Gold and silver metals are obtained from a variety of different types of rock ores. Most people think of gold nuggets constitute the source of the gold. But the reality is very few gold derived from the nugget. Nearly all newly mined gold comes from ores from natural hard rock mining, fine gold grains, even microscopic particles.
Gold widely found in nature, although it is one of rare metals. It often happens gold which known as the native metal encased within a mineral such as quartz. And historically gold the most productive, occur in the vein deposits. Currently these widespread deposits give much of the world gold ore.
The element gold ores in nature occurs even mainly in the form of native gold, In various gold ores, original gold mineral content commonly occurs, fine mineral particles and small contained within sulfide minerals such as pyrite.
Iron pyrites a very common mineral associated with gold, but it also serves as a reducing agent. Therefore, if gold is found enclosed in pyrite, it is always free gold and not as some kind of gold sulfide. Gold also sometimes in chalcopyrite, galena and arsenopyrite and stibnite, but not as one is found in such quantities as may be found in pyrite. Other minerals such as sphalerite, pyrhotite, magnetite and hematite sometimes carry little amounts of gold as well.
Gold also comes as Telluride as Calaverit. Common gangue in gold ores include quartz, fluorite, calcite and pyrite, but many others can be found in smaller amounts
Gold Ore Minerals :
The most prominent is pure gold – The most common the native gold contains a Little amount of silver, copper, platinum, etc.
The most prominent is pure gold – The most common the native gold contains a Little amount of silver, copper, platinum, etc.
Telluride minerals are the most common minerals that significant gold in their makeup. These include:
- Petzite (Ag, Au) 2, Te,
- Hessit (Ag2Te)
- sylvanite (Au, Ag) Te2
- Calaverit (Au, Ag) Te2
- Krennerit (Ag2Te, Au2Te3)
- Nagyagit ( Au2, Pbi4, Sb 3, TE7, S7).
The gold containing sulphides and tellurides, are primary formation from gold ore, although auriferous chalcopyrite could be formed by secondary enrichment process.
Native gold can occur in the primary, secondary enrichment or oxidized zones. The tellurides, which are usually associated with pyrite, are widely used, though not so often, but not always recognized; in fact, some of the miners they are mistaken for sulfides
Native gold can occur in the primary, secondary enrichment or oxidized zones. The tellurides, which are usually associated with pyrite, are widely used, though not so often, but not always recognized; in fact, some of the miners they are mistaken for sulfides
1. Of these can be cataloged as quartzose.
This means that the gangue mineral is acid, that is, quartz and fluorite which may be very abundant or the other gangue minerals of the alkaline soil group. Not infrequently, it seems varies pyrite and limited amounts of chalcopyrite and galena within quartz quantities. These are free milling ores.
Through a free milling ore it is meant that the rock does not require roasting before the gold can be recovered therefrom. Dry ore is the term that is often used for this category.
Through a free milling ore it is meant that the rock does not require roasting before the gold can be recovered therefrom. Dry ore is the term that is often used for this category.
2. Copper ores containing gold ore mineral
These are widely used in the United States and much of the chalcopyrite is gold bearing. This auriferous copper ores are particularly abundant in Colorado, Utah, Montana and British Columbia. They are also in Gold Hill, North Carolina and in Canada to Newfoundland.
3. The class of gold ore is auriferous lead ores.
The proportion of lead in these rocks is large and the gold content is often low. They are refractory ores such as copper ore. The refractory ore is a meant requires roasting before extraction processing. The heavy sulphides as copper, lead and antimony require this method of treatment, that is the condition of the gold in the mineral will not allow of its immediate capture with most recovery systems.
4. gold ores comprises the gold-telluride group
The gold telluride ores occur accompanied by other tellurides with silver, lead and antimony or as native gold accompanied by other tellurides. These ores are often sent directly for the treatment of smelters.
The gold telluride ores occur accompanied by other tellurides with silver, lead and antimony or as native gold accompanied by other tellurides. These ores are often sent directly for the treatment of smelters.
5. Type of disseminated ore.
They are often low in grade, but present in very large numbers. They fill large fracture and fault zones or replace certain geologic horizons. They are the result of the circulation of large amounts of heated water deep underground.
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