technical report on the nechalacho deposit, thor lake project ...

The preferred genetic model is that of igneous differentiation within a closed-system with rare
earth element concentration within a residual magma, aided by depression of the freezing
temperature of the magma by fluorine and possibly CO 2 .
CHARACTERISTICS OF THE NECHALACHO DEPOSIT
The Nechalacho deposit is the largest known mineralized body on the property. As exposed, it
is approximately triangular in shape and covers a drilled area of about 2.9 square kilometers. It
is known from diamond drilling that the mineralized zones are up to 200 m thick. Within the
mineralized zones, as described in Section 7 above (subsection entitled “Local Geological
Setting”) the important Basal Zone is described. This Basal Zone, unusually rich in heavy rare
earths, is persistent over most of the area of the Nechalacho deposit of some 1.5 km northsouth
and east-west. The thickness of the zone is indicated in Figure 8-1.
Figure 8-1
Isopach Map with Thickness of the Basal Zone
The geological variation within the Nechalacho deposit is complex. Within the Avalon lease
area the geology is dominated by a succession of syenites including the Ore (Nechalacho)
Nepheline Sodalite Syenite and the Thor Lake Syenite. The latter is believed to have evolved
into a more granitic unit known as the Grace Lake Granite. Together, these three phases form
the eastern part of the Blatchford Lake Intrusive Suite of Davidson (1978).
Technical Report 43-101 – March 13, 2011 Page 8-2
Prepared by Avalon Rare Metals Inc.