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MODES OF GOLD OCCURRENCES IN GA'ARA DEPRESSION, WESTERN DESERT, IRAQ | ||
| Iraqi Bulletin of Geology and Mining | ||
| Article 1, Volume 6, Issue 2, 2010, Pages 139-147 | ||
| Authors | ||
| Faraj H. Tobia; Mazin M. Mustafa | ||
| Abstract | ||
| This research deals with gold occurrences in the ferruginous sandstones and ironstones (massive and pisolitic) of the Ga'ara Formation (Permo – Carboniferous). The morphological features of the gold particles suggest that the gold occurrences are multisourced. The gold occurs in two modes namely: mechanical transportation of the gold grains associated with ferruginous sandstones, and chemical mobilization associated with the (massive and pisolitic) ironstones. The most significant primary gold source is the Precambrian Shield of Saudi Arabia after deep weathering and erosion under humid tropical conditions. The other possible source is the supergene ore deposits that are not far from the area. The majority of the gold is transported in a suspended form as scales and gold dust (first mode), or is transported in a colloidal form with the ferric hydroxides (second mode). | ||
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