Rare Element Resources
Bear Lodge Project
Canadian NI 43-101 Technical Report
October 9
th
, 2014
10135-200-46 - Rev. 0
7-4
and minor shaly limestone from the Deadwood Formation sediments occur along the
periphery of the complex and can also host gold mineralization.
The Paleozoic sedimentary rocks consist mainly of limestone and quartzite, with minor
sandstone, shale, and siltstone. Mesozoic rocks include siltstone and shale, with minor
sandstone. Tertiary sediments unconformably overlie all older rocks and consist of
loosely consolidated siltstone, sandstone, and conglomerate of local derivation.
Quaternary deposits include alluvium, soil cover, and colluvial deposits (Table 7.1).
Table 7.1 summarizes the formations and rock units in and around the Bear Lodge
Project area.
Table 7.1 - Summary of Bear Lodge Project Formations and Lithologies
Geol. Time
Formation
Thickness
Lithology
(Feet)
(Meters)
Quaternary
alluvium, land-slide debris
Pliocene
Ogallala
0-56
0-17
unconsolidated
gravels,
trachyte-
phonolite pebble-boulder conglomerate
Miocene
Oligocene
White River
0-138
0-42
poorly bedded, friable, tan siltstone
Unconformity
Eocene
Alkali
intrusives
trachyte, phonolite, heterolithic diatreme
breccia, latite, syenite, lamprophyre,
pseudoleucite porphyry, carbonatite,
silicocarbonatite
Paleocene
Cretaceous
Lakota
10-13
3-4
light grey to white medium grained
sandstone
Jurassic
Morrison
< 20
< 6
greenish-grey claystone
Sundance
~374
~114
sandstone & shale members
Triassic
Spearfish
509-
896
155-273
reddish brown, friable shale, siltstone
&fine grained sandstone, white gypsum
Permian
Minnekahta
43-59
13-18
thin grey limestone marker
Opeche
66-85
20-26
Fine grained reddish brown siltstone &
Shale
Minnelusa
574-
650
175-198
tan-light brown friable calcareous
sandstone
Pennsylvania
Mississippian
Pahasapa
509-
574
155-175
grey, massive fine grained limestone
Ordovician
Whitewood
~148
~45
light grey fine grained limestone
Deadwood
> 886
> 270
hard white, red quartzite, thin bedded
shaly limestone commonly inflated or
replaced by Tertiary intrusive bodies
Cambrian
Precambrian
Granitic basement and/or roof pendants
(Modified after Meyer, 2002)
