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) 9-2
The Endogranitic and North W-Mo sub-zones are not included in the focus of this Report.
Figure 9-1: Representative Cross-section of Mount Pleasant Mineralized Zones
(Figure Credit: Watts, Griffis & McOuat)
The eight modeled sub-zones or deposits that make up the North Zone are distributed over an
area of 450 by 250 metres extending from the surface to a vertical depth of 450 metres. An 1,100
metre decline, which was used to collect bulk samples in 1986, extends from the Fire Tower Zone
underground workings to the Endogranitic sub-zone. The decline and underground workings are
presently flooded. An exploration drive developed in the 1960s extends from the surface to the
vicinity of the #1-3, #4 and #6 Tin Lode sub-zones. Many of the North Zone deposits contain
significant amounts of indium with the zinc. Indium-bearing tin-base metal zones in the North
Zone appear to be principally associated with sphalerite and are more concentrated in the Deep
Tin Zone (Sinclair et al, 2005). Host rocks are often brecciated and altered to a fine-grained,
greisen-type assemblage of quartz, sericite, topaz and fluorite.
The principal mineralogy of the deposits consists of fine to very fine-grained cassiterite,
arsenopyrite, löllingite, sphalerite and chalcopyrite with lesser amounts of stannite, pyrite,
marcasite, galena, wolframite, molybdenite, tennantite, chalcocite, bornite, native bismuth,
bismuthinite and wittichenite. Other associated minerals include abundant fluorite and chlorite
(Kooiman et al, 2005). The tin and porphyry tungsten-molybdenite deposits of the North Zone
represent two different periods of mineralization even though they overlap spatially. Tin
mineralization in the North Zone is younger than the Fire Tower Zone and crosscuts the older
molybdenum-tungsten zones.
Thibault & Associates Inc.
Applied Process Chemical Engineering