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MROP - MIDTERMS > GOLD AND SILVER > Flashcards

GOLD AND SILVER Flashcards

1
Q

The unit used in weighing gold is the ______

A

troy ounce (1 troy ounce = 31.1g)

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2
Q

The naturally occurring gold-silver alloy is called

A

Electrum

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3
Q

Green gold used in jewelry contains

A

copper and silver

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4
Q

White gold contains

A

zinc and nickel

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5
Q

Gold’s purity is often assessed in _____, with _____ gold representing pure gold

A

Karats; 24-Karat

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6
Q

It is harder than gold but softer than copper.

A

Silver

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7
Q

Silver ranks about ____ among elements in terms of natural abundance in the earth’s crust.

A

66th

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8
Q

_____ for tableware and other solid-silver objects is 92.5 percent silver and 7.5 percent copper.

A

Sterling silver

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9
Q

are used in medicine as antiseptics
and bactericides

A

Colloidal silver

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10
Q

a silver-protein compound, is a local antiseptic for the eyes, ears, nose, and throat

A

Argyrol

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11
Q

Are used in emulsions for photographic plates, film, and paper.

A

Silver-halide salts (bromide, chloride, iodide)

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12
Q

The arrival of the ________ by the end of the ________saw the
beginning of systematic exploration work and the introduction of modern methods
of mining and ore dressing.

A

Americans; 19th century

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13
Q

By 1938, the ______ had already produced a total of
PHP189,000,000 worth of gold, a figure equivalent to 2,700,000 ounces of gold

A

Baguio District

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14
Q

The gold mines in operation in the Baguio District were

A

Benguet Consolidated, Itogon, Balatoc, Antamok Goldfields, Baguio Gold, Benguet Exploration, Big Wedge, Demonstration and Cal Horr.

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15
Q

Estimates of gold ore reserves in the Philippines, as of 1996 amounted to ___________ with a weighted average grade ranging from 0.05 – 20.00 % g Au /
MT.

A

162.8 million metric tons

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16
Q

Two major magmatic arcs, the ___________ and _________,
are the most prolific gold producers in the country

A

Western Luzon and Eastern Philippine arcs

17
Q

The recognized gold province and gold districts include:

A
  • Gold province is the Eastern Mindanao Gold Province (three gold districts, namely, Surigao Gold District, Central Gold District, and
    Masara Gold District)
  • Gold districts are
    (1) Baguio-Mankayan Gold district ; (2) Camarines Norte Gold District; and
    (3) Masbate Gold district.
18
Q

one of the oldest and richest gold mining areas in the country, producing well in excess of 800 tons of gold, more than any other
gold-field in the Asia-western Pacific region

A

Baguio-Mankayan Gold District

19
Q

One of the most dense in terms of number of reported deposits and prospects per unit area.

A

Camarines Norte Gold District

20
Q

Is the site of the world class Aroroy gold deposit, which accounted for 12% of pre-World War II (1939-40) gold production in the
Philippines

A

Masbate Gold District

21
Q

Philippine gold deposits may be genetically divided into two groups,
namely:

A

Primary-hypogene Au-Ag deposits, and Secondary-supergene
deposits.

22
Q

Primary-hypogene gold-silver deposits include various genetic subtypes such as:

A

Epithermal/ mesothermal, skarn or contact metasomatic, and copper by products

23
Q

Secondary-supergene deposits include

A

Placer gold and gossanous gold
deposits

24
Q

Are epigenetic bodies formed at
temperatures ranging from 180° - 300° C and are predominantly hosted by volcanics, plutonics, wackes and volcaniclastics which are generally of andesitic
to dacitic composition.

A

Epithermal gold deposits

25
Q

Economic contact metasomatic deposits that have already been developed are

A

Thanksgiving Mine (Benguet Exploration Inc.) and Siana Mine (Surigao Consolidated)

26
Q

Export markets for gold are mainly

A

Japan, South Korea and United Kingdom.

27
Q

For silver, the country’s major markets are

A

Japan, United Kingdom, China and Korea

28
Q

______, _________, and______ methods
are employed to recover gold from run-of-mine ore.

A

Carbon-in-pulp (CIP), Carbon-in-pulp (CIP), and Heap leaching

29
Q

The CIP/CIL method lowers capital cost by almost __ as it eliminates the use of filtration and
decantation units.

A

50%

MROP - MIDTERMS (7 decks)

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