Krats - Department of Natural Resources

NEWFOUNDLAND & LABRADOR
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Krats - Copper-Nickel -Cobalt
LABRADOR
Nain
Province
Churchill
Province
Makkovik
Province
Superior
Province
Happy Valley/
Goose Bay
Labrador
City
Grenville
Province
KRATS
PROPERTY
Port Hope
Simpson
The Krats Property consists of 161 claims located 80 km northeast of Labrador City, 5 km east of
Sawbill Siding on the QNS&L Railroad. Access to the area can be by float plane to Evening Lake,
just to the south of the property. Access is also possible by weekly train to Shefferville or by
helicopter.
²
Regional Geology
The Mid Proterozoic 1.4 Ga Shabogamo Gabbro occurs in the Southeastern Churchill Province
(SECP). The Grenville Province collided with the late Archean rocks of the Superior Province, the
Lower Proterozoic Churchill (Rae) and Archean Nain Provinces along the Grenville Front (Wilton,
1995). The Grenville Front dominates the geology of the region. It is a probable crustal suture that
forms part of the major Circum Superior terrane boundary.
Schist, Phyllite and Slate
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a mo Ga
Sha bog
e
lit
o
ib
Amph
Local Geology
The property is underlain predominantly by metamorphosed shale, siltstone and sandstone of the
Map 1. Property location map
Knob Lake Group (ca. 1877 Ma) comprising reduced graphitic slate of the Menihek Formation,
Attikamagen Formation schists, Denault Formation marble and Sokoman cherty ironstone and quartzite.
These meta-siliciclastics are intruded by the Shabogamo Gabbro. The Shabogamo Gabbro sills, dikes, laccoliths and stocks (up to ~50
x 10 km) are believed to be part of a regional mafic magmatic event extending for ~500 km which includes the Michael Gabbro and
possibly the Mealy Lake dikes (Gower et al, 1990). Intrusions consist of gabbros, olivine gabbros, lesser gabbronorite and rare
occurrences of troctolite affected by amphibolite grade metamorphism. Cumulate layered rocks are common.
0
300
km
.27% Cu,
.27% Ni
.09% Cu,
.1% Ni
.32% Cu,
.29% Ni,
379ppb Au
.11%Cu, .11% Ni
0
0.75
Km
1.5
(
!
_
^
^
_
(
!
_#
^
_
^
#
_
^
Krats Showing
Legend
.08%Cu, .28% Zn
br o
am o G ab
Sh ab og olite
Amphib
,
mi te
Dolo t
r
e
h
C
.126%Pb
Evening Lake
Krats Property
_
^
Historic Occurrences
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#
Gabbro Float
Gabbro Bedrock
Stream Sed
Line 3
Line 10
s
ss
s
S
s
ss
Line 1
ss
Line 2
Line 5
Line 6
Line 4
Line 7
Line 8
Line 9
Ga
bb
ro/
g
gg
g
g
gg
g
ggg
Gggggg
s
ss
s
s
Mineralization
The principal mineralization on the Evening Lake Property is the Krats Showing discovered in 1998 by the late Karl Krats and his Map 2. Claims and geology map
prospecting colleagues, who were ground-checking anomalous Zn values in lake-sediment data (Kerr, 2007).
Mineralization consists of heavily disseminated magmatic sulfides with
Krats Property
clusters of violarite replacing pentlandite in hydrothermally altered
Airborne EM anomalies
Shabogamo gabbro-dolerite mineralization exposed in a trench on the Krats
ox o
property. Violarite with good octahedral pentlandite cleavage and expansion
o
o
x
o
cracks occurs with chalcopyrite in pyrrhotite (Muntanion, 2002). Samples
o
o
Z
oo
o
o
collected during initial prospecting contained up to 0.6% Cu and 0.6% Ni
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(Kerr, 2007).The property contains multi-element anomalies in both soil and
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bedrock. Blebby and disseminated sulphides occurring in gabbroic and
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sedimentary rocks returned values of 0.29% Ni, 0.32% Cu, 0.026% Co,
Legend
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0.28% Zn, 0.12% Pb and 2.2 g/ton Ag. Limited assaying for PGE’s have
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o
returned trace platinum and palladium. The Ni-Cu-Co bearing rocks occur
in the footwall of an olivine gabbro sill, and are possibly part of a larger
xxxxxxxxxxx
x
xxx
Bedrock 1,2,3
xxEvening Lake
magmatic sulphide deposit. The Zn-Cu-Pb sulphides are present in black Xxxxx
xx
o
x
x xx
x
Geo. AEM Anomalies
xxx
x
xx
shale and slates near the gabbro
x
xxx
xxxxxxxxx
contact, possibly indicating the
Figure 1
Map 3. Prospecting results (Krats, 2001)
presence of a Sedex deposit.
