Bur Property

The Bur Zone Project is located approximately 145 km east-northeast of Flin Flon, Manitoba and 22 km northeast of the town of Snow Lake, Manitoba. Rockcliff holds a 100% interest in the Bur Property, subject to a 2% NSR Royalty.

Geology

The Bur Zone lies within the eastern portion of the Flin Flon – Snow Lake Greenstone Belt (the belt). In the project area, the predominantly Cu and Zn mineralization is hosted in a sedimentary massive sulphide-type deposit that occurs in the Burntwood Group. The Bur Zone being a sediment hosted VMS deposit, is different to other base metal deposits in the Snow Lake region that are typically hosted in felsic to mafic volcanic and volcaniclastic rocks.

The stratiform mineralized zone (MZ) averages 2 m true thickness, strikes northeast (045 degrees) and dips by approximately 60 degrees towards the northwest. Strike length is approximately 6km.

Mineral Resource Estimate

On November 22, 2021 Rockcliff announced the results of an updated N.I. 43-101 Mineral Resourece Estimate, containing 3.02Mt Measured and Indicated at 3.84 % Copper Equivalent and 2.34Mt Inferred at 4.00% Copper Equivalent.  A copy of the technical report can be found below, as well as filed on SEDAR.com.

Bur Mineral Resource Estimates – Effective October 26, 2021
Classification Tonnes ('000t) Cu (%) Zn (%) Au (gpt) Ag (gpt) CuEq (%) CuEq (Mlbs)
Measured                    338          1.54 3.58 0.05 12.94 2.87                  21
Indicated                2,679          1.70 6.45 0.02 3.41 3.97                234
Measured + Indicated                3,017          1.69 6.13 0.02 4.48 3.84                255
Inferred                2,342          1.03 8.65 0.00 0.91 4.04                209

Mineral Processing and Metallurgical Testing
Metallurgical testing was conducted by Hudbay in 2007 and by Rockcliff in 2020. The metallurgical test work completed by Hudbay was limited in scope and was primarily focused on whether the Bur Zone deposit mineralization, the mineralized zone (MZ), could be effectively treated at Hudbay’s Snow Lake concentrator. Metallurgical testing undertaken by Rockcliff in 2020 demonstrated that with the application of ore sorting technology, Zn in the MZ feed could be upgraded from 3.68% to 4.8% with a recovery of 98.6% and Cu in the feed upgraded from 1.65% to 2.02% at 90.9 % recovery. For waste rock, Cu grade was increased from 0.16% to 0.42% and Zn grade was increase from 0.17% to 0.29%. Floatation tests were able to generate Cu concentrates 25.5% Cu with 76 % recovery containing ~5% Zn and 56% Zn with 57% recovery. General expectations related to closed circuit performance is a marketable copper concentrate with ~82% recovery and zinc concentrate with ~80% recovery.  Further details can be found in the October 29, 2020 Press Release