ORE DEP (CLASTIC SEDS)

Question 1

Deposits realted to Clastic Sediments

Answer 1

?Sanstone type Uranium
?Placer Deposits
?Qtz-Pebble Conglo Au-U - Witswatersrand deposit, SA

Question 2

?Stratabound in Arkosic (Felds-Rich) Sed Rocks
?Devonian-Tertiary Age
?Enriched by “LATERAL SECRETION” - deposition of Uranium minerals from circulating Groundwater

Answer 2

Sandstone-Type Uranium

Question 3

How much of the worlds resources is represented by Sed Uranium?

Answer 3

40%

Question 4

Common Ore Minerals

Answer 4

Uraninite and Coffinite

Question 5

Types of Sandstone Type Uranium

Answer 5

?Roll Front Type-U
?Salt Wash Type-U
?Humate Type-U

Question 6

A deposit created by EROSION and/or SEDIMENTATION containing paticle of some valuable minerals

Answer 6

Placer Deposits

Question 7

Most exploited deposits of this type?

Answer 7

Cenozoic

Question 8

Two Types of Placer Accdng to Age

Answer 8

1) Modern - Actively Forming
2) Fossil - Buried by Younger Rocks

Question 9

Types of Placer Concentrations

Answer 9

1) Eluvial - Hill Slopes
2) Alluvial - Fans
3) Fluvial - Streams
4) Marine - beach sands
5) Lacustrine - Lakes
6) Glacial - Tills

Question 10

Type of placer-forming minerals which are more resistant to chemical and mechanical erosion

Answer 10

Resistate

Question 11

Type of placer-forming minerals with high specific Gravities

Answer 11

Heavy minerals

Question 12

Types of Resistates Mienrasl

Answer 12

1) Non Reactive - Inert
2) Maleable - Bend rather than break
3) High Hardness

Question 13

Inert Oxide Mienrals

Answer 13

Cassiterite
Chromite
Rutile
Magnetie
Ilmenite

Question 14

Inert Silicates

Answer 14

Zircon

Question 15

Inert Tunsgates

Answer 15

Wolframite

Question 16

Maleable Minerals

Answer 16

Gold
Platinum
Bismuth

Question 17

Hard Minerals

Answer 17

Diamond
Corundum
Garnet

Question 18

Most valuable placer commodity
Sg = 19.3
Chemically stable
Usually alloyed with Ag (Electrum)
Purer in Smaller Grains

Answer 18

Free Au