XXV. Questions (T or F)

Question 1

Pyrite transforms into marcasite at high temperature conditions (>400°C).

Answer 1

False

Pyrite does not transform into marcasite at high temperatures. In fact, marcasite is less stable and typically forms at lower temperatures than pyrite.

Question 2

Enargite and Luzonite are pseudomorphs.

Answer 2

True

Question 3

An ounce of lead is heavier than an ounce of gold.

Answer 3

False

An ounce of gold is heavier than an ounce of lead because gold has a higher density.

Question 4

The Clarke concentration of an element is equal to the cut-off grade of the element divided by its crustal abundance.

Answer 4

True

Question 5

Nicolas Steno described mining techniques and used morphological classification of ore deposits in De Re Metallica.

Answer 5

False

Nicolas Steno contributed to stratigraphy, not mining techniques. Georgius Agricola wrote De Re Metallica.

Question 6

Epithermal veins are formed at higher temperatures than hypothermal deposits.

Answer 6

False

Hypothermal deposits form at higher temperatures than epithermal veins.

Question 7

A gas phase is present during formation of pneumatolytic deposits.

Answer 7

True

Question 8

The melting point of ice in fluid inclusions increases as the salt content of the fluid increases.

Answer 8

False

As salt content increases, the melting point of ice decreases (freezing point depression).

Question 9

Silicification and silication are synonymous terms referring to the introduction of or replacement by silica.

Answer 9

True

Question 10

Drag ore is an indication of pre-ore faulting.

Answer 10

True

Question 11

Demonstrated ore reserves consist of measured and indicated reserves.

Answer 11

True

Question 12

The average width of the veins is greater or equal the average width of the stope.

Answer 12

True

Question 13

The nugget effect of the variogram function is determined by the intercept of the variogram i.e., distance (h)=0.

Answer 13

True

Question 14

Larger tubes produce larger diameter rock cores and require more drill power to drive them.

Answer 14

True

Question 15

The sodium ion is usually the most abundant constituent of fluids in fluid inclusions.

Answer 15

True

Question 16

50-20 degree celsius; Moderate Pressure

Answer 16

Epithermal

Question 17

200-300 degree celsius; High Pressure

Answer 17

Mesothermal

Question 18

300-500 degree celsius; Very High Pressure

Answer 18

Hypothermal

Question 19

Hole: 48 mm Core: 27 mm

Answer 19

Size: AQ

Question 20

Hole: 96 mm Core: 63.5 mm

Answer 20

Size: HQ

Question 20

Hole: 75.7 mm Core: 47.6 mm

Answer 20

Size: NQ

Question 20

Hole: 60 mm Core: 36.5 mm

Answer 20

Size: BQ

Question 20

Hole: 96 mm Core: 61.1 mm

Answer 20

Size: HQ3

Question 21

Hole: 122.6 mm Core: 85 mm

Answer 21

Size: PQ

Question 22

Hole: 122.6 mm Core: 83 mm

Answer 22

Size: PQ3

Question 23

Hole: 75.7 mm Core: 43.5 mm

Answer 23

Size: CHD 76

Question 24

Hole: 101.3 mm Core: 63.5 mm

Answer 24

Size: CHD 101

Question 25

Hole: 134 mm Core: 85 mm

Answer 25

Size: CHD 134