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Bosnia and Herzegovina
Vares Project

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 Location:
35 km N from Sarajevo, Bosnia and Herzegovina

  Project Contacts:
Tisovci bb 71 330
Bosnia and Herzegovina
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Overview

StageConstruction
Mine TypeOpen Pit & Underground
Commodities
  • Gold
  • Silver
  • Zinc
  • Lead
  • Barite
  • Copper
  • Antimony
  • Pyrite
Mining Method
  • Longitudinal open stoping
  • Longhole open stoping
  • Transverse open stoping
  • Backfill
Processing
  • Dewatering
  • Filter press plant
  • Jameson Cell Flotation
  • Sulfuric acid (reagent)
  • Flotation
Mine Life14 years (as of Jan 1, 2020)
The Vares Silver Project hosts two Mineral Resources; the Rupice underground deposit (“Rupice”) and the Veovaca open pit deposit (“Veovaca”).

The Vares Processing Plant has been designed around the ore from the Rupice Underground Mine, as this is the highest value ore. Veovaca open pit: barite recovery and sulphide (pyrite) recovery to be considered in a future development phase, so it was decided to defer the Veovaca open pit from the 2021 DFS mine plan until further work has been completed.
Latest NewsAdriatic Completes Vares Silver Project DFS     August 19, 2021


Owners

Source: p. 62
CompanyInterestOwnership
Adriatic Metals Plc 100 % Indirect
The Rupice deposit is located within the Company’s 100% owned Concession.

Deposit Type

  • Breccia pipe / Stockwork
  • Carbonate hosted


Summary:

The host rocks at Rupice comprises Middle Triassic limestone, dolostone, calcareous and dolomitic marl, and a range of mostly fine-grained siliciclastic rocks including cherty mudstone, mudstone, siltstone and fine grained sandstone. The main mineralised horizon is a brecciated dolomitic unit that dips at around 50o to the northeast and has been preferentially mineralised with base, precious and transitional metals. The Triassic sequence and has been intensely deformed both by early stage ductile shearing and late stage brittle faulting.

The Rupice polymetallic mineralisation consists of sphalerite, galena, barite and chalcopyrite with gold, silver, tetrahedrite, boulangerite and bournonite, with pyrite. The majority of the high-grade mineralisation is hosted within the brecciated dolomitic unit, which is offset and cut by northwest striking, westerly dipping syn-post mineral faulting. This faulting displaces the mineralised body up to 20 metres in places. Thickening of the central portion of the orebody occurs where these faults flexure and deform. Mineralised widths up to 65 metres true thickness are seen in the central portion of the orebody.

To date, the massive sulphide mineralisation at Rupice has a defined strike length of 650 metres, with an average true-width thickness of around 20 metres. However, mineralisation at Rupice still remains open towards the north and down-dip to the south.


Mining Methods

  • Longitudinal open stoping
  • Longhole open stoping
  • Transverse open stoping
  • Backfill


Summary:

The Vares Silver Project hosts two Mineral Resources; the Rupice underground deposit (“Rupice”) and the Veovaca open pit deposit (“Veovaca”). Veovaca open pit removed from scope of study.

Access to the underground workings will be via two declines developed from the surface accessing the orebody via further development of ramps, level access drives and footwall drives. All the development access will be suitable for trackless equipment.

The underground stoping will be divided into two main mining method zones:
• Transverse Longhole Open Stoping zone (“TLOS”)
• Longitudinal Longhole Open Stoping zone (“LLOS”)

The TLOS zone will be below the 1,065 level and the LLOS zone will be from and above the 1,065 level. TLOS will be used in areas where the ore zone thickness is greater than 20 m. Stopes will be oriented in a transverse fashion with stope access drives orientated from the footwall towards the hanging wall, perpendicular to the general orebody strike. LLOS will be used in areas where the ore zone thickness is less than 20 m. Stopes will be oriented in a longitudinal fashion along a strike drive.

Primary stopes represent the initial phase of production mining within the TLOS section of the mine. Primary stopes are mined in a “chequerboard” fashion on each level, with temporary pillars left between the primary stopes. The primary stopes are then backfilled with either Cemented Aggregate Fill or Paste Aggregate Fill, or a combination of both. Once the fill has cured, the temporary pillars between the primary stopes can then be mined out. These pillars are known as secondary stopes.

The primary access to the underground workings will be via two separate access declines developed from surface. A third, primary main return airway decline has replaced the previously proposed return air raise-bore shaft.

