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Canada
Yellowknife Project

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 Location:
85 km N from Yellowknife, Northwest Territories, Canada

  Project Contacts:
401-675 W. Hastings St.
Vancouver
British Columbia, Canada
V6B 1N2
Phone  ...  Subscription required
Fax(604) 681-2879
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageFeasibility
Mine TypeOpen Pit & Underground
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
  • Longhole stoping
  • Cemented backfill
Processing
  • Gravity separation
  • Flotation
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life15 years (as of Jan 1, 2012)
GoldMining Inc. initiated a preliminary economic assessment ("PEA") on the Yellowknife Project. The Company currently expects the study to be completed in the second half of 2021.
Latest NewsGoldMining Completes US$20 Million Non-Dilutive Facility with Bank of Montreal     October 29, 2021


Owners

Source:
CompanyInterestOwnership
Tyhee NWT Corp 100 % Direct
GoldMining Inc. 100 % Indirect
GoldMining has acquired a 100% interest in Tyhee's Yellowknife Gold Project.

Deposit Type

  • Breccia pipe / Stockwork
  • Orogenic
  • Vein / narrow vein


Summary:

The YGP deposits can be considered Archean Lode Gold deposits within an orogenic gold environment. These deposit types are well documented throughout the Canadian Shield. Gold deposition typically post-dates peak metamorphism and can be accompanied by retrograde metamorphism in the greenschist to amphibolite grade lithologies. Favorable structural settings include areas of contrasting lithological competency which result in brittle and ductile shearing as well as quartz-carbonate veining as stockwork and lode gold quartz veining.

The Ormsby and Bruce Zone deposits are interpreted to be an amphibolite facies disseminated-replacement hypothermal to mesothermal Archean lode gold style deposit hosted by brecciated mafic metavolcanics. Metasomatic layering has resulted in very irregular banded to laminated textures with bands of alternating amphibolite, biotite and plagioclase pseudo-gneiss with abundant garnet. The two zones are located in the Ormsby and Discovery metavolcanic members respectively.

Gold is found associated with fine grained lamination parallel pyrrhotite bands within silicified amphibolite and within irregularsmoky grey quartz veins. Sulfide mineralization includes arsenopyrite, pyrite and trace amounts of galena, sphalerite and chalcopyrite. Visible gold occurs as isolated grains proximal to sulfide clots in quartz veins or alone in quartz veins. Similar gold mineralization has been intersected in diamond drill core over the 2.5 km extent of the Ormsby and Discovery Member amphibolites.

Quartz veining is an important but minor component by volume of the mineralized zones. Silicification occurs as discrete, discontinuous light to dark gray quartz veins, pods, or disseminations. The quartz veins, usually only a few centimeters in width, have variable orientations typically striking 320º to 340º azimuth and dipping 10º to 50º to the southwest. Lesser veinlets dip to the northeast suggesting an asymmetric conjugate pair.

The Ormsby Zone generally strikes 0350 (+/- 150) and dips vertically. The Ormsby Zone varies from
75 to 150 m wide, has a strike length of approximately 1,300 m and is open at the current explored depth of 550 m below surface.

The Nicholas Lake Zone gold deposit is nterpreted to be an intrusion hosted shear zone deposit comprised of multiple auriferous sulfide bearing quartz veins and veinlets located within the granodiorite or within the Burwash sediments in close proximity of the granodiorite. The quartz veins are generally vertical but can dip as much as 80° to the north or south.

The Nicholas Lake Zone is approximately 125 m wide, has a strike length of 225 m and is open at the current explored depth of 450 m below surface. The zone trends approximately east-west and is sinusoidal in shape both vertically and horizontally.

The Goodwin Lake Zone deposit is interpreted to be a brittle shear zone quartz vein stockwork lode gold deposit within a gabbro. Vein widths on surface are generally <1.5 m but have been seen over 2 m with lengths of 10 to 15 m and locally >35 m. Quartz veins, typically a light smoky grey to blue grey to near white in color, are generally irregular in shape with sinuous and local boudinaged forms. Vein orientations vary greatly from flat to vertical and locally folded. Dips where indicated suggest north-northeast dips with more common strikes at 115° to 125° east o north and 10° to 20° east of north. Gangue minerals are minor amounts of chlorite, amphibole and biotite with weak carbonate.

Gold mineralization is seen principally within quartz veins and to a much lesser extent at vein contacts and thin halos. Gold appears to be essentially free in nature and occurs as very fine grained to local fine grained <1 mm blebs along vein fractures and contacts with sulfide or chlorite mineralization.

The Clan Lake Main Zone deposit is interpreted to be a brittle shear zone quartz vein stockwork lode gold deposit within intermediate volcanic flows and related tuff. Vein measurements indicate a great variation in strike and dip. Vein widths on surface are generally <1.0 m and some over 2 m with lengths of 8 to 12 m and locally >25 m. In core, veining can be seen as 5 cm to 3 m wide irregular veins with upper and lower contacts at sometimes at differing angles. Contacts are sharp with locally a very weakly foliated margin where semi-pervasive sericite alteration is noted. Gangue minerals are typically minor amounts of chlorite, amphibole and biotite with weak carbonate.

