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ore grade
– the average weight of the valuable metal or mineral contained in a specific weight of ore, i.e., 1.5%
REO/tonne.
oxide
– for purposes of the deposits found at the Bear Lodge Property, rare earth bearing mineralized material that
results from the complete oxidation by natural processes of sulfide-bearing material.
p.a. –
per annum.
preliminary economic assessment (“PEA”)
– a study that includes an economic analysis of the potential viability
of Mineral Resources taken at an early stage of the project prior to the completion of a preliminary feasibility study.
praseodymium (“Pr”)
– a metallic element that constitutes about 4% of the lanthanide content of bastnasite and has
a few specific applications, based mainly on its optical properties. It is a common coloring pigment, and is used in
photographic filters, airport signal lenses, and welder's glasses. Because it chemically and magnetically is so similar
to its periodic chart neighbors Nd and La, it is typically found in small amounts in applications where Nd and La are
popular, such as NdFeB magnets and catalysts. These latter applications are actually the largest uses for Pr because
the magnet and catalyst markets are so large. Thus Pr plays an important role in extending the availability of the
more popular Nd and La.
preliminary feasibility study
or
pre-feasibility study (“PFS”) –
each mean a comprehensive study of the viability
of a mineral project that has advanced to a stage where the mining method, in the case of underground mining, or the
pit configuration, in the case of an open pit, has been established and an effective method of mineral processing has
been determined. It includes a financial analysis based on reasonable assumptions of technical, engineering, legal,
operating, economic, social, and environmental factors and the evaluation of other relevant factors that are sufficient
for a qualified person, acting reasonably, to determine if all or part of the Mineral Resource may be classified as a
Mineral Reserve under NI 43-101 standards.
rare earth elements (“REE”) –
a group of metallic elements with unique chemical, catalytic, magnetic,
metallurgical and phosphorescent properties.
rare earth oxide (“REO”) –
the oxide form of REE.
RC (reverse circulation) drilling –
a rotary drilling method using either a hammer or a tri-cone bit to produce rock
cuttings that are forced upward from the bottom of the drill hole to the surface through an outer tube, using liquid
and/or air pressure moving downward through an inner tube.
recovery
– the percentage of contained metal actually extracted from ore in the course of processing such ore.
samarium (“Sm”)
– a metallic element of the lanthanide series predominantly used to produce Sm cobalt magnets.
Although these magnets are slightly less powerful than NdFeB magnets at room temperature, Sm cobalt magnets can
be used over a wider range of temperatures and are less susceptible to corrosion.
sampling and analytical variance/precision –
an estimate of the total error induced by sampling, sample
preparation and analysis.
stockwork
– complex system of structurally controlled or randomly oriented veins that can be standalone ore
bodies or occur on the periphery of larger veins. They are also referred to as
stringer zones
.
strike
– the direction or trend that a structural surface, e.g., a bedding or fault plane, takes as it intersects the
horizontal.
strip
– to remove overburden in order to expose ore.
sulfide –
a mineral combining sulfur and base metals, such as iron and less commonly copper, lead, zinc and/or
molybdenum; metallic sulfur-bearing mineral associated with primary REE mineralization.
tailings
– fine ground waste material produced from ore in the process of recovering metals or minerals.
