ORE DEP (WEATHERING)

Question 1

Deposit restricted to ultramafic rocks of the various ophiolite belts where climatic conditons and phyriographic favor laterization processes

Answer 1

Laterites

Question 2

Division of laterite with:
?High Fe
?Low Ni, Co, Mg and Si

Answer 2

Limonite

Question 3

Divison of Laterite with:
?High Ni, Co, Mg
?Low Fe

Answer 3

Garnierite

Question 4

A-Type Nickel Laterite Ore which contains Ni-Bearing Silicates in weathered Rocks

Answer 4

Saprolite

Question 5

Ni Serpentine in which Mg»Ni, Fe

Answer 5

Garnierite

Question 6

Ni replaces Mg in Garnierite

Answer 6

Noumeite

Question 7

Ni replaces Fe in Garnierite

Answer 7

Nepouite

Question 8

Ni Bearing Smectite

Answer 8

Pimelite

Question 9

B-type Nickel Laterite in which Ni is adsorbed onto and included in geothites and other hydrous Fe Oxides

Answer 9

Laterite Ore

Question 10

Controls on Ni Laterite

Answer 10

?Stable Tropical Climate
?Broad Outcrops of UM rocks
?20 deg slope
?Plateu Topog w/ generates stable, slow subsruface water movement
?Time

Question 11

Example of Ni-Laterite in the Phi

Answer 11

Riotuba Palawan
Berong, Palawan
Taganito, Surigao del N (Taas)
Hinatuan, Surigao del S

Question 12

Al-rich laterite , high in Al2O low in SiO2 and Fe2O3 and forms when silica in aluminum bearing rocks (High felds) is washed away or leachd

Answer 12

Bauxite

Question 13

Three Hydroxides which combines to form Bauxite

Answer 13

Diaspore Alpha AlO (OH)
Boehmite Beta AlO (OH)
Gibbsite Al (OH)3

Question 14

favorable bedrocks for bauxite formation

Answer 14

Syenites and
Argilleaceous Carbonate rocks

Question 15

Other properties of Bauxite

Answer 15

Earthy and dull Laster can look like soil or clay
Reddishbrown, white, Tan to tan-yellow

Question 16

Carbonate Bauxites

Answer 16

Europe and Jamaica above carbonates

Question 17

Lateritic Bauxites

Answer 17

Tropical Countries above silicic rocks

Question 18

Whre is the zone of highest Al Content in Bauxites?

Answer 18

Below a ferruginous surface layers

Question 19

Weathering of Cu-Bearing mineralization wherein a small percentage of Cu can be leahed from Large volume or rock and can be redeposited as a higher grade deposit in a smaller volume of rocks provided that the conditions are favorable

Answer 19

Supergene Cu-Enrichment

Question 20

Favorable Conditions for Supergene Enrichment

Answer 20

?Protore is porous and permeable to meteoric water
?Protore contains abundant Pyrite to produce oxidixing acids - phyllic zones
?Protore contains ACID-Soluble ore metal bearing minerals
?Precipitative Envi - Arid Envi

Question 21

Examples of Supergene Enrichment of PCD in Ard Envi

Answer 21

Chiquimata
El Salvador

Question 22

Levels of Supergene Enrichment

Answer 22

OXIDIZED ZONE
1)Gossan - Hydrated Iron Oxides
2)Leached Zones - Hydroxyl Carbonates
3) Oxidized Zone - Cuprite, Crysocolla
-Water Table-
REDUCED ZONE
1)Seconary Sulfide Enrichments - Cpy, Covel, Born
2) Protore - Pyr + Chlcopyr