Following the excavation of the box cuts and installation of appropriate portal support systems, the declines will be developed with dimensions of 5.5 m wide X 5.5 m high. The main return airway and middle access decline will be developed at a maximum gradient of 14 % (1 in 7) while the lower access decline will be developed at a maximum gradient of 16 %
(1 in 6). The lower access decline will serve as the main ingress route into the mine while the middle decline will serve as the main egress, hence allowing for dedicated traffic in one direction with minimal disruption to the hauling operations. The remaining ramps going up and down from the different underground access positions are all developed at the 1:7 inclination.

Secondary development will consist of level access drives that are driven to connect the ramps with the footwall drives on each sub-level. The footwall drives are designed with a minimum stand-off of 25 m from the orebody and will have dimensions of 5.0 m wide X 5.5 m high.

The sub-levels will be spaced at 20 m vertical intervals. The lower 12 sub-levels will serve as access to transverse longitudinal stopes while the upper five sub-levels will be used as access for longitudinal long hole stopes. The transverse stopes will be accessed along horizontal cross-cut drives leading from the footwall drive at dimensions of 5.0 m wide X 5.0 m high and developed at right angles to the strike of the deposit. The cross cuts will be spaced 15 m apart along strike to adequately traverse the deposit and provide for a 15 m stope strike drilling envelope in a primary-secondary stope sequence and retreating from the hanging wall to the footwall (direction).

The longitudinal stopes will be accessed along a strike orientated ore drive, with dimensions of 5.0 m wide X 5.0 m high, which exits the sub-level access drive. There will be one ore drive per sub-level for the longitudinal stopes. The ore drive is developed along strike to the distal end of the sub-level and then stoping occurs in a retreat direction along the ore drive. For the longitudinal and transverse stopes, the mine design of the rings has the holes spaced to optimise drilling and to allow for a suitable Powder Factor whilst not over breaking the stopes and fracturing the surrounding secondary stopes. The loading of the blasted material be at the intersection point of the crosscut and the footwall drive and hauled via the internal ramp and decline to surface and tipped onto one of three Run of Mine (“ROM”) stockpiles depending upon the grade.

The mine design comprises largely of the access and ventilation portal areas, main declines, trackless ramps sub-level access drive, and the sub-level footwall drives.

The long-hole drilling metres are calculated from the stope drill and blast designs concluded, which assume a factor of 7 tonnes of ore per blast hole. Two longhole drill rigs will be employed to do all the slotting, the smaller level ventilation rises and the stope drilling.

The mining cycle will consist of the following sequential activities:
• ore drive development
• hanging wall cable bolting
• stope slotting
• stope production drilling
• charging and blasting
• Remote-controlled stope loading
• truck loading at stockpiles
• hauling
• backfill wall installation
• backfill plug pour
• complete stope backfilling
• allow sufficient time to cure prior to starting any neighbouring stope slotting activities.

The Rupice Underground Mine production rate is designed to match the nameplate capacity of the Vares Processing Plant at 800,000 tonnes per annum. Stope development of the Rupice Underground Mine will start eight months prior to commissioning of the Vares Processing Plant. At the time of starting commissioning there will be approximately 210,000 tonnes of high-grade ore, 190,000 tonnes of medium-grade and 26,000 tonnes of low-grade ore – in total about six months at full production. During the mine life, sufficient ore is produced to maintain the Vares Processing Plant production rate, with excess lowergrade ore being stockpiled for treatment later in the mine life. During the later stages of the mine life, the underground production rate drops off due to reduced stoping areas being available and the cyclic nature of the cut-and-fill mining methods.


Crushing and Grinding
Flow Sheet: Source
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher 800mm x 1045mm 1
Cone crusher 2
Ball mill 4.3m x 7.5m 2400 kW 1
Stirred mill 2

Summary:

Crushing
ROM material will be deposited by the underground trucks at one of three ROM stockpiles near the portal.

A front-end loader will reclaim ore from the stockpiles in accordance with the blending regime required by the processing plant and deposit the ore into the blend ore bin, (crushing plant feed bin). For longer tramming distances from stockpiles the loader will load the two 30 t trucks provided and they will travel to and tip into the blend ore bin. The blend ore bin has a nominal capacity of 85 t and will be equipped with a 600 mm static grizzly to prevent oversize material from entering the crushing circuit. A vibrating grizzly feeder will feed the material from the bin to the primary crusher which will allow finer material to bypass the crusher.

