Enduro Confirms Copper-Gold Porphyry Mineralization at North Toe Prospect
Enduro Confirms Copper-Gold Porphyry
Mineralization at North Toe Prospect
Nov. 29th, 2023, Kelowna, British Columbia – Enduro Metals Corporation (TSXV: ENDR OTCQB:
ENDMF FSE: SOG-FF) (“Enduro Metals” or the “Company”) is pleased to announce results of its
2023 field campaign at the North Toe prospect. The program consisted of 1.8km 2 of detailed
geological mapping, 240 line-km of drone magnetics and the collection of 45 rock samples. The
results have built on previous field observations which identified multiple areas of mineralized
porphyry intrusions on surface. Individual geochemical samples from these outcrops include
grades up to 0.77% Cu and 0.63g/t Au.
The North Toe porphyry prospect sits approximately 8 km northeast of Burgundy Ridge and is part
of a recently identified 20km structural corridor controlling copper-gold mineralization known as
the Copperline (see Enduro News Release May 24th, 2023).
Highlights:
Samples from mineralized monzonite outcrops returned anomalous copper and gold
grades. Specifically, sample B0017858 assayed 0.77% Cu, 0.20 g/t Au and sample
B0017861 assayed 0.31% Cu, 0.63g/t Au (see Table 1).
Geological mapping identified key structural relationships to outcropping monzonites
which appear to be the primary host of mineralization at the North Toe prospect.
Drone magnetic coverage has been expanded by over 400% from the previous 2022
survey (see Enduro News Release April 11th, 2023).
Cole Evans, CEO of Enduro Metals commented,
“The discovery of mineralized intrusions on surface at the North Toe porphyry prospect is a
significant development for this target. These rock types and the styles of mineralization found
within them are highly indicative of a silica-saturated alkalic porphyry system, similar to
neighbouring deposits such as Red Chris and Saddle.
The magnetic data generated by our drone surveys support the preliminary geological theory
whereby these mineralized monzonite intrusions track along the Copperline structural corridor.
North Toe is emerging as an important prospect along the Copperline given its valley-bottom
location with ready access to road and power infrastructure, and expansive areas suitable for
theoretical mine construction.”
Figure 1: Plan view map of the North Toe prospect, including representative
sample of B0017858 which assayed 0.78% Cu and 0.21g/t Au. This monzonitic
intrusion is characterized by chalcopyrite – pyrite – bornite both disseminated
and vein-hosted (multi-generational). Strong alteration “reddening” is
characteristic of alkalic porphyry systems globally including Red Chris and
Cadia.
Geological Discussion:
Field mapping at North Toe carried out during 2023 focused on identifying intrusive
phases, while establishing the scope of alteration and mineralization over the greater target area.
Through this effort, a network of monzonite outcrops was identified. Field observations suggest
that the monzonite intrusions track along strike ENE trending structures, and may blow out into
larger bodies where perpendicular or oblique structures intersect. It is in these merging fault
zones where two main zones of mineralization were discovered, hosting multigenerational
veining, stockwork quartz +/- iron carbonate + sulphide veins, and disseminated chalcopyrite and
pyrite (see Fig. 2 and 3).
Figure 2: Plan view map of general mapping area with copper in rock geochemistry.
Figure 3: Plan view target area map of mineralized monzonite networks with copper in rock
geochemistry.
Samples gained from the southern-most outcrop of interest (See Fig. 3, 4, and 5) were slabbed
and analyzed. Several vein generations were observed including:
1. Quartz-chalcopyrite-pyrite veins with distinct pink envelope (k-feldspar?),
2. quartz +/- iron carbonate with an envelope or margin of maghemite +/- bio.
3. barren quartz veins +/- minor accessory minerals,
4. quartz-iron carbonate-maghemite-chalcopyrite veins.
Maghemite refers to the low temperature oxidation of magnetite to hematite. This is due to weak
magnetic properties around the metallic, black mineral as well as relic spinel crystal structures
that scratch red due to hematite replacement/alteration.
Chalcopyrite and pyrite were also observed to be finely disseminated throughout the intrusion,
away from the margins of observable veining.
B00178
58
B00178
61
Figure 4: Representative sample from B0017861; assayed 0.31% Cu, 0.64 g/t Au.
Figure 5: Representative sample from B0017858; assayed 0.78% Cu, 0.21 g/t Au.
Visual observations show weak-moderate reddening over outcrops of interest at North
Toe. It is currently unclear whether hematite or k-feldspar hydrothermal alteration is
responsible for the pinkish-red hue however, regardless of the mineral responsible, reddening
is considered prospective as alkalic porphyry systems commonly display zones of reddening
related to hematite within the inner propylitic alteration assemblage.
Figure 6: Plan view target area map of North Toe alteration interpretation from 2023 field work
program.
Drone Magnetics
240-line km of drone magnetics were flown over the North Toe porphyry prospect in
2023. Data from the geophysical survey suggests that faults are generally correlated with
intense magnetic lows. Rimming these magnetic lows are moderate-high magnetic anomalies
that may represent the mineralized and altered intrusions found on surface. Intrusions
observed on surface have varying amounts of ferromagnetic and ferrimagnetic minerals that
may contribute to magnetic anomalies such as magnetite, hematite, maghemite. Rock
geochemistry also shows a correlation between moderate magnetic highs and copper assay
values greater than 1000ppm (see Fig. 7). These moderate magnetic highs seem to cluster
around structurally controlled magnetic lows which suggest that mineralized monzonite
intrusions are utilizing local and regional structural conduits, with increased intrusion density
where faults intersect in double junctions.
Figure 7: Plan view map of North Toe total magnetic intensity and copper in rock geochemistry.