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Canada
Renard Mine

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 Location:
493 km N from Saguenay, Quebec, Canada

  Regional Office:
168 Main Street, Suite 103
Mistissini
Quebec, Canada
G0W 1C0
Phone  ...  Subscription required
Fax+1-418-748-1116
WebsiteWeb
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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 & Underground
Commodities
  • Diamond
Mining Method
  • Truck & Shovel / Loader
  • Blast Hole Stoping
Processing
  • Dense media separation
  • Magnetic separation
  • X-Ray sorting
  • Ultra-violet sorting
Mine Life14 years (as of Jan 1, 2019)
The Renard diamond mine, operated by Stornoway Diamonds Canada Inc. (“Stornoway”), restarted operations in September 2020 following an extended care and maintenance period related to COVID-19.

Stornoway has not published 2019 and 2020 annual reports by the time it was delisted from TSX in September 2019.
Latest NewsOsisko Announces Preliminary Q4 2020 Sales and Provides Royalty & Stream Portfolio Update     January 13, 2021


Owners

Source: p. 47
CompanyInterestOwnership
Stornoway Diamonds Corp. 100 % Indirect
Stornoway Diamonds Corp. has a 100% interest in the Renard Diamond Mine through its wholly-owned subsidiary, Stornoway Diamonds (Canada) Inc. (SDCI).

Since Stornoway went bankrupt, Deloitte was appointed as trustee. Stornoway got delisted from TSX (since September 2019).

Deposit Type

  • Kimberlite


Summary:

The Renard kimberlites were emplaced into granitic and gneissic host rocks, and contain diamonds of economic interest. The bodies comprise a late Neo-Proterozoic to Cambrian kimberlite field in Québec (Girard, 2001; Moorhead et al., 2002; Letendre et al., 2003).

To date, nine kimberlite pipes have been identified over a 2 km2 area in the Renard Cluster (Renard 1 to Renard 10; with Renard 5 and Renard 6 forming one body, referred to as Renard 65). The kimberlite pipes are typically spaced between 50 m and 500 m from each other. Geophysical data and drill information from delineation and bulk sampling programs indicate that, in general, most of the Renard kimberlites are irregular and elliptical in plan view. Surface areas of the kimberlite portion of the pipes range from 0.1 ha to 2.0 ha. Two laterally extensive kimberlite dyke systems, known as the Lynx and Hibou dykes, have been identified to the west and northwest of the pipe cluster, respectively (Figure 7.3). Portions of both dykes are included in the mineral resource estimation. Additional dyke like kimberlites have been discovered elsewhere on the property. These are not included in the mineral resource estimation but may warrant additional work at a later date.


Mining Methods

  • Truck & Shovel / Loader
  • Blast Hole Stoping


Summary:

A mine plan has been developed to extract the Indicated Mineral Resources of the Renard Project. The Renard 2 and Renard 3 kimberlite pipes will be mined through a combination of open pit and underground mining methods, whereas the Renard 65 kimberlite pipe will be mined by open pit mining method only and the Renard 4 pipe will be mined by underground method only. Open pit and underground Mineral Reserves were estimated independently based on criteria specific to each method.

The Renard 2 and Renard 3 open pit excavations result in a single pit at surface with two pit bottoms centered on the respective orebodies. The excavation is therefore treated as a single pit and is referred to as the R2/R3 OP.

The underground mine will be developed while mining the R2/R3 OP, and following its depletion, the underground mine will be extended to surface through the pit floor.

Waste rock from the open pit will be placed into the Renard 2 and Renard 3 underground stopes via the open pit to provide support for the stope walls during mining. Waste Waste material to support the Renard 4 underground stopes will be backfilled through backfill raises from surface.

Four underground mining methods were shortlisted and evaluated, including blasthole shrinkage (BHS), sublevel retreat (SLR), long hole panel mining with backfill (LHP), and blasthole shrinkage with pillars (BHSP). Based on this study, the blasthole shrinkage (BHS) mining method was selected to mine the underground portions of the Renard 2, Renard 3 and Renard 4 kimberlite pipes.

The BHS method consists of drilling and blasting the ore with long large-diameter blastholes, and extracting the ore at the base of the stopes from drawpoints. During the blasting phase, ore is left in the stope to support the walls until the complete stope has been blasted. Since ore expands when blasted due to the voids in the broken rock, it is necessary to draw out this swell on an ongoing basis, approximately 35% of the total in situ ore. Thus, with this method, there is a continual supply of ore production throughout the blasting period, and once the blasting is complete, the remaining broken ore can be drawn from the stope – generally at a very high rate with few restrictions.

With the BHS method, the kimberlite in a panel is blasted in successive vertical lifts over the height of the panels, in a benching fashion. One or two slot raises will be excavated over the height of the stope to provide initial free faces from which to initiate the blasting. These slot raises will be excavated during the drilling phase using a “Machine Roger” ITH drill head attached to an ITH drill rig. While the panel is being blasted, sufficient blasted ore will be left in the stope (shrinkage) to provide support to the walls and limit the extent of sloughing or caving from the back if that should be experienced.

The blasting and production phase will start by blasting the undercut drawcones from the drawpoint level and advance in a retreat blasting and mucking sequence. After each blast, sufficient ore will be drawn (mucked out) to provide for a free face and ample void before proceeding with the next blast. The blasting strategy will be to blast out the drawcones below each panel before beginning the blasting of the downholes.

