Overview
| Stage | Preliminary Economic Assessment |
| Mine Type | Underground |
| Commodities |
|
| Mining Method |
- Alimak
- Cemented backfill
- Backfill
|
| Mine Life | 9.5 years (as of Jan 1, 2022) |
The Project sequentially develops the Tower deposit and Rail deposit, initially beginning with the Tower deposit. |
Source:
p. 15
Rockcliff Metals Corporation is 100% owner of Tower and Rail properties.
Contractors
- Subscription is required.
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 ........
Source:
- subscription is required.
Flow Sheet:
Summary:
- 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.
| Category | Tonnage | Commodity | Grade |
|
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
|
Corporate Filings & Presentations:
- Subscription is required.
- Subscription is required.