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Canada
Heva-Hosco (Joanna) Project

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 Location:
21 km E from Rouyn-Noranda, Quebec, Canada

  Project Contacts:
Suite 1120, Cathedral Place 925 West Georgia Street
Vancouver
British Columbia, Canada
V6C 3L2
Phone  ...  Subscription required
Fax604-687-3932
WebsiteWeb
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  • Overview
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  • Filings & News

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Overview

StageFeasibility
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Processing
  • Gravity separation
  • Flotation
  • Inline Leach Reactor (ILR)
  • Concentrate leach
  • Counter current decantation (CCD)
  • Pressure oxidation
  • Carbon in pulp (CIP)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life13 years (as of Jan 1, 2012)


Owners

 
CompanyInterestOwnership
Hecla Mining Company 100 % Indirect
Aurizon Mines Ltd. 100 % Direct

Deposit Type

  • Vein / narrow vein
  • Sediment-hosted
  • Orogenic


Summary:

The Joanna property (formerly the Hosco-Heva) is situated in Joannes Township in the south central portion of the Abitibi Greenstone Belt, within the Superior structural province of the Canadian Shield. All rocks are Archean in age except for the late crosscutting Proterozoic diabase dykes.

The gold deposit at Joanna may be described as a sediments hosted orogenic gold deposit related to the structural control of the Cadillac fault. Mineralization is mainly developed in the form of finely disseminated sulfides envelopes (pseudo lenses) with minor quartz veining in Cadillac Group sediments in contact with mafic layers corresponding possibly to sill. The main brittleductile deformation comprising the Cadillac Fault is concentrated in these metasedimentary layers. The genetics of the deposit has not been studied in detail. Historically, previous exploration was focused on quartz veins within the deformation and mineralization corridor where gold was present in higher grades.

Gold appears to be mainly associated with finely crystallized sulfides in a biotite rich schist with minor deformed millimetric to pluri-centimetric quartz veins. Mineral assemblage also includes variable concentrations of white mica, carbonate, albite, garnet, and possible other aluminosilicates. Amphibole and tourmaline rich replacement zones have been locally identified.


Mining Methods

  • Truck & Shovel / Loader


Summary:

Mining Hosco ore will follow the standard practice of an open-pit operation with conventional drill and blast, load and haul cycle using drill/truck/shovel mining fleet. The overburden and waste rock material will be hauled to the overburden and waste disposal areas near the pit. The run-of-mine ore will be drilled, blasted and loaded by hydraulic shovels and delivered by trucks to the primary crusher or stockpiles near the crusher.


Crushing and Grinding
Flow Sheet: Source


Processing

  • Gravity separation
  • Flotation
  • Inline Leach Reactor (ILR)
  • Concentrate leach
  • Counter current decantation (CCD)
  • Pressure oxidation
  • Carbon in pulp (CIP)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The following is a summary of major processing steps and design criteria:

- Ore is crushed using a single jaw crusher. Crushed ore is stored in a concrete silo from which it is reclaimed with vibrating feeders onto a belt conveyor, which then feeds the SAG mill.

- The grinding circuit comprises a single pinion SAG mill with a variable speed drive operated in an open circuit, which feeds a ball mill with a fixed speed drive. The ball mill is operated in a closed circuit with a hydrocyclone cluster. The product of the ball mill circuit is then fed to a flotation circuit to be concentrated.

- A portion of the ball mill discharge is fed to a pair of gravity concentrating units operated in parallel, which recover gravity recoverable gold. The gravity circuit tailings are returned to the ball mill feed. The concentrate from the gravity circuit is upgraded using a shaking table (as a batch operation). The shaking table concentrate is directed to the melting ........

Recoveries & Grades:

CommodityParameterAvg. LOM
Gold Recovery Rate, % 87.5
Gold Head Grade, g/t 1.26

Projected Production:

CommodityUnitsAvg. AnnualLOM
Gold koz 1091,454

* According to 2012 study.

Reserves at December 31, 2019:

CategoryTonnage CommodityGradeContained Metal
Measured 38,550 k tons Gold 0.4 oz/ton 1,600 koz
Indicated 37,190 k tons Gold 0.04 oz/ton 1,520 koz
Measured & Indicated 75,740 k tons Gold 0.04 oz/ton 3,119 koz
Inferred 11,860 k tons Gold 0.06 oz/ton 664 koz

Commodity Production Costs:

CommodityUnits2021
Cash costs Gold USD 716 / oz *
Assumed price Gold USD 1,350 / oz *
* According to 2012 study / presentation.
Subscription required - Subscription is required.

Operating Costs:

Units2021
OP mining costs ($/t mined) CAD 11.9 *
Processing costs ($/t milled) CAD  ......  Subscription required
Total operating costs ($/t milled) CAD  ......  Subscription required
* According to 2012 study.
Subscription required - Subscription is required.

2012 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M CAD  ......  Subscription required
Sustaining CapEx $M CAD  ......  Subscription required
Closure costs $M CAD  ......  Subscription required
Total CapEx $M CAD  ......  Subscription required
OP OpEx $M CAD  ......  Subscription required
Processing OpEx $M CAD 508.3
Total OpEx $M CAD  ......  Subscription required
Net revenue (LOM) $M CAD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M CAD  ......  Subscription required
Pre-tax NPV @ 0% $M CAD  ......  Subscription required
Pre-tax NPV @ 5% $M CAD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
Pre-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.

Proposed Heavy Mobile Equipment as of December 31, 2012:
HME TypeSizeQuantity
Dozer 354 HP ....................... Subscription required
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Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 26, 2021
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
Year-end Mineral Reserves 2018
Annual Report 2017
Corporate Presentation 2013
Feasibility Study Report 2012
Preliminary Economic Assessment 2008
Subscription required - Subscription is required.

Aerial view:

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