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Canada
Dumont Project

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 Location:
25 km W from Amos, Quebec, Canada

  Project Contacts:
42 Rue Trudel
Amos
Quebec, Canada
J9T 4N1
Phone  ...  Subscription required
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Overview

StagePermitting
Mine TypeOpen Pit
Commodities
  • Nickel
  • Cobalt
  • Palladium
  • Platinum
Mining Method
  • Truck & Shovel / Loader
Processing
  • Flotation
  • Magnetic separation
Mine Life30 years (as of Jan 1, 2019)
Latest NewsRNC Minerals Files Dumont Nickel-Cobalt Project Updated Feasibility Study     July 11, 2019


Owners

Source:
CompanyInterestOwnership
RNC Minerals 28 % Indirect
RNC's principal assets are 100% ownership of the producing Beta Hunt gold mine in Western Australia and a 28% stake in the JV that owns the Dumont Nickel Project

Deposit Type

  • VMS
  • Magmatic


Summary:

Magmatic nickel-copper-platinum group element (PGE) deposits occur as sulphide concentrations associated with a variety of mafic and ultramafic magmatic rocks. The magmas originate in the upper mantle, and an immiscible sulphide phase occasionally separates from the magma as a result of the processes occurring during emplacement into the crust. The sulphide phase generally partitions and concentrates nickel, copper and PGE elements from the surrounding magma. The heavy sulphide droplets once concentrated and separated from the magma tend to sink towards the base of the magma, and form concentrated pockets or layers of sulphides that crystallize upon cooling to form mineral deposits.

Nickel-bearing sulphides and a nickel-iron alloy are enriched (grades > 0.35% nickel) in stratiform bands within the dunite subzone and are also broadly disseminated at lower concentrations throughout the dunite and lower peridotite subzones. The number and thickness of these bands varies from place to place in the deposit. Nickel sulphide and alloy concentrations decrease gradationally away from the centre of these bands toward the interband zones where mineralization continues at lower concentrations. The total nickel contained in these rocks occurs in variable proportions in sulphides, alloy and silicates depending on primary magmatic nickel mineralogy and the degree of serpentinization of the rock.

Disseminated nickel mineralization is characterized by disseminated blebs of pentlandite ((Ni,Fe)9S8), heazlewoodite (Ni3S2), and the ferronickel alloy, awaruite (Ni2.5Fe), occurring in various proportions throughout the sill. These minerals can occur together as coarse agglomerates, predominantly associated with magnetite, up to 10,000 µm (10 mm), or as individual disseminated grains ranging from 2 to 1,000 µm (0.002 to 1 mm). Nickel can also occur in the crystal structure of several silicate minerals including olivine and serpentine.

Mineralized zones containing pentlandite, awaruite, and heazlewoodite, are classified into the following mineralization assemblages; sulphide dominant, alloy dominant and mixed.

The sulphide mineralization assemblage occurs in higher-grade bands (grades > 0.35% nickel) that are subparallel to the dip of, and principally in the centre of, the sill. Sulphide mineralization is dominated by pentlandite (Pn) and/or heazlewoodite (Hz) with lesser awaruite (Aw). Pentlandite and heazlewoodite occur as medium to coarse-grained blebs occupying intercumulus spaces in a primary magmatic texture, sometime exhibiting secondary overgrows within magnetic blebs. These blebs are often intimately associated with magnetite ± brucite ± chromite ± awaruite, in intercumulus spaces. Where awaruite is present with sulphides, it often observed to be a secondary overgrowth on pentlandite within the primarily textures intercumulus magnetite blebs. Up to three sulphide bands are found within the dunite where it is the thickest in the central southeast region of the sill.

The alloy mineralization assemblage is characterized by the presence of awaruite with little to no sulphides. Awaruite occurs as fine grains (generally <1 mm) associated with small intercumulus magnetite or chromite blebs. Awaruite can also be observed as a secondary overgrowth on serpentine within the pseudomorphed grain. Alloy mineralization zones occur where primary sulphides are not present and serpentinization is near complete.

The mixed mineralization assemblage typically represents a transition from sulphide to alloy or sulphide (pentlandite) to sulphide (heazlewoodite) mineralization. The mixed mineralization assemblage contains varying amounts of sulphide (pentlandite and heazlewoodite) along with similar quantities of awaruite. Mineralization can occur as coarse sulphide-magnetite blebs associated with awaruite or as finely disseminated discrete grains.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Dumont pit will ultimately measure approximately 4.9 km along strike, 1.4 km at the widest point and reach a maximum depth of 520 m below surface. A total of 2,080 Mt of material will be excavated, using large surface mining equipment that will operate at high production rates.

