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French Guiana
Montagne d'Or Project

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 Location:
181 k W from Cayenne, French Guiana

  Project Contacts:
1 rue de l’Indigoterie – Immeuble Chopin
Rémire-Montjoly
French Guiana
97354
Phone  ...  Subscription required
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StagePermitting
Mine TypeOpen Pit
Commodities
  • Gold
  • Silver
  • Copper
Mining Method
  • Truck & Shovel / Loader
Processing
  • Gravity separation
  • Inline Leach Reactor (ILR)
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Carbon adsorption-desorption-recovery (ADR)
  • AARL elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life12 years (as of Jan 1, 2017)
Project modifications underway to submit permit applications in mid-2020.
Latest NewsOrea Announces that Court Orders the French Government to Renew the Montagne d'Or Mining Concessions     December 31, 2020


Owners & OPERATOR

Source: p. 7, 13
CompanyInterestOwnership
Orea Mining Corp. 44.99 % Indirect
Nord Gold N.V. (operator) 55.01 % Indirect
Orea Mining Corp. owns 44.99%; Nordgold owns 55.01% and is a project operator.

Deposit Type

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


Summary:

The current interpretation is that Montagne d’Or is a deformed volcanogenic massive sulphide deposit (Ross 2014).

The Montagne d’Or prospect consists of a family of tabular mineralized bodies that form closelyspaced sub-parallel east-northeast (084°) striking and steeply (72°) south-dipping mineralized zones. Mineralization has been encountered over a strike length of more than 2,500 m and to a vertical depth of at least 200 m. Only a small portion of the gold mineralization has been subjected to upper level oxidation. The significant fine-grained gold mineralization is principally affiliated with sulphide veins and masses within fresh country rock that begins at shallow depths.

Two significant styles of gold mineralization have been recognized although they show a gradational relationship between each other:

-SMS with gold mineralization
-Sulphides in disseminated stringers with gold mineralization

SMS was a term coined by previous operators and was used to support a “VMS” type model for the mineralization. It is characterized by a high sulphide content (>20%) and occurs over intervals ranging from tens of centimetres to up to 4 m. This mineralization was later interpreted to represent zones of thicker, deformed and transposed sulphide ± quartz-rich veins and a denser distribution of disseminated sulphide as compared to that of the disseminated type.

The SMS also includes sulphide-rich breccia dykes, which host rolled and milled clasts of host rock within a ductily deformed pyrite-chalcopyrite-pyrrhotite matrix. In addition, bornite is present, and minor amounts of arsenopyrite have been identified petrographically. There is a clear correlation between sulphide veinlets and sulphide-rich breccia zones and high gold grades.

Mineralization is hosted by felsic, mafic and intercalated mafic/felsic rocks to varying degrees. However, approximately 80% of the gold mineralization in the deposit occurs within the more felsic units, mainly the Felsic tuff unit.

The mineralization appears as elongated lenses of higher grade material within broader zones of low grade but anomalous mineralization (0.25 g/t Au to 0.4 g/t Au). Several distinct anomalous mineralized domains are recognized, separated by barren intercalated mafic and felsic rocks.

The Montagne d’Or deposit is now thought to be part of a stratiform/stratabound deposit type. Mineralization consists of pyrite, pyrrhotite and chalcopyrite with minor sphalerite, magnetite and arsenopyrite. Arsenopyrite, although observed, does not appear to have an obvious relationship with either gold or copper mineralization. Distinct phases are reported as stratiform disseminated sulphides, stockwork sulphide veinlets and layers of semi-massive sulphides that are tectonically transposed. The latter facies is considered as syn-volcanic in origin and as the most favourable occurrence for gold mineralization.

The disseminated sulphide veins could be related to feeder zones and/or remobilized on fold hinges and shear zones. In addition, evidence is found for tectonic remobilization with sulphides concentrated within fold hinges and pressure shadows, and cross-cutting sulphide-bearing veins.

Visible gold occurs in chlorite-rich zones or is spatially related to sulphide mineralization (after Giraud, Tremblay, Jébrak and Lefrançois, 2014). This particular 1 m interval ran 80.75 g/t Au. There is generally an increase in gold grades as sulphide (excluding pyrrhotite) content increases. Microscopic studies indicate that gold occurs as very fine grains in the host rock groundmass and at the junctions of quartz crystals. Gold has only very rarely been seen as inclusions within sulphide minerals.


Mining Methods

  • Truck & Shovel / Loader


Summary:

This Feasibility study assumed that open pit mining methods will use front-end loaders (FELs) and hydraulic excavators to load haul trucks for waste and ore haulage. Mining activities will include site clearing, removal of growth medium (topsoil), free-digging, drilling, blasting, loading, hauling and mining support activities. Material within the pit will be generally blasted on a 5 m high bench. Most of the saprolite material (approximately 18% of the total material to be mined) can be loaded directly with hydraulic excavators without the need for blasting. Most ore will be sent directly to the primary crusher. The stripped waste material will be placed in dumps to the north of the pit, and lower-grade ore placed in a stockpile, near the primary crusher location.


