Company description: Canadian explorer with potential to transform into a 100koz to 200koz gold producer
Monarch Gold’s stated aim is to become a 100,000–200,000 ounce per year gold producer through development of its projects in the Abitibi gold belt in Quebec. The Abitibi gold belt has over its history of mining produced over 170Moz of fine gold along a significant geological shear zone system along the Wasamac-Beaufor-Croinor line, with secondary shear zones also exploited by the Swanson and McKenzie Break mines. There is no reason to doubt that the areas between the actual mines is lucrative hunting ground for further exploration.
The assets of Monarch (comprising its flagship Wasamac project, Beaufor, Croinor, Swanson and McKenzie Break) are located approximately 500km north of Toronto in Quebec province, Canada, about 50km south-southeast of Lake Abitibi near Rouyn-Noranda (Exhibit 1). It is an attractive area to be building a portfolio of projects close to efficient infrastructure, with a high-capacity railroad, highways, power, mills and water all in close proximity to the company’s projects. The company has used the Camflo and Beacon mills in the past, though their high cost precludes them from being used in the future. The Kidd Creek mills, which are likely to be used to treat Wasamac ore initially, are approximately 150km west-northwest of Wasamac, with good railway links between the two.
Exhibit 1: Location of Monarch’s projects, Abitibi, Quebec.
|
|
|
The company’s flagship Wasamac project, which represents around 80% of the value of the company, has estimated average cash operating costs of US$550/oz and all-in sustaining costs of US$630/oz based on the 2018 FS. The original December 2018 FS project capex of some C$464m included building a mill and processing plant. However, subsequent to the 2018 FS, management is instead likely to use spare milling capacity close to the Wasamac project and estimates that using this on a toll-milling arrangement, including the transport cost of the ore to the mill, would be similar in cost to operating its own mill, without having to invest in its own mill thereby offering a major capex saving of around C$230m. In May 2020 Monarch signed a memorandum of understanding (MOU) with Glencore for the potential use of its Kidd Creek concentrator. A study is about to be undertaken relating to upgrading the concentrator. If Monarch and Glencore agree to proceed, Monarch toll milling could start by end CY24. Production, subject to funding and approvals, is thus expected to start in FY25 (ie the year ending 30 June 2025). The company’s four other projects are in the same region and could potentially be brought into production quite quickly and at a similarly low cost.
Geologically, the Abitibi greenstone terrane is highly conducive to further discoveries and, as in other parts of the world, even though measured, indicated and inferred (MI&I) resources seem limited in comparison to the past life of mines of the area, mining activity will continue for many years into the future. This is because the deposits are usually of very high grade, but are concentrated in ore bodies that need constant drilling and good geological interpretation to locate.
The Wasamac deposit is an Archean greenstone hosted gold deposit. It is 15km west of Rouyn-Noranda. The deposit is located in the Francoeur-Wasa shear zone (FWSZ). This fault is a second order fault of the Cadillac-Larder Lake Fault Zone (CLLFZ) and is of some kilometres in extent. The FWSZ cuts across the Black River meta-volcanics and is characterised by ductile deformation. It strikes east-west and is parallel to the CLLFZ dipping at 55°N. Gold mineralisation is restricted to the altered mylonitised zones in a series of sub-vertical lenticular bodies set every 350–450m apart and probably the result of concentration of disseminated gold in the meta-volcanics during deformation. All the zones Main through Zone 4 (Exhibit 2) dip 55°N except Wildcat, a near surface anomaly south of the Main Zone, outside the FS, which dips south, but may be amenable to bulk mining, though of lower grade but around 2.0–2.5 Mt in size, which would be a nice life extension especially if mineable at low cost.
Exhibit 2: Overview of the Wasamac potential high-margin underground operation
|
|
|
The Beaufor and Croinor deposits have the same geology as Wasamac, with the CLLFZ having some control over ore distribution within the shear zones. They have similar dips of 55°N and are lensoidal in shape.
