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Canada
Caribou Mine

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 Location:
48 km W from Bathurst, New Brunswick, Canada

  Address:
9361 Rte 180 Hwy
Bathurst
New Brunswick, Canada
E2A 3Z1
Phone506-545-6097
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Sales
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StatusTemporary Suspension
Mine TypeUnderground
Commodities
  • Zinc
  • Lead
  • Silver
  • Gold
  • Copper
Mining Method
  • Avoca
Shaft Depth 590 m
Processing
  • Flotation
Mine Life6 years (as of Jan 1, 2018)
The mine has been on a care and maintenance program since March 2020.

With the implementation of several operational and commercial enhancements, as well as improved zinc market conditions, the Company expects to return to mining in early February 2021, with first payable zinc production expected by the end of March 2021.
Latest NewsTrevali to Restart Caribou Mine with Improved Economics; Continues Studies on Longer Term Value Potential     January 15, 2021


Owners & OPERATOR

 
CompanyInterestOwnership
Trevali Mining Corp. 100 % Indirect
Trevali Mining (New Brunswick) Ltd. (operator) 100 % Direct

Deposit Type

  • VMS
  • Volcanic hosted

Source: Source p.42-44

Summary:

The Caribou deposit is a volcanic hosted massive sulphide deposit (VMS) typical of the The Bathurst Mining Camp (BMC).

The Caribou deposit consists of the following units from the base upward:
(1) dark gray to black carbonaceous shale, pale gray phyllite, graywacke, and chloritic schist interbedded with hydrothermally altered pale green felsic volcanic rocks (footwall of the deposit);
(2) stringer sulfides cutting hydrothermally altered sedimentary and felsic volcanic rocks; (3) massive sulfides comprising a vent complex and bedded sulfides;
(4) chloritic schist at the contact between massivesulfides and overlying felsic volcanic rocks; and
(5) interbedded felsic volcanic and sedimentary rocks.

Mineralization within the Caribou deposit is composed of seven lenses that are zoned mineralogically and chemically from a copper-rich vent-proximal facies (vent complex) near the bottom and western part of each lens, to a lead-zinc-rich vent-distal facies (bedded sulphides) near the top and eastern part of each lens. Although it is impossible to rule out one large sulphide lens that was dismembered during deformation, the common clustering of modern and ancient deposits in vent fields is consistent with multiple vent sites at Caribou.

The vent complex consists predominantly of pyrite + pyrrhotite + chalcopyrite + magnetite, whereas the bedded sulphides are composed of pyrite + sphalerite + galena + arsenopyrite + tetrahedrite. The massive sulphides are zoned such that copper, bismuth, cobalt, europium/europium*, and copper/ (copper + lead+ zinc) decrease, and zinc, lead, silver, tin, indium, arsenic, antimony, molybdenum, cadmium, mercury, and gallium increase, from the vent complex to the bedded sulphide facies. Compared to bedded sulphides, sphalerite, galena, and pyrite in the vent complex are also iron-, silver-, and arsenic-rich, respectively.

The western sulphide lenses at Caribou are underlain by a sulphide stringer zone that is composed mostly of pyrite + quartz + siderite impregnations and veins with iron chlorite selvages cutting hydrothermally altered felsic volcanic and sedimentary rocks. Because the rocks are highly strained, the sulfide stringer zone appears strata bound and individual sulphide veins occurs sub-parallel to bedding.

The massive sulphides consist of seven en échelon lenses, numbered 10 to 80 around the Caribou fold. The zones consist of 90% sulphides, mainly pyrite, sphalerite, galena and chalcopyrite. The main gangue minerals are magnetite, siderite, stilpnomelane, quartz and chlorite. Lenses 10, 20, 30, 70, and 80 occur on the north limb of the Caribou fold while lenses 40 and 60 are mostly on the eastern limb of the fold.


