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Canada
777 Mine (Manitoba Operation)

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 Location:
Flin Flon, Manitoba, Canada

  Regional Office:
Suite 800 - 25 York Street
Toronto
Ontario, Canada
M5J2V5
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Overview

StatusClosing / Closed
Mine TypeUnderground
Commodities
  • Copper
  • Zinc
  • Gold
  • Silver
Mining Method
  • Longhole stoping
  • Longitudinal retreat
  • Backfill
Production Start...
Mine Life2022
On June 22, 2022, Hudbay Minerals Inc. announced that mining activities at the company’s 777 mine in Flin Flon, Manitoba, have concluded after the reserves were depleted following 18 years of steady production. Closure activities at the 777 mine have commenced and employees and equipment are transitioning to the company’s operations in Snow Lake, Manitoba.


Owners

Source: p. 15
CompanyInterestOwnership
Hudbay Minerals Inc. 100 % Direct
The 777 mine is owned 100% by Hudbay Minerals Inc.

Contractors

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Deposit Type

  • VMS


Summary:

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 withi ........


Mining Methods

  • Longhole stoping
  • Longitudinal retreat
  • Backfill


Summary:

The 777 mine is a multi-lens orebody with shaft access down to the 1508 metre level. The mine consists of an internal ramp that provides access to each mining level. Mobile tired diesel equipment is utilized. Load haul dump (“LHD”) units vary from 6.1m3 to 7.6m3 . Trucks are 40 to 50 ton units feeding an ore pass system or direct to rock-breakers which feed an underground crusher and ore is skipped to surface via the shaft.

Long-hole open stope is the mining method used at the 777 mine. Mine sequencing involves primary, secondary, chevron and longitudinal retreat stopes that are either paste or unconsolidated loose waste rock backfilled. Long-hole stopes are mined at 15 metre to 17 metre vertical sill to sill intervals. Stope strike lengths are generally 16 metres with widths of 2 to 100 metres, with an average of approximately 20 metres. The ore is undercut at the top and bottom of the block, providing access for drilling and mucking.

Drilling is done by top hammer long-hole drills with holes varying in length between 10 metres and 20 metres long and a hole diameter of 3 inches. Mucking is accomplished by remote LHD units and then loaded to haul trucks.

Ore at 777 mine is loaded by LHDs to underground haul trucks, which dump to a series of ore passes that feed three chutes on 1412 metre level. Haul trucks are loaded from the chutes and haul the ore directly to the main ore pass system on 1412 metre level. The ore is temporarily stored in a ........


Crushing and Grinding


Processing

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Summary:

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Production:

CommodityProductUnits2021202020192018201720162015
Copper Metal in concentrate t  ......  Subscription required  ......  Subscription required*  ......  Subscription required*24,947*31,488*35,422*35,831*
Copper Concentrate kt  ......  Subscription required  ......  Subscription required*  ......  Subscription required*108*132*149*152*
Zinc Metal in concentrate t  ......  Subscription required  ......  Subscription required*  ......  Subscription required*  ......  Subscription required*  ......  Subscription required*  ......  Subscription required*  ......  Subscription required*
Zinc Concentrate kt  ......  Subscription required  ......  Subscription required*  ......  Subscription required*  ......  Subscription required*  ......  Subscription required*  ......  Subscription required*  ......  Subscription required*
Gold Metal in concentrate oz  ......  Subscription required  ......  Subscription required*
Silver Metal in concentrate oz  ......  Subscription required  ......  Subscription required*
Gold Equivalent Metal in concentrate oz  ......  Subscription required*  ......  Subscription required*  ......  Subscription required*  ......  Subscription required*  ......  Subscription required*  ......  Subscription required*
* Combined production for 777 Mine and Lalor Mine
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Operational Metrics:

Metrics202120202019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required1,109,782 t966,567 t1,014,369 t1,297,829 t
Daily mining rate  ......  Subscription required  ......  Subscription required3,000 t
Daily milling rate  ......  Subscription required  ......  Subscription required4,390 t4,800 t
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Reserves at January 1, 2022:

CategoryTonnage CommodityGrade
Proven 459,000 t Copper 1.24 %
Proven 459,000 t Zinc 5.01 %
Proven 459,000 t Gold 1.78 g/t
Proven 459,000 t Silver 32 g/t

Operating Costs:

Units2021202020192018201720162015
UG mining costs ($/t milled) CAD 91.179.97980.668.552.360.3



Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 15, 2022
....................... Subscription required ....................... Subscription required Subscription required Mar 29, 2022
....................... Subscription required ....................... Subscription required Subscription required May 15, 2022
....................... Subscription required ....................... Subscription required Subscription required May 15, 2022
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Corporate Presentation 2018
Management Discussion & Analysis 2018
Management Discussion & Analysis 2017
Annual Information Form 2016
Corporate Presentation 2016
Corporate Presentation 2016
Management Discussion & Analysis 2016
Annual Information Form 2015
Management Discussion & Analysis 2015
Technical Report 2012
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