Multiple fleets of load and haul equipment will be employed to ensure the various rock types at Dumont will be mined most productively. Areas where the clay thickness exceeds 7.5 m will be stripped using 90 t and 150 t backhoe excavators while the remaining areas where mining will be conducted on a nominal 5 m bench height will be stripped using 300 t excavators in face shovel configuration. All three of the smaller excavators will be diesel powered and they will load a combined 7% of the 2,080 Mt expit tonnage, or 6% of the total tonnage that includes a further 511 Mt reclaimed from stockpiles. The 600 t excavators, which will operate predominantly on 10 m benches as well as the stockpiles, will be electrically powered and load 22% of the total tonnage. The remaining 72% of total material will be loaded by rope shovels, operating predominantly on 15 m benches and the stockpiles.


Processing Technologies

  • Flotation
  • Magnetic separation

Flow Sheet: Source

Summary:

The process plant and associated service facilities will process ore delivered to primary crushers to produce nickel concentrate and tailings. The proposed process encompasses crushing and grinding of the run-of-mine (ROM) ore, desliming via a hydrocyclone circuit, slimes rougher flotation, slimes cleaner flotation, nickel sulphide rougher flotation, nickel sulphide cleaning flotation, magnetic recovery of sulphide rougher and cleaner tailings, regrinding of magnetic concentrate and an awaruite recovery circuit (consisting of rougher and cleaner flotation stages).

Concentrate will be thickened, filtered and stockpiled on site prior to being loaded onto railcars for transport to third-party concentrate processing. Coarse and slime tailings will be thickened in dedicated thickeners prior to deposition in the TSF.

The process plant will be built in two phases. Initially, the plant will be designed to process 52.5 kt/d with allowances for a duplicate process expansion to increase plant capacity to 105 kt/d. Common facilities will include concentrate thickening and handling and sulphuric acid off-loading and containment.

Recoveries & Grades:

CommodityParameterAvg. LOM
Nickel Recovery Rate, % 43.2
Nickel Head Grade, %  ......  Subscription required
Subscription required - Subscription is required.

Projected Production:

CommodityProductUnitsLOM
Nickel Metal in concentrate M lbs 2,625
Nickel Payable metal M lbs 2,402
Cobalt Metal in concentrate M lbs  ......  Subscription required
Palladium Metal in concentrate koz  ......  Subscription required
Platinum Metal in concentrate koz  ......  Subscription required

Operational Metrics:

Metrics
Stripping / waste ratio  ......  Subscription required1.13
Ore tonnes mined, LOM  ......  Subscription required1,179 Mt
Total tonnes mined, LOM  ......  Subscription required2,514 Mt
Tonnes milled, LOM  ......  Subscription required1,179 Mt
Daily milling rate  ......  Subscription required105 kt *
Daily mining rate  ......  Subscription required375 kt *
* According to 2019 study.
Subscription required - Subscription is required.

Reserves at May 30, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 163,140 kt Nickel 0.33 % 1,174 M lbs
Proven 163,140 kt Cobalt 114 ppm 41 M lbs
Proven 163,140 kt Palladium 0.031 g/t 162 koz
Proven 163,140 kt Platinum 0.013 g/t 67 koz
Probable 864,908 kt Nickel 0.26 % 4,908 M lbs
Probable 864,908 kt Cobalt 106 ppm 202 M lbs
Probable 864,908 kt Palladium 0.017 g/t 466 koz
Probable 864,908 kt Platinum 0.008 g/t 220 koz
Proven & Probable 1,028,048 kt Nickel 0.27 % 6,082 M lbs
Proven & Probable 1,028,048 kt Cobalt 107 ppm 243 M lbs
Proven & Probable 1,028,048 kt Palladium 0.019 g/t 627 koz
Proven & Probable 1,028,048 kt Platinum 0.009 g/t 287 koz
Measured 372,100 kt Nickel 0.28 % 2,310 M lbs
Measured 372,100 kt Cobalt 112 ppm 92 M lbs
Measured 372,100 kt Palladium 0.024 g/t 288 koz
Measured 372,100 kt Platinum 0.011 g/t 126 koz
Indicated 1,293,500 kt Nickel 0.26 % 7,441 M lbs
Indicated 1,293,500 kt Cobalt 106 ppm 302 M lbs
Indicated 1,293,500 kt Palladium 0.017 g/t 720 koz
Indicated 1,293,500 kt Platinum 0.008 g/t 335 koz
Measured & Indicated 1,665,600 kt Nickel 0.27 % 9,750 M lbs
Measured & Indicated 1,665,600 kt Cobalt 107 ppm 394 M lbs
Measured & Indicated 1,665,600 kt Palladium 0.02 g/t 1,008 koz
Measured & Indicated 1,665,600 kt Platinum 0.009 g/t 461 koz
Inferred 499,800 kt Nickel 0.26 % 2,862 M lbs
Inferred 499,800 kt Cobalt 101 ppm 112 M lbs
Inferred 499,800 kt Palladium 0.014 g/t 220 koz
Inferred 499,800 kt Platinum 0.006 g/t 92 koz

