Canada

Seabee Gold Operation

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Categories

Overview

Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Avoca
  • Transverse stoping
  • Alimak
  • Longitudinal retreat
  • Cemented rockfill
  • Unconsolidated rockfill
Production Start... Lock
Mine Life2028
ShapshotThe Seabee Gold Operation (SGO) is accessible by fixed-wing aircraft from the towns of LaRonge, Prince Albert, and Saskatoon, and during the winter months, typically January through the end of March, a 60 kilometers winter road is also built between the mine site and Brabant Lake, approximately 120 kilometers north of La Ronge.

Ore is currently produced from the Santoy underground mine from a ramp access/surface portal and is hauled 14 kilometers to the mill located at the Seabee site. A second underground mine was operated from 1991–2018 at Seabee.

Current exploration programs are focused on new reserve growth at both Santoy and the Gap Hangingwall targets. In addition, the company is continuing to advance analysis and permitting to potentially support future mining at the Porky/Porky West area.
Related Asset

Owners

SourceSource
CompanyInterestOwnership
SGO Mining Inc. (operator) 100 % Direct
SSR Mining Inc. 100 % Indirect
SSR Mining holds a 100% interest in the property through its wholly-owned subsidiary, SGO Mining Inc., which also acts as operator for Seabee Gold Operation (SGO).

Contractors

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Deposit type

  • Vein / narrow vein
  • Mesothermal

Summary:

Northern Saskatchewan forms part of the Churchill Province of the Canadian Shield and has been subdivided into a series of litho-structural crustal units. The Seabee Gold Operation (SGO) is located within the Glennie domain of the Proterozoic Trans-Hudson Orogen. All the main gold deposits at SGO are considered orogenic quartz-vein hosted lode gold deposits.

Delaney (1992) suggested that lithological heterogeneities between feldspar porphyry dikes and gabbros of the Laonil Lake intrusive complex are responsible for the localization and propagation of the shear zone. At Seabee, the structures trend between 045° and 085°, and dip north near vertically. Three discrete subsets of structures have been recognized trending at 070°, 085°, and 045°, with the 070° structures containing the auriferous veins. At Santoy, the structures trend between 340° to 315°, and dip moderately to the east. Vein geometry within the shear zones is commonly a combination of ‘S’ and ‘Z’ oblique and extensional types, and second order or Riedel shears.

Gold deposits in the SGO can be broadly assigned to three main geological domains:

• Santoy Mine Complex (SMC): The SMC is hosted in a sequence of Assemblage A mafic volcano-sedimentary rocks variably intruded by ca. 1875 Ma granodioritic rocks along an approximately 15 km roughly north–south trending sinistral to sinistral-reverse shear zone. The SMC occurs in an approximately 3 km long interpreted dilatant jog along this structure and is spatially associated with the ca. 1875 Ma Lizard Lake pluton.
• Laonil Lake Intrusive Complex: The historical Seabee and 5-1 mines occur along a series of conjugate shear zones within a coarsely layered ultramafic to mafic intrusion dominated by medium-grained, mesocratic gabbro.
• Porky: The Porky deposit area is a mineralized trend located near the nose of the Ray Lake synform, a 12 km long tightly folded and sheared contact separating siliciclastic rocks of the Porky Lake Group to the north from volcanic rocks to the south.

Gold mineralization at the Santoy mine complex is hosted within the Santoy Shear Zone (SSZ); a kilometer-scale shear zone with a roughly north-south strike that dips moderately to steeply to the east. Economic concentrations of gold occur in two main settings within this structure. The first, and historically most significant source of ore, is within dilatant portions of the SSZ. Mineralization in this setting is typified by diopside-albite +/- titanite altered, variably deformed, mafic volcanic rocks with sheeted and massive quartz veining up to 30 m wide with 2% to 10% sulphides (pyrite > pyrrhotite> chalcopyrite) +/- coarse visible gold. This style of mineralization is the dominant style of the Santoy 7, 8A/B, and 9 Veins. The second setting for gold mineralization in the SMC is within apophyses, and along the margin, of the Lizard Lake Pluton (LLP), which is a granodiorite intrusion deformed by the SSZ. Mineralization in this setting follows foliation parallel fracturing and, most significantly, the plunge of axial traces of secondary folding where competency contrast during deformation allowed for the formation of larger scale (1 m to 10 m) fracture networks to trap mineralizing fluids. Significant mineralization within the LLP is typified by highly silicified, variably albite altered and quartz veined granodiorite with 2% to 5% sulphides (pyrrhotite > pyrite > chalcopyrite). A greenish hue, interpreted to be an alteration of albite, tends to accompany the highest gold grades in this mineralization setting. This mineralization is typical of the GHW, SHW, and Santoy 8F mineralization.

