777 Mine

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Mine TypeUnderground
  • Copper
  • Zinc
  • Gold
  • Silver
Mining Method
  • Longhole stoping
  • Longitudinal retreat
  • Undefined backfill
Production Start... Lock
ShapshotThe 777 mine was closed on schedule, in June 2022, after 18 years of steady production. The Company’s hydrometallurgical zinc facility in Flin Flon was also closed after more than 25 years of successful operations. Hudbay is committed to strong and safe closure practices and has considered stringent and detailed environmental plans to manage water and the remaining infrastructure and processing plants in Flin Flon.

Hudbay transitioned personnel and equipment from Flin Flon to Snow Lake following the closure of the 777 mine in June 2022.
Related AssetManitoba (Snow Lake) Operation


Hudbay Minerals Inc. 100 % Indirect
The 777 mine is owned 100% by Hudbay Minerals Inc.



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Deposit type

  • VMS


The 777 deposit lies in the western portion of the Paleoproterozoic Flin Flon Greenstone Belt.

The Flin Flon formation is subdivided into three mappable members containing units of heterolithic and monolithic breccias, rhyolite flows and domes, and massive and pillowed basalt flows and flow-top breccias. It is comprised of the Millrock member, which contains the 777 and Callinan mineralization, and in footwall to it the Blue Lagoon and Club members.

A complex succession of felsic and basalt-dominated heterolithic volcaniclastic rocks host the Flin Flon Main, Callinan and 777 VMS deposits within the Greenstone Belt. The north-trending, VMS-hosting, 30 to 700 metre thick volcanic/volcaniclastic succession is recognized for at least 5 kilometres along strike and has an average dip of 60°E. The volcaniclastic rocks have been interpreted to occupy a volcano-tectonic depression within a basaltic footwall succession.

The 777 and Callinan deposits occur within an east-facing sequence of volcanic rocks documented as tholeiitic and basalt-dominated, and dated around 1888 Ma. The rocks immediately hosting the mineralization, however, consist of quartz-phyric (“QP”) and quartzfeldspar-phyric rhyolite flows and quartz-feldspar crystal-lithic volcaniclastic rocks of rhyolitic composition.

The 777 deposit can be divided into two main southeast plunging trends, the North Limb and the South Limb, as well as the West Zone. All three zones lie within the same stratigraphic sequence with the same lithofacies. The West Zone lies in the footwall in what is interpreted to be a lower thrust slice and both limbs have the same stratigraphic sequence. On average the lenses strike at 010° and dip to the east at 45°. All zones have a relatively shallow plunge trending at -35° towards 140°. Horizontal widths throughout the deposit range from 2.5 metres to 70 metres in thickness, and can be thicker when two or more zones overlap.

Mineralization is generally medium to coarse grained disseminated to solid sulphides consisting of pyrite, chalcopyrite, sphalerite, pyrrhotite, and magnetite. The principle gangue minerals are chlorite and quartz. Alteration minerals include biotite, epidote and actinolite.



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Mining Methods


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Crushers and Mills

Milling equipment has not been reported.



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Ore mined at our Manitoba operations during the fourth quarter of 2022 was 46% lower than the same period in 2021 mainly due to the planned closure of 777 in June 2022.
Copper Metal in concentrate t 000000000000000000024,947*31,488*35,422*
Copper Concentrate kt 00000000108*132*149*
Zinc Metal in concentrate t 0000000000000000000044,415*56,128*39,504*
Zinc Concentrate kt 0000000089*109*77*
Gold Metal in concentrate oz 000000000000000
Silver Metal in concentrate oz 000000000000000000
Gold Equivalent Metal in concentrate oz 000000000057,227*62,357*50,861*
* Combined production for 777 Mine and Lalor Mine

Operational metrics

Ore tonnes mined 00000000000000000000000000966,567 t1,014,369 t
Daily mining rate 000000000000
Daily milling rate 4,390 t

Production Costs

Commodity production costs have not been reported.

Operating Costs

UG mining costs ($/t milled) CAD 87.5  91.1  79.9  79  80.6  68.5  52.3  

Heavy Mobile Equipment

Fleet data has not been reported.


Mine Management

Source Source
Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 15, 2024
....................... Subscription required ....................... Subscription required Subscription required Apr 15, 2024
....................... Subscription required ....................... Subscription required Subscription required Apr 15, 2024

Aerial view:


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