Greywacke North Deposit
- Located approximately 30 km north-east of the community of Missinipi with access from HWY 102 and maintained 13km of local trail to deposit
- Located over 6 dispositions; S-113351, MC00013637, MC00013636, MC00013629, MC00013646, and MC00013556 (16078 Ha). The Deposits however are situated on claim S-113351 (5791Ha)
- Multiple Geophysical surveys, field programs, and drill programs have been conducted on the property since it’s discovery in 1959
- Currently is the furthest distanced property to be considered as a spoke for Mas Gold Corps hub and spoke mine design.
Property Geology
- The Greywacke Property is located on the western edge of the MacLean Lake Group, at the MacLean-MacLennan contact.
- Of note on the Greywacke property is the “Arenite Suite” of rocks consisting of; lithic arenite, feldspathic arenite, polymictic conglomerate, oligomictic conglomerate, sandstone, conglomeratic sandstone, calcsilicate rocks and greywacke.
- Three intrusive units have been recognized on the property; pegmatitic dykes cross-cut all lithologies, and localized intrusions of tonalite and monzodiorite.
- The rocks of the Greywacke deposit have undergone middle to upper amphibolite facies metamorphism (Poulsen & Robert, 1994; D. J. Thomas, 1986)
- Outcrop mapping has revealed three property-scale deformation events consistent with regional mapping performed proximal to the Greywacke deposit (Coomb, Lewry, and MacDonald 1986).
Deposit Information
- Property first mapped in 1959 by the Saskatchewan Geological Survey with EM and magnetic surveys conducted in 1961 (Pearson & Froese, 1959)
- Major exploration by the Saskatchewan Mining and Development Corp. (now Cameco) began in 1977 and continued throughout the early 1980’s. Included regional prospecting, mapping and geophysical surveys and leading to the discovery of the Rainbow Showing.
- In the late 1980’s targeted prospecting and sampling around the present-day property identified three mineralized zones to the west of the now Greywacke Lake; North, Centre and South.
- Between 1989 and 1994; mapping, prospecting and magnetic surveys allowed for the tracing of the ‘Wacke Trend’ for 7 kilometres with several gold occurrences including the Hoover Lake showing outlined.
- At this time, drilling was undertaken by Cameco on the Greywacke, Hoover, Lyons and the Wasp showings with 4 holes drilled on the North and South zones. This marked the end of Cameco’s work at Greywacke.
- An updated Resource of Greywacke North was completed by Mas Gold Corp in 2021. An Au price of $1,600/oz was used for gold, and a metallurgical gravity recovery of 90% for gold was applied. (D. G. Thomas et al., 2022)
Deposit Highlights
- Gold at Greywacke Lake occurs as native gold in narrow lenses enveloped by lenses of disseminated sulphides including pyrite, pyrrhotite, minor chalcopyrite, galena and sphalerite.
- The host quartz-plagioclase-muscovite+/-biotite schist and gneiss are interpreted as lithic arenites and conglomerates.
- Minor and accessory minerals include pyrite, magnetite, green mica, molybdenite, sphalerite and galena.
Completed Work (MAS)
- MAS Gold Corp. gained interest in the Greywacke Property in 2001 with exploration beginning under the former name Masuparia Gold Corp.
- 25 Diamond drill holes were completed between 2001 and 2002 with 16 additional holes on the Greywacke North Zone. Extensive channel sampling, soil & lake sediment sampling, grab sampling and magnetic surveys were also completed.
- Success came in 2005 with the largest gold intersections to date. A 2007 resource estimation reported an indicated resource of 184,000 tones at 8.40 g/t gold and a inferred resource of 28,000 tones at 7.29 g/t using a 5 g/t cut-off grade (Naccashian, Del Bel Belluz and Maunula, 2007.) (Naccashian et al., 2007)
- Three further drill programmes under Masuparia in 2008, 2012 and 2014 and well as airborne geophysical surveys and channel sampling continued to delineate the Greywacke Zones.
- Most recently, MAS Gold Corp. completed a winter diamond drill programme in the winter of 2021.
Future Work / Plans
- Future exploration of the general area with the aim to increase the resource base and an economic study of the current resource including;
- Mapping and prospecting to test the East side of Greywacke Lake for structure related Au mineralization
- Mapping and prospecting the neighboring claim to follow up structures indicated from magnetic surveys that could host Greywacke-style Au
- Prospecting along the McLennan-MacLean Lake contact
- Future drill programs to further the resource evaluation including;
- Infill drilling at Greywacke South Zone and Closure Lake-Lyons Zone
- Exploration drilling at Shandy Lake and Hoover Lake showings to potentially intersect mineralized trend
- Resuming environmental baseline studies and the application for mine operation permits when deposit becomes incorporated into the Hub and Spoke model
- Additional metallurgical test work to assess and to identify an appropriate co-mingling process flow to fully incorporate Greywacke Lake deposit as a spoke in the hub and spoke mining model
- Facilitate an elevated confidence in both the assay and density databases to allow for resource to potentially be upgraded to a Measured Mineral Resource
Ownership Overview
MAS Gold Corp. 100% Owned Properties occupy key positions at the transition between the La Ronge Domain and Kisseynew Domain. MAS Gold Corp has been active in La Ronge Gold Belt since 1990’s. Total MAS Gold Corp holdings: 33, 843 hectares (83, 628 acres). All properties are 100% owned.