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Canada
Tower and Rail Project

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 Location:
85 km N from Grand Rapids, Manitoba, Canada

  Project Contacts:
82 Richmond Street East
Toronto
Ontario, Canada
M5C 1P1
Phone  ...  Subscription required
EmailEmail
WebsiteWeb
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Overview

StagePreliminary Economic Assessment
Mine TypeUnderground
Commodities
  • Copper
  • Zinc
  • Gold
  • Silver
Mining Method
  • Alimak
  • Cemented backfill
  • Backfill
Mine Life9.5 years (as of Jan 1, 2022)
The Project sequentially develops the Tower deposit and Rail deposit, initially beginning with the Tower deposit.


Owners

Source: p. 15
CompanyInterestOwnership
Rockcliff Metals Corp. 100 % Direct
Rockcliff Metals Corporation is 100% owner of Tower and Rail properties.

Contractors

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Deposit Type

  • VMS
  • Breccia pipe / Stockwork


Summary:

Deposit Types
At the Project, VMS sulphide mineralization that hosts both the Tower Deposit,and the Rail Deposit are consistent with the characteristics of VMS deposits.

The original depositional and stratigraphic relationships are obscured at the Tower Property by the lack of outcrop and the overprinting effects of high metamorphic grade and deformation. The Tower Deposit is interpreted to be a remobilized, high-grade VMS deposit. The Tower Deposit is the only known VMS deposit in the TNB. The Tower mineralization is similar to the VMS Cu-Zn-Ag-Au deposits in the Paleoproterozoic Kisseynew Domain and the Flin Flon-Snow Lake Belt (Bailes and Galley, 1999; Syme and Bailes,1993), to the west, thento the Ni sulphide deposits in the TNB. The closest known VMS deposit to the Tower Property is the Talbot Deposi twithin the Talbot Property, 35 km west of the Tower Property (Simard et al., 2010). The style of VMS mineralization at the Talbot Property appears to be very similar to the style of VMS mineralization at the Tower Property.

The closest known and well-characterized VMS style mineralization to the Rail Deposit are at the Lalor Lake and Chisel Mines located near Snow Lake, 38 km northeast of the Rail Deposit (Galley et al., 2007). The depositional environment for the Rail Deposit is interpreted similarly to that of the VMS deposits in the Flin Flon and Snow Lake mining camps. The Rail Deposit also shows evidence of regional metamorphic and deformati ........


Mining Methods

  • Alimak
  • Cemented backfill
  • Backfill


Summary:

The Tower deposit and Rail deposit would be mined sequentially by underground mining methods with
metals extracted in a processing plant custom built for the purpose.

At the Tower property, the mine will be accessed by a sinking box cut that will be driven at -10% to establish a large free face of 10m to 12m. The mine will be accessed from the surface by a decline collared in the rockface. The first two rounds of the decline will be designed to be upgrade at a sufficient grade to allow water to drain away from the portal. As the sinking cut is downgrade, a sump will be established outside the portal to control water and prevent inflows to the mine.

At the Rail property, the mine will be accessed from the surface by a decline collared in the hillside. An excavation will be cut into the hillside to create a large free face in which to collar the portal. The floor of the cut and the first two rounds of the decline will be designed to be upgrade at a sufficient grade to allow water to drain away from the portal.

The high value material at both projects sits in steeply dipping narrow veins, 1.5m to 2m wide, which is conducive to Alimak raise platform mining. Both declines will be driven at a nominal 15% downgrade and access the upper sections of the ore zones at approximate 100m intervals. Stoping blocks will be 100m to 125m high by 20m wide.

The mining method selected for both projects is the Alimak long hole stoping method. Main ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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Projected Production:

CommodityProductUnitsAvg. AnnualLOM
Copper Payable metal M lbs 206
Copper Concentrate kt 325
Copper Metal in concentrate M lbs 214
Zinc Payable metal M lbs  ......  Subscription required
Zinc Concentrate kt  ......  Subscription required
Zinc Metal in concentrate M lbs  ......  Subscription required
Gold Payable metal koz  ......  Subscription required
Gold Metal in concentrate koz  ......  Subscription required
Silver Payable metal koz  ......  Subscription required
Silver Metal in concentrate koz  ......  Subscription required
Copper Equivalent Metal in concentrate kt  ......  Subscription required

Operational Metrics:

Metrics
Daily milling rate  ......  Subscription required
Daily ore mining rate  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Annual ore mining rate  ......  Subscription required
* According to 2022 study.
Subscription required - Subscription is required.

Reserves at February 1, 2022:
Mineral resources are estimated at a cut-off grade of $80 per tonne in-situ value. The In-Situ Value was calculated utilizing process recoveries for Cu, Zn, Au, and Ag of 97.2%, 74.24%, 63%, and 63%, respectively.

CategoryTonnage CommodityGrade
Indicated 3,764,000 t Copper 2.51 %
Indicated 3,764,000 t Zinc 0.79 %
Indicated 3,764,000 t Gold 0.64 g/t
Indicated 3,764,000 t Silver 10.82 g/t
Inferred 1,578,000 t Copper 2.01 %
Inferred 1,578,000 t Zinc 0.93 %
Inferred 1,578,000 t Gold 0.67 g/t
Inferred 1,578,000 t Silver 7.85 g/t

Commodity Production Costs:

CommodityUnitsAverage
All-in sustaining costs (AISC) Copper USD  ......  Subscription required *†
Assumed price Zinc USD  ......  Subscription required&nbs
Assumed price Copper USD  ......  Subscription required&nbs
Assumed price Silver USD  ......  Subscription required&nbs
Assumed price Gold USD  ......  Subscription required&nbs
* According to 2022 study / presentation.
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units2022
UG mining costs ($/t milled) CAD 78.6 *
Processing costs ($/t milled) CAD  ......  Subscription required
G&A ($/t milled) CAD  ......  Subscription required
Total operating costs ($/t milled) CAD  ......  Subscription required
* According to 2022 study.
Subscription required - Subscription is required.

2022 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Pre-Production capital costs $M CAD  ......  Subscription required
Working capital $M CAD  ......  Subscription required
Sustaining CapEx $M CAD  ......  Subscription required
Total CapEx $M CAD  ......  Subscription required
UG OpEx $M CAD  ......  Subscription required
Processing OpEx $M CAD 89.6
Transportation (haulage) costs $M CAD 10.3
G&A costs $M CAD 65.9
Total OpEx $M CAD  ......  Subscription required
Total Taxes $M CAD  ......  Subscription required
Royalty payments $M CAD  ......  Subscription required
Gross revenue (LOM) $M CAD  ......  Subscription required
Net revenue (LOM) $M CAD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M CAD  ......  Subscription required
After-tax Cash Flow (LOM) $M CAD  ......  Subscription required
Pre-tax NPV @ 5% $M CAD  ......  Subscription required
Pre-tax NPV @ 8% $M CAD  ......  Subscription required
After-tax NPV @ 5% $M CAD  ......  Subscription required
After-tax NPV @ 8% $M CAD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
Pre-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.


Proposed Heavy Mobile Equipment as of February 1, 2022:
HME TypeModelSizeQuantityLeased or
Contractor
Alimak climber ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
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....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Feb 1, 2022
....................... Subscription required ....................... Subscription required Subscription required Feb 1, 2022
....................... Subscription required ....................... Subscription required Subscription required Feb 20, 2023
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
Preliminary Economic Assessment 2022
Press Release 2022
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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