Gold mineralization at the Porky deposits occurs along the western margin of the Ray Lake synform within a kilometre scale shear zone, the Pine Lake Shear Zone (PLSZ), that strikes east-southeast and dips moderately to the south. Gold mineralization at the Porky deposits is hosted in two distinct settings. The gold mineralization of greatest economic significance is hosted in 2 m to 20 m wide sheeted quartz veins with 2% to 10% sulphides +/- coarse visible gold (arsenopyrite > pyrite > pyrrhotite > chalcopyrite) within the metasedimentary rocks of the Porky Lake Group either immediately at the contact with the mafic volcanics above or, more prominently, footwall to a conglomerate unit usually 20 m to 60 m from the mafic-sediment contact. The best developed veining appears to correlate with the intersection of the axial planes of large (hundreds of metres) scale folding within the Porky Lake Group and the PLSZ. The second setting for gold mineralization is within broad (5 m to 60 m wide) intervals of deformed, calc-silicate altered, and locally sulphide rich (5% to 20% sulphide; pyrrhotite > pyrite > chalcopyrite +/- arsenopyrite and visible gold) mafic volcanic rocks. This setting tends to exhibit a lower gold grade than the veining internal to the sediments.

Gold mineralization in the now-closed Seabee Mine occurs in sub-vertical, roughly east-west striking, interconnected shear structures internal to a mixed unit of gabbro and quartz-feldspar dikes named the Laonil Lake intrusive complex. Gold mineralization is hosted dominantly in quartz veining with 2% to 7% sulphide (pyrite > pyrrhotite > chalcopyrite) +/- tourmaline, carbonate, and coarse visible gold. While the Seabee Mine is now closed, a number of subparallel structures to the ones which hosted the former mine have indications of economic mineralization in historic sampling.

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

CommodityUnits2024202320222021202020192018
Gold koz 0000000000000000096
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.

Operational metrics

Metrics202320222021202020192018
Daily milling rate 000000000000000000001,125 t
Daily milling capacity 00000000
Ore tonnes mined 000000000000
Waste 000000000000
Total tonnes mined 000000000000
Tonnes milled 000000000000000000000000351,999 t

Production Costs

CommodityUnits2024202320222021202020192018
Cash costs (sold) Gold USD 00000000 0000000 0000000 0000000 0000000 464 / oz   505 / oz  
All-in sustaining costs (sold) Gold USD 00000000 00000000 0000000 0000000 0000000 812 / oz   755 / oz  
^ Guidance / Forecast.
Net of By-Product.

Operating Costs

Currency2019201820172016
UG mining costs ($/t mined) USD 56  56  68  65  
Processing costs ($/t milled) USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe

Financials

Units2024202320222021202020192018
Capital expenditures (planned) M USD  ....  Subscribe
Sustaining costs M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 7.1  
Capital expenditures M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 7.1  
Revenue M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 115.7  
Operating Income M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 20.7  
Pre-tax Income M USD  ....  Subscribe  ....  Subscribe 20.2  
Earnings M CAD
Book Value M USD  ....  Subscribe  ....  Subscribe

Heavy Mobile Equipment

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Personnel

Mine Management

Source Source
Job TitleNameProfileRef. Date
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EmployeesContractorsTotal WorkforceYear
Subscription required 2023
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Subscription required Subscription required Subscription required 2020

Aerial view:

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