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Canada
Abcourt-Barvue Project

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 Location:
34 km E from Amos, Quebec, Canada

  Project Contacts:
475 avenue de l'Église
Rouyn-Noranda
Quebec, Canada
J0Z 1Y1
Phone  ...  Subscription required
Fax819-768-5475
EmailEmail
WebsiteWeb
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  • Filings & News

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Overview

StageFeasibility
Mine TypeOpen Pit / Underground
Commodities
  • Silver
  • Zinc
Mining Method
  • Truck & Shovel / Loader
  • Avoca
  • Backfill
Processing
  • Flotation
Mine Life13 years (as of Jan 1, 2019)
The project consists of three open pits, namely Barvue, Abcourt East and Abcourt West, and the development of an underground mine to produce a zinc-silver concentrate.
Latest NewsAdditions to the Update on the Abcourt-Barvue Feasibility Study     May 2, 2019


Owners

Source: p. 28
CompanyInterestOwnership
Abcourt Mines Inc. 100 % Direct

Deposit Type

  • VMS


Summary:

On the Abcourt-Barvue property, the volcanic sequence is represented by the Figuery Group which is bounded to the north by the Amos Group and to the south by the Landrienne Group. The Abcourt-Barvue deposit and related base metal occurrences are located in the Figuery Group.

The Abcourt-Barvue mineralized horizon strikes E-W in the western portion of the property. In the Abcourt shaft area, the mineralized horizon changes its strike from E-W to SE-NW in the Barvue portion of the deposit. On the property, the units have steep (75°) dips to the north with a well-developed E-W regional schistosity. The stratigraphic tops for these units have been documented in the field as being to the north.

The Abcourt-Barvue mineralized zone has a thickness ranging from 2 to 30 metres. The deposit has a known east-west strike length of 2.2 km. Mineralization has been delineated by diamond drilling to a maximum vertical depth of 425 m below the surface. Mineralized horizons are dipping at 75° to the north.

Zinc and silver are the main metallic constituents of the Abcourt-Barvue deposit and these metals are associated with sphalerite, native silver and argentite. The presence of some gold and copper has been observed. Gold is usually associated with silver and copper occurs mostly at the eastern limit of the Barvue deposit.

The main mineralization which is mostly made up of disseminated and bedded sphalerite and pyrite (up to 10% of the rock) is described as:

- iron-poor, honey brown and dark colour sphalerite (ZnFeS2), finely disseminated in the tuff agglomerate horizons concentrated generally to the north of the marker bed, with additional mineralization in the marker bed and in the shear zone;
- 1-2% disseminated pyrite (some encompassed within the sphalerite);
- minor galena (PbS), chalcopyrite (CuFeS2), native silver (Ag) and proustite (Ag3AsS3).

The thickness of the mineralized horizon tends to increase eastward, most of the sulphides being located in the Barvue area. Generally speaking, we can observe a zinc enrichment in both footwall and hanging walls of the mineralized zone which are generally separated by lower grade marginal material. These two sub-parallel zinc-enriched units are currently known over a total length of 2.2 km to a vertical depth of 600 metres.

The Abcourt-Barvue silver-zinc deposit is classified as disseminated volcanogenic sulphide deposit. It shares numerous similarities with the Mattabi-type volcanogenic sulphide deposit. The zinc and silver sulphides mineralization is composed of disseminated and bedded sphalerite and pyrite found in close association with felsic volcanoclastic rocks.


Mining Methods

  • Truck & Shovel / Loader
  • Avoca
  • Backfill


Summary:

The Abcourt-Barvue measured and indicated resources along the mineralized structure span a distance of 2 230 m (1 080 m west of the shaft in an E-W direction, and 1 150 m east of the shaft in a S49°E direction). The dip is 75° to 90° to the north.

In the Barvue sector, the ore lies in the south wall of the old pit, at its eastern extremity and below the current pit floor (at a depth of 76 m) to a maximum depth of 240 m. The mining proposal for Barvue includes deepening the pit to a depth of 166 m from surface and underground mining of the remaining resource.

