Skarn mineralisation, which often contains magnetite, can also be detected though the ore minerals themselves would be non-magnetic.
32.
Successive envelopes of hydrothermal alteration typically enclose a core of disseminated ore minerals in often stockwork-forming hairline fractures and veins.
33.
In most forest ecosystems, sulfate is derived mostly from the atmosphere; weathering of ore minerals and evaporites also contribute some sulfur.
34.
These particles are then separated to remove gangue, thereafter followed by a process of physical liberation of the ore minerals from the rock.
35.
"' Violarite "'( supergene sulfide mineral associated with the weathering and oxidation of primary pentlandite nickel sulfide ore minerals.
36.
Galena, the most important lead ore mineral and a frequent source of silver, was discovered in the district of Tullah in 1892.
37.
The advantages of HPAL plants are that they are not as selective toward the type of ore minerals, grades and nature of mineralisation.
38.
Primary ore minerals are uraninite and pitchblende, which occur as cavity fills and coatings on quartz grains within permeable sandstone breccias within the pipe.
39.
In the oxidized zone, ore minerals include native silver and argentite have been replaced by cerargyrite, iodobromite, bromyrite, embolite, iodyrite.
40.
But the ore grades were too low, the ore mineral particles too small, and the copper was largely in sulfides instead of native copper.