The gold ore distribution is structurally controlled along shear zones or large faults, which, during high temperature and high-pressure deformation, provided a zone of low pressure and cavities into which migration of gold bearing fluids was accommodated. Along a shear zone, there is typically elongation of the zone, which results in a phenomenon called boudinaging and in lens shaped zones of higher-grade ore interspersed with lower-grade or barren zones at sometimes quite regular intervals. This phenomenon could assist in exploring for new or unknown orebodies in the region adjacent to known deposits.
The McKenzie and Swanson mineralisation is hosted within a diorite phase of the Pascalis-Tiblemont granodiorite Batholith The McKenzie Break and Swanson orebodies occur in the Blake River Group of the Abitibi greenstone belt. Mineralisation is hosted within a diorite phase of the Pascalis-Tiblemont granodiorite batholith and appears to be controlled by syntectonic plutons. The volcanic rocks are intruded by two major intrusive rocks, mafic gabbro-diorite sills and stocks that occurred at the time of intrusion and/or at the time of deformation.
The orebodies of the McKenzie Break are stacked lenses of gold bearing rocks, of which 12 have been identified. The lowermost lens or zone shows the greatest prospectivity with high grades having been intersected in the eastern part of the mine. The granodiorite batholith extends through most of the eastern half of the 134 claims comprising the McKenzie Break prospect. This means that the down-dip extensions of the stacked orebodies, especially the No. 12 zone, could be quite extensive. The Swanson deposit is also associated with syntectonic pluton emplacement and the structures and faults formed during the deformation. Together with intense hydrothermal alteration during deformation, this resulted in the flat-dipping ore bodies present at the mine.
The Monarch gold resources comprise a total of 3.155Moz measured and indicated and 375koz inferred (Exhibit 3) resources. With Monarch’s strategy to become a 100–200koz a year gold producer, and applying a conservative resource to reserve conversion factor of 50%, we think these assets could provide the company with mine lives of between eight and 17 years without further drilling.
Exhibit 3: Group reserves and resources
Monarch NI 43-101 resource estimate |
|
|
|
Mineral reserves (included in mineral resources) |
|
|
ktonnes (metric) |
Grade (g/t) |
Ounces (Au) |
|
ktonnes (metric) |
Grade (g/t) |
Ounces (Au) |
Wasamac |
Measured Resource |
3, 990 |
2.52 |
323,300 |
Proven Reserves |
1, 030 |
2.66 |
88,000 |
Indicated Resources |
25, 870 |
2.72 |
2,264,900 |
Probable Reserves |
20, 430 |
2.56 |
1,679,000 |
Total Measured and Indicated |
29, 860 |
2.70 |
2,587,900 |
Total Proven and Probable |
21, 460 |
2.56 |
1,767,000 |
Total Inferred |
4, 160 |
2.20 |
293,900 |
|
|
|
|
|
|
|
|
|
|
|
|
|
Croinor |
Measured Resource |
80 |
8.44 |
21,700 |
|
|
|
|
Indicated Resources |
724 |
9.20 |
214,300 |
|
|
|
|
Total Measured and Indicated |
804 |
9.12 |
236,000 |
|
|
|
|
Total Inferred |
160 |
7.42 |
38,400 |
|
|
|
|
|
|
|
|
|
|
|
|
|
McKenzie Break |
Indicated (pit) |
940 |
1.59 |
48,133 |
|
|
|
|
Indicated (ug) |
282 |
5.90 |
53,488 |
|
|
|
|
Total Indicated |
1,222 |
2.58 |
101,581 |
|
|
|
|
Total Inferred |
575 |
3.46 |
64,027 |
|
|
|
|
|
|
|
|
|
|
|
|
|
Swanson |
Indicated (pit) |
1,694 |
1.80 |
98,100 |
|
|
|
|
Indicated (ug) |
58 |
3.17 |
5,900 |
|
|
|
|
Total Indicated |
1,752 |
1.85 |
104,100 |
|
|
|
|
Total Inferred |
74 |
2.96 |
7,100 |
|
|
|
|
|
|
|
|
|
|
|
|
|
Beaufor |
Measured Resource |
74 |
6.71 |
16,100 |
|
|
|
|
Indicated Resources |
272 |
7.93 |
69,300 |
|
|
|
|
Total Measured and Indicated |
346 |
7.67 |
85,400 |
|
|
|
|
Total Inferred |
46 |
8.34 |
12,400 |
|
|
|
|
|
|
|
|
|
|
|
|
|
Total combined |
Measured and Indicated Resources |
|
|
3,155,361 |
|
|
|
|
Inferred Resources |
|
|
375,447 |
|
|
|
|
Source: Monarch corporate presentation, September 2020
In this section we will only focus on Wasamac, as this is the only mine that is actively being brought into production. The cumulative project capital to end 2025 is estimated, in the 2018 FS, which initially envisaged an earlier timetable, at C$464m. However, as previously mentioned, if Monarch were instead to conclude the proposed Glencore Kidd Creek toll milling agreement, this would give similar milling costs, but the capex envisaged in the 2018 FS could be halved, to around C$234m.
