Removal of mineral-bearing ore from a surface excavation is called
A.
drift mining.
B.
open-pit mining.
C.
open-air mining.
D.
original-source mining.
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B.
open-pit mining.
For more than 2,000 years, the only known diamond sources were
A.
,alluvial.
B.
primary.
C.
kimberlite pipes.
D.
ancient volcanic craters.
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A.
alluvial.
Diamond rough suitable for use in jewelry is called
A.
cuttable.
B.
Grade A.
C.
top-quality.
D.
jewelry-quality.
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A.
cuttable
The concentration of diamonds within a pipe is called
A.
drift.
B.
ore grade.
, C.
overburden.
D.
rough grade.
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B.
ore grade.
The proper environment for diamond formation includes the right temperature,
pressure and
A.
molten lava.
B.
indicator minerals.
C.
the availability of carbon.
D.
the presence of trace elements
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C.
the availability of carbon.
Indicator minerals in kimberlite and lamproite include tiny
A.
emeralds.
B.
sapphires.
C.
amethysts.
A.
drift mining.
B.
open-pit mining.
C.
open-air mining.
D.
original-source mining.
Give this one a try later!
B.
open-pit mining.
For more than 2,000 years, the only known diamond sources were
A.
,alluvial.
B.
primary.
C.
kimberlite pipes.
D.
ancient volcanic craters.
Give this one a try later!
A.
alluvial.
Diamond rough suitable for use in jewelry is called
A.
cuttable.
B.
Grade A.
C.
top-quality.
D.
jewelry-quality.
Give this one a try later!
A.
cuttable
The concentration of diamonds within a pipe is called
A.
drift.
B.
ore grade.
, C.
overburden.
D.
rough grade.
Give this one a try later!
B.
ore grade.
The proper environment for diamond formation includes the right temperature,
pressure and
A.
molten lava.
B.
indicator minerals.
C.
the availability of carbon.
D.
the presence of trace elements
Give this one a try later!
C.
the availability of carbon.
Indicator minerals in kimberlite and lamproite include tiny
A.
emeralds.
B.
sapphires.
C.
amethysts.
