Atacama Resources International Inc (ACRL)

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excerpt; GENERAL GEOLOGY---$ACRL
EBY AND OTTO TOWNSHIPS,
KIRKLAND LAKE, ONTARIO
Eby and Otto Area FAULTS

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Eby and Otto Area FAULTS
A prominent north-striking fault offsets the western half of the Otto Stock about V/2 miles south, relative
to the east half. This fault transects regional northwest-striking faults and lineaments of the Lake
Timiskaming Rift Valley (Lovell and Caine 1970) several of which cross the map-area. Centred on one
northwest-striking fault, about 2 miles north of Round Lake, is a circular depression 3,500 feet in diameter
(Photo 1). The feature is inside the Otto Stock, and the outcrops both inside and outside the depression
are medium-grained syenite, coarse-grained syenite, and lamprophyre. Possibly the depression marks the
location of a younger related stock, or the junction of several joints and faults. The Larder Lake Fault has
been thought to extend through the northern part of Eby Township (Thomson 1948, p.28), and some
drilling for gold has been done to intersect parts of its presumed extension

The Atacama (former Allsopp-Huston) Property consists of 3 claim groups comprising 12 leased
(Atacama 1) and 4 unpatented (13 units) contiguous claims (Atacama 2) straddling the central portion
of the Eby/Otto Township boundary, and 2 unpatented claims (17 units) in north central Otto Township
(Atacama 3)

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Exploration for gold should be concentrated in the two northern concessions, in syenite, trachyte, and
carbonate rocks.
Howard Lovell continues by saying (page 16 Geological Report 99) that three facies of iron formation are
present in the map-area (Map 2239): magnetite-chert, graphite-pyrite-pyrrhotite, and carbonate. Most of
the exploration for gold has been concentrated in syenite, trachyte, and carbonate rocks along the Larder
lake Fault, so most of the carbonate rocks have not been thoroughly explored. He recommends: surface
prospecting, soil and bedrock geochemistry, and greater use of geology during interpretation of
geophysical work; this would provide more rewarding drill targets.
Howard Lovell reported (in Annual Report of the Regional and Resident Geologists 1974, Miscellaneous
Paper 60, 1975) that most of the gold probably originated from ultramafic rocks, syenitic rocks and clastic
and chemically precipitated sedimentary rocks, most of which built up from the sea bottom to form an
island arc.
The principal host rocks of the gold mineralization are:
a) syenite and trachyte (some of the trachyte is tuffaceous), and related porphyritic rocks;
b) low grade Algoma-type iron formation of the sulphide and carbonate facies, with some of the carbonate
rocks having a spatial and possibly genetic relationship to ultramafic rocks;
c) Timiskaming-type meta sediments, which additionally form the bulk of the country rocks.
T. L. Wells, Engineer with Erie Canadian Mines reported in 1938 that gold was found on claim L-17404
(North East 1/4 of North 1/2 Lot 5 Con V ) (1/2 mile North of Chartre-Dufresne Eby Property #1) in a quartz
stringer. Two samples yielded 2.74 oz/ton Au and 0.06 oz/ton Au, respectively.
This information is also reported in Mineral Resources and Mining Properties in the Kirkland Lake-Larder
Lake Area in the Ontario Department of Mines Mineral Resources 1964 Circular #3 on page 72.
Gold was also discovered on the Baldwin Consolidated Mines Property in the Northeastern corner of Eby
Township. G. L. Holbrooke reported that several small but rich gold ore-bodies lying in the zone are
associated with the more easily fractured syenite rocks.
The only gold values of economic importance found on the property to date occur where the N. 20
degrees East set of faults cut the vein system. (See Ontario Department of Mines Vol. LVII. Part I. 1948
(Special note from Annual Report for the Kirkland Lake Resident Geologist's District 1992 and Ontario
Geological Survey Miscellaneous Paper 161
81 tons of ore were milled yielding 43 oz of gold and 81 oz of Silver at a average grade of 0.531 oz Au/t. It
has been reported that there were favourable environments for gold in the Kirkland Lake-Larder Lake
Camp. In the Larder Lake sector, gold mineralization is associated with carbonatized ultramafic rocks along
the Larder Lake Fault, whereas around Kirkland Lake gold mineralization occurs in sheared syenitic
intrusions, trachytic flows end sedimentary rocks along the Kirkland Lake Fault.

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LOCAL GEOLOGY
L. S. Jensen reported in Genesis of Archean, Volcanic Hosted Gold Deposits 1980 (in the Ontario Geological
Survey Miscellaneous Paper 97) that the dominant feature of the Kirkland Lake-Larder Lake area is the
major fault system that appears to extend from Matachewan in the west through Noranda towards Val
d'Or. In many places this fault system is obscured by only slight displacement of the younger Proterozoic
rocks. The older the rocks, the greater is the displacement. This suggests that the fault system has been
active since the initial deposition of volcanic and sedimentary rocks in the area without a doubt this same
fault system has influenced the deposition of these rocks and their alteration along its length.
Gold mineralization is found in several rock types: gold-bearing ultramafic intrusions, laval flows
(komatiites), debris flows, felsic tuff, chert, iron formation, carbonaceous sedimentary rocks, argillite,
conglomerate, porphyritic intrusions and granitic intrusions. The range of mineralization is much greater
than that associated with massive suphide deposits.
L. S. Jensen continues by saying that gold exploration should be concentrated near major fault zones which
mark the tectonic boundary between volcanic piles or between volcanic piles and gneissic terrains which
have sedimentary aprons.
W. S. Savage in Mineral resources and Mining Properties in the Kirkland Lake-Larder Lake Area (Mineral
Resources Circular No. 3 (See Annex "H - 13C") reported that the formations of economic interest belong
to the earlier Precambrian era: volcanics, sediments and intrusives. The Break is a strong wide carbonized
shear zone, characterized by the presence of green mica and quartz stockworks. The Break or its branches
appear to have had some influence on the localization of most of the ore bodies. From the southern part
of Teck township, the Break has been traced southwestward to where it is overlain by the later Cobalt
series in Eby Township. The amount of displacement along the Break could be hundreds of feet or in miles
says W. S. Savage. The Keewatin and Timiskaming series were then invaded by Algoman intrusives: stocks,
dikes, irregular-shaped bodies of granite to diorite or lamprophyre. In Teck Township the most important
of the intrusives are the syenite, augite syenite and syenite porphyry. W. S. Savage continues by saying
that following the emplacement of the intrusive, hot circulating solutions produced carbonate
replacements along pre-existing faulted zones. This carbonatization was followed by the faulting which
opened up channel ways for the later solutions that produced the gold-bearing veins in the Kirland Lake
camp. The Kirkland Lake Fault branches away from the Larder Lake Break in the vicinity of Kenogami Lake.
Minor faults which branch off the "MAIN BREAK' have been important sources of ore

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