The primary crusher will be a single-toggle jaw type crusher and will be designed to reduce the feed size from 80% passing 427 mm to 80% passing 150 mm. The crushed material will combine with the undersize material from the grizzly feeder which will lower the 80th percentile of the particle size distribution from 150 mm to 121 mm. The ore will then report to the secondary cone crusher which would be operated in open circuit. The secondary crushing stage would further reduce the 80% passing size of 121 mm to 51 mm. The secondary crusherdischarge would then be conveyed to the triple deck sizing screen. The top, middle and lower deck screen apertures will be 75 mm, 28 mm and 12 mm respectively. Oversized material on the sizing screen decks will report to the tertiary cone crusher. The tertiary cone crusher is operated in closed circuit and will reduce the feed size from 80% passing of 50 mm to 12 mm. The tertiary crushed product is combined with the secondary crusher product prior to reaching the triple deck sizing screen. The undersize of the sizing screen provides the final product of the crushing circuit and will produce an 80% passing crushed ore product of 7mm.

The same crushing plant will also be used to produce aggregate for both PAF and CAF to the backfill plant. When producing PAF the crushing circuit will operate exactly as described above to produce the crushed ore material but will be fed with waste rock. A diverter gate system will direct the undersize of the sizing screen to a dedicated PAF stockpile that provides material with a 100% passing size of 12 mm. When producing CAF the crushing operation is truncated and will bypass the tertiary crusher closed loop circuit. The undersize of the screen will be redirected to a CAF stockpile that provides 100% passing size of 75 mm. The crushing plant has been sized to handle the combined monthly requirements for both ore and aggregate. It will be operated on a batch basis, utilising available stockpile and coarse ore bin capacity.

Crushed ore will be trucked 24.5 km from the Rupice Surface Infrastructure site to the Vares Processing Plant and end-dumped into a crushed ore hopper with a capacity of 37.5 t. The crushed ore will be fed by a belt feeder to a belt conveyor. The belt conveyor will transport the crushed ore to a diverter gate, where it will be discharged into two coarse ore bins. Each bin provides a live residence time of 23 hours and a corresponding capacity of 2,260 tonnes of ore on a wet basis. Ore will be reclaimed from the bins by belt feeders and discharged to the ball mill feed conveyor.

The crushed ore bins provide surge capacity between the crushing system and the ball mill and will be independently filled and discharged. The throughput to the mill will be controlled by adjusting the speed of the crushed ore bin belt feeders based on the ball mill feed conveyor weightometer output and the mill control system set-point.

Grinding
The grinding circuit consists of a ball mill and cyclones. The grinding circuit will be designed to reduce ore from an 80% passing size of 7 mm to 40 µm. The ball mill will be a single pinion overflow mill, operating in a closed circuit. The mill has an inside diameter of 4.3 m and an effective grinding length of 7.5 m. The mill receives crushed ore and process water at a variable flow rate to achieve the correct pulp density. Lime, zinc sulphate and sodium metabisulphite (SMBS) are also dosed to the ball mill to condition the ore prior to the flotation circuit. The ball mill discharge passes over a slotted trommel screen with an aperture size of 10 mm x 25 mm. The ball mill will be charged with high chrome grinding media, ranging in diameter from 25-40 mm utilising the grinding building hoist and ball kibble.

Operators will monitor the grinding mills discharge density, cyclone overflow and underflow densities, power draw, cyclone pressure, and other parameters to maintain a product size of 80% passing 40 µm.


Processing

  • Dewatering
  • Filter press plant
  • Jameson Cell Flotation
  • Sulfuric acid (reagent)
  • Flotation

Flow Sheet: Subscription required

Summary:

The 2021 DFS process design is based on treating ore from the Rupice Underground Mine through a sequential flotation process to produce a silver-lead concentrate and a zinc concentrate.

The Vares Silver Project has two processing sites; the Rupice Surface Infrastructure site and the Vares Processing Plant site. The Rupice Surface Infrastructure site, which is a greenfield site, is located above the Rupice Underground Mine site.

ROM hauled to surface from the Rupice Underground Mine will be deposited onto one of three surface stockpiles based on grade, from which the ore will be reclaimed, by a front-end loader, (and trucks, depending on distance of the stockpile from the crusher feed bin) into the three-stage crushing plant feed bin. Waste rock will be processed through the same crushing plant to produce the required aggregate materials used for the backfill plant. The ore and waste rock will be processed on a batch basis through the crushing plant and the plant ........

