Rare Element Resources
Bear Lodge Project
Canadian NI 43-101 Technical Report
October 9
th
, 2014
10135-200-46 - Rev. 0
7-3
sediments in the northern half (Figure 7.2 and Table 7.1). The core consists of the
upper levels of a mineralized Tertiary alkaline
‐
igneous complex that intruded and
domed the surrounding Paleozoic and Mesozoic sedimentary rocks in the early
Tertiary (approximately 38
‐
50 million years ago). The alkaline
‐
igneous complex has
surface dimensions of approximately 2.8 by 6 miles (4.5 by 10 km), elongate in a
northwesterly orientation, and with a number of small intrusive outliers cutting
sedimentary rocks outside the complex. The Bear Lodge complex consists of multiple
intrusions of phonolite, trachyte, and other alkaline igneous rocks, and a variety of
associated breccias and diatremes. REE mineralization occurs in the north
‐
central
core, and anomalous gold mineralization is widespread.
Figure 7.2 - Geology of the Bear Lodge District
(Modified from Staatz, 1983)
Several large Precambrian granitic bodies occur within the southern portion of the
complex. The Precambrian units may be roof pendants or, alternatively, may be
anchored in the basement. Large isolated blocks of Precambrian granite are found in
sections 20 and 21 within the intrusive complex. Screens of quartzite, conglomerate,
