The Croinor Property deposit is hosted by the synvolcanic Croinor Property sill, which has a general attitude of N295° and dips north at 50°–65°. The sill ranges from 60 to 120 m in thickness over a strike length of approximately 3 km. It can be observed on several outcrops and is intersected by numerous drill holes. Near the Croinor Property deposit, the sill is in direct contact with pyroclastic units. Elsewhere, the sill is in contact with fragmental volcanic rocks, and sometimes with massive volcanic rocks. Generally, the northern and southern contacts of the sill with the enclosing volcanic rocks are clearly observed by the sudden appearance or disappearance of pyroclastic fragments. The northern and southern contacts are generally foliated parallel to the regional S2 schistosity. They are strongly foliated to sheared in places, but practically undeformed in others

The Croinor Property deposit gold-rich lenses are made of quartz-carbonate-tourmaline-pyrite veins, altered pyritic host rock material, and/or tectonic breccia (pyritic host fragments within a quartz-carbonate tourmaline-pyrite vein). These mineralized lenses are spatially controlled by reverse-oblique shear zones that crosscut and displaces both the lenses and its dioritic host. A hydrothermal alteration halo surrounds these structures. Zoning begins with an epidote-chlorite envelope that gradually changes into a chlorite carbonate zone closer to the shear. Within the shear structure itself, the ho ........

Two mining methods are proposed to accommodate the geometry of the mineralization: sublevel long-hole retreat and conventional room and pillar.

Long-hole method
The long-hole stopes will be mined from 3-m-high levels at 15 m vertical intervals. For stope heights exceeding 13 m, the maximum stope panel was defined as 15 m long. It is assumed that only a small number of stopes will be backfilled and that some pillars will be left between panels and mining horizons. For stope heights of 13 m or less, longer stope panels were considered on a case by case basis.

The method consists of drilling and blasting 64 mm diameter holes in a pattern parallel to the walls. Holes are drilled upward or downward depending on the context.

The development sequence consists of accessing the mineralized zone and excavating a level cut in the mineralized zone. The mining sequence will require the excavation of a raise opening, which is either developed as a conventional raise or as a drop raise when a top access is available. Once development is completed, the mineralized zone is surveyed with precision for the preparation of the drilling and blasting pattern.

Room and pillar
In some areas, room and pillar was a technically better choice than long-hole due to the ore body angle lower than 43°. The proposed room and pillar stope configuration is based on typical industry practices for currently operating mines in deposits with similar v ........

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