Abstract

In the high Moulouya watershed, the exploitation of the Zeida mine between 1972 and 1985 generated huge masses (millions of tons) of mining waste (Pb, Zn). This activity created large pits currently filled with stagnant water which are in permanent contact with remaining ore deposit.The interaction of rainwater with rocks and minerals lead to the enrichment of Water Lake with heavy metals.An inverse geochemical modelling carried out on water sampled in ZA and ZL1 lakes made it possible to highlight the chemical reactions occurring between rainwater and ore deposit and which would control the chemistry of these waters.

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