Recoveries & Grades:

CommodityParameterAvg. LOM
Silver Recovery Rate, % 71
Silver Concentrate Grade, g/t 2,051
Zinc Recovery Rate, % 80
Zinc Head Grade, % 4.6
Zinc Concentrate Grade, % 57.4

Projected Production:

CommodityProductUnitsAvg. AnnualLOM
Gold Payable metal koz 218
Silver Payable metal koz  ......  Subscription required
Silver Concentrate kt  ......  Subscription required
Zinc Payable metal M lbs  ......  Subscription required
Zinc Concentrate kt  ......  Subscription required
Lead Payable metal kt  ......  Subscription required
Copper Payable metal kt  ......  Subscription required
Antimony Payable metal kt  ......  Subscription required
Silver Equivalent Payable metal koz  ......  Subscription required  ......  Subscription required
Barite Mineral kt  ......  Subscription required
Pyrite Concentrate kt  ......  Subscription required

Operational Metrics:

Metrics
Ore tonnes mined, LOM  ......  Subscription required  ......  Subscription required
Plant annual capacity  ......  Subscription required  ......  Subscription required
Tonnes processed, LOM  ......  Subscription required  ......  Subscription required
Annual ore mining rate  ......  Subscription required  ......  Subscription required
Daily ore mining rate  ......  Subscription required  ......  Subscription required
* According to 2021 study.
Subscription required - Subscription is required.

Reserves at August 19, 2021:
Mineral Resources cut-off grade of 50g/t silver equivalent has been applied (Rupice deposit).
Mineral Resources cut-off grade of 0.6% ZnEq has been applied (Veovaca deposit).

CategoryOreTypeTonnage CommodityGradeContained Metal
Probable In-Situ (UG) 7.3 Mt Gold 1.9 g/t
Probable In-Situ (UG) 7.3 Mt Silver 202 g/t
Probable In-Situ (UG) 7.3 Mt Zinc 5.7 %
Probable In-Situ (UG) 7.3 Mt Lead 3.6 %
Probable In-Situ (UG) 7.3 Mt Copper 0.6 %
Probable In-Situ (UG) 7.3 Mt Antimony 0.23 %
Probable In-Situ (UG) 7.3 Mt Silver Equivalent 485 g/t
Probable In-Situ (UG) 7.3 Mt Zinc Equivalent 13 %
Indicated In-Situ (OP) 5.3 Mt Gold 0.1 g/t 14 koz
Indicated In-Situ (UG) 9.5 Mt Gold 1.6 g/t 500 koz
Indicated In-Situ (OP) 5.3 Mt Silver 50 g/t 9 M oz
Indicated In-Situ (UG) 9.5 Mt Silver 176 g/t 54 M oz
Indicated In-Situ (OP) 5.3 Mt Zinc 1.6 % 83 kt
Indicated In-Situ (UG) 9.5 Mt Zinc 4.9 % 465 kt
Indicated In-Situ (OP) 5.3 Mt Lead 1 % 55 kt
Indicated In-Situ (UG) 9.5 Mt Lead 3.1 % 294 kt
Indicated In-Situ (OP) 5.3 Mt Barite 16 % 860 kt
Indicated In-Situ (UG) 9.5 Mt Barite 29 % 2,730 kt
Indicated In-Situ (UG) 9.5 Mt Copper 0.5 % 52 kt
Indicated In-Situ (UG) 9.5 Mt Antimony 0.2 % 21 kt
Indicated In-Situ (OP) 5.3 Mt Silver Equivalent 225 g/t 38 M oz
Indicated In-Situ (UG) 9.5 Mt Silver Equivalent 580 g/t 177 M oz
Indicated In-Situ (OP) 5.3 Mt Zinc Equivalent 4.3 % 230 kt
Indicated In-Situ (UG) 9.5 Mt Zinc Equivalent 18.6 % 1,771 kt
Inferred In-Situ (OP) 2.1 Mt Gold 0.1 g/t 4 koz
Inferred In-Situ (UG) 2.5 Mt Gold 0.3 g/t 27 koz
Inferred In-Situ (OP) 2.1 Mt Silver 17 g/t 1 M oz
Inferred In-Situ (UG) 2.5 Mt Silver 49 g/t 4 M oz
Inferred In-Situ (OP) 2.1 Mt Zinc 1.1 % 23 kt
Inferred In-Situ (UG) 2.5 Mt Zinc 0.9 % 23 kt
Inferred In-Situ (OP) 2.1 Mt Lead 0.5 % 11 kt
Inferred In-Situ (UG) 2.5 Mt Lead 0.7 % 18 kt
Inferred In-Situ (OP) 2.1 Mt Barite 6 % 123 kt
Inferred In-Situ (UG) 2.5 Mt Barite 9 % 218 kt
Inferred In-Situ (UG) 2.5 Mt Copper 0.2 % 4 kt
Inferred In-Situ (UG) 2.5 Mt Antimony 0.1 % 3 kt
Inferred In-Situ (OP) 2.1 Mt Silver Equivalent 116 g/t 8 M oz
Inferred In-Situ (UG) 2.5 Mt Silver Equivalent 144 g/t 12 M oz
Inferred In-Situ (OP) 2.1 Mt Zinc Equivalent 2.2 % 47 kt
Inferred In-Situ (UG) 2.5 Mt Zinc Equivalent 4.6 % 115 kt
Total Resource In-Situ (OP) 7.4 Mt Gold 0.1 g/t 18 koz
Total Resource In-Situ (UG) 12 Mt Gold 1.4 g/t 526 koz
Total Resource In-Situ (OP) 7.4 Mt Silver 41 g/t 10 M oz
Total Resource In-Situ (UG) 12 Mt Silver 149 g/t 58 M oz
Total Resource In-Situ (OP) 7.4 Mt Zinc 1.4 % 106 kt
Total Resource In-Situ (UG) 12 Mt Zinc 4.1 % 488 kt
Total Resource In-Situ (OP) 7.4 Mt Lead 0.9 % 66 kt
Total Resource In-Situ (UG) 12 Mt Lead 2.6 % 312 kt
Total Resource In-Situ (OP) 7.4 Mt Barite 13 % 984 kt
Total Resource In-Situ (UG) 12 Mt Barite 25 % 2,948 kt
Total Resource In-Situ (UG) 12 Mt Copper 0.5 % 56 kt
Total Resource In-Situ (UG) 12 Mt Antimony 0.2 % 24 kt
Total Resource In-Situ (OP) 7.4 Mt Silver Equivalent 193 g/t 46 M oz
Total Resource In-Situ (UG) 12 Mt Silver Equivalent 499 g/t 193 M oz
Total Resource In-Situ (OP) 7.4 Mt Zinc Equivalent 3.7 % 275 kt
Total Resource In-Situ (UG) 12 Mt Zinc Equivalent 16.1 % 1,926 kt

