Introduction

The 8,035 hectare Iron Lake property is located 45 kilometres northeast of 100 Mile House, BC.

Status

Iron Lake is 100% owned by Eastfield.

Geology

photo Iron Lake is a copper, cobalt, gold and platinum group elements project that covers a mafic to ultramafic intrusive body of probable early Jurassic age intruding a package of mafic to intermediate volcanic and related porphyritic intrusive rocks.

The Iron Lake Complex hosts disseminated and massive sulfide mineralization of a probable magmatic origin that is significant for its copper, cobalt, gold, platinum, palladium and to a lesser extent nickel content. A prominent aeromagnetic high covering several square kilometers centered on the complex resulted in incremental exploration initiatives starting in the mid 1970's directed at porphyry copper. Significant platinum and palladium anomalies were discovered in soils in the late 1980's at which time the extremely mafic composition of the rock suite was interpreted to be permissive for magmatic PGE rich mineralization.

In 2000 mineralized olivine pyroxenite rubble was discovered while prospecting a 1989 soil site which had returned a value of 392 ppb Pd. Two rock samples were collected from the rubble field with the first sample grading 0.59% Cu, 0.04% Ni, 0.53g/t Au, and 308 ppb PGE and the second sample 0.56% Cu, 0.04% Ni, 0.54g/t Au, and 287 ppb PGE. By 2012 several prospecting initiatives had located a total of eight samples of this material with an average metal content of 7,183 ppm Cu, 696 ppb Au, 416 ppm Ni and 324 ppb Pd+Pt.

In 2004 a helicopter borne airborne survey was completed over much of the claim group and a number of conductors identified some of which were further detailed by a 2006 UTEM ground survey. Targets from both surveys were drill tested in 2005 and 2006 with significant thicknesses of pyrrhotite dominant massive sulfide being intersected (e.g. 17 metre interval in excess of 60% sulfide in hole 05-03). Base metal values, while low to moderate in grade indicate that the sulfide mix includes copper, nickel and cobalt consistent with a magmatic sulfide model. Drill sites have now been constructed preparatory to testing massive sulfide mineralization both along strike and down dip, hoping for mineral zoning which could increase the proportion of chalcopyrite and pentlandite to pyrrhotite thereby increasing the grade of copper and nickel.

Two styles of magmatic sulfide mineralization present opportunities for discovery at Iron Lake. The first being disseminated sulfide with economically significant values of copper, gold, platinum and palladium; and the second being massive sulfide with economically significant values in copper, nickel and cobalt. A hybrid of the two styles of mineralization with the full suite of elements is also possible. Sulfide minerals in the disseminated style of mineralization are accompanied with 10% to 40% magnetite.

Recent work completed in 2011, 2012 and 2013 concentrated on completing extensive new induced polarization to delineate new targets. A number of robust targets were found and an exploration permit has been issued allowing them to be drilled.

Status

In 1987 the "Kevitsa" deposit was discovered in Finland and in 2008 it was acquired by a subsidiary of First Quantum Minerals Ltd. who put it into production in 2012. Kevitsa is a PGE and gold enriched copper, nickel deposit grading 0.41% copper, 0.31% nickel, 0.12 g/t gold, 0.24 g/t platinum and 0.18 g/t palladium. Mineralization is hosted in olivine pyroxenite and is disseminated in style and is considered to be magmatic in origin.

The Iron Lake Complex is also comparable in several respects to the Turnagain Complex in northern BC and the Tulameen Complex in southern BC. Both of these occurrences, as may be the case for Iron Lake, are thought by some workers to be Ural-Alaskan type ultramafic-mafic intrusive complexes. Complexes of this type in Russia host significant deposits of precious metals, particularly platinum, with historic alluvial platinum production alone exceeding ten million ounces.

It should also be noted that the prolific Norilsk nickel-copper-PGM deposits also in Russia are hosted in Triassic aged olivine pyroxenite, comparable in age and host rock petrology to Iron Lake.

Access


Much of the area of the claims have been clearcut logged resulting in the establishment of excellent access to the property. The ground is typical of interior British Columbia and consists of Douglas fir, pine and spruce dominant forests occurring on a flat to undulating and moderately hilly landscape.

Results

Disseminated Mineralized Rubble Results
Date
Sampled
Sample #
( Grab)
Cu
ppm
Au
ppb
Pt
ppb
Pd
ppb
Ni
ppm
Co
ppm
Fe
%
Mg
%
2000
DICM 10
6,417
571
76
135
377
65
5.2
6.5
2000
05-2000
5,667
540
67
220
395
78
5.7
6.9
2000
03-11-00-08
5,908
535
111
197
377
63
4.8
6.0
2001
I-1
7,170
759
120
189
409
72
5.4
6.2
2002
02-05-10
11,620
1011
127
348
565
90
6.8
8.2
2002
250576
6,257
642
113
167
287
45
4.2
3.9
2012
060687
7,779
739
237
141
540
106
8.4
13.2
2012
1R-10-7-12
6,645
772
159
190
380
65
5.6
7.4
Average
 
7,183
696
126
198
416
73
5.8
7.3


Massive Sulfide Drill Intercepts
Hole #
Description
Cu
ppm
Ni
ppm
Co
ppm
Pd+Pt
ppb
Fe
%
05-I-02 1.4 metres of massive sulfide (75.2-76.6 m).
6,635
299
1,349
33
47.5
05-I-03 17.0 metres of massive sulfide (32.9- 49.9 m; (60% MS interspersed with pyroxenite).
3,427
362
270
24
23.7
Incl. 1.4 metres of massive sulfide (47.8- 49.2 m).
9,525
927
1,298
5
55.7
05-I-04 Elevated Ni to 955 ppm (0.10% Ni) per 2.5 m sample (e.g. 23.0-25.5)
67
956
86
12
6.7
06-I-05 2.3 metres of massive sulfide assaying 0.54% Cu, 0.04% Co, 170 ppm Ni, (73.4- 75.7 m).
5,428
170
366
13
31.8
06-I-06 2.1 metres of massive sulfide (136.2- 138.4 m).
1,363
125
246
34
9.3
06-I-09 9.7 metres disseminated sulfide (129.6-139.3 m) (Elevated Bi averaging 22.3 ppm)
1,786
54
45
15
8.2

Maps

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Iron Lake - Regional Geology
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Iron Lake - Compilation
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Iron Lake - Soil Geochemistry
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Proposed Programs 2013
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Photos

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Iron Lake - Drilling in 2003
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Iron Lake Massive Sulphide
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Reports

  • Assessment_Summary_2017.pdf PDF

     

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