Commodity Production Costs:

CommodityUnitsAverageAverage
Credits (by-product) Nickel CAD -0.53 / lb *
Total cash costs Nickel USD  ......  Subscription required *
All-in sustaining costs (AISC) Nickel USD  ......  Subscription required *
C1 cash costs Nickel USD  ......  Subscription required * 5.32 / lb *
C1 cash costs Nickel CAD 4.31 / lb *†
Assumed price Palladium USD  ......  Subscription required *
Assumed price Platinum USD  ......  Subscription required *
Assumed price Cobalt USD  ......  Subscription required *
Assumed price Nickel USD  ......  Subscription required *
* According to 2013 study / presentation.
† Net of By-Product.
Subscription required - 'Investor' subscription is required.

Operating Costs:

Units20192013
OP mining costs ($/t mined) CAD 1.68 *
OP mining costs ($/t milled) CAD  ......  Subscription required
Processing costs ($/t milled) CAD  ......  Subscription required  ......  Subscription required
* According to 2013 study.
Subscription required - 'Investor' subscription is required.

2019 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M CAD 1,357
Initial CapEx $M CAD 1,268
Sustaining CapEx $M CAD  ......  Subscription required
Sustaining CapEx $M CAD  ......  Subscription required
Total CapEx $M CAD  ......  Subscription required
Total CapEx $M CAD  ......  Subscription required
OP OpEx $M CAD 4,192
OP OpEx $M CAD 4,581
Processing OpEx $M USD 4,009
Processing OpEx $M CAD 5,631
G&A costs $M USD 419
G&A costs $M CAD 616
Total OpEx $M USD  ......  Subscription required
Total OpEx $M CAD  ......  Subscription required
Gross revenue (LOM) $M USD  ......  Subscription required
Gross revenue (LOM) $M CAD  ......  Subscription required
Pre-tax Cash Flow (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 @ 8% $M USD  ......  Subscription required
Pre-tax NPV @ 8% $M CAD  ......  Subscription required
After-tax NPV @ 8% $M USD  ......  Subscription required
After-tax NPV @ 8% $M CAD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
Subscription required - 'Investor' subscription is required.

Proposed Heavy Mobile Equipment:
HME TypeModelSizeQuantityRef. Date
Dozer ....................... Subscription required 8 cu. m 4 Jul 25, 2013
....................... Subscription required ....................... Subscription required ....................... Subscription required 3 May 30, 2019
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....................... Subscription required ....................... Subscription required ....................... Subscription required 3 Jul 25, 2013
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....................... Subscription required ....................... Subscription required ....................... Subscription required 1 Jul 25, 2013
....................... Subscription required ....................... Subscription required ....................... Subscription required 4 Jul 25, 2013
....................... Subscription required ....................... Subscription required ....................... Subscription required 3 May 30, 2019
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....................... Subscription required ....................... Subscription required ....................... Subscription required 16 Jul 25, 2013
....................... Subscription required ....................... Subscription required ....................... Subscription required 56 Jul 25, 2013
....................... Subscription required ....................... Subscription required ....................... Subscription required 3 May 30, 2019
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 26, 2019
Subscription required - Subscription is required.

Staff:

EmployeesContractorsYear
Subscription required Subscription required 2019

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
Feasibility Study Report 2013
Other 2013
Technical Report 2013
Subscription required - Subscription is required.

News:

NewsDate
RNC Minerals Files Dumont Nickel-Cobalt Project Updated Feasibility Study July 11, 2019
RNC Minerals Announces Positive Results of Dumont Nickel-Cobalt Project Updated Feasibility Study May 30, 2019

Subscription required - Subscription is required.

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