Mining Methods

  • Avoca

Source: p.32, 38

Summary:

The Caribou Mine has been previously developed and mined by different owners, employing a variety of mining methods. On November 2, 2012, Trevali gained control of Caribou through the acquisition of Maple Minerals Corporation. Trevali commenced underground mining in 2015 and commercial production was declared for the Caribou Mine and processing plant effective July 1, 2016.

Modified Avoca is the main mining method, supplemented by uphole retreat for partial sill pillar recovery. Modified Avoca stopes employ unconsolidated waste rock and surface stockpiled waste rock as backfill. Crown pillar recovery is not currently considered in the mine plan due to a lack of geotechnical information. 45-tonne capacity underground haul trucks transport the mined material through the underground ramp system and out of the mine through the conveyor portal, where surface stockpile pads, crusher and the process plant is located. On February 1, 2017, the Company announced, that as part of the planned transition from contract mining to an owner-operated model, the Company would procure a new underground mining fleet. The Company subsequently committed to an investment of approximately C$20 million to supply and maintain a full fleet of Sandvik supported mining equipment for the Caribou Mine. The fleet of equipment started arriving at site in May 2017. Increased operating efficiencies were seen in the new underground haul trucks and scoop trams of 23% and 4.3%, respectively. In addition, mine dilution has decreased to 8.4 % from 18.2% in the first half of 2017 due to the new cable bolter performance and efficiency.


Crushing and Grinding
Source: Source p.39


Processing

  • Flotation

Flow Sheet: Source

Summary:

The process plant at Caribou is a conventional milling and sulphide flotation plant with a 3,000 tonne per day nameplate capacity. The process plant includes crushing, screening, grinding, regrinding, and zinc, and lead flotation and filtering circuits to produce zinc, and lead concentrates. Concentrate production is stockpiled onsite prior to shipping and sale to Glencore. The zinc concentrate is transported by rail to Valleyfield, Quebec for further processing while the lead concentrate is further processed at Glencore’s nearby Belledune smelting complex.

Recoveries & Grades:

CommodityParameter20192018201720162015
Zinc Recovery Rate, % 79.175.6777765.8
Zinc Head Grade, % 5.75.95.945.975.31
Zinc Concentrate Grade, % 4746.9484748.3
Lead Recovery Rate, % 63.661.8635848.3
Lead Head Grade, % 2.32.32.552.661.99
Lead Concentrate Grade, % 38.738.8393937.6
Silver Recovery Rate, % 37.636.43936
Silver Head Grade, oz/t 2.122.232.29
Silver Concentrate Grade, oz/t 20.521.421.1

Production:

CommodityProductUnits202020192018201720162015
Zinc Payable metal M lbs 85 ^7572803724
Lead Payable metal M lbs 30 ^302531147.3
Silver Payable metal koz 810 ^700700890402186
Zinc Concentrate dmt 83,95090,58042,63027,080
Lead Concentrate dmt 31,97238,70617,1469,470
Gold Payable metal oz 1,005449
Zinc Equivalent Payable metal lbs 115,715,89555,173,589
Copper Payable metal M lbs
^ Guidance / Forecast.

Operational Metrics:

Metrics20192018201720162015
Ore tonnes mined 909,298 t887,141 t937,459 t449,488 t280,183 t
Tonnes milled 913,178 t884,529 t945,436 t436,730 t369,006 t
Daily milling capacity 3,000 t3,000 t3,000 t3,000 t3,000 t
Daily mining capacity 3,000 t of ore
Daily milling rate 2,005 t

