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Acid rock drainage ARD is produced by the oxidation of sulfide minerals chiefly iron pyrite or iron disulfide FeS2 . This is a natural chemical reaction which can proceed when minerals are exposed to air and water. Acidic drainage is found around the world both as a... Lees meer.

Rapport sur une excursion dans les steppes kirghyzs de la Siberie occidentale dans le territoire occupe par les mines et concessions de ci-devant S. N. Popoff ... par M. A. Gouroff ...Date de l edition originale. 1879Ce livre est la reproduction fidele d une oeuvr... Lees meer.

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Mines Inexploitees Retrait Des Concessions is een boek van Aguillon... Lees meer.

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Excerpt from Reports of the Scientific Commission of the Republic of France on the Guayape and Jalan River Concessions and on Six Mineral Zones. Also Statement of Ex-Inspector General of Mines State of Honduras Dear Sir. We have the honor to forward in this same enc... Lees meer.

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