Mining Intelligence and News

Barry Mine

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Mine TypeOpen Pit
  • Gold
Mining Method
  • Truck & Shovel / Loader
Mine Life... Lock
SnapshotOn June 13, 2022, Bonterra Resources Inc. released the highlights on an independent preliminary economic assessment (“PEA”) on the Barry open pit project in the Urban-Barry Camp in northern Quebec.

Open pit outlines the fastest and cheapest potential production re-start.


Bonterra Resources Inc. 100 % Indirect
Bonterra acquired the Properties by virtue of a court-approved plan of arrangement completed on September 4, 2018, whereby Bonterra acquired all the issued and outstanding common shares of Metanor Resources Inc. (Metanor).

On January 1, 2020, the Company amalgamated the parent Company with its wholly owned subsidiary Metanor Resources Inc.



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Deposit type

  • Vein / narrow vein


The Properties are thought to be prospective for greenstone-hosted quartz carbonate vein gold deposits, intrusion related gold (IRGS) deposits, and volcanogenic massive sulphide (VMS) deposits (Darling and Lafontaine (2011), SGS (2019b)). The deposits at the Properties for which Mineral Resources have been estimated are characterized as Greenstone-hosted quartz carbonate veins typical of the northern portion of the Abitibi Subprovince of the Superior Province in northwestern Québec.

The Barry property is underlain by greenschist facies volcanic and intrusive rocks of tholeiitic affinity belonging to the UBGB. As there is limited outcrop exposure, the geology had to be deduced from drill holes data and geophysics. Geological mapping and diamond drilling identified a series of basaltic flows that are interpreted to cover over 90% of the Barry property. The only intrusive bodies identified on the Barry property were the quartz-feldspar porphyry in the area of the Barry I Main Zone Area and a series of gabbro sills to the north. A siltstone outcrop was identified approximately 300 m northeast of the Barry I Main Zone. Stratigraphic tops are to the southeast, as indicated by pillow facing directions. The rocks on the Barry property are overprinted by a weak to moderate northeast to southwest trending foliation (S2) that parallels regional shearing and contacts of the large granitic intrusions.

Mafic volcanic rocks are the most common rocks on the Barry property and consist of dark green, fine grained, iron-rich tholeiitic basalts. In order of decreasing abundance, these flows vary from massive, amygdaloidal, brecciated, feldspar-phyric, to locally pillow. Alteration varies from a regional chlorite alteration to carbonate, sericite, epidote plus minor silicification, hematization, biotite and actinolite alteration locally (Tessier 1996, Lariviere 1997). All these rocks vary from generally nonmagnetic to locally strongly magnetic with up to 5% disseminated magnetite crystals and less commonly stringers of magnetite.

Mafic volcanic rocks in the area of the Barry deposit are intruded by a series of porphyritic to granitic felsic dikes or sills. The quartz-feldspar porphyry varies in colour from a medium grey (fresh surface), to a reddish tint (due to hematization), to a bleached light grey (due to strong silicification). The quartzfeldspar porphyry is noted to be sill like, maintaining a general stratigraphic position within the volcanic pile, while simultaneously crosscutting the volcanic stratigraphy on surface. The thickness of this unit varies from several metres to over 125 m.

One can observe two sets of porphyritic to granitic felsic dikes or sills. The first set is foliated and exhibits 35% of feldspars and less than 5% of blue quartz-eyes. The second set of quartz-feldspar porphyry is not foliated and contains 8% to 12% of blue quartz-eyes and 50% of feldspars.

The gabbro is massive, medium to coarse grained with a dark green colour. At times, the gabbro develops a finer grained gradational contact with the basalts and varies from moderately to nonmagnetic. Drilling indicates that the gabbro is sill like and up to 20 m thick.

Gold mineralization is constrained to zones containing 5% to 15% albite-carbonate-quartz veins and their associated hydrothermally altered wall rocks (SGS, 2019a). Albite-carbonate-quartz veins are typically one centimetre to five centimetres wide, and comprise euhedral albite, carbonate, and quartz with local trace biotite ± sericite, chlorite, pyrite (fine grained anhedral, or coarse grained euhedral), pyrrhotite, rare euhedral magnetite, and fine grained visible gold as inclusions or fracture infill in pyrite, or in sharp contact with carbonate crystals in the vein. Veins locally pinch and swell or are boudinaged with biotite generally filling the cusps. Gold grades in mineralized veins and altered mafic volcanic rocks range from less than 2 g/t Au to more than 100 g/t Au.

The following alteration types have been observed on the Barry property:

• Syn-ore carbonate-quartz-pyrite alteration associated with the mineralized albite-carbonatequartz veins.
• Syn-ore biotite-calcite alteration associated with mineralized albite-carbonate-quartz veins in areas of intense foliation.
• Post-ore biotite-chlorite, carbonate, muscovite, and epidote alteration. Post-ore epidote alteration is generally found at depths greater than 25 m, where it is commonly associated with epidote-garnet veinlets, or in non-mineralized zones at shallower depths.



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CommodityProductUnitsAvg. AnnualLOM
Gold Payable metal oz 143,599
Gold Metal in doré oz 30,000145,050

Operational metrics

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* According to 2022 study.

Production Costs

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* According to 2022 study / presentation.

Operating Costs

OP mining costs ($/t mined) CAD 5.31 *  
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* According to 2022 study.

Project Costs

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OP OpEx $M CAD  ......  Subscribe
Processing OpEx $M CAD 38.5
Refining and transportation $M CAD  ......  Subscribe
Transportation (haulage) costs $M CAD 32.3
G&A costs $M CAD 24.9
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Mine Management

Job TitleNameProfileRef. Date
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