Saudi Arabia plans to sign deals worth more than $50 billion in the oil, gas, industries and infrastructure sectors at an investment conference in Riyadh on Tuesday, a source familiar with the matter said. The deals will be signed with companies including Trafigura, Total ( TOTF.PA ), Hyundai ( 011760.KS ), Norinco ( 000065.SZ ), Schlumberger, Halliburton ( HAL.N ) and Baker Hughes ( BHGE.N ), the source said. The deals will include the establishment of a copper, zinc and lead smelter with Trafigura Group; a joint agreement to build an integrated petrochemical complex and downstream park in the second phase of the SATORP refinery, jointly held by Saudi Arabia’s Aramco and Total; and investments in retail gas stations also by Aramco and Total.