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* Gold miner returns to London after 2015 delisting
* Aims to raise $400 mln from new shares
* Proceeds from existing shares to go to Kerimov family
* Provides test of Western appetite for Russian assets
By Polina Devitt
MOSCOW, June 5 (Reuters) - Russia's top gold producer Polyus will offer new and existing shares in a secondary share offering in both London and Moscow, it said on Monday, in a deal that will test investor appetite for Russian assets.
Polyus delisted from the London Stock Exchange in late 2015 after Western sanctions over Moscow's role in the Ukraine crisis began to bite for Russian companies. However it returns to London, buoyed by an 11 percent rise in global gold prices this year and by a separate $887 million deal to sell 10 percent of the company to a Chinese consortium led by Fosun International.
As part of its secondary share offering for 7 percent of the company's equity, Polyus expects to raise $400 million from the sale of new shares. Further proceeds from existing equity will go the company's controlling shareholder, the family of Russian tycoon Suleiman Kerimov.
The company, listed on the Moscow Exchange with a market capitalisation of $9.9 billion and a free float of 6.76 percent, plans to use the proceeds from the planned share sale to repay some of its debt and finance projects.
The Chinese deal had valued Polyus at $9 billion, or $70.6 per share, compared with 4,423 roubles ($78) per share at the market close on Friday. The shares were up 0.4 percent at 4,440 roubles on Monday.
Other large Russian companies will be watching the Polyus offering with interest, hoping to gauge the likelihood of a robust return of investors that took flight after Moscow annexed Crimea from Ukraine in 2014.
The first $500 million-plus offering on the Moscow market this year could be followed by an initial public offering (IPO) from En+ Group, which manages Russian tycoon Oleg Deripaska's aluminium and hydropower businesses, sources have told Reuters.
State shipping company Sovcomflot is also expected to launch an IPO before long.
Polyus, meanwhile, is looking for a successful share sale to boost funds after winning a licence in January for one of the world's biggest untapped gold deposits and as it prepares to start production at its large Natalka deposit in late 2017.
In a separate statement on Monday, Polyus raised its production forecast to 2.35-2.4 million troy ounces in 2018 and 2.8 million ounces in 2019, having previously forecast 2.7 million ounces by 2020. Total cash costs will remain below $400 an ounce, it added. ($1 = 56.6025 roubles) (Additional reporting by Katya Golubkova and Oksana Kobzeva; Editing by David Goodman)