The quartz veins occur with moderate to abundant sericitization and silicification of vein haloes. Gold is found within smoky grey to grey-white quartz-carbonate veins, quartz breccias zones and within the vein alteration haloes. Gold occurs as very fine grained to local fine grained <1 mm blebs along vein fractures and contacts with sulfide or chlorite mineralization. The presence of visible gold is common with many gold assay results greater than 10 g/t. Pyrrhotite and arsenopyrite are the most abundant sulfides from trace to 12% with pyrite, galena and trace sphalerite and chalcopyrite. Arsenopyrite is a common halo component and replaces pyrrhotite locally. The Main Zone, open to depth and horizontally, currently measures 1,200 m long by 200 m wide with a north-west to southeast trend.


Mining Methods

  • Truck & Shovel / Loader
  • Longhole stoping
  • Cemented backfill


Summary:

Mining will be a combination of traditional open pit truck and shovel operations at Ormsby, Bruce
Lake and Clan Lake, combined with underground operations at Nicholas Lake and Ormsby.

The orebody at Nicholas Lake is found in near vertical veins, which can be mined using a longhole stoping method. The mining thickness will range from 2 to 24 m wide, with an average of 4 m wide. Sill heights have been established at 20 m, which gives an open hangingwall of 23 m using a 3 m instope mining height. The length of stopes have been established using an allowable hydraulic radius (open stope area divided by perimeter) that depends on the rock quality and using an empirical design method. If the stopes were to remain open after mining, then sill pillars and dip pillars would be required to prevent collapse of the hangingwall, but at the planned depths of 20 to 290 m, significant ore would be left unmined. To minimize the remnant ore left unmined, backfilling stopes will reduce or eliminate the need for pillars.

Both operations will incorporate longhole stope mining methods using conventional drill and blast and cemented rock fill (CRF) for both mines.


Crushing and Grinding


Processing

  • Gravity separation
  • Flotation
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Source: Subscription required

Summary:

Metallurgical test programs have demonstrated that there is a considerable amount of gold in the ore that can be recovered by gravity separation. In addition, these programs demonstrated that froth flotation would recover a very high percentage of the remaining gold contained in the gravity tailing, and that gold could be easily leached from flotation concentrates with the use of cyanide. These factors, plus the plant location and other external factors, led to the development of a flowsheet consisting of conventional three-stage crushing, followed by ball mill ore grinding with gravity recovery of coarse gold, rougher flotation, regrinding of the rougher flotation concentrate, cleaner flotation, CIL cyanide extraction of gold from the cleaner flotation concentrate and the SO2/air process for cyanide detoxification of the leach residue.

The concentrator has been designed to process 4,000 tpd in two parallel, equal capacity (2,000 t/d) processing lines from fine ore storage, ........

Recoveries & Grades:

CommodityParameterAvg. LOM
Gold Recovery Rate, % 90.5
Gold Head Grade, g/t 2.03

Projected Production:

CommodityUnitsLOM
Gold koz 1,207

* According to 2012 study.

Reserves at August 21, 2012:

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 20,433 kt Gold 2.03 g/t 1,334 koz
Measured & Indicated 27,115 kt Gold 1.97 g/t 1,715 koz
Inferred 5,774 kt Gold 2.62 g/t 487 koz

Commodity Production Costs:

CommodityUnits2021
Cash costs Gold USD 853.86 / oz *
Assumed price Gold USD 1,400 / oz *
* According to 2012 study / presentation.
Subscription required - Subscription is required.

Operating Costs:

Units2021
UG mining costs ($/t mined) USD 5.54 *
OP mining costs ($/t mined) USD  ......  Subscription required
Processing costs ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2012 study.
Subscription required - Subscription is required.

2012 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
OP OpEx $M USD  ......  Subscription required
UG OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 435.3
G&A costs $M USD 89.3
Total OpEx $M USD  ......  Subscription required
Gross revenue (LOM) $M USD  ......  Subscription required
Net revenue (LOM) $M USD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M USD  ......  Subscription required
After-tax Cash Flow (LOM) $M USD  ......  Subscription required
Pre-tax NPV @ 5% $M USD  ......  Subscription required
After-tax NPV @ 5% $M USD  ......  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 August 21, 2012:
HME TypeModelQuantity
Dozer ....................... Subscription required ....................... Subscription required
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Mine Management:

Job TitleNameRef. Date
....................... Subscription required ....................... Subscription required Sep 7, 2018
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Technical Report 2012
Subscription required - Subscription is required.

News:

NewsDate
GoldMining Completes US$20 Million Non-Dilutive Facility with Bank of Montreal October 29, 2021
GoldMining Announces US$20 Million non-dilutive Facility with Bank of Montreal October 21, 2021
GoldMining Receives Water Licence and Land Use Permits and Files Technical Report for the Yellowknife Gold Project, Northwest Territories, Canada April 17, 2019
GoldMining Announces Resource Estimate for the Yellowknife Gold Project, Northwest Territories, Canada March 4, 2019

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