In the Abcourt sector it is proposed to mine the upper part of the ore body by open pit to a maximum depth of 72 m. Mining will proceed underground under the pit using the Avoca cut- and-fill method to a depth of 150m to 200m with trackless equipment. Three declines will access the underground operation; the west, the central, and the east decline.

Open pit mining will be carried out using conventional truck and shovel method. Drilling will be performed by in-the-hole production drills. Blasting operations will use an emulsion ANFO (ammonium-nitrate fuel oil) explosive and a non-electric delay initiation system. An hydraulic shovel and a front-end loader will be used to load rigid haulage trucks.

For most of the open pit tonnages, haulage trucks will exit from Abcourt and Barvue pits onto a common haul road approximately 500m west of the mill site. Waste rock will be hauled to three (3) different storage areas. The West waste pad and the East waste pad are located approximately 1.7 km from the East Abcourt and the Barvue pit exits.

Over the first 5 years, open pit mining will occur at a maximum annual production rate of 6 Mt of rock per year of which 650 000 tonnes will be ore and the remaining tonnes will be waste rock and marginal ore.

The following parameters were used to design the open pits:
- Average mineralization dip: 75° to 90° to the north;
- Bench height:
1. Barvue pit: ± 17 m (in two cuts in ore);
2. Abcourt pits: 16 m (in two cuts in ore).
- Individual bench slope: 70° to 90°;
- Inter-ramp slope angle: 60°;
- Berm width: 7.5 – 11.0 m;
- Berm width to overburden slope: 6 m;
- Maximum depth of Barvue pit: 166 m;
- Maximum depth of Abcourt pits: 72 m;
- Ramp width:
1. Barvue and East Abcourt pits 8 m and 16 m;
2. West Abcourt pit 12 m and 19 m.
- Ramp gradient: 10-12 %;
- Density of ore: 3.0 t/m³;
- Density of waste: 2.8 t/m³;
- Slope in overburden: 2.5H:1V.

The underground resource of the Abcourt-Barvue deposit is found generally in the hanging wall of a marker tuff where ground conditions are good. The Avoca cut-and-fill method will be used for the underground production.

From three main declines, cross-cuts will be driven into the ore zone and lateral development will proceed on both sides to the limits of the lenses. Production will start at the bottom of the ore zone with sub-levels developed at 15 to 20 metre vertical intervals. All mining will be trackless.

Jumbos will be used for lateral development. The stopes will be mucked out with remote controlled LHD. Abcourt Mines owns several 8 yard3 and 5 yard3 scooptrams and one 4 yd3 scooptram. The 8 yard3 and 5 yard3 scoops will be used for mucking purposes while the 4 yard3 scoop will be used for servicing. The stopes will be drilled with pneumatic long hole machines. The main declines will be driven with a minus 12% to 15% slope.

Blasting operations will use ANFO explosives. A gel cartridge and nonel detonation system will be used for both development and production purposes. Trucks with 42 tonne loads will tram the ore to the surface.

Fresh air for underground mine ventilation purposes will be pushed through ventilation raises. Mine air will exhaust by the ramps. A manway will be installed in the ventilation raises and serve as a second egress.

The main declines, haulage drifts and access cross-cuts will be 5.5-m wide x 4.5-m high. The sub-drifts in ore will be 4.5-m high over the full width of the ore zone. Each stope will have an access cross-cut on each sub-level. The 1.5-m x 1.5-m slot raises will be drilled with a long hole machine.

The underground production will come from three Avoca cut-and-fill stopes which will be named «west stope», «central stope» and «east stope», and from mine development. The stopes extend over a distance of about 1 125 metres from 5010E on the Abcourt side to 135E on the Barvue side. All the planned ore tonnage is located west of the limit separating Barvue from Abcourt.

