The lead-zinc ores of the Bou Beker- Touissit area in the Middle Atlas mountains, eastern Morocco, replace recrystallized Liassic dolomites at the base of a block-faulted Jurassic section which rests on Paleozoic basement rocks. The ore bodies are localized along subsidiary fractures and faults of the south boundary fault of the Bou Beker graben, which presumably constituted a channelway for mineralizing solutions originating at great depth. Two principal types of ores are present--a fine-grained crystalline aggregate of sphalerite with subordinate galena, and coarse crystalline galena which is preferentially distributed in the uppermost dolomites and probably represents a late stage of mineralization.

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