The downholes are typically 60 m long, drilled from the drill level above. Blasting will be done by vertical benching, initiated towards a central slot raise, in vertical lifts. Following each blast, the blasted ore will be mucked out from the drawpoints below, until the void or gap at the top of the blasted ore to the back is sufficient for choke blasting the next lift. During the blasting phase, 35% of the ore will be drawn from the stope through drawpoints to accommodate the swell of broken ore.

Once the crown pillar of the North panel of the 290 mining zone is blasted, the Renard 2 pipe will be open to surface and, at this point, production mucking in this panel can be ramped up to the full production rate. As blasting of the other panels progresses towards the South, the opening in the pit bottom will get bigger until the crown pillar of the last panel is blasted.

As the blasting inside the South panels of 290 Lis nearing completion, the blasting sequence can progress in the North panels of the 470L. The mass blasting of the 470L mining zone residual pillar (pillar below the 290L drawpoint level) will include not only the pillar, but also the underside of the drawpoint troughs on the 290L. Detailed modelling will confirm the thickness of the pillar to be kept in situ between the above mucking horizons and the blasted stope below. Mucking directly above the panel will have to be completed before the sill/crown pillar of the panel below can be removed. After this blast, the drawpoints on 290L will have been destroyed and mucking from the North panel on 470L can be ramped up to full production. This sequence will be repeated for each individual panel as mining progresses towards the South on this level. The blasting sequence on 590L and 710L will be the same as on 470L.


Crushing and Grinding
Flow Sheet: Source


Processing

  • Dense media separation
  • Magnetic separation
  • X-Ray sorting
  • Ultra-violet sorting

Flow Sheet: Subscription required

Summary:

The process plant design capacity is 2,160,000 tpa (dry solids basis). The plant overall utilization is estimated to be 78%, equivalent to an operating time of 6,833 hours per year or 315 tph and 6,000 tpd. Stornoway expects to increase the plant throughput to 323 tph, already within initial plant equipment capacity, and increase the plant availability to 83.5% by optimizing plant maintenance sequences. Once the plant achieves sustainable nameplate throughput, further optimization work will be conducted focusing on liberation, diamond breakage and increasing the overall plant utilization. The ore processing system will liberate, concentrate and recover diamonds from 45 mm to 1mm. Taking the above into consideration by July 2018, Stornoway expects the plant will operate at a throughput of 7,000tpd at an overall plant utilization of 83,5%.

The ore processing system will liberate, concentrate and recover diamonds from 45 mm to 1mm.

Once the plant achieves sustainable ........

Recoveries & Grades:

CommodityParameter201820172016
Diamond Head Grade, carats/t 0.570.841.12

Production:

CommodityUnits2019201820172016
Diamond k carats  ......  Subscription required ^1,3241,643449
All production numbers are expressed as mineral. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics2019201820172016
Tonnes processed 2.4 Mt ^2,328,300 t1,956,436 t399,162 t
Ore tonnes mined 2,115,522 t2,228,273 t2,074,827 t
Total tonnes mined 4,475,854 t7,840,130 t
Daily milling capacity 6,000 t6,000 t
Plant annual capacity 2.16 Mt
^ Guidance / Forecast.

Reserves at December 31, 2018:

CategoryOreTypeTonnage CommodityGradeContained carats
Proven Stockpiles 1,903 kt Diamond 0.269 carats/t 513 carats
Probable In-Situ (OP) 2,609 kt Diamond 0.255 carats/t 665 carats
Probable In-Situ (UG) 21,061 kt Diamond 0.812 carats/t 17,106 carats
Proven & Probable Total 25,074 kt Diamond 0.715 carats/t 18,284 carats

Commodity Production Costs:

CommodityUnits20182017
Cash costs Diamond CAD 100.4 / carat 53.6 / carat

Operating Costs:

Units20182017
Total operating costs ($/t milled) CAD 57.145

Financials:

Units201920182017
Capital expenditures (planned) M CAD  ......  Subscription required
Capital expenditures M CAD 88.2   126.9  
Revenue M CAD 165.5   196.5  
Gross profit M CAD -61.7   47.3  
Pre-tax Income M CAD -258.1   -143.3  
EBITDA M CAD -7.9   85  
Operating Cash Flow M CAD 7   65.9  


Proposed Heavy Mobile Equipment as of March 30, 2016:
HME TypeModelSizeQuantity
Backhoe ....................... Subscription required ....................... Subscription required
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Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 29, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 29, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 29, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 29, 2021
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
Corporate Presentation 2018
Financial Review 2018
Management Discussion & Analysis 2018
Press Release 2018
Corporate Presentation 2017
Financial Review 2017
Management Discussion & Analysis 2017
Press Release 2017
Annual Information Form 2016
Corporate Presentation 2016
Management Discussion & Analysis 2016
Technical Report 2016
Management Discussion & Analysis 2015
Feasibility Study Report 2013
Subscription required - Subscription is required.

News:

NewsDate
Osisko Announces Preliminary Q4 2020 Sales and Provides Royalty & Stream Portfolio Update January 13, 2021
Osisko Provides Update on the Stornoway Renard Mine September 14, 2020
Stornoway Extends Care and Maintenance Period at Renard Diamond Mine April 14, 2020
Stornoway Files for Creditor Protection Under the CCAA September 9, 2019
Clarification From Stornoway. The Renard Mine continues in operation April 12, 2019
Stornoway Announces Appointment of Vice President, Operations January 28, 2019

Aerial view:

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