Mining will progress from the bottom up. The west and central stopes will start at a depth of about 150 metres and finish in the pit bottom at a depth of about 55 metres. The east stope will start at a depth of about 200 metres and will be completed at a depth of about 65 metres, also in pit bottom. Each stope will typically have two faces in ore, so it will be possible to alternate the drilling, blasting and mucking of ore cycle at one end of the stope with the filling cycle at the other end. The objective is to have a steady flow of muck from each stope.


Crushing and Grinding


Processing

  • Flotation

Flow Sheet: Subscription required

Summary:

The main process steps for treating the Abcourt and Barvue ores are primary crushing and stockpiling, ore bin, SAG/ball grinding, zinc flotation, and dewatering of a zinc concentrate by thickening and filtration. There is also a pyrite (or sulphide) concentrate produced as the last stage of differential flotation.

Barvue and Abcourt ores are mixed on outside stockpiles located near the crushing facilities. The ore is picked up and carried by a front end loader over a feed hopper equipped with an incline 750 mm (30”) square openings grizzly with the undersize dropping into a lined 75 t hopper. Mixing the ore will regulate the grade fed to the processing plant. The ore is extracted from the feed hopper by a pan vibrating feeder.

The jaw crusher discharges onto a 914 mm (36”) transfer belt conveyor. An electromagnet is located at the head of the transfer belt conveyor to remove tramp metal that might otherwise cause belt damage or block the SAG mill feed chute. T ........

Recoveries & Grades:

CommodityParameterAvg. LOM
Silver Recovery Rate, %  ......  Subscription required
Silver Head Grade, g/t 51.8
Silver Concentrate Grade, g/t  ......  Subscription required
Zinc Recovery Rate, %  ......  Subscription required
Zinc Head Grade, % 2.83
Zinc Concentrate Grade, %  ......  Subscription required
Subscription required - Subscription is required.

Projected Production:

CommodityProductUnitsAvg. AnnualLOM
Silver Payable metal oz 7,121,285
Silver Metal in concentrate oz 10,459,043
Zinc Concentrate kt  ......  Subscription required  ......  Subscription required
Zinc Payable metal M lbs  ......  Subscription required
Zinc Metal in concentrate M lbs  ......  Subscription required

Operational Metrics:

Metrics
Daily milling rate  ......  Subscription required
Stripping / waste ratio  ......  Subscription required
Daily milling capacity  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Tonnes milled, LOM  ......  Subscription required
Annual mining rate  ......  Subscription required
Annual milling rate  ......  Subscription required
* According to 2019 study.
Subscription required - Subscription is required.

Reserves at December 31, 2018:

CategoryOreTypeTonnage CommodityGrade
Proven In-Situ (OP) 6,180,510 t Silver 39.72 g/t
Proven In-Situ (UG) 1,169,662 t Silver 105.19 g/t
Proven Total 7,350,172 t Silver 50.14 g/t
Proven In-Situ (OP) 6,180,510 t Zinc 2.83 %
Proven In-Situ (UG) 1,169,662 t Zinc 2.87 %
Proven Total 7,350,172 t Zinc 2.84 %
Proven In-Situ (OP) 6,180,510 t Zinc Equivalent 3.61 %
Proven In-Situ (UG) 1,169,662 t Zinc Equivalent 4.93 %
Proven Total 7,350,172 t Zinc Equivalent 3.82 %
Probable In-Situ (OP) 408,851 t Silver 43.01 g/t
Probable In-Situ (UG) 315,139 t Silver 101.61 g/t
Probable Total 723,990 t Silver 68.52 g/t
Probable In-Situ (OP) 408,851 t Zinc 2.36 %
Probable In-Situ (UG) 315,139 t Zinc 3.23 %
Probable Total 723,990 t Zinc 2.74 %
Probable In-Situ (OP) 408,851 t Zinc Equivalent 3.2 %
Probable In-Situ (UG) 315,139 t Zinc Equivalent 5.22 %
Probable Total 723,990 t Zinc Equivalent 4.08 %
Proven & Probable In-Situ (OP) 6,589,361 t Silver 39.93 g/t
Proven & Probable In-Situ (UG) 1,484,801 t Silver 104.43 g/t
Proven & Probable Total 8,074,162 t Silver 51.79 g/t
Proven & Probable In-Situ (OP) 6,589,361 t Zinc 2.8 %
Proven & Probable In-Situ (UG) 1,484,801 t Zinc 2.95 %
Proven & Probable Total 8,074,162 t Zinc 2.83 %
Proven & Probable In-Situ (OP) 6,589,361 t Zinc Equivalent 3.58 %
Proven & Probable In-Situ (UG) 1,484,801 t Zinc Equivalent 4.99 %
Proven & Probable Total 8,074,162 t Zinc Equivalent 3.84 %

