Canada

Rainy River Mine

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Overview

Mine TypeOpen Pit & Underground
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
  • Longitudinal retreat
  • Transverse stoping
  • Longhole open stoping
  • Cemented rockfill
  • Unconsolidated rockfill
Production Start... Lock
Mine Life2031
ShapshotUnderground mining Rainy River from the Intrepid Zone commenced in 2022 and underground mining is expected to ramp-up over the underground mine life with peak production from 2026 to 2028.

Owners

SourceSource
CompanyInterestOwnership
New Gold Inc. 100 % Indirect
New Gold currently has 100% interest in the Rainy River gold mine.

Contractors

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Deposit type

  • VMS
  • Vein / narrow vein

Summary:

The Rainy River deposit is an auriferous VMS system (Pelletier 2016) with a primary synvolcanic source and possibly a secondary syn-tectonic mineralization event (MercierLangevin et al. 2015).

Wartman (2011) and Pelletier (2016) have proposed that gold mineralization was introduced alongside base metals prior to the main deformation event at Rainy River, through fluid flow associated with a syn-volcanic hydrothermal system.

The peak hydrothermal activity and associated metal deposition is thought to have occurred during a volcanic activity hiatus during which fine-grained, pyrite-rich sediments were deposited on top of the dacitic volcanic rocks that host the ODM zone, and before the deposition of tholeiitic basalts in the uppermost part of the host succession.

An early, pre-D2 origin for the alteration and sulphide zones is further supported by the strong control of the combined S2 and L2 fabrics on the shape of the mineralized zones and lithological contacts.

At Rainy River, gold and silver are the dominant metals and the base metal (Cu-Pb-Zn) sulphides, although good indicators of the presence of gold, represent less than 10%, by volume, of the host rock. This is in contrast with other VMS systems that generally contain large amounts of base metals. However, there are exceptions, i.e., gold-rich VMS deposits that often contain modest amounts of base metals relative to gold (MercierLangevin et al. 2015 and references therein).

Deposit geology and mineralization
The Rainy River deposit comprises eight distinct zones of gold and silver mineralization. The bulk of the gold mineralization at Rainy River is contained in sulphide and quartzsulphide stringers and veins hosted by felsic quartz-phyric rocks.

ODM/17 Zone
The ODM/17 Zone is a series of east-west trending, south dipping lenticular sheets hosted within calc-alkaline dacites of the intermediate fragmental volcanic succession. The zone is cut by numerous NNE trending faults. The ODM/17 Zone has presently been defined over a strike extent of 1,600 m and to depths of 975 m. The true width of the zone is approximately 200 m. High grade lenses plunge south-west (aligned with the L2 stretching lineation). Mineralization in the ODM/17 Zone is open below the modelled depth.

Three styles of gold mineralization are observed in the ODM/17 Zone. Low grade intervals are characterized by tightly folded pyrite stringer veins and disseminated pyrite in sericite-quartz-chlorite altered host rocks. Moderate-grade intervals are characterized by tightly folded and foliation parallel pyrite-sphalerite and pyrite stringer veins, commonly associated with stronger silica and weak garnet alteration. High grade gold mineralization is associated with deformed quartz-pyrite-gold veinlets that overprint other mineralization styles.

433 Zone
The 433 Zone is located approximately 500 m north of the ODM/17 Zone and hosted within strongly sericitized calc alkaline dacite rocks and lesser tholeiitic basalts. The 433 Zone comprises a cigar-shaped lens which plunges steeply south-west. This zone has a strike length of 325 m, a vertical distance of approximately 820 m, and a true width of up to 125 m.

Footwall Silver Zone
The Footwall Silver Zone occurs in altered dacitic tuffs and tuff breccias immediately adjacent to a high strain zone at the northern contact of the ODM/17 Zone. This zone plunges to the south-west in similar orientation to the ODM/17 Zone. It is hosted by centimetre scale sulphide-bearing quartz veinlets with common millimetre scale fracture filling to dendritic native silver inclusions. Sulphides contained within these veinlets, in order of frequency, comprise pyrite, sphalerite, chalcopyrite, and galena. Localized spessartine garnets have been noted.

HS Zones
Several subsidiary zones of gold mineralization occur between the ODM/17 Zone and 433 Zone.

The HS Zones comprise a series of small, discontinuous south-west plunging, flattened shoots of mineralization. Discontinuous, irregular low-grade gold mineralization is associated with chlorite-pyrite replacement of matrix in flattened, albitized, heterolithic pebble conglomerates. The zone has a strike length of 200 m and extends to a vertical distance of approximately 700 m. The full extent of the HS Zone has not been defined by drilling to date.

