MNE 210 Exam Questions and Answers Rated 100%
(T/F) Kimberlites are emplaced by a rapid intrusive advance from great depth (up to150 km). Just below the surface, high pressure builds up as the magma encountersground water and degasifies; this pressure builds up until an explosion blows out ofthe...
(T/F) Kimberlites are emplaced by a rapid intrusive advance from great depth (up to150 km). Just below
the surface, high pressure builds up as the magma encountersground water and degasifies; this pressure
builds up until an explosion blows out ofthe surface material. Kimberlite pipes are shaped like carrots.
(1pts) - Answers True
Name 2 Things that can affect the color of a gem stone - Answers trace element impurities
heat
special conditions of formations
(T/F) The value of gems derives from their unique and strong colors, their rarity(except diamonds), and
their ability to be cut into shapes that reflect light. (1pts) - Answers True
(T/F) Van der Waals forces are responsible for geckos being able to walk on glass.(1pts) - Answers True
What geologic structure is the major source of platinum in South Africa? - Answers Layered Mafic-
Ultramafic Intrusions
Bushveld Complex
What commodity is mined a Banded Iron Formation deposit - Answers Iron
What is the leading theory for how BIF's formed - Answers Algoma- from submarine volcanoes
Superior-can have, but not necessarily, some volcanic input w/ most or all the ore derived from chemical
sediments precipitated from seawater
What is the age of most BIF's - Answers 4-.5 Billions Years Ago
(T/F) Mississippi Type Deposits are found along the margins of major sedimentary basins within mid-
continent areas that have very gentle dips. The ore has been deposited in open spaces in breccias, in
enlarged joints and fractures. - Answers True
What type of economic minerals would you mine in a MVT deposit - Answers Galena
Sphalerite
Barite
Fluorite
Order of Precipitate Minerals. What type of Deposits would contain these minerals? - Answers 1. Calcite
2. Gypsum or Anhydrite (if T and S are higher)
3. Halite
, 4. Sylvite
Evaporites
What are the likely host rocks for the mineralization in a MVT deposit - Answers Carbonates
Dolomite
Jasperoid
Breccias
Where in the world would you explore for porphyry copper deposits and Why? - Answers Subduction
Zones (such as Arizona)
That is where they form
(T/F) Kimberlites are found from the Precambrian into the Cenozoic period (1,600 to55 Ma) along
continental margins - Answers False
Found in stable parts of continents
Name 2 types of deposits that provide ingredients for fertilizer - Answers Phosphates: Phosphorite
Evaporites
What physical properties does a mineral hare to have to be found in a placer deposit? - Answers high
specific gravity
durable
not weathered
Does a sand and gravel mine have a high intrinsic or high place value, why? - Answers High Place Value
Describe the emplacement mechanisms for LMI deposits - Answers Magmatic ore deposits are derived
from accumulations of crystals of metallic oxides, or immiscible sulfide, or oxide liquids that formed
during the cooling and crystallization of magma
With epithermal deposits having such a high grade, why aren't they mined more often or looked at for
exploration targets? - Answers Usually to small and complicated to mine economically
Malachite - Answers Fizzes, Green, Mamillary
CU2 (CO3)(OH)2
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