BUCHANS Polymetallic VMS Project
Adventus’ Buchans Project encompasses a 100% owned, 33,700 hectare package in the prolific Buchans mining camp located in Newfoundland, Canada.
The historically mined Buchans deposits rank among the world’s highest grade polymetallic (Zn-Pb-Cu-Au-Ag) VMS deposits, however, in comparison to other VMS camps worldwide it has seen limited exploration and research.
From 1927-1984, 16.2 Mt of ore grading 14.51% Zn, 7.56% Pb, 1.33% Cu, 126 g/t Ag and 1.37 g/t Au was mined at Buchans.
Adventus is conducting the first systematic district scale exploration of the broader camp in modern times.
- Easy access and simple logistics
- Simple permitting in pro-mining jurisdiction
- Low cost exploration
- Highly qualified operating team
Geology and Mineralization
The project is entirely underlain by the Ordovician Buchans Group which comprises a sequence of bimodal volcanic and volcaniclastic rocks. The calc-alkaline Buchans River Formation host all of the known massive sulphide deposits within the belt.
Mineralization consists of sphalerite, galena, chalcopyrite, barite and lesser pyrite. Barite is the most abundant gangue mineral in the ores and alteration is characterized by quartz-chlorite-sericite +/- K-feldspar +/- carbonate.
The 2014-2016 work programs comprised reconnaissance scale prospecting and mapping, compilation, soil, rock and till sampling, re-logging of historical drill core, and 3D integrated modelling (GOCAD®) of geological and geophysical data. In 2017, an additional 457 claims were staked and an airborne EM survey was flown over the full property package.
Several base metal bearing alteration zones have been identified for further follow up with a proposed program of prospecting, mapping and geophysical surveying (gravity and TDEM). Compilation of historical work and integration into GOCAD® to identify additional targets is also ongoing.
In comparison to other VMS camps worldwide Buchans has seen only modest exploration and research, especially in the past 25 years.
2014 was the first time in 20 years that large parts of the Buchans camp were open to staking. Adventus now controls the largest land position within the belt.
99% of the historic work (drilling) and all mining preceded recognition of the current structural geology model related to fold and thrust belt tectonics.
The majority of the historic drill holes are shallow and within close proximity to the former mine area. All discoveries happened more than 50 years ago and were shallow discoveries or extensions of known deposits.
In 2017, the first high resolution airborne survey in >15 years (including heli-TDEM) was completed on Buchans and peripheral areas with prospective stratigraphy, which identified 35 drill-ready targets.
TARGET 1 - Horseshoe Pond:
- Coincident Cu-Zn soil anomaly over an area of ~100 x 900m.
- Outcrop and boulders of altered and mineralized felsic-mafic volcanics found during prospecting yielded up to 0.46% Zn and 0.45% Cu.
- Historic drill hole to the north of the soil anomaly, intersected 0.71% Cu over 1.5 m.
- v995 UTEM survey over the area yielded several conductors which were not followed up.
TARGET 2 - Lake 3, 7, 12:
- Altered, mineralized “ore horizon” rocks intersected below a thrust fault.
- Area has seen only shallow drilling.
TARGET 3 - McLean East:
- Historic drill hole that intersected polylithic debris flow with ore clast was only drilled +3 metres due to poor recovery.
- Another drill hole in the area was surveyed with downhole EM resulting in an off-hole EM conductor that was not followed up.
TARGET 4 - Seal Pond:
- Alteration zone outlined over an area of at least 0.3 x 6 km.
- 13.45% Zn, 0.4% Cu over 0.2m discovered from archived drill core sampled by Altius in 2015 (ddh SP-05-05).
- Coinc. Zn-Cu soil anomaly over an area of ~1,500 x 700 m.
TARGET 5 - Mary March Brook:
- Historically documented occurrence of altered, mineralized felsic volcaniclastic yielding up to 0.46% Zn, 0.07% Cu and 4 g/t Ag (2015 grab sample).