ERTH 308 FINAL EXAM UOFC EXAM
QUESTIONS AND ANSWERS 100% PASS
How much of the worlds Cu does Chile produce? - ANS 1/3
What is the avg concentration of Cu in the rock mined at Las Pelembres? - ANS 1%
How deep is the snow at Las Pelambres? - ANS 5m
What were some of the things in the hospital made out of copper? - ANS Bed rails, sinks, and
a stethoscope
What country controls the worlds largest reserves of rare earth elements? - ANS China (90%
is refined there)
What is one of the most widely used products that rare earths are necessry for? -
ANS Magnets
Separating rare earths from the rock they are in requires a huge amount of.... - ANS energy
All of these minerals are considered conflict minerals, due to their potential origin in the
Democratic Republic of Congo - ANS Tin, tantalum, tungsten and gold
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,Coltan stands for? - ANS columbite-tantalite mineral. It is a vital source for elements niobium
and tantalum, which are used to create capacitors for modern electronics like smartphones and
laptops.
What does tin (Sn) do in the phone? - ANS tin solders the circuit board
What does tantalum (Ta) do in the phone? - ANS tantalum stores electricity for its battery
What does tungsten (W) do in the phone? - ANS tungsten makes your phone vibrate
What does gold(Au) do in the phone? - ANS gold coats its wires
What percentage of the world's copper is produced by Chile? - ANS About a third
What is the average concentration of copper in the rock mined at Las Pelambres? - ANS 1%
How deep is the snow in winter at Las Pelambres? - ANS 5 meters
What are some items in hospitals made of copper? - ANS Bed rails, sink, stethoscope
What jobs are available at the US Borax mine? - ANS Chemist, geologist, engineer,
environmental scientist, millwright, electrician, equipment operator, shipping team, commercial
team, strategic planning, quality specialist
Where does 90% of the world's rare earth refining happen? - ANS China
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, What are magnets used for that require rare earth elements? - ANS One of the most widely
applicable products
What is required to separate rare earths from the rock? - ANS A huge amount of energy
What minerals are considered conflict minerals? - ANS Tin, tantalum, tungsten, and gold
What does coltan stand for? - ANS Columbite-tantalite mineral
What elements are vital sources from coltan? - ANS Niobium and tantalum
What does tin do in smartphones? - ANS Solders the circuit board
What does tantalum do in smartphones? - ANS Stores electricity for its battery
What does tungsten do in smartphones? - ANS Makes your phone vibrate
What does gold do in smartphones? - ANS Coats its wires
What is the pH range for acidic substances? - ANS 0-5.6
What is the pH of neutral substances? - ANS 7
What is the pH range for alkaline substances? - ANS 8-14
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
QUESTIONS AND ANSWERS 100% PASS
How much of the worlds Cu does Chile produce? - ANS 1/3
What is the avg concentration of Cu in the rock mined at Las Pelembres? - ANS 1%
How deep is the snow at Las Pelambres? - ANS 5m
What were some of the things in the hospital made out of copper? - ANS Bed rails, sinks, and
a stethoscope
What country controls the worlds largest reserves of rare earth elements? - ANS China (90%
is refined there)
What is one of the most widely used products that rare earths are necessry for? -
ANS Magnets
Separating rare earths from the rock they are in requires a huge amount of.... - ANS energy
All of these minerals are considered conflict minerals, due to their potential origin in the
Democratic Republic of Congo - ANS Tin, tantalum, tungsten and gold
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,Coltan stands for? - ANS columbite-tantalite mineral. It is a vital source for elements niobium
and tantalum, which are used to create capacitors for modern electronics like smartphones and
laptops.
What does tin (Sn) do in the phone? - ANS tin solders the circuit board
What does tantalum (Ta) do in the phone? - ANS tantalum stores electricity for its battery
What does tungsten (W) do in the phone? - ANS tungsten makes your phone vibrate
What does gold(Au) do in the phone? - ANS gold coats its wires
What percentage of the world's copper is produced by Chile? - ANS About a third
What is the average concentration of copper in the rock mined at Las Pelambres? - ANS 1%
How deep is the snow in winter at Las Pelambres? - ANS 5 meters
What are some items in hospitals made of copper? - ANS Bed rails, sink, stethoscope
What jobs are available at the US Borax mine? - ANS Chemist, geologist, engineer,
environmental scientist, millwright, electrician, equipment operator, shipping team, commercial
team, strategic planning, quality specialist
Where does 90% of the world's rare earth refining happen? - ANS China
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, What are magnets used for that require rare earth elements? - ANS One of the most widely
applicable products
What is required to separate rare earths from the rock? - ANS A huge amount of energy
What minerals are considered conflict minerals? - ANS Tin, tantalum, tungsten, and gold
What does coltan stand for? - ANS Columbite-tantalite mineral
What elements are vital sources from coltan? - ANS Niobium and tantalum
What does tin do in smartphones? - ANS Solders the circuit board
What does tantalum do in smartphones? - ANS Stores electricity for its battery
What does tungsten do in smartphones? - ANS Makes your phone vibrate
What does gold do in smartphones? - ANS Coats its wires
What is the pH range for acidic substances? - ANS 0-5.6
What is the pH of neutral substances? - ANS 7
What is the pH range for alkaline substances? - ANS 8-14
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
