Epithermal Gold Deposits & Epitermal Altın Yatakları | Vol2

Posted on Ocak 12, 2022by with No comments

Epithermal gold deposits have alteration, geometric shapes. Alteration is a very important thing when searching for epithermal gold deposits. They have clay and silicic zones. We can find Antimuan minerals ıf they including gold and silver. Epithermal gold deposits can include Pb, Zn, and Cu minerals but these minerals tenor is very low (1/100).

Erosion size is an important thing for the field survey.

If there is no erosion in the field you can see:
-Silicic Zones
-Hydrothermal breccia

If there is an erosion in the field you can see:
-Carbonate massive vein or clay solution
-hydraulic breccia
-cryptocrystalline bands
- Quartz which has calcite

Mine deposits were classified by Lindgren. According to Lindgren, this classification has three-part. The first part is from surface to 1km depth. It's well known as epithermal. And the second part is Mezothermal ( to 3 km). The last piece is Hypothermal (to 15km).


After the Lindgren, mine deposits were classified as formation environments and wall rock types.

-Epithermal deposits with magmatic rocks
-Epithermal deposits with sedimentary rocks (Carlin Type)
-Epithermal deposits with ultramafic rocks

1. Magmatic rocks and epithermal deposits 
This activity occurs in convergent plate zones. The rock compound is calc-alkaline (Rich Ca). This field is controlled by a structural process.

2. Carbonate rocks and epithermal deposits (Sedimentary)
As, Sb, Hg, and TI are very common, and also Carlin-type deposits occur in this area. The Calcite dissolve where low-temperature carbonate rocks. Then Au and pyrite occur. Au/Ag rate is more than 1 and temperature is lower than 250°C.

3. Ultramafic rocks and epithermal deposits
These rocks have carbonate and silica. These materials are dissolved with a geothermal solution. And they take a name as Listwenit. Co, Ni, Hg and Au are prevalent with Listwenit.

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