DAY 3 Flashcards
What can be measured if there are two individuals located in different areas belonging to the same latitude of the Earth?
A. Circumference of the Earth
B. Diameter of the Sun
C. Radius of the Earth
D. None
A or C
Assuming that all dip values are taken correctly from a tilted sandstone bed, which among the following is the true dip?
a. 45 degrees
b. 42 degrees
c. 43.5 degrees
d. 44.5 degrees
e. cannot be determined
A
Calculate the thickness of a tilted bed having a due east strike and 45 degrees due south true dip and an exposed horizontal thickness of 10 meters.
10
Given strike and true dip of N50E, 40SE, find the apparent dip in vertical section trending S70E.
Given two apparent dips (i.e., (1) 55, N60E; (2) 65, N45E), calculate the true dip of the bed.
Calculate the thickness of a tilted bed having a due east strike and 45 due south true dip and an exposed horizontal thickness of 10 meters.
T or F. Pyrite transforms into marcasite at high temperature conditions (i.e., >400 degrees Celsius).
F. Marcasite is a polymorph of pyrite also known as white pyrite forms at near surface conditions.
T or F. Enargite and Luzonite are pseudomorphs.
F. Dimorph or polymorph
T or F. An ounce of lead is heavier than an ounce of gold.
F
T or F. The Clarke concentration of an element is equal to the cutoff grade of the element divided by its crustal abundance.
T
T or F. Nicolas Steno described mining techniques and used morphological classification of ore deposits in De Re Metallica
F. Georges Bauer (Father of Mineralogy)
T or F. Epithermal veins are formed at higher temperatures than hypothermal deposits.
F. Epithermal shows at shallow surfaces
T or F. A gas phase is present during formation of pneumatolytic
deposits
T
T or F. The melting point of ice in fluid inclusions increases as the salt content of the fluid increases.
F. More salts means ice melts faster
T or F. Silicification and silication are synonymous terms referring to the introduction of or replacement by silica.
F. Silicification - replacing silica
Silication - converting to silica
T or F. Drag ore is an indication of pre-ore faulting
F. Pre-ore means wala pang ore
Drag ore - crushed or broken part of the ore body in the fault zone
T or F. Ore reserves consist of measured and indicated reserves.
F. Indicate and measure are mineral resources
T or F. The average width of the veins is greater or equal the average width of the stope.
F. Only greater not equal
T or F. The sodium ion is usually the most abundant constituent of fluids in fluid inclusions
T.
A gold quartz vein has a strike length of 300 m and an average thickness of 1.5 m. What is the production rate from this vein?
– Assume density of quartz vein 2.6 g/cm3
– Assume production rate 50 vertical m/a
What is the optimal mine capacity for a reserve of 8 million t of
ore?
An iron ore mine produces crude ore with 55% Fe and a concentrate with 66% Fe at a 90% metal recovery. Calculate mass recovery factor.
A mine contains in situ ore grading 8% Pb. It produces a 65% Pb concentrate, with a recovery rate of 95%. Calculate the concentration factor.
Determine the recovery for the following data:
* Feed grade = 10 % Zn
* Concentrate grade = 54 % Zn
* Tailings grade = 0.5 % Zn
