit gold mines in the world. |
Source:
p. 35
Dundee Precious Metals Krumovgrad (DPMK), a 100% subsidiary of Dundee Precious Metals (DPM), was awarded the Krumovgrad licence area (130 km2) on 12 June 2000 in accordance with the Agreement of Prospecting and Exploration reached with the Bulgarian Ministry of Economy.
Contractors
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Deposit Type
- Epithermal
- Vein / narrow vein
Summary:
The Ada Tepe deposit is a prime example of a high-level epithermal gold-silver deposit, formed during the Neogene within the Southern Rhodope tectonic zone. It is characterised as a low-sulphidation epithermal gold silver deposit. These deposit types are common throughout the world and form in association with volcanic arcs along subduction zones on plate boundaries
The Ada Tepe deposit is a low-sulphidation adularia-sericite gold-silver epithermal deposit located within Palaeocene sedimentary rocks overlying the north-eastern end of the Kessebir core complex.
The gold precipitates predominantly in the veins. The Ada Tepe deposit shows a multiphase history of formation with several brecciation and vein emplacement events resulting in complex overprinting infill stages and crosscutting relationships between the veins.
Two major styles of mineralisation are apparent at Ada Tepe:
• Initial stage of mineralisation hosted by a massive, shallow-dipping (15° north) siliceous body forming the hangingwall to the detachment and defining the contact between the core complex and overlying sedimentary rocks. This mineralisation is termed the “Wall Zone” by local geologists and displays multiple stages of veining and brecciation.
• Second phase of mineralisation represented by steep dipping veins that exhibit textures indicative of formation within an epithermal environment. These veins have a predominant east-west strike, crosscut the s ........
Summary:
The mining methods used at the Ada Tepe pit are conventional excavator and truck methods typical for this type and style of gold-silver mineralisation. Drilling and blasting of ore and waste is conducted over bench heights of 5 m and explosives are delivered to the hole by the drill and blast contractor. Hydraulic excavators are used to achieve good selectivity in conjunction with good blasting practice and mine to a 2.5 m flitch height. Ore and waste are generally loaded to 40-tonne capacity off-highway haul trucks to a ROM stockpile or to the IMWF.
All the production fleet is principally sourced from Caterpillar. In addition to the main equipment units there are support equipment including graders, water trucks, lighting towers and mobile maintenance service units. Mining operations are conducted in two 8.0-hour shifts per day. The mining production rate is about 3.2 Mtpa total material.
Pit Design
The selected economic pit shell 25 (effectively $1,600/oz) was used to drive the pit design work. The pit design was checked against the Whittle shells to ensure they match reasonably well. The difference between the design and the guiding pit shell is minimal with less than 3% loss in ore and less than 1% change in total tonnage. This is considered good volumetric compliance. The total net cash flow of the design was 2% less than the optimised pit shell and again is considered good compliance.
The ultimate and phase pits were designed foll ........
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Flow Sheet:
Summary:
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Pipelines and Water Supply
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Reserves at December 31, 2022:
Mineral Reserves for Ada Tepe are based on a gold cut-off grade of 0.6 g/t for the Upper Zone and Overburden and of 0.8 g/t for the Wall calculated using metal prices of $1,400/oz Au, $20/oz Ag for the pit optimization. The optimized pit was selected based on a revenue factor of 1.14.
Mineral Resources for Ada Tepe are based on a gold cut-off grade of 0.6 g/t for the Upper Zone and Overburden and of 0.8 g/t for the Wall Zone and Basement mineralization calculated using a gold price of US$1,600/oz.
Category | Tonnage | Commodity | Grade | Contained Metal |
Proven
|
2.49 Mt
|
Gold
|
5.19 g/t
|
0.415 M oz
|
Proven
|
2.49 Mt
|
Silver
|
3.13 g/t
|
0.25 M oz
|
Measured
|
0.08 Mt
|
Gold
|
4.27 g/t
|
0.011 M oz
|
Measured
|
0.08 Mt
|
Silver
|
3.19 g/t
|
0.008 M oz
|
Indicated
|
0.02 Mt
|
Gold
|
3.83 g/t
|
0.002 M oz
|
Indicated
|
0.02 Mt
|
Silver
|
2.94 g/t
|
0.002 M oz
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Measured & Indicated
|
0.1 Mt
|
Gold
|
4.19 g/t
|
0.013 M oz
|
Measured & Indicated
|
0.1 Mt
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Silver
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3.15 g/t
|
0.01 M oz
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Inferred
|
0.01 Mt
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Gold
|
4.04 g/t
|
0.001 M oz
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Inferred
|
0.01 Mt
|
Silver
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2.24 g/t
|
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Corporate Filings & Presentations:
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