UPDATE 3-Brazil's Lula to meet with miner Vale CEO

* Lula to meet with Vale CEO as tensions mount

* Brazil considering iron ore export tax

* Measure would hit mining giant Vale (Adds Lula, Vale comments, updates stock price)

By Raymond Colitt

BRASILIA, Oct 16 (Reuters) - Brazilian President Luiz Inacio Lula da Silva said on Friday he will meet the head of mining giant Vale next week amid tensions between the company and the government, which may slap an export tax on iron ore.

Vale (VALE.N: Quote, Profile, Research)(VALE5.SA: Quote, Profile, Research) has faced harsh criticism in recent months from government leaders, including Lula, for not investing enough in Brazil, fueling speculation he is seeking to force out the company's chief executive, Roger Agnelli.

Lula said Vale was preparing to announce another set of investments, without offering details, only days after the company unveiled more than $5 billion in new outlays in efforts to stave off the torrent of criticism.

"I'm going to meet with him on Monday in Sao Paulo, where he's going to present Vale projects -- they're important investments, I'll wait for him to announce them," Lula said during a televised address.

A Vale spokesman declined to comment on whether Agnelli would indeed meet with Lula or if the company was going to announce new investments.