The Campo de Gibraltar Unit is a prism accreted from terrigenous deposits formed in the Oligocene.
2.
On top of the marine deposits, terrigenous deposits such as sandstone, conglomerate, siltstone and mudstone overly.
3.
Host rocks for the upper parts of the ore zones are the Upper Cretaceous sediments and the volcanic rocks in the richer lower Jurassic terrigenous deposit.
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