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White Gold EarthCache

This cache has been archived.

eniel: Archived due to security reasons!
Thanks for all visits!

Hidden : 12/17/2007
1 out of 5
2.5 out of 5

Size: Size:   not chosen (not chosen)

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Geocache Description:

Kaolin, also called  china clay, is a  soft white clay  (aluminosilicate) that is an essential ingredient in the manufacture of china and porcelain and is widely used in the making of paper, rubber, paint, refractories, plastics, sanitary wares, fiberglass, adhesives and many other products.

Kaolin is named after the hill in China (Kao-ling) from which it was mined for centuries. Samples of kaolin were first sent to Europe by a French Jesuit missionary around 1700.

This minning site, with an area of 200 hectares of sedimentary china clay, is located near Barqueiros - Barcelos.  This deposit is essentially composed by Kaolinitic sand layers. Then in the western area of the deposit there is a level of quartzitic pebbles that decreases in thickness and finishes in the eastern area.


The kaolinitic levels go from extremely high degrees of whiteness to a shade of yellow. The extraction method is through excavation and is than transported from the sites to the storage or the washing area. This is the most suitable method to allow a good selection of the material.

The china clay is extremely fine and the silica sand of round grain. The sand from the whitest levels have a extremely low percentage of iron.


The quartizic peblles are white, but when wet show spots and grooves which makes a chameleon pebble. These pebbles exist in several sizes.

This mine have millions of tons of raw material reserves.


Your mission to claim this earthcache is one of the following options:

Option a: Take a picture with your GPS and kaolin in the background and post with your log and send me an email with the kaolin (aluminosilicate) chemical formula.

Option b: Send me an email with the red text found at N41º 28.957’ W008º 44.149’ and N41º 29.020’ W008º 44.182’ and the kaolin (aluminosilicate) chemical formula.

Additional Hints (No hints available.)