Commodity Production Costs:

CommodityUnitsAverage
Assumed price Zinc USD  ......  Subscription required *
Assumed price Silver USD  ......  Subscription required *
* According to 2019 study / presentation.
Subscription required - Subscription is required.

Operating Costs:

Units2019
OP mining costs ($/t mined) CAD 3.66 *
UG mining costs ($/t mined) CAD  ......  Subscription required
Combined mining costs ($/t mined) CAD  ......  Subscription required
Combined mining costs ($/t milled) CAD  ......  Subscription required
Processing costs ($/t milled) CAD  ......  Subscription required
Total operating costs ($/t milled) CAD  ......  Subscription required
* According to 2019 study.
Subscription required - Subscription is required.

2019 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Pre-Production capital costs $M CAD  ......  Subscription required
Sustaining CapEx $M CAD  ......  Subscription required
Total CapEx $M CAD  ......  Subscription required
OP/UG OpEx $M CAD  ......  Subscription required
Processing OpEx $M CAD 111.1
G&A costs $M CAD 22.6
Total OpEx $M CAD  ......  Subscription required
Income Taxes $M CAD  ......  Subscription required
Mining Taxes $M CAD  ......  Subscription required
Total Taxes $M CAD  ......  Subscription required
Gross revenue (LOM) $M CAD  ......  Subscription required
Net revenue (LOM) $M CAD  ......  Subscription required
EBITDA (LOM) $M CAD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M CAD  ......  Subscription required
After-tax Cash Flow (LOM) $M CAD  ......  Subscription required
Pre-tax NPV @ 5% $M CAD  ......  Subscription required
Pre-tax NPV @ 8% $M CAD  ......  Subscription required
After-tax NPV @ 5% $M CAD  ......  Subscription required
After-tax NPV @ 8% $M CAD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
Pre-tax payback period, years  ......  Subscription required
After-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.

Proposed Heavy Mobile Equipment as of January 15, 2019:
HME TypeSizeQuantity
Bulldozer 240 kW 1
....................... Subscription required ....................... Subscription required 2
....................... Subscription required ....................... Subscription required 1
....................... Subscription required 1
....................... Subscription required ....................... Subscription required 1
....................... Subscription required 1
....................... Subscription required ....................... Subscription required 2
....................... Subscription required ....................... Subscription required 1
....................... Subscription required ....................... Subscription required 5
....................... Subscription required ....................... Subscription required 3
....................... Subscription required 1
Subscription required - Subscription is required.

Mine Management:

Job TitleNamePhoneEmailProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 15, 2019
....................... Subscription required ....................... Subscription required Subscription required Jan 15, 2019
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Jan 29, 2021
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2019

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
Management Discussion & Analysis 2017
Management Discussion & Analysis 2016
Technical Report 2014
Feasibility Study Report 2007
Subscription required - Subscription is required.

News:

NewsDate
Additions to the Update on the Abcourt-Barvue Feasibility Study May 2, 2019
The Update on the Abcourt-Barvue Feasibility Study is Positive. A Major Reduction in the Initial Capital Cost is Expected February 8, 2019

Aerial view:

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