The Western Zone
The Western Zone occurs near surface approximately 500 m north-west of the western extent of the ODM/17 Zone. It is composed of stockwork of discrete centimetre scale anastomosing, folded to linear quartz and quartz-carbonate veinlets.

The Western Zone comprises a series of discontinuous 5 to 10 m wide zones of mineralization which strike approximately south-east and dip south-west at approximately 50°. Individual zones encompass a strike length of between 50 and 500 m. Collectively these zones occur over an area of approximately 500 x 1,200 m. They have been defined to down-dip depths of approximately 60 to 500 m.

The CAP
Zone The CAP Zone is located approximately 200 m to the south of the ODM/17 Zone in both tholeiitic basalts and calc-alkaline dacite of the upper diverse mafic volcanic succession. The CAP Zone has been defined over a strike length of 400 m, up to 120 m wide and with a down-dip extent of 750 m. Mineralization in the CAP Zone is open below the modelled depth.
Intrepid Zone
The Intrepid Zone is located approximately 800 m east of the ODM/17 Zone within dacitic tuffs and breccias of the intermediate fragmental volcanic succession. The Intrepid Zone has been defined over a strike length of 410 m and to 450 m down-dip. The width of the zone is variable ranging between 10 m to 60 m.

34 Zone
The 34 Zone comprises magmatic nickel copper sulphide mineralization associated with precious metals (gold, platinum group metals) within a tubular, ~100 m thick, late-stage pyroxenite gabbro intrusion which cross cuts the ODM/17 Zone and post-dates the main gold mineralization event. The host pyroxenite-gabbro intrusion is unmetamorphosed, but locally altered into serpentine and talc. Magmatic sulphides vary from massive to nettextured and disseminated. Gold and silver mineralization occur within 5 to 50 m thick dislocated (and therefor discontinuous) north-east oriented pods over a strike length of 500 m with a down-dip plunge of 100 m.

Reserves

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Mining Methods

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Comminution

Crushers and Mills

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Processing

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Production

CommodityUnits2023202220212020201920182017Avg. Annual (Projected)LOM (Projected)
Gold koz 000000000000000000227292433,402
Gold Equivalent oz 000000000000000000000000000000000000230,349
Silver koz 000000000000200404296,004
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.

Operational metrics

Metrics202320222021202020192018
Daily milling rate 000000000000000000000000017,934 t
Daily mining rate 000000000000000000000000108,392 t
Daily ore mining rate 0000000000000000000033,687 t
Daily waste mining rate 0000000000000000000000
Waste 0000000000000000000027,267 kt
Ore tonnes mined 00000000000000000012,296 kt
Tonnes milled 00000000000000006,546 kt
Daily milling capacity 0000021,000 t
^ Guidance / Forecast.

Production Costs

CommodityUnits202320222021202020192018
Cash costs (sold) Gold Equivalent USD 000 000 000 000 910 / oz  
Cash costs Gold USD
Cash costs (sold) Gold USD 820 / oz  
Total cash costs Silver USD 10.3 / oz  
Total cash costs Gold USD 826 / oz  
All-in sustaining costs (sold) Gold Equivalent USD 0000 0000 0000 0000 1,630 / oz  
All-in sustaining costs (AISC) Silver USD 18.6 / oz  
All-in sustaining costs (AISC) Gold USD 1,498 / oz  
All-in sustaining costs (sold) Gold USD 1,501 / oz  
^ Guidance / Forecast.
Net of By-Product.

Operating Costs

Currency202220212020
OP mining costs ($/t mined) USD 3.93  2.92  2.48  
Processing costs ($/t milled) USD  ....  Subscribe  ....  Subscribe  ....  Subscribe
G&A ($/t milled) USD  ....  Subscribe  ....  Subscribe  ....  Subscribe

Financials

Units2023202220212020201920182017
Capital expenditures (planned) M USD  ....  Subscribe
Growth Capital M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe
Sustaining costs M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 142.1   2.6  
Capital expenditures M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 170.6   499.3  
Revenue M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 274.4   34.3  
Operating Income M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe -820.9   -288.9  
Pre-tax Income M USD -811.6   -278.4  
After-tax Income M USD -851.2   -192.4  

Heavy Mobile Equipment

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Personnel

Mine Management

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Job TitleNameProfileRef. Date
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EmployeesContractorsTotal WorkforceYear
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Aerial view:

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