Overview

Mine Type	Open Pit
Status	Inactive / Suspended
Commodities	Gold
Mining Method	Truck & Shovel / Loader
Mine Life	...
Snapshot	On February 14, 2024, Orea Mining Corp. (the company) announced Resignations and Wind-Up. The Company reports that it exhausted all possible options to move the Company and the Montagne d'Or gold project forward due to the extenuating circumstances resulting from international sanctions imposed against its joint venture partner Nord Gold plc. Orea was assigned into bankruptcy on April 17, 2024. Crowe MacKay & Company Ltd., has been appointed as Licensed Insolvency Trustee of Orea's bankrupt estate, and affirmed by Orea's creditors at a meeting held on May 7, 2024.

Deposit type

• Vein / narrow vein
• VMS
• Breccia pipe / Stockwork

Summary:

The current interpretation is that Montagne d’Or is a deformed volcanogenic massive sulphide deposit (Ross 2014).

The Montagne d’Or prospect consists of a family of tabular mineralized bodies that form closelyspaced sub-parallel east-northeast (084°) striking and steeply (72°) south-dipping mineralized zones. Mineralization has been encountered over a strike length of more than 2,500 m and to a vertical depth of at least 200 m. Only a small portion of the gold mineralization has been subjected to upper level oxidation. The significant fine-grained gold mineralization is principally affiliated with sulphide veins and masses within fresh country rock that begins at shallow depths.

Two significant styles of gold mineralization have been recognized although they show a gradational relationship between each other:

-SMS with gold mineralization
-Sulphides in disseminated stringers with gold mineralization

SMS was a term coined by previous operators and was used to support a “VMS” type model for the mineralization. It is characterized by a high sulphide content (>20%) and occurs over intervals ranging from tens of centimetres to up to 4 m. This mineralization was later interpreted to represent zones of thicker, deformed and transposed sulphide ± quartz-rich veins and a denser distribution of disseminated sulphide as compared to that of the disseminated type.

The SMS also includes sulphide-rich breccia dykes, which host rolled and milled clasts of host rock within a ductily deformed pyrite-chalcopyrite-pyrrhotite matrix. In addition, bornite is present, and minor amounts of arsenopyrite have been identified petrographically. There is a clear correlation between sulphide veinlets and sulphide-rich breccia zones and high gold grades.

Mineralization is hosted by felsic, mafic and intercalated mafic/felsic rocks to varying degrees. However, approximately 80% of the gold mineralization in the deposit occurs within the more felsic units, mainly the Felsic tuff unit.

The mineralization appears as elongated lenses of higher grade material within broader zones of low grade but anomalous mineralization (0.25 g/t Au to 0.4 g/t Au). Several distinct anomalous mineralized domains are recognized, separated by barren intercalated mafic and felsic rocks.

The Montagne d’Or deposit is now thought to be part of a stratiform/stratabound deposit type. Mineralization consists of pyrite, pyrrhotite and chalcopyrite with minor sphalerite, magnetite and arsenopyrite. Arsenopyrite, although observed, does not appear to have an obvious relationship with either gold or copper mineralization. Distinct phases are reported as stratiform disseminated sulphides, stockwork sulphide veinlets and layers of semi-massive sulphides that are tectonically transposed. The latter facies is considered as syn-volcanic in origin and as the most favourable occurrence for gold mineralization.

The disseminated sulphide veins could be related to feeder zones and/or remobilized on fold hinges and shear zones. In addition, evidence is found for tectonic remobilization with sulphides concentrated within fold hinges and pressure shadows, and cross-cutting sulphide-bearing veins.

Visible gold occurs in chlorite-rich zones or is spatially related to sulphide mineralization (after Giraud, Tremblay, Jébrak and Lefrançois, 2014). This particular 1 m interval ran 80.75 g/t Au. There is generally an increase in gold grades as sulphide (excluding pyrrhotite) content increases. Microscopic studies indicate that gold occurs as very fine grains in the host rock groundmass and at the junctions of quartz crystals. Gold has only very rarely been seen as inclusions within sulphide minerals.

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Comminution

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Processing

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Production

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Personnel

Job Title	Name	Profile	Ref. Date
.......................	.......................		Apr 28, 2017
.......................	.......................		Apr 28, 2017

Employees	Year
......	2017