Chrome Puddy

Chrome Puddy

Property Overview

Green Bridge Metals’ flagship property is the Chrome-Puddy Property, located in the Thunder Bay Mining Division of Ontario, approximately 90km north of Lac des Iles Palladium Mine. The Property measures 1,450 hectares in size, and covers over 90% of the 7% km strike length of the Chrome Puddy Ultramafic Intrusion within the Region and consists of 11 contiguous patented and 66 staked mining claims. The Property contains bulk-tonnage nickeliferous magnetite mineralization and a past-producing chromite mine both hosted in a serpentinized ultramafic intrusion. The Property has exploration targets for bulk-tonnage Ni mineralization, high grade Ni-Cu-PGM magmatic sulphide mineralization and chromite. The patented claims include both surface and mineral rights that were originally registered to Pavey Ark Minerals Inc. (“Pavey Ark”), a private Ontario corporation. In [Month] [Year] Green Bridger Minerals Corporation (“Green Bridge”), formerly named Mich Resources Ltd. (“Mich”) exercised an option to acquire a 100% interest in the Property from Pavey Ark, subject to certain considerations including cash payments, shares issuances and royalties (Mich Resources Ltd, Press Release, January 31, 2023). Pavey Ark received a diamond drill permit at the beginning of January 2023.

Geology and Mineralization

The Property is located in the Archean Obonga metavolcanic and metasedimentary greenstone belt that is part of the Wabigoon Subprovince of the Superior Province. In the Sturgeon Lake area to the west, this greenstone belt is host to significant volcanogenic massive sulphide deposits including the Cu-Zn-Pb Mattabi Mine that produced from 1972 to 1991.

The Property is underlain by the Puddy Ultramafic Intrusion that is exposed for 7 km along strike and is approximately 1 km in width. The primary lithologies of the intrusion include dunite, peridotite, and minor pyroxenite, all of which are serpentinized. Underground workings at the past-producing Chrome Mine and magnetic data indicate the intrusion have a southerly dip at approximately 45o. Biotite tonalite bounds the ultramafic intrusion to the north, and to the south, the ultramafic intrusion is bound by mixed metasedimentary and granitic rocks. North-striking and east-striking diabase dikes of middle Proterozoic age cut the ultramafic intrusion.

The ultramafic rocks have been completely altered to serpentine, talc, chlorite, carbonate, magnetite, and amphibole. Alteration in the form of serpentinization involves the addition of water, CO2, and other volatiles to the primary ultramafic assemblage. Magnetite is ubiquitous in the host rocks, being a coproduct of the serpentinization process and most commonly occurs as finely and irregularly distributed grains throughout the serpentine with remobilization into clusters, stringers and veins.

The nickel in magnetite may be largely derived from expelled nickel during the alteration of olivine to serpentine. The nickel in the Puddy serpentinite is now partitioned variably between several spinel phases, sulphides and silicates. Serpentinites in which nickel is concentrated in magnetite contain less than 0.15% total rock sulphur and are notable for a near-absence of sulphides. Conversely, serpentinites in which magnetite is nickel-poor contain the sulphides including chalcopyrite, pentlandite, sphalerite, siegenite, millerite and pyrite. Sulphur content of serpentinite is an important factor in nickel distribution at Puddy Lake.

Historical Exploration

Serpentinite hosted nickel mineralization on the Property has characteristics of Mt. Keith-style mineralization, but with sulphur-poor mineralogy that is dominated by Ni, Fe oxide phases.  The identification of conductive EM geophysical anomalies in the Puddy ultramafic intrusion also indicates the potential for discovery of a magmatic copper-nickel-PGE sulphide deposits in an environment similar to the Kambalda style Ni deposits.

Chromite concentrations occur along the northeastern contact of the serpentinite in a zone from the north end of Chrome Lake to the east end of the intrusion. The chromite occurrences are enclosed by dunite and locally peridotite. Remnant textures and mineral assemblages in the serpentinite reveals that most chromite occurs south of a contact between dunite and pyroxene-bearing cumulates (peridotite and orthopyroxenite). No dunite was recognized north of the chromitites. Cumulus chromite grains have Cr2O3 contents averaging 47.3% to 53.5% Cr2O3. Electron microprobe analyses of chromite grains characterize the composition as being predominately ferrian-chromite cores to chromian-magnetite rims. The Cr/Fe ratios from the Property range from 2.56 to 2.38 are some of highest encountered in Ontario. Chrome-Puddy occurrences have similarities to both the classical stratiform-type and podiform-type chromite deposits.

Exploration by Pavey Ark after acquiring the property in 2014, has included geological mapping, grab and channel sampling, petrographic and mineralogical analyses, and ground geophysics. The program has evaluated broad trends in chromium, nickel, iron and other elemental compositions in the ultramafic intrusion as well characterization of mineralization at the Commerce West and East nickel occurrences, and chromite mineralization at the E- and B-Zones. A significant number of samples from the ultramafic intrusion contain Ni contents in the range of 0.2 to 0.63% Ni, with some samples having elevated concentrations of Cu, Co, Pt, Pd, and Au.

Mapping and VLF-EM surveying on a 7.3 km grid northwest of the Chrome Mine Shaft has identified several conductors that are located within or near the northern contact of the ultramafic rocks that are drill targets for potential sulphide mineralization.

Exploration Goals

The Chrome Puddy Property may have the potential to host significant nickel and associated metals mineralization and merits further evaluation. Future work will include additional data compilation, airborne and ground geophysics, mapping and sampling, and approximately 4,000 m of diamond drilling, which will be completed in a two-stage program.  The first stage, Phase 1 program would consist of an airborne magnetic and EM survey, mapping, and sampling.  The second stage, Phase 2 program will be contingent on a successful Phase 1 and would likely consist of ground geophysics, additional mapping and sampling and 3,500 m of diamond drilling.

Technical Report