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The Platinum group elements (Pt-Pd-Os-Ir-Ru-Rh)
These are ring complexes several kilometers accross encased orogenic zone characterised by some units similar to those of Island arcs. No bedding is apparent in the field.Their age ranges from Devonian to Cretaceous. Their geochemistry (magma type) and metallogeny (PGE element distribution and type of metal) are largely unknown. The known mineralization associated with these complexes…
- Edisi
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- ISBN/ISSN
- 0216-0765
- Deskripsi Fisik
- 27p,.ill. 22 x 19 cm
- Judul Seri
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- No. Panggil
- PK No. 81
Previous epithermal gold mines in Indonesia
The known occurences are almost located in the Barisan Mountain area. Most deposit are hosted in Tertiary volcanics and are considered to be late in Tertiary in age A number of areas contain gold mineralization in quartz stringers in pre Tertiary metamorphic rocks. The older gold deposits tend to be more common in the northern part of Sumatera where placer are also more c…
- Edisi
- -
- ISBN/ISSN
- 0216-0765
- Deskripsi Fisik
- 32p,.ill. 22 x 19 cm
- Judul Seri
- -
- No. Panggil
- PK No. 80
World gold deposits A metallogenc quantitative classification perecentage of …
A notable feature of such deposts in eugeosynclinal rocks, is the spatial associati• on of auriferous deposits and those of the polymetallic sulphides ores although the deposits themselves occur at different stratigraphic levels. Such associations are exem• plified in the Archaean of Canada. Furthermore gold is often a by-product of the polymetallic sulphide ores and sul…
- Edisi
- -
- ISBN/ISSN
- 0216-0765
- Deskripsi Fisik
- 19p.,ill. 14 x 21 cm
- Judul Seri
- -
- No. Panggil
- PK No. 73
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