Mineral Deposit Geology and Models Flashcards
_____ which occurs at the surface can be worked by cheap open pit methods.
Large, low-grade deposits
_____ will necessitate more expensive underground methods of extraction
Thin tabular vein deposits
_____, aided by the savings from bulk handling of large daily tonnages, has led to a trend towards the large scale mining of low grade orebodies
Open pitting
Ore bodies of _____ can be mined more cheaply than those of _____, particularly when they include barren zones
regular shape, irregular shape
For an open pit mine, the shape and attitude of an orebody will also determine ____
how much waste has to be removed during mining
if an orebody viewed in plan is longer in one direction than the other, we can designate this long dimension as its _____.
strike
The inclination of the orebody perpendicular to the strike.
dip
The longest dimension of the orebody.
axis
The _____ of the axis is measured in the vertical
plane ABC
plunge
Can be measured in any other plane, the usual choice being the plane containing the strike,
pitch or rake
if the orebody is fault-controlled then the _____ may be measured in the fault plane.
pitch
These bodies are extensive in two dimensions but have restricted development in their third dimension.
Tabular orebodies
Frequently pinch and swell out as they are followed up or down a stratigraphical sequence
Vein
Sometimes called fissure-veins
Veins
Can create difficulties during both exploration and mining often because only the swells are workable.
pitch-and-swell structure