Mining of the Wasamac orebody will be done using the existing shaft system as ventilation shafts and primary access will be through a new ramp system from surface, which will be developed over the next two years in order to gain top-down access more rapidly to underground infrastructure than through the existing limited capacity shafts. We assume that the cost of the decline ramps will comprise C$80m of the C$137m estimated spend on mining. This will also allow much higher production rates with the Rail-Veyor conveyor systems than the old shaft hoisting.
The Rail-Veyor is fully electric and, with the very low cost of electricity in the area, is one of the main drivers of the low costs compared to its peers. The Rail-Veyor transports rock from the stope all the way to the surface in one trip. At nearby Goldex, for example, re-handling of rock is done multiple times on its way from the stope to the shaft, then hoisted to the surface, all with diesel driven transport underground. The cost of using the Rail-Veyor to transport rock to the surface is estimated by Monarch Gold at C$1.50 per tonne compared to using diesel trucks underground (with all their accompanying maintenance costs) and then hoisting the ore to surface through a volume restricted vertical shaft rock skip at C$8–10/tonne.
The mining method to be used is a transverse longhole stoping method, which will see the lens-shaped orebodies mined along the direction of the east-west strike of the orebodies. The slices of the ring drilled blast holes will be blasted sequentially with slice thicknesses of around 3m being cut and cleaned through the strike drives with safe, remote-controlled loaders, haulers and dumpers (LHDs). These LHDs will take the ore to ore passes or Rail-Veyor loading zones for transportation to surface through the shafts or the ramps systems.
We see the longhole stoping method as the most suitable for this type of orebody in a greenstone belt environment. It is also a well-known method used by many mining companies worldwide and is very low risk. In this method, holes are drilled from the tunnels alongside the orebody (tunnels can be inside the orebody and holes are drilled downwards parallel to the ore) and blasted. Small loading crosscuts from the tunnels are used to load the ore and transport it to the nearest ore pass. From the ore passes, it is loaded into hoists in the shafts or ramps, which take the ore to surface.
Advantages of this method include that it is a large tonnage generator and it has a lower cost than cut and fill methods.
Disadvantages include dilution is more difficult to control and accurate drilling is necessary.
We have added C$11.5m stay-in-business costs from 2026 onwards (roughly 10% of cash working costs) to allow for ongoing replacement of equipment and other costs resulting from depreciation of mining machinery.
The ore will be transported by rail to the site where the milling is to be done. As already alluded to, toll milling shows similar economics to those of own milling with broadly equivalent operating costs, when taking into account a transport cost element (which we estimate at around C$5–C$6/tonne or around 10% of the total operating cost). However, for Monarch, if it were to use the toll milling option, there would be the additional upfront benefit of a far lower initial capex.
The gold recovery circuit used typically for non-refractory greenstone belt ores is the tried and tested crush-mill-float-carbon in leach (CIL) – furnace-bullion route. Ore hoisted from underground is crushed to a few centimetres in size, then milled to less than millimetres in size, put through tanks where reagents are added to attach themselves to the gold particles in a liquid form, then into a carbon column where the gold particles are deposited on carbon particles, in a carbon column, then eluted and the product sent to a furnace to be smelted. The furnace is small (usually 1.5m diameter) and the bars are poured straight out of the furnace and sold to the local refinery.