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Kelapa Kampit, Nam Salu, Yen Salu

Indonesia

Main commodities: Sn Zn Pb
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The Kelapa Kampit - Nam Salu stratabound tin deposit is on Belitung Island in Indonesia.

Belitung Island is roughly square in shape with dimensions of around 50 x 50 km. The north western quarter of the island is occupied by a Late Triassic granitic body, while quartz-monzonite occupies a strip along the south coast. Other smaller granodiorite, quartz-monzonite and granite bodies from 1 x 1 km to 10 x 2 km in size occur sporadically around the island. The remainder largely comprises an undifferentiated sequence of Permian sediments with a very small area of spilitic pillow lavas on the north coast adjacent to the main granite, and a 9 x 2 km gabbroic body to the east of Kelapa Kampit on the north eastern coast. Other lesser gabbros are found to the south. The sedimentary sequence strikes east-west and usually dips sub-vertically with few observable fold closures.

The Permian sequence is composed predominantly of quartz sandstones to quartzites with lesser inter-bedded siltstones and claystones. The sediments represent shallow water shelf deposits, exhibiting cross-bedding and scour and fill structures with minor slumping and possible ripple marks. It is reasonably massively bedded with few laminations. In places, sandstones and claystones are inter-bedded on a 1 to 2 m thick basis.

Within the Kelapa Kampit mine sequence, stratabound tin mineralisation has been recognised at eleven stratigraphic positions (although some may be fault repetitions) within a sequence of sandstone, claystone and cherts. The strike direction within the mine area is generally ESE-WNW with a variable dip to the south averaging 70°. The mineralised package is distributed over a length of around 3 km. However, individual ore grade lodes only occupy portions of this length, in general being 100 to 500 m in length. A few are longer, with the most extensive being the Yen Salu, which is known for more than 2 km. The sequence is cut by a series of NE-SW faults which carry mineralisation locally, but are of lesser economic importance. These faults also terminate many of the mineralised zones.

In general the mineralised units are only thin (less than 1, to a few metres wide), although the Nam Salu horizon is a 35 m thick unit of stilpnomelane-chlorite-(biotite)-phyllite which is exposed over a 3 km interval.   This horizon is characterised by semi-continuous 0.2 to 15 mm scale banding defined by varying iron content as magnetite, pyrrhotite, pyrite, ilmenite and siderite, averaging around 8% by volume. Other horizons have a similar mineralogy, with variations in the proportion of the various sulphides and magnetite. Some are also rich in base metals such as galena and sphalerite with local intersections of up to 10% Zn and 3% Pb over 2 to 10 m.

In the Kelapa Kampit pit a restricted 100 x 100 x 35 m shoot of 1 to 2% tin has been mined within the Nam Salu horizon, the mineralisation being symmetrically distributed on either side of an oblique fault cutting the horizon.   Tin is present as fine grained 2 to 200 micron cassiterite randomly distributed in the phyllosilicate matrix and in a number of post dissemination stages of fine veinlets with sulphides.

Historically the Kelapa Kampit hard rock mines have produced more than 25 000 tonnes of tin since 1906.

For detail see the reference(s) listed below.

The most recent source geological information used to prepare this summary was dated: 1990.    
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd.   Unauthorised copying, reproduction, storage or dissemination prohibited.


  References & Additional Information
   Selected References:
Schwartz M O, Surjono  1990 - The strata-bound Tin deposit Nam Salu, Kelapa Kampit, Indonesia: in    Econ. Geol.   v85 pp 76-98


Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge.   It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published.   While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo takes no responsibility what-so-ever for inaccurate or out of date data, information or interpretations.

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