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Table II Geochronology of Endako Batholith (from Villeneuve et al, 2001)
Plutonic phase
Age (Ma)
Late Triassic: Stern Creek plutonic suite
Stern Creek phase
219.3 ± 0.4
Early to Middle Jurassic: Stag Lake plutonic suite
Boer phase
181.0 ± 0.6
Stag Lake phase
162.0 ± 1.6
Taltapin phase
McKnab phase
166–164
Sugarloaf phase
171.0 ± 1.7
Sheraton phase
Stellako phase
Caledonia phase
Limit Lake phase
Tintagel phase
Late Jurassic: Francois Lake plutonic suite
Glenannan subsuite
Glenannan phase
157.2 ± 1.5
Tatin Lake subphase
Nithi phase
~155
Leg Lake pluton
Endako subsuite
Endako phase
148.4 ± 1.5
Francois subphase
147.9 ± 1.5
Pre-ore dikes
147.4 ± 0.6
Casey phase
145.1 ± 0.2
Cretaceous stocks
Hanson Lake phase
~126
Fraser Lake pluton
112.5 ± 0.31
Eocene Stock
Sam Ross Creek phase
50.6 ± 0.2
Younger volcanic rocks and related sub-volcanic intrusives are also important from an economic
geology perspective and include the Upper Cretaceous andesitic Kasalka Group, the felsic
Ootsa Lake Group (both deposited in caldera environments and associated with granodiorite
stocks and plugs of Quanchus and Bulkley Intrusions) and basaltic Eocene to Oligocene
Endako Group. The Kasalka Group has been interpreted as the host to New Gold’s Blackwater
Davidson deposit, 40 km to the south, as well as the nearby Capoose deposit.
The structural elements of the Nechako Plateau area are part of a regional Tertiary extensional
system that extends 1000 kilometres from northern Washington State, into the Babine district of
north-central British Columbia. This belt crosses all major terrane boundaries and underlies the
Quesnel, Kootenay and Omineca Terranes in the south and the Stikine Terrane in the north,
crossing the oceanic Cache Creek Group.
In the Endako area, Lowe et al (2001) describe most of the observed faults being related to
significant Tertiary transtensional deformation, with north to northeast-trending extensional
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faults and northwest-trending strike-slip faults. The localization of epithermal mineralization such
as at Blackwater Davidson and Capoose may be related to such structures.
P
ROPERTY
G
EOLOGY
The Property, including an area extending from Endako to Nithi Mountain, is situated on the
extreme southwest flank of a large batholith, formerly known as the Topley batholith and later
renamed as the Francois Lake Intrusions (Carr, 1966) and now the Francois Lake Suite of the
Endako Batholith (Villeneuve et al, 2001). The property is underlain by younger phases of the
batholith, from late Jurassic to early Cretaceous, in a geological setting similar to that of the
nearby molybdenite deposits at Endako and Nithi Mountain.
A few outcrops of Casey phase alaskite, belonging to the Endako subsuite, occur in the
southern and central parts of the property. Limit Lake phase quartz diorite is well exposed along
the high ridge south of the claims. The contact between the two units is considered to lie along
the southeastern edge of the property. Outcrops of Nithi phase quartz monzonite occur to the
west. This contact may lie within or near the western boundary of the property.
Table III. Geologic Map Units for the Xama Project Area (from BC MapPlace)
Eocene to Oligocene
EE
Nechako Plateau Group, Endako Formation – andesitic volcanics
Eocene
Evf
undivided intrusive rocks
Efp
feldspar porphyry intrusives
Late Cretaceous to Pliocene
LKi
Unnamed intrusives, undivided
Late Cretaceous
uKK
Kasalka Group – andesitic volcanics
LKCL
Cabin Lake Pluton – quartz monzonite to monzogranite
LKH
Holy Cross Pluton – feldspar porphyry intrusives
Late Jurassic
LJF
Endako Batholith,
Francois Lake Suite
LJFE
Endako Subsuite - Endako Phase – granodiorite
LJFF
Endako Subsuite - Francois Subphase – granodiorite
LJFN
Francois Lake Suite - Nithi Phase – quartz monzonite to monzogranite
Middle Jurassic
MJS
Endako Batholith, Stag Lake Plutonic Suite
MJSLS
Sellako Phase – quartz diorite
MJSLC
Caledonia Phase – quartz monzonite to monzogranite
MJSLL
Limit Lake Phase – quartz diorite
Early to Middle Jurassic
lmJH
Hazelton Group – undivided volcanics