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Bulgaria
Ada Tepe Mine

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 Location:
3 km S from Krumovgrad, Bulgaria

  Address:
1 Hristo Botev St. District of Kardzhali
Krumovgrad
Bulgaria
6900
Phone  ...  Subscription required
Fax+359-0-3641-7093
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Processing
  • Flotation
Mine Life2026
Pre-stripping and stockpiling of ore started in July 2018, followed by first concentrate production in March 2019 and ramp up to commercial production levels in June 2019.
Latest NewsDundee Corporation Announces Fourth Quarter and Year End 2020 Financial Results and Management Change     March 30, 2021


Owners & OPERATOR

Source: p. 4
CompanyInterestOwnership
Dundee Precious Metals Inc. 100 % Indirect
Dundee Precious Metals Krumovgrad EAD (operator) 100 % Direct

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.

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 shallow-dipping siliceous Wall Zone mineralisation, and extend upwards into the sedimentary breccia unit above the Wall Zone. This phase of mineralisation has been locally termed the “Upper Zone”.

The initial stage Wall Zone mineralisation is interpreted to be associated with early silica flooding and relatively low gold grades. However, regions of the Wall Zone through which well-developed Upper Zone vein mineralisation passes are typically thicker, more intensely brecciated and contain epithermal vein and hydraulic breccia infill textures and associated high gold grades that are not present in regions where Upper Zone vein mineralisation is absent. These thick strongly continuous regions of high-grade Wall Zone mineralisation generally thin and diminish in grade away from and between regions of well-developed Upper Zone vein mineralisation.

Typical epithermal textures present at the Ada Tepe deposit include the following:
• Crustiform and colloform banding
• Chalcedonic banding
• Bladed silica replacement textures after carbonate
• Compositionally zoned crystals
• Hydraulic breccia textures
• Late-stage carbonate veins.

The textural style and grade of mineralisation at Ada Tepe, high grades in association with open-space fill textures, such as bladed silica replacement after carbonate (i.e. evidence of boiling), hydrothermal breccias and also the presence of sinter material, suggests proximity to the paleo surface and a lowsulphidation nature of mineralisation.

The Ada Tepe mine is approximately 600 metres long (north-south), and up to 300-350 metres wide (east-west). The wall zone is up to 30 metres thick. The thickness of the Upper Zone vein mineralization is very variable, from less than one metre thick, to more than 30 metres thick. The Wall Zone exhibits very good continuity. The Upper Zone vein system exhibits less continuity than the Wall Zone, necessitating a higher drilling density that has been applied during the delineation of the Ada Tepe mine.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The mining methods used at the Ada Tepe pit are conventional excavator and truck methods. 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 graders and water trucks as well as various support and service equipment in use. Mining operations are conducted in two 8.0-hour shifts per day. The mining production rate is about 3 Mtpa total material.


Crushing and Grinding
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher 1
Cone crusher ....................... Subscription required 1
SAG mill ....................... Subscription required 6.71m x 3.96m 3000 kW 1
Stirred mill ....................... Subscription required 355 kW 1
Vertical mill / Tower ....................... Subscription required 932 kW 2


Processing

  • Flotation

Flow Sheet: Subscription required

Summary:

The Ada Tepe process plant and associated service facilities handles ROM ore from the mine and produces a gold-bearing concentrate for shipment to a smelter. The process encompasses crushing and grinding of the ROM ore, followed by froth flotation to produce a gold-bearing concentrate. Tailings is thickened to a sufficient density to enable deposition in the IMWF.

The Ada Tepe processing facility was designed to recover very fine free gold and silver from oxide host rock by flotation to a high-grade concentrate for off-site precious metals refining. Two main ore types are present within the orebody (i.e. Upper Oxide and Wall), where the latter represents a much lower proportion of mill feed tonnes but at considerably higher precious metals grades.

The key project and ore-specific criteria for the plant design are:
• Treatment of a maximum of 0.85 Mtpa of ore for each year of operation.
• Operation of the crushing plant on a 12 hours per day basis; mill ........

Recoveries & Grades:

CommodityParameter20202019
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required
Silver Recovery Rate, %  ......  Subscription required  ......  Subscription required
Silver Head Grade, g/t  ......  Subscription required  ......  Subscription required

Production:

CommodityProductUnits202120202019
Gold Metal in concentrate koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required
Gold Concentrate kt  ......  Subscription required  ......  Subscription required
Silver Metal in concentrate oz  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018
Tonnes processed  ......  Subscription required  ......  Subscription required
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required
Annual processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required
Annual mining rate  ......  Subscription required  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Reserves at July 31, 2020:
Mineral Resources 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 Zone calculated using metal prices of US$1,400/oz Au and US$17/oz Ag. There are no Mineral Resources remaining in the Wall Zone and Basement Zone, once Mineral Reserves have been removed.

Mineral Reserves have been estimated using a cut-off of 0.6 g/t Au for the Upper Zone, and 0.8 g/t Au for the Wall Zone. Long-term metal prices assumed for the evaluation of the Mineral Reserves are US$1,250/oz for Au and US$17/oz for Ag. Probable Ore includes stockpile inventory.

CategoryTonnage CommodityGradeContained Metal
Proven 2.79 Mt Gold 5.45 g/t 0.488 M oz
Proven 2.79 Mt Silver 3.36 g/t 0.301 M oz
Probable 1.48 Mt Gold 3.58 g/t 0.17 M oz
Probable 1.48 Mt Silver 2.38 g/t 0.113 M oz
Proven & Probable 4.26 Mt Gold 4.8 g/t 0.658 M oz
Proven & Probable 4.26 Mt Silver 3.02 g/t 0.414 M oz
Inferred 0.32 Mt Gold 2.09 g/t 0.021 M oz
Inferred 0.32 Mt Silver 1.51 g/t 0.015 M oz

Commodity Production Costs:

CommodityUnits202120202019
Total cash costs Gold USD  ......  Subscription required†  ......  Subscription required†
Total cash costs (sold) Gold USD  ......  Subscription required†  ......  Subscription required†
All-in sustaining costs (sold) Gold USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units20202019
Total operating costs ($/t milled) USD 40.149.3

Financials:

Units202120202019
Capital expenditures (planned) M USD  ......  Subscription required
Growth Capital M USD  ......  Subscription required  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required
Revenue M USD  ......  Subscription required  ......  Subscription required
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required
After-tax Income M USD  ......  Subscription required  ......  Subscription required
EBITDA M USD  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required


Heavy Mobile Equipment as of July 31, 2020:
HME TypeModelQuantityLeased or
Contractor
Dozer (crawler) ....................... Subscription required 2
Dozer (crawler) ....................... Subscription required 1
Drill ....................... Subscription required 2 Leased
Excavator ....................... Subscription required 3
Excavator ....................... Subscription required 2
Grader ....................... Subscription required 1
Loader ....................... Subscription required 1
Loader (FEL) ....................... Subscription required 1
Truck (dump) ....................... Subscription required 7
Truck (haul) ....................... Subscription required 4
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 18, 2021
....................... Subscription required ....................... Subscription required Subscription required Mar 18, 2021
....................... Subscription required ....................... Subscription required Subscription required Mar 18, 2021
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2020
Subscription required 2019
Subscription required 2018

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Information Form 2018
Annual Report 2018
Annual Information Form 2017
Technical Report 2017
Corporate Presentation 2016
Technical Report 2014
Subscription required - Subscription is required.

News:

NewsDate
Dundee Corporation Announces Fourth Quarter and Year End 2020 Financial Results and Management Change March 30, 2021
Dundee Precious Metals Files Technical Report on the Ada Tepe Gold Mine November 23, 2020
Dundee Precious Metals Announces Updated Mineral Resource and Mineral Reserve Estimate for the Ada Tepe Gold Mine and Improved LOM Plan October 16, 2020
Dundee Precious Metals Announces Receipt of Final Operating Permits for its Ada Tepe Mine in Bulgaria August 30, 2019
Dundee Precious Metals Achieves Major Milestone With First Gold Concentrate Production From Its Krumovgrad Open Pit Gold Mine March 14, 2019

Aerial view:

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