Reserves at December 31, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 1.54 Mt Zinc 6.83 % 232 M lbs
Proven 1.54 Mt Lead 2.47 % 84 M lbs
Proven 1.54 Mt Silver 74 g/t 3,664 koz
Probable 1.12 Mt Zinc 6.31 % 156 M lbs
Probable 1.12 Mt Lead 2.59 % 64 M lbs
Probable 1.12 Mt Silver 76.4 g/t 2,751 koz
Proven & Probable 2.66 Mt Zinc 6.61 % 388 M lbs
Proven & Probable 2.66 Mt Lead 2.52 % 148 M lbs
Proven & Probable 2.66 Mt Silver 75.04 g/t 6,417 koz
Measured 6.65 Mt Zinc 6.67 % 978 M lbs
Measured 6.65 Mt Lead 2.47 % 362 M lbs
Measured 6.65 Mt Silver 71.93 g/t 15,379 koz
Indicated 3.81 Mt Zinc 6.61 % 522 M lbs
Indicated 3.81 Mt Lead 2.48 % 208 M lbs
Indicated 3.81 Mt Silver 75.16 g/t 9,207 koz
Measured & Indicated 10.46 Mt Zinc 6.5 % 1,499 M lbs
Measured & Indicated 10.46 Mt Lead 2.47 % 570 M lbs
Measured & Indicated 10.46 Mt Silver 73.11 g/t 24,585 koz
Inferred 5.31 Mt Zinc 6.11 % 715 M lbs
Inferred 5.31 Mt Lead 2.48 % 290 M lbs
Inferred 5.31 Mt Silver 74.64 g/t 12,743 koz

Commodity Production Costs:

CommodityUnits20202019201820172016
Site cash costs (produced) Zinc Equivalent USD 0.48 / lb 0.45 / lb
Total cash costs Zinc Equivalent USD 0.57 / lb 0.57 / lb
All-in sustaining costs (AISC) Zinc USD 1.24 / lb ^
All-in sustaining costs (AISC) Zinc USD 1.17 / lb† 1.14 / lb† 0.72 / lb†
C1 cash costs Zinc USD 1.07 / lb ^
C1 cash costs Zinc USD 1.03 / lb† 0.85 / lb† 0.62 / lb†
^ Guidance / Forecast.
† Net of By-Product.

Operating Costs:

Units2019201820172016
Total operating costs ($/t milled) USD 736858.657.5

Financials:

Units2019201820172016
Sustaining costs M USD 10.8  20.9  8.15  4.38  
Revenue M USD 75.2  0.08  118.4  56  
Gross profit M USD 44.8  6.02  
EBIT M USD -11.57  -0.06  42.1  
EBITDA M USD 1.37  -0.04  56  


Heavy Mobile Equipment as of May 11, 2017:
Source: Source p.2
HME TypeModelSizeQuantity
Drill Sandvik DL421 1
Drill jumbo (two boom) Sandvik DD321 2
Scoop Tram Sandvik LH514 8 cu. yd 5
Underground truck Sandvik TH540 40 t 7

Mine Management:

Job TitleNameProfileRef. Date
Mine Production Superintendent Morgan Coombs LinkedIn Apr 13, 2020
Mine Superintendent Travers Branch LinkedIn Apr 13, 2020
Technical Services Superintendent Marie-Claude Dumont LinkedIn Apr 13, 2020
VP Operations Hein Frey LinkedIn Apr 13, 2020

Staff:

EmployeesContractorsTotal WorkforceYear
259 90 349 2019
249 111 360 2018
252 115 367 2017
170 2016

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2020
Annual Information Form 2019
Financial Review 2019
Management Discussion & Analysis 2019
Management Discussion & Analysis 2019
Press Release 2019
Press Release 2019
Annual Information Form 2018
Management Discussion & Analysis 2018
Press Release 2018
Technical Report 2018
Annual Information Form 2017
Corporate Presentation 2017
Management Discussion & Analysis 2017
Press Release 2017
Press Release 2017
Annual Information Form 2016
Management Discussion & Analysis 2016
Press Release 2016
Annual Information Form 2015
Management Discussion & Analysis 2015
Preliminary Economic Assessment 2015

News:

NewsDate
Trevali to Restart Caribou Mine with Improved Economics; Continues Studies on Longer Term Value Potential January 15, 2021
Trevali Announces Temporary Suspension of Caribou Mine Operations March 26, 2020
Trevali Announces Drill Results along the North Limb at Caribou Mine Extending Mineralization to the North January 7, 2020
Trevali Announces Preliminary Q4-2018 Production Results and Provides 2019 Production and Cost Guidance January 17, 2019

Aerial view:

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