UPDATE 4-Sinosteel in hostile bid for Australia's Midwest

(Recasts lead, updates shares to close)

By James Regan and Denny Thomas

SYDNEY, March 14 (Reuters) - Sinosteel Corp offered A$954 million ($902 million) for prospector Midwest Corp MIS.AX to lock up future iron ore supplies, marking the first hostile bid by a Chinese firm in Australia's booming mining sector.

Sinosteel, a steel commodities trader, already owns 19.9 percent of Midwest and is a partner in its Mt Weld prospect, one of five deposits it is looking to exploit.

"Miners are realising that the cost of mining in China is high and that overseas it is relatively cheaper," said Liu Yikang, Deputy Secretary General of China Mining Association.

The offer valued Midwest at $1.1 billion or A$5.60 a share, a 35 percent premium to Midwest's Thursday close. The stock jumped 31 percent to A$5.43 on Friday, still short of the offer price, suggesting there may not be competing suitors.

Sinosteel dropped a friendly buyout proposal for Midwest in January after Malaysia's David Law, a Midwest director who holds a 13.3 percent stake, said he would not accept A$5.60 a share.

"We have made this offer directly to Midwest shareholders as we firmly believe it provides (them) with the opportunity to realise certain value in cash for their shares at a significant premium to historical trading levels," Sinosteel President Tianwen Huang said in a statement.

Sinosteel's offer hinges on securing at least 50.1 percent of Midwest's shares. It said it already had clearance to proceed from Australia's Foreign Investment Review Board.

Analysts said to expect more muscle-flexing to acquire Australia mining houses as China's hunger for imported raw materials intensifies.

"This is the first time a Chinese partner has actually gone in to take the whole company and maybe it's an omen of things to come in the near future," said DJ Carmichael & Co analyst James Wilson.

TOP STEEL MAKER

China has emerged as the world's top steel maker with a hunger for imported ore to feed its mills. Demand has helped drive iron ore prices sharply higher, with some mills paying double what they did last year.

"Iron ore prices are rising fast and it's in the best interest of Chinese companies to get into companies like Midwest as soon as possible," Wilson said.

Miners estimate that China accounts for more than 90 percent of global growth in the iron ore market

At present, almost half of China's demand for iron ore is met from its own mines or from India, where much of it is bought at high prices on the spot market.