Crushing and Grinding


Processing

  • Gravity separation
  • Inline Leach Reactor (ILR)
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Carbon adsorption-desorption-recovery (ADR)
  • AARL elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The treatment plant design incorporates the following unit process operations:

-Primary jaw crushing to produce a coarse crushed product;

-A crushed ore surge bin with bin overflow conveyed to a dead stockpile. Ore will be reclaimed from the dead stockpile to feed the milling circuit when the crushing circuit is offline;

-A single stage semi-autogenous grinding circuit with recycle crushing (SS SAC) circuit with a 14 MW SAG mill in closed circuit with a pebble crusher and hydrocyclones to produce an 80% passing 75 micron grind size;

-Gravity concentration and removal of coarse gold from the milling circuit recirculating load and treatment of gravity concentrate by intensive cyanidation and electrowinning to recover gold to doré;

-Pre-leach thickening to increase the slurry density feeding the (CIL) circuit to minimize CIL tankage, smooth out fluctuations in the milling circuit, improve slurry mixing characteristics and reduce overa ........

Recoveries & Grades:

CommodityParameterAvg. LOM
Gold Recovery Rate, %  ......  Subscription required
Gold Head Grade, g/t 1.58
Subscription required - Subscription is required.

Projected Production:

CommodityUnitsAvg. AnnualLOM
Gold koz 2142,572
All production numbers are expressed as metal in doré.

Operational Metrics:

Metrics
Stripping / waste ratio  ......  Subscription required
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Total tonnes mined, LOM  ......  Subscription required
Plant annual capacity  ......  Subscription required
Tonnes processed, LOM  ......  Subscription required
Annual processing rate  ......  Subscription required
* According to 2017 study.

Reserves at December 31, 2017:

CategoryTonnage CommodityGradeContained Metal
Proven 8,246 kt Gold 1.99 g/t 527 koz
Probable 45,868 kt Gold 1.5 g/t 2,218 koz
Proven & Probable 54,114 kt Gold 1.58 g/t 2,745 koz
Measured 10,327 kt Gold 1.8 g/t 600 koz
Indicated 74,817 kt Gold 1.35 g/t 3,247 koz
Measured & Indicated 85,146 kt Gold 1.41 g/t 3,847 koz
Inferred 20,202 kt Gold 1.48 g/t 963 koz
Total Resource 105,348 kt Gold 1.42 g/t 4,810 koz

Commodity Production Costs:

CommodityUnitsAverage
Cash costs Gold USD 606 / oz *
All-in sustaining costs (AISC) Gold USD 779 / oz *
Assumed price Gold USD 1,250 / oz *
* According to 2017 study / presentation.

Operating Costs:

Units2017
OP mining costs ($/t mined) USD 2.44 *
OP mining costs ($/t milled) USD  ......  Subscription required
Processing costs ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2017 study.
Subscription required - Subscription is required.

2017 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
Processing OpEx $M USD 621.8
G&A costs $M USD 224.3
Total OpEx $M USD  ......  Subscription required
Income Taxes $M USD  ......  Subscription required
Royalty payments $M USD  ......  Subscription required
Gross revenue (LOM) $M USD  ......  Subscription required
Operating margin (LOM) $M USD  ......  Subscription required
EBITDA (LOM) $M USD  ......  Subscription required
Net Income (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 April 28, 2017:
HME TypeModelSizeQuantity
Backhoe ....................... Subscription required 102 kW 1
....................... Subscription required ....................... Subscription required ....................... Subscription required 2
....................... Subscription required ....................... Subscription required 1
....................... Subscription required ....................... Subscription required ....................... Subscription required 4
....................... Subscription required ....................... Subscription required ....................... Subscription required 2
....................... Subscription required ....................... Subscription required ....................... Subscription required 4
....................... Subscription required ....................... Subscription required ....................... Subscription required 2
....................... Subscription required ....................... Subscription required ....................... Subscription required 2
....................... Subscription required ....................... Subscription required ....................... Subscription required 3
....................... Subscription required ....................... Subscription required ....................... Subscription required 4
....................... Subscription required ....................... Subscription required ....................... Subscription required 1
....................... Subscription required ....................... Subscription required ....................... Subscription required 1
....................... Subscription required ....................... Subscription required ....................... Subscription required 9
....................... Subscription required ....................... Subscription required ....................... Subscription required 17
....................... Subscription required ....................... Subscription required ....................... Subscription required 3
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 29, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2018
................................... Subscription required 2018
Feasibility Study Report 2017
Subscription required - Subscription is required.

News:

NewsDate
Orea Announces that Court Orders the French Government to Renew the Montagne d'Or Mining Concessions December 31, 2020
Orea Provides Update on the Status of the Montagne d'Or Gold Project, French Guiana, France October 8, 2020
Cyanide Processing Authorised for Use at a Mine Site in French Guiana December 3, 2019
Columbus Provides Mine Permitting Update on Montagne d’Or Gold Project in French Guiana August 13, 2019
Columbus Gold and Nordgold Declare their Official Intention to Move Forward with the Montagne d’Or Gold Mine Development November 27, 2018
Columbus Gold Provides Permitting Update for Montagne d'Or Gold Project May 8, 2018

Subscription required - Subscription is required.

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