Fertilizer maker Mosaic Co (MOS.N) said on Tuesday that Saudi Arabia's firm Ma'aden would acquire the US-based company's stake in a phosphate production joint venture by issuing shares worth about $1.5 billion. Ma'aden will issue about 111 million shares to buy the 25% stake Mosaic owns in Ma'aden Wa'ad Al Shamal Phosphate Co, a joint venture between Mosaic, Ma'aden and Saudi Basic Industries (2010.SE), opens new tab Corp.