NI 43-101 Independent Technical Report Mount ... - Adex Mining Inc.

NI 43-101 Independent Technical Report Rev 02 January 22 nd , 2010
Mount Pleasant North Zone Preliminary Assessment (Project 6526-03) 9-4
40 m laterally of the Upper Deep Tin Zone extending from 140 to 270 m vertical depth. Three
predominate alteration phases have been recorded: silicification, chloritization and sericitization.
Some silicified sections of drill core are moderately altered to kaolinite. The mineralization is
identical to that of the Upper Deep Tin Zone.
Mineralization occurs in hydrothermally brecciated and fractured granite rocks located adjacent to
granite and porphyry dykes. Arsenopyrite, cassiterite, sphalerite and chalcopyrite infill fractures
as veinlets, microveinlets, stringers or are deposited as blebs or pods, semi-massive sulphides
and disseminations. Tin content can range from 0 to 3 modal percent with the occasional
cassiterite grains displaying colliform textures. Some veins contain molybdenite and wolframite
(1-2% range) and native bismuth with disseminated specks of chalcopyrite. Veins can also
contain eplidote, talc and serpentine. The most common replacement minerals are arsenopyrite
and purple fluorite.
9.2.2 Upper Deep Tin
The Upper Deep Tin sub-zone contains tin-indium-base metal mineralization hosted in brecciated
Gr I and Gr II granite rocks and feldspar porphyry. There are a series of horizontal shaped
deposits that have been traced from drill Section 1+50NW to Section 4+50NW (same as the
Deep Tin Zone) from mine elevations 1,000 m to surface..
This zone is situated above the Deep Tin sub-zone extending from 80 to 140 m vertical depth
from surface. Alteration consists of silicification and chloritization (± kaolinite).
Cassiterite, sphalerite and chalcopyrite occur in hydrothermal fracture filled veins, as massive or
semi-massive sulphides, sulphide pods and disseminations in association with high
concentrations of arsenopyrite and purple fluorite. Wolframite and molybdenite are hosted in
veinlets as well as dissemination (1 to 2 modal percent) with minor amounts of native bismuth.
Again, some UST’s have also been observed in the drill cores.
9.2.3 #5 Tin Lode
Very little information is available describing the #5 lode. According to Parrish and Tully (1976), it
consists of four steeply northeast dipping lodes that strike 310° to 325°. This zone extends from
the surface to a vertical depth of 70 m. Tin mineralization occurs in the matrix of silicified breccia
rocks. The mode of mineral occurrence is very similar to that of the #6 and #1-3 lodes. During
the 2008 drill program this lode was expanded in tonnage considerably to the northwest and
includes a series of scattered, erratically mineralized and narrow indium-zinc-tin lodes situated
above and containing similar mineralogy to the Upper DTZ sub-zone. The lodes are commonly
connected by a halo of low grade Zn-In mineralized wall-rock which can in places be of economic
importance, but is not consistently.
9.2.4 North Adit
The North Adit sub-zone consists of a series of isolated tin-indium mineralized bodies that occur
outside the immediate contact zone of the intruding granite GR IIB cupola in the North Zone
(Figure 9-2). Intersections of tens of meters of mineralization occur mostly north and north-east of
this cupola. The distal relationship of these mineral deposits with respect to the main GR II-B
body is highlighted by the virtual absence of later granite porphyry dykes and associated lodestyle
mineralization. The deposits have been traced on drill section from 4+25NW to 6+75NW and
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Applied Process Chemical Engineering