Commodity Production Costs:

CommodityUnitsAverageAverage
Cash costs Silver Equivalent USD  ......  Subscription required *
Total cash costs Silver Equivalent USD  ......  Subscription required *  ......  Subscription required *
Total cash costs Zinc Equivalent USD  ......  Subscription required *
All-in sustaining costs (AISC) Silver Equivalent USD  ......  Subscription required *
Assumed price Antimony USD  ......  Subscription required *  ......  Subscription required *
Assumed price Lead USD  ......  Subscription required *  ......  Subscription required *
Assumed price Zinc USD  ......  Subscription required *  ......  Subscription required *
Assumed price Copper USD  ......  Subscription required *  ......  Subscription required *
Assumed price Silver USD  ......  Subscription required *  ......  Subscription required *
Assumed price Gold USD  ......  Subscription required *  ......  Subscription required *
Assumed price Barite USD  ......  Subscription required *
* According to 2021 study / presentation.
Subscription required - Subscription is required.

Operating Costs:

Units20212020
UG mining costs ($/t mined) USD 24.1 *
Combined mining costs ($/t mined) USD  ......  Subscription required
UG mining costs ($/t milled) USD  ......  Subscription required
Combined mining costs ($/t milled) USD  ......  Subscription required
Processing costs ($/t milled) USD  ......  Subscription required  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required  ......  Subscription required
* According to 2020 study.
Subscription required - Subscription is required.

2021 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Closure costs $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
Income Taxes $M EUR  ......  Subscription required
After-tax NPV @ 8% $M USD  ......  Subscription required
After-tax IRR, %  ......  Subscription required
After-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.

Proposed Heavy Mobile Equipment as of August 19, 2021:
HME TypeSizeQuantityLeased or
Contractor
Bolter ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNamePhoneProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 10, 2021
....................... Subscription required ....................... Subscription required Subscription required Oct 15, 2020
....................... Subscription required ....................... Subscription required Subscription required Sep 10, 2021
....................... Subscription required ....................... Subscription required Subscription required Sep 10, 2021
....................... Subscription required ....................... Subscription required Subscription required Sep 10, 2021
....................... Subscription required ....................... Subscription required Subscription required Sep 10, 2021
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Sep 10, 2021
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2021
Subscription required 2020

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
Subscription required - Subscription is required.

News:

NewsDate
Adriatic Completes Vares Silver Project DFS August 19, 2021
Meridian Mining Announces PEA Results for Bom Futuro Tailings Project December 7, 2017

Subscription required - Subscription is required.

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