The Evening Lake area was one of several follow-up targets explained in detail by
Property Highlights
government geochemical surveys (see McConnell, 1984, NLDME Report 84-2).
Sample
Ni
Cu
Co
Zn
Pb
Projection of disseminated sulphides to 100%
The survey returned substantial multi-element soil anomalies. Present work has
Actual Amounts (ppm)
ppm
ppm
ppm
ppm
ppm
sample
Cu
Ni
Co
Cu
Ni
Co
determined a triangular-shaped anomaly for Zn, Pb, Cu, over 200 m wide narrowing
PC2199 (rock) 2900
3235
261
63
9
PC9919 832 973 121 1.42 1.66 0.20
over 1 km (Map 3). BHP-Billiton and Gallery Resources conducted extensive
PC2499 (float) 2400
2710
175
110
8
PC9920 662 802 103 1.1 1.24 0.15
PC1899 (rock) 1039
880
131
60
4
exploration in the area following their optioning of the Krats Showing in 2001. The
PC9924
1.6 1.6 0.10
PC0399 (stream) 215
772
10
2800
77
exploration activity included airborne magnetic-EM surveys (Figure 1). Many of
PC9830 339 492 100 1.15 1.67 0.10
these anomalies have not been followed up. This area was selected because of the
Many samples have returned anomalous base metal and cobalt
surface Ni-Cu mineralization in boulders and its proximity to sheet-like bodies of
values; some contain trace PGE’s
exposed Shabogamo Gabbro. EM-16 surveys produced strong anomalies in the
area. There are several weaker anomalies over much of the property. A fan of
mineralized gabbro boulders were found in the area with a general NW to SE alignment, which agrees with the most recent glacial flow (Map 3) (Krats, 2001). The property has potential for
significant magmatic sulphide deposits.
d
lroa
Rai
sh
ale
Shabogamo Intrusive suite; metagabbro
and metanorite with relict igneous texture;
local undivided mafic rocks
Sims Formation; orthoquartzite
0
Knob Lake Group
0.5
1.0
Scale (km)
Menihek Formation; dark grey to black schist,
phyllite and slate, common graphite bearing
Zn-Pb-Cu soil Anomaly
Ni-Cu sulphides in boulders
Ni-Cu sulphides in bedrock
Line 10
EM-16 lines
calculated at 100% sulphides (%)
(bedrock)
(bedrock)
35/590*27
35/590*27
(boulder)
(bedrock)
FOR MORE INFORMATION CONTACT:
Peter Rogers
Tel: (709) 944-6445
E-mail: [email protected]
or Wayde Guinchard
Tel: (709) 364-3764
E-Mail: [email protected]
Produced By:
EM-16 Line 4, from west to east
Start-grid 19U 0681584---UTM-5942387
Source: Mineral Occurrence Database - Geological Survey,
Department of Natural Resources
Website:http://www.gov.nl.ca/mines&en/geosurvey
prospectors
resource room
Revised January, 2014
P.H. Davenport, L.W. Nolan, R.W. Wardle, G.J. Stapleton, and
G.J. Kilfoil, 1999 The Geoscience Atlas of Labrador.
Newfoundland Department of Mines and Energy, Geological Survey,
Open File NFLD/1305, Version 1.0