MANGANESE

Question 1

A silver-gray, brittle metallic element used principally in making alloys,

Answer 1

Manganese (Mn)

Question 2

First distinguished as an element in 1774 by the Swedish chemist _______

Answer 2

Carl Wilhelm Scheele

Question 3

Mn was isolated in the same year, 1774, by ______

Answer 3

Johan Gottlieb Gahn

Question 4

The metal does not occur in the free state, except in meteors, but is widely distributed throughout
much of the earth’s crust in combination with other chemical elements, such as

Answer 4

Rhodochrosite, franklinite, hausmannite, braunite, rhodonite, and friends

Question 5

The principal ore of manganese
is

Answer 5

pyrolusite [ MnO2 ]

Question 6

Ores that contain from 5 -10 % manganese are called

Answer 6

Manganiferous ores

Question 7

Ores that have 10 – 35% manganese are called

Answer 7

Ferruginous manganese ore

Question 8

Ores with 35% or more manganese are called

Answer 8

Manganese ores

Question 9

Is the world’s leading producer of high-grade manganese ore

Answer 9

Ukraine

Question 10

Are abundant at the ocean floor in areas where oxidized sediments
are accumulating at rates of less than 7 meters per million years.

Answer 10

Pelagic ferromanganese nodules

Question 11

Most of the manganese deposits of commercial importance are confined in a belt between

Answer 11

45º north latitude and 25º south latitude

Question 12

During the war, all manganese mines were destroyed and it took quite a time to resume
operations. In ____, only two companies re-opened but they were able to export 3,322 tons of
manganese ore mined from _________, and _________.

Answer 12

1947; Busuanga, Bohol, and Masbate

Question 13

In 1950, eleven mines operated,
the biggest was the __________, in Anda and Guindulman, Bohol.

Answer 13

General Base Metals, Inc.

Question 14

a pink crystalline solid, is used in paints, varnish driers, and for dyeing cotton.

Answer 14

Manganese sulfate (MnSO4)

Question 15

High grade ____ is used in the manufacture of disinfectants.

Answer 15

pyrolusite

Question 16

Primary manganese deposits of volcanic-sedimentary origin are those deposits associated
with :

Answer 16

a) submarine volcanic rocks and chert ;
b) tuff and tuffaceous sedimentary rocks and some
chert ; and
c) chert only.

Question 17

Anda Peninsula , Bohol

Answer 17

• Primary sedimentary and epigenetic deposits and secondary(residual
• Volcanic rocks unconformably overlain by massive, poorly bedded, fossiliferous Miocene limestone
• 1.5 million DMT of ore with an average manganese content of 9.11 percent

Question 18

Madulag, Baler, Aurora

Answer 18

• Sedimentary
• Meta-volcanic and meta-sedimentary rocks
• “Middle oreody”, “Northern and Southern orebody”
• estimated geological reserves is 174,642 metric tons

Question 19

Coron , Busuanga Island, Palawan

Answer 19

• Primary sedimentary deposit
• Jordan Mining and Industrial Corporation
• metasedimentary rocks consisting of chert, jasper and quartzitic arenites
• total geologic reserve computed in different areas is 137,340 metric tons.

Question 20

Siquijor Island , Negros Oriental

Answer 20

• Residual type
• Kanglasog volcanics
• 117,447 MT with an average grade of 33.61% Mn

Question 21

Jiabong , Western Samar

Answer 21

• Sedimentary and residual deposit
• Upper Cretaceous limestone with minor interbeds of